Patent Application
20200246617
There is a desire in the industry for a technology that enables an initial provisioning and a refilling of a medical device, such as non-invasive electrical stimulation devices. However, such technology does not exist. Therefore, this disclosure enables such technology.
In some embodiments, a system comprises: a processor; a memory coupled to the processor, wherein the memory stores a first content; a medical device coupled to the processor; and a reader coupled to the processor, wherein the reader is configured to read a second content from a storage medium other than the memory such that the processor switches the medical device from a first mode to a second mode based on the first content corresponding to the second content.
In some embodiments, an output device is coupled to the processor and the processor is configured to instruct the output device to interface with the storage medium based on the processor switching the medical device from the first mode to the second mode such that the storage medium is modified.
In some embodiments, the first mode of the medical device is a deactivated mode and the second mode is an activated mode. The activated mode is configured for a defined time period or a defined number of doses such that the medical device will stop working after a defined time period of a defined number of doses. This allows the device to be used, for example, by patients after having been prescribed a medical treatment by a physician or other caregiver. The physician may prescribe a defined number of doses or a defined period of time for the patient to use the medical device and receive treatment. When that period or number of doses has been completed, the device is switched back to the deactivated mode so that the patient will no longer receive treatment from the device.
In some embodiments, the storage medium is card-shaped and the reader is configured to read the second content from the storage medium via an RFID technique. The first content preferably corresponds to the second content based on at least one of a value or a format.
In some embodiments, the reader is configured to read the second content from the storage medium optically. The second content may be a barcode, a QR code or the like and the reader may be configured to read the second content from the storage medium electromagnetically.
In some embodiments, the medical device comprises a nerve stimulation device for modulating one or more nerves within a patient's body to treat a disease, disorder or condition, or the symptoms of a disease, disorder or condition. In these embodiments, the medical device comprises a housing having a contact surface and an electrode coupled to the pulse generator within the housing. The device can also include a power supply that may be located within the housing, or coupled to the power supply through wire or wireless connections. The pulse generator can be configured to transmit the electrical impulse from the electrode(s) through the contact surface transcutaneously and non-invasively through an outer skin surface of a patient such that the electrical impulse is sufficient to modulate a nerve, such as the vagus nerve, within the patient. The electrical impulse is sufficient to cause the vagus nerve to generate an action potential sufficient to treat a medical condition, disease or disorder within the patient.
In some embodiments, a method comprises: causing, via a processor, a memory to store a first content; causing, via the processor, a reader to read a second content from a storage medium other than the memory; and causing, via the processor, a medical device to switch from a first mode to a second mode based on the first content corresponding to the second content.
In some embodiments, a method comprises: obtaining, via a point-of-sale (POS) terminal (e.g., a camera), a first content uniquely associated with a medical device; retrieving, via the POS terminal, a second content from a record of a database; writing, via the POS terminal, the first content into the record such that the first content is associated with the second content in the record; and taking an action, via the POS terminal, with respect to the medical device responsive to the writing. The record preferably includes a field containing a patient identifier such that the first content is associated with the second content and the patient identifier in the record. The action may involve physically moving the medical device.
In some embodiments, a method comprises: retrieving, via a point-of-sale (POS) terminal, a first content and a second content from a record of a database, wherein the first content is uniquely associated with a medical device; and programming, via the POS terminal, a storage medium based on the first content and the second content such that the medical device can be switched from a first mode to a second mode based on the storage medium being in proximity of the medical device.
In some embodiments, a method comprises: causing, via a processor, a reader to read a content from a storage medium; causing, via the processor, a medical device to be switched from a first mode to a second mode; tracking, via the processor, a use of the medical device in the second mode; causing, via the processor, the medical device to be switched from the second mode to the first mode in response to a threshold being satisfied based on the use.
In some embodiments, a method for treating a disease or disorder in a patient comprises applying energy transcutaneously through an outer skin surface of the patient to generate an electrical impulse at or near a selected nerve, such as the vagus nerve, within the patient. The electrical impulse is sufficient to treat the disorder or at least treat some of the symptoms of such disorder. A processor coupled to the medical device causes a memory to store a first content and a reader to read a second content from a storage medium. The medical device is configured to switch from a first mode to a second mode based on the first content corresponding to the second content. In this manner, the medical device may be “filled” with an initial number of doses or an active time period for a patient. The medical device will automatically become deactivated when the patient has completed the prescribed number of doses or time period.
In some embodiments, the medical device can be capable of being “refilled” with an additional number of doses or an additional amount of active time by switching the device back to the first or activated mode. This allows the physician or caregiver to control the level of treatment that a patient receives with the medical device.
In some embodiments, a contact surface of a housing on a handheld device is positioned in contact with or near an outer skin surface of a neck of the patient and the electric current is transmitted transcutaneously and non-invasively through the outer skin surface of the neck of the patient to generate an electrical impulse at or near a selected nerve, such as the vagus nerve, within the patient. The housing comprises an energy source for generating an electric current. However, the energy source may be located remotely to the housing in certain embodiments.
In some embodiments, the medical device is configured to treat autoimmune conditions, disorders or diseases that include, but are not limited to, Alzheimer's disease, Parkinson's disease, multiple sclerosis, Rheumatoid arthritis, Sjôgren's syndrome, temporal arteritis, Type 2 diabetes, Addison's disease, amyloidosis, Celiac disease, fibromyalgia, Graves disease, psoriasis, pernicious anemia (PA), peripheral neuropathy, lupus, Crohn's disease and the like. In these embodiments, the device generates one or more electrical impulses sufficient to activate one or more sympathetic fibers in the splenic nerve which causes the release of a sufficient amount of norepinephrine into a spleen of the patient, causing the release of acetylcholine. The acetylcholine is released activates one or more alpha 7 nicotinic Ach receptors on macrophages in the spleen to block transcription factors that promote inflammation in the patient. In other embodiments, the electrical impulse(s) is sufficient to inhibit and/or block the release of pro-inflammatory cytokines, such as TNF-alpha.
In some embodiments, the electrical impulse(s) is sufficient to increase the anti-inflammatory competence of certain cytokines to thereby offset or reduce the effect of pro-inflammatory cytokines.
In some embodiments, a system of treating an autoimmune disease or disorder in a patient comprises a housing having a contact surface positionable against an outer skin surface of a neck of the patient and a power supply coupled to the housing and configured to transmit, via the contact surface, an electric current transcutaneously and non-invasively through the outer skin surface of the neck of the patient. The electric current is sufficient to generate an electrical impulse at or near a selected nerve within the patient. The housing comprises a pulse generator coupled to the power supply and configured to modulate the electric current such that the electrical impulse is sufficient to inhibit inflammation and treat the autoimmune disease or disorder.
In some embodiments, a method for treating symptoms of a metabolic disease or disorder, such as type 2 diabetes, in a patient comprises positioning a contact surface of a housing in contact with an outer skin surface of a neck of the patient and transmitting, via the contact surface, an electric current transcutaneously and non-invasively through the outer skin surface of the neck of the patient to generate an electrical impulse at or near a selected nerve within the patient. The method further comprises modulating the electric current such that the electrical impulse is sufficient to inhibit inflammation and treat the symptoms of the metabolic disease or disorder.
In some embodiments, methods and devices can be used for an invasive or non-invasive treatment of autoimmune diseases and disorders, utilizing an energy source that transmits energy invasively or non-invasively to nervous tissue. In particular, some of the devices can transmit energy to, or in close proximity to, a vagus nerve of the patient, in order to temporarily stimulate, block and/or modulate electrophysiological signals in that nerve. The autoimmune conditions, disorders or diseases that can be treated include Alzheimer's disease, Parkinson's disease, multiple sclerosis, Rheumatoid arthritis, Sjôgren's syndrome, temporal arteritis, Type 2 diabetes, Addison's disease, amyloidosis, Celiac disease, fibromyalgia, Graves disease, psoriasis, pernicious anemia (PA), peripheral neuropathy, lupus, Crohn's disease, or others. An even more complete list of autoimmune diseases or disorders that may be treated can be found on an American Autoimmune Related Diseases Association website (aarda.org), the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein.
In some embodiments, a method for treating an autoimmune disorder in a patient comprises applying energy transcutaneously through an outer skin surface of the patient to generate an electrical impulse at or near a selected nerve, such as the vagus nerve, within the patient. The electrical impulse is sufficient to inhibit inflammation in the patient and treat the autoimmune disorder or at least treat some of the symptoms of such disorder.
In some embodiments, a contact surface of a housing on a handheld device is positioned in contact with or near an outer skin surface of a neck of the patient and the electric current is transmitted transcutaneously and invasively or non-invasively through the outer skin surface of the neck of the patient to generate an electrical impulse at or near a selected nerve, such as the vagus nerve, within the patient. The housing can comprise an energy source for generating an electric current. However, the energy source may be located remotely to the housing.
In some embodiments, the electrical impulse is sufficient to activate a sympathetic fiber in a splenic nerve which causes the release of a sufficient amount of norepinephrine into a spleen of the patient, causing the release of acetylcholine. The release of acetylcholine activates an alpha 7 nicotinic Ach receptor on a macrophage in the spleen to block transcription factors that promote inflammation in the patient.
In some embodiments, the electrical impulse is sufficient to inhibit and/or block the release of pro-inflammatory cytokines, such as TNF-alpha.
In some embodiments, the electrical impulse is sufficient to increase the anti-inflammatory competence of certain cytokines to thereby offset or reduce the effect of pro-inflammatory cytokines.
In some embodiments, a system of treating an autoimmune disease or disorder in a patient comprises a housing having a contact surface positionable against an outer skin surface of a neck of the patient and a power supply coupled to the housing and configured to transmit, via the contact surface, an electric current transcutaneously and non-invasively through the outer skin surface of the neck of the patient. The electric current is sufficient to generate an electrical impulse at or near a selected nerve within the patient. The housing further comprises a pulse generator coupled to the power supply and configured to modulate the electric current such that the electrical impulse is sufficient to inhibit inflammation and treat the autoimmune disease or disorder.
In some embodiments, a method for treating symptoms of type 2 diabetes in a patient comprises positioning a contact surface of a housing in contact with an outer skin surface of a neck of the patient and transmitting, via the contact surface, an electric current transcutaneously and non-invasively through the outer skin surface of the neck of the patient to generate an electrical impulse at or near a selected nerve within the patient. The method further comprises modulating the electric current such that the electrical impulse is sufficient to inhibit inflammation and treat the symptoms of the type 2 diabetes.
Various technologies for preventing, diagnosing, monitoring, ameliorating, or treating medical conditions, diseases, or disorders, such as autoimmune and metabolic diseases and disorders are more completely described in the following detailed description, with reference to the drawings provided herewith, and in claims appended hereto. Other aspects, features, advantages, etc. will become apparent to one skilled in the art when the description is taken in conjunction with the accompanying drawings.
Hereby, all issued patents, published patent applications, and non-patent publications that are mentioned in this specification are herein incorporated by reference in their entirety for all purposes as if copied and pasted herein, to the same extent as if each individual issued patent, published patent application, or non-patent publication were specifically and individually indicated to be incorporated by reference and copied and pasted into this disclosure.
Generally, this disclosure discloses a system that includes a medical device, such as a neurostimulator, and an input device, such as a reader, where the medical device is associated with a first content, such as in a one-to-one correspondence. The input device is configured to obtain a second content from a storage medium, such as a card, and then enable the medical device to be switched from a first mode, such as a deactivated mode, to a second mode, such as an activated mode, based on the first content corresponding to the second content, such as logically. Note though that this disclosure is now described more fully with reference to the set of accompanying illustrative drawings, in which example embodiments of this disclosure are shown. This disclosure can be embodied in many different forms and should not be construed as necessarily being limited to the example embodiments disclosed herein. Rather, the example embodiments are provided so that this disclosure is thorough and complete, and fully conveys various concepts of this disclosure to those skilled in a relevant art.
For example, this disclose can relate to delivery of energy impulses (and/or fields) to bodily tissues for therapeutic purposes. Some embodiments can relate to devices and methods for treating medical conditions, such as autoimmune diseases and disorders, where the patient uses the devices and methods as self-treatment, without the direct assistance of a healthcare professional. The energy impulses (and/or fields) that are used to treat those conditions comprise electrical and/or electromagnetic energy, can be delivered invasively or non-invasively to the patient, particularly to a vagus nerve of the patient.
Some limited use of electrical stimulation for treatment of medical conditions may have occurred. One successful application of modern understanding of the electrophysiological relationship between muscle and nerves is a cardiac pacemaker. Although origins of the cardiac pacemaker extend back into the 1800's, it was not until 1950 that the first practical, albeit external and bulky, pacemaker was developed. The first truly functional, wearable pacemaker appeared in 1957, and in 1960, the first fully implantable pacemaker was developed.
Around this time, it was also found that electrical leads could be connected to the heart through veins, which eliminated the need to open the chest cavity and attach the lead to the heart wall. In 1975, the introduction of the lithium-iodide battery prolonged the battery life of a pacemaker from a few months to more than a decade. The modern pacemaker can treat a variety of different signaling pathologies in the cardiac muscle, and can serve as a defibrillator as well (see U.S. Pat. No. 6,738,667 to DENO, et al., the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein). Because the leads are implanted within the patient, the pacemaker is an example of an implantable medical device.
Another such example is electrical stimulation of the brain with implanted electrodes (e.g. deep brain stimulation), which has been approved for use in the treatment of various conditions, including pain and movement disorders such as essential tremor and Parkinson's disease [Joel S. PERLMUTTER and Jonathan W. Mink. Deep brain stimulation. Annu. Rev. Neurosci 29 (2006):229-257 the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein)].
Another application of electrical stimulation of nerves is the treatment of radiating pain in the lower extremities by stimulating the sacral nerve roots at the bottom of the spinal cord [Paul F. WHITE, Shitong Li and Jen W. Chiu. Electroanalgesia: Its Role in Acute and Chronic Pain Management. Anesth Analg 92(2001):505-513; patent U.S. Pat. No. 6,871,099, entitled Fully implantable microstimulator for spinal cord stimulation as a therapy for chronic pain, to WHITEHURST, et al, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein)].
A form of electrical (or mechanical, thermal, acoustical, photonic, vibratory) stimulation that may be relevant to this disclosure can include invasive or non-invasive nerve stimulation, such as vagus nerve stimulation (VNS, also known as vagal nerve stimulation). It was developed initially for the treatment of partial onset epilepsy and was subsequently developed for the treatment of depression and other disorders. The left vagus nerve is ordinarily stimulated at a location within the neck by first surgically implanting an electrode there and then connecting the electrode to an electrical stimulator [U.S. Pat. No. 4,702,254 entitled Neurocybernetic prosthesis, to ZABARA the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; U.S. Pat. No. 6,341,236 entitled Vagal nerve stimulation techniques for treatment of epileptic seizures, to OSORIO et al, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; U.S. Pat. No. 5,299,569 entitled Treatment of neuropsychiatric disorders by nerve stimulation, to WERNICKE et al, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; G. C. ALBERT, C. M. Cook, F. S. Prato, A. W. Thomas. Deep brain stimulation, vagal nerve stimulation and transcranial stimulation: An overview of stimulation parameters and neurotransmitter release. Neuroscience and Biobehavioral Reviews 33 (2009):1042-1060, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; GROVES DA, Brown V J. Vagal nerve stimulation: a review of its applications and potential mechanisms that mediate its clinical effects. Neurosci Biobehav Rev 29(2005):493-500, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; Reese TERRY, Jr. Vagus nerve stimulation: a proven therapy for treatment of epilepsy strives to improve efficacy and expand applications. Conf Proc IEEE Eng Med Biol Soc. 2009, 2009:4631-4634, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; Timothy B. MAPSTONE. Vagus nerve stimulation: current concepts. Neurosurg Focus 25 (3, 2008):E9, pp. 1-4, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; ANDREWS, R. J. Neuromodulation. I. Techniques-deep brain stimulation, vagus nerve stimulation, and transcranial magnetic stimulation. Ann. N. Y. Acad. Sci. 993(2003):1-13, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; LABINER, D. M., Ahern, G. L. Vagus nerve stimulation therapy in depression and epilepsy: therapeutic parameter settings. Acta. Neurol. Scand. 115(2007):23-33, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein].
In some embodiments, many such therapeutic applications of electrical stimulation involve the surgical implantation of electrodes within a patient. In contrast, some devices used for the procedures that are disclosed herein do not involve surgery, i.e., they are not implantable medical devices. Instead, some of the present devices and methods stimulate nerves by transmitting energy to nerves and tissue non-invasively. A medical procedure can understood as being non-invasive when no break in the skin (or other surface of the body, such as a wound bed) is created through use of the method, and when there is no contact with an internal body cavity beyond a body orifice (e.g., beyond the mouth or beyond the external auditory meatus of the ear). In some ways, such non-invasive procedures can be distinguished from some invasive procedures (including minimally invasive procedures) in that the invasive procedures insert a substance or device into or through the skin (or other surface of the body, such as a wound bed) or into an internal body cavity beyond a body orifice.
For example, transcutaneous electrical stimulation of a nerve can be non-invasive because it involves attaching electrodes to the skin, or otherwise stimulating at or beyond the surface of the skin or using a form-fitting conductive garment, without breaking the skin [Thierry KELLER and Andreas Kuhn. Electrodes for transcutaneous (surface) electrical stimulation. Journal of Automatic Control, University of Belgrade 18(2, 2008):35-45, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; Mark R. PRAUSNITZ. The effects of electric current applied to skin: A review for transdermal drug delivery. Advanced Drug Delivery Reviews 18 (1996) 395-425, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein]. In contrast, percutaneous electrical stimulation of a nerve can be minimally invasive because it involves the introduction of an electrode under the skin, via needle-puncture of the skin.
Another form of non-invasive electrical stimulation is magnetic stimulation. It involves the induction, by a time-varying magnetic field, of electrical fields and current within tissue, in accordance with Faraday's law of induction. Magnetic stimulation can be non-invasive because the magnetic field is produced by passing a time-varying current through a coil positioned outside the body. An electric field is induced at a distance, causing electric current to flow within electrically conducting bodily tissue. The electrical circuits for magnetic stimulators can be generally complex and expensive and use a high current impulse generator that may produce discharge currents of 5,000 amps or more, which is passed through the stimulator coil to produce a magnetic pulse. Some principles of electrical nerve stimulation using a magnetic stimulator, along with descriptions of medical applications of magnetic stimulation, are reviewed in: Chris HOVEY and Reza Jalinous, The Guide to Magnetic Stimulation, The Magstim Company Ltd, Spring Gardens, Whitland, Carmarthenshire, SA34 0HR, United Kingdom, 2006, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein. In contrast, the magnetic stimulators that are disclosed herein are relatively simpler devices that can use considerably smaller currents within the stimulator coils. Accordingly, they are intended to satisfy a need for simple-to-use and less expensive non-invasive magnetic stimulation devices.
Some advantages of some of such non-invasive medical methods and devices relative to comparable invasive procedures are as follows. The patient may be more psychologically prepared to experience a procedure that is non-invasive and may therefore be more cooperative, resulting in a better outcome. Non-invasive procedures may avoid damage of biological tissues, such as that due to bleeding, infection, skin or internal organ injury, blood vessel injury, and vein or lung blood clotting. Non-invasive procedures can be generally measurably painless and may be performed without some of the dangers and costs of surgery. They are ordinarily performed even without the need for local anesthesia. Less training may be required for use of non-invasive procedures by medical professionals. In view of the reduced risk ordinarily associated with non-invasive procedures, some such procedures may be suitable for use by the patient or family members at home or by first-responders at home or at a workplace. Furthermore, the cost of non-invasive procedures may be significantly reduced relative to comparable invasive procedures.
In co-pending, commonly assigned patent applications, the Applicant disclosed some noninvasive electrical vagus nerve stimulation devices, which are adapted, and for certain applications improved, in the present disclosure [application Ser. No. 13/183,765 Ser. No. and Publication US2011/0276112, entitled Devices and methods for non-invasive capacitive electrical stimulation and their use for vagus nerve stimulation on the neck of a patient, to SIMON et al, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein: application Ser. No. 12/964,050 and Publication No. US2011/0125203, entitled Magnetic Stimulation Devices and Methods of Therapy, to SIMON et al, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; and other co-pending commonly assigned applications that are cited therein, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein]. At least some of the present disclosure elaborates on the electrical stimulation device, rather than the magnetic stimulation device that has similar functionality, with the understanding that unless it is otherwise indicated, the elaboration could apply to either the electrical or the magnetic nerve stimulation device. Because some properties of some of the earlier devices have already been disclosed, the present disclosure focuses on what is new with respect to the earlier disclosures.
The patient can apply the stimulator without the benefit of having a trained healthcare provider nearby. An advantage of the self-stimulation therapy is that it can be administered more or less immediately when symptoms occur, rather than having to visit the healthcare provider at a clinic or emergency room. A need for such a visit would only compound the aggravation that the patient is already experiencing. Another advantage of the self-stimulation therapy is the convenience of providing the therapy in the patient's home or workplace, which eliminates scheduling difficulties, for example, when the nerve stimulation is being administered for prophylactic reasons at odd hours of the day. Furthermore, the cost of the treatment may be reduced by not requiring the involvement of a trained healthcare provider.
The present disclosure discloses methods and devices for the non-invasive treatment of diseases and disorders, utilizing an energy source that transmits energy non-invasively to nervous tissue. In particular, the devices can transmit energy to, or in close proximity to, a nerve of the patient, such as the vagus nerve, in order to temporarily stimulate, block and/or modulate electrophysiological signals in that nerve. In some embodiments, some electrodes applied to the skin of the patient generate currents within the tissue of the patient. This may enable production and application of the electrical impulses so as to interact with the signals of one or more nerves, in order to achieve the therapeutic result. Some of the disclosure is directed specifically to treatment of a patient by stimulation in or around a vagus nerve, with devices positioned non-invasively on or near a patient's neck. However, other medical devices, techniques, and modalities of prevention, diagnosis, monitoring, amelioration, or treatment of various medical conditions, disorders, or diseases are disclosed herein as well.
For example, some systems and methods can be configured to prevent, diagnose, monitor, ameliorate, or treat a neurological condition, such as epilepsy, headache/migraine, whether primary or secondary, whether cluster or tension, neuralgia, seizures, vertigo, dizziness, concussion, aneurysm, palsy, Parkinson's disease, Alzheimer's disease, or others, as understood to skilled artisans and which are only omitted here for brevity. For example, some systems and methods can be configured to prevent, diagnose, monitor, ameliorate, or treat a neurodegenerative disease, such as Alzheimer's disease, Parkinson's disease, multiple sclerosis, postoperative cognitive dysfunction, and postoperative delirium, or others, as understood to skilled artisans and which are only omitted here for brevity. For example, some systems and methods can be configured to prevent, diagnose, monitor, ameliorate, or treat an inflammatory disease or disorder, such as Alzheimer's disease, ankylosing spondylitis, arthritis (osteoarthritis, rheumatoid arthritis (RA), Sjôgren's syndrome, temporal arteritis, Type 2 diabetes, psoriatic arthritis, asthma, atherosclerosis, Crohn's disease, colitis, dermatitis, diverticulitis, fibromyalgia, hepatitis, irritable bowel syndrome (IBS), systemic lupus erythematous (SLE), nephritis, fibromyalgia, Celiac disease, Parkinson's disease, ulcerative colitis, chronic peptic ulcer, tuberculosis, periodontitis, sinusitis, hepatitis, Graves disease, psoriasis, pernicious anemia (PA), peripheral neuropathy, lupus or others, as understood to skilled artisans and which are only omitted here for brevity. For example, some systems and methods can be configured to prevent, diagnose, monitor, ameliorate, or treat a gastrointestinal condition, such as ileus, irritable bowel syndrome, Crohn's disease, ulcerative colitis, diverticulitis, gastroesophageal reflux disease, or others, as understood to skilled artisans and which are only omitted here for brevity. For example, some systems and methods can be configured to prevent, diagnose, monitor, ameliorate, or treat a bronchial disorder, such as asthma, bronchitis, pneumonia, or others, as understood to skilled artisans and which are only omitted here for brevity. For example, some systems and methods can be configured to prevent, diagnose, monitor, ameliorate, or treat a coronary artery disease, heart attack, arrhythmia, cardiomyopathy, or others, as understood to skilled artisans and which are only omitted here for brevity. For example, some systems and methods can be configured to prevent, diagnose, monitor, ameliorate, or treat a urinary disorder, such as urinary incontinence, urinalysis, overactive bladder, or others, as understood to skilled artisans and which are only omitted here for brevity. For example, some systems and methods can be configured to prevent, diagnose, monitor, ameliorate, or treat eat a cancer, such as bladder cancer, breast cancer, prostate cancer, lung cancer, colon or rectal cancer, skin cancer, thyroid cancer, brain cancer, leukemia, liver cancer, lymphoma, pancreatic cancer, or others, as understood to skilled artisans and which are only omitted here for brevity. For example, some systems and methods can be configured to prevent, diagnose, monitor, ameliorate, or treat a metabolic disorder, such as diabetes (type 1, type 2, or gestational), Gaucher's disease, sick cell anemia, cystic fibrosis, hemochromatosis, or others, as understood to skilled artisans and which are only omitted here for brevity.
In some embodiments, various brain and brainstem structures are preferentially modulated by the stimulation. Some of these structures are described in sections of the disclosure that follow, along with the rationale for modulating their activity as a prophylaxis or treatment of autoimmune diseases, such as Alzheimer's disease, Parkinson's disease, multiple sclerosis, Rheumatoid arthritis, Sjôgren's syndrome, temporal arteritis, Type 2 diabetes, Addison's disease, amyloidosis, Celiac disease, fibromyalgia, Graves disease, psoriasis, pernicious anemia (PA), peripheral neuropathy, lupus, Crohn's disease and the like.
As a preliminary matter, we first describe the vagus nerve itself and its most proximal connections, which are relevant to the disclosure below of the electrical waveforms that may be used to perform some of the stimulation. A fact that electrical stimulation of a vagus nerve can be used to treat many disorders may be understood as follows. The vagus nerve is composed of motor and sensory fibers. The vagus nerve leaves the cranium, passes down the neck within the carotid sheath to the root of the neck, then passes to the chest and abdomen, where it contributes to the innervation of the viscera. A human vagus nerve (tenth cranial nerve, paired left and right) comprises of over 100,000 nerve fibers (axons), mostly organized into groups. The groups are contained within fascicles of varying sizes, which branch and converge along the nerve. Under normal physiological conditions, each fiber conducts electrical impulses only in one direction, which is defined to be the orthodromic direction, and which is opposite the antidromic direction. However, external electrical stimulation of the nerve may produce action potentials that propagate in orthodromic and antidromic directions. Besides efferent output fibers that convey signals to the various organs in the body from the central nervous system, the vagus nerve conveys sensory (afferent) information about the state of the body's organs back to the central nervous system. Some 80-90% of the nerve fibers in the vagus nerve are afferent (sensory) nerves, communicating the state of the viscera to the central nervous system.
The largest nerve fibers within a left or right vagus nerve are approximately 20 μm in diameter and are heavily myelinated, whereas only the smallest nerve fibers of less than about 1 μm in diameter are completely unmyelinated. When the distal part of a nerve is electrically stimulated, a compound action potential may be recorded by an electrode located more proximally. A compound action potential contains several peaks or waves of activity that represent the summated response of multiple fibers having similar conduction velocities. The waves in a compound action potential represent different types of nerve fibers that are classified into corresponding functional categories, with approximate diameters as follows: A-alpha fibers (afferent or efferent fibers, 12-20 μm diameter), A-beta fibers (afferent or efferent fibers, 5-12 μm), A-gamma fibers (efferent fibers, 3-7 μm), A-delta fibers (afferent fibers, 2-5 μm), B fibers (1-3 μm) and C fibers (unmyelinated, 0.4-1.2 μm). The diameters of group A and group B fibers include the thickness of the myelin sheaths.
The vagus (or vagal) afferent nerve fibers arise from cell bodies located in the vagal sensory ganglia, which take the form of swellings near the base of the skull. Vagal afferents traverse the brainstem in the solitary tract, with some eighty percent of the terminating synapses being located in the nucleus of the tractus solitarius (or nucleus tractus solitarii, nucleus tractus solitarius, or NTS). The NTS projects to a wide variety of structures in the central nervous system, such as the amygdala, raphe nuclei, periaqueductal gray, nucleus paragigantocellurlais, olfactory tubercule, locus ceruleus, nucleus ambiguus and the hypothalamus. The NTS also projects to the parabrachial nucleus, which in turn projects to the hypothalamus, the thalamus, the amygdala, the anterior insula, and infralimbic cortex, lateral prefrontal cortex, and other cortical regions [JEAN A. The nucleus tractus solitarius: neuroanatomic, neurochemical and functional aspects. Arch Int Physiol Biochim Biophys 99(5, 1991):A3-A52 the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein]. Thus, stimulation of vagal afferents can modulate the activity of many structures of the brain and brainstem through these projections.
With regard to vagal efferent nerve fibers, two vagal components have evolved in the brainstem to regulate peripheral parasympathetic functions. The dorsal vagal complex, consisting of the dorsal motor nucleus and its connections controls parasympathetic function primarily below the level of the diaphragm, while the ventral vagal complex, comprised of nucleus ambiguus and nucleus retrofacial, controls functions primarily above the diaphragm in organs such as the heart, thymus and lungs, as well as other glands and tissues of the neck and upper chest, and specialized muscles such as those of the esophageal complex. For example, the cell bodies for the preganglionic parasympathetic vagal neurons that innervate the heart reside in the nucleus ambiguus, which is relevant to potential cardiovascular side effects that may be produced by vagus nerve stimulation.
The vagus efferent fibers innervate parasympathetic ganglionic neurons that are located in or adjacent to each target organ. The vagal parasympathetic tone resulting from the activity of these fibers is balanced reflexively in part by sympathetic innervations. Consequently, electrical stimulation of a vagus nerve may result not only in modulation of parasympathetic activity in postganglionic nerve fibers, but also a reflex modulation of sympathetic activity. The ability of a vagus nerve to bring about widespread changes in autonomic activity, either directly through modulation of vagal efferent nerves, or indirectly via activation of brainstem and brain functions that are brought about by electrical stimulation of vagal afferent nerves, accounts for the fact that vagus nerve stimulation can treat many different medical conditions in many end organs. Selective treatment of particular conditions is possible because the parameters of the electrical stimulation (e.g. frequency, amplitude, pulse width, etc.) may selectively activate or modulate the activity of particular afferent or efferent A, B, and/or C fibers that result in a particular physiological response in each individual.
The electrodes used to stimulate a vagus nerve can be implanted about the nerve during open neck surgery. For many patients, this may be done with an objective of implanting permanent electrodes to treat epilepsy, depression, or other conditions [Arun Paul AMAR, Michael L. Levy, Charles Y. Liu and Michael L. J. Apuzzo. Chapter 50. Vagus nerve stimulation. pp. 625-638, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein. In: Elliot S. Krames, P. Hunber Peckham, Ali R. Rezai, eds. Neuromodulation. London: Academic Press, 2009, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; KIRSE DJ, Werle A H, Murphy J V, Eyen T P, Bruegger D E, Hornig G W, Torkelson R D. Vagus nerve stimulator implantation in children. Arch Otolaryngol Head Neck Surg 128(11, 2002):1263-1268, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein]. In that case, the electrode can be a spiral electrode, although other designs may be used as well [U.S. Pat. No. 4,979,511, entitled Strain relief tether for implantable electrode, to TERRY, Jr., the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; U.S. Pat. No. 5,095,905, entitled Implantable neural electrode, to KLEPINSKI, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein]. In other patients, a vagus nerve can be electrically stimulated during an open-neck thyroid surgery in order to confirm that the nerve has not been accidentally damaged during the surgery. In that case, a vagus nerve in the neck is surgically exposed, and a temporary stimulation electrode is clipped about the nerve [SCHNEIDER R, Randolph G W, Sekulla C, Phelan E, Thanh P N, Bucher M, Machens A, Dralle H, Lorenz K. Continuous intraoperative vagus nerve stimulation for identification of imminent recurrent laryngeal nerve injury. Head Neck. 2012 Nov. 20. doi: 10.1002/hed.23187 (Epub ahead of print, pp. 1-8), the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein].
It is also possible to electrically stimulate a vagus nerve using a minimally invasive surgical approach, namely percutaneous nerve stimulation. In that procedure, a pair of electrodes (an active and a return electrode) are introduced through the skin of a patient's neck to the vicinity of a vagus nerve, and wires connected to the electrodes extend out of the patient's skin to a pulse generator [Publication number US20100241188, entitled Percutaneous electrical treatment of tissue, to J. P. ERRICO et al., the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; SEPULVEDA P, Bohill G, Hoffmann T J. Treatment of asthmatic bronchoconstriction by percutaneous low voltage vagal nerve stimulation: case report. Internet J Asthma Allergy Immunol 7(2009):e1 (pp1-6), the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; MINER, J. R., Lewis, L. M., Mosnaim, G. S., Varon, J., Theodoro, D. Hoffman, T. J. Feasibility of percutaneous vagus nerve stimulation for the treatment of acute asthma exacerbations. Acad Emerg Med 2012; 19: 421-429, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein].
Percutaneous nerve stimulation procedures has been somewhat described primarily for the treatment of pain, but not for a vagus nerve, which is ordinarily not considered to produce pain and which presents special challenges [HUNTOON M A, Hoelzer B C, Burgher A H, Hurdle M F, Huntoon E A. Feasibility of ultrasound-guided percutaneous placement of peripheral nerve stimulation electrodes and anchoring during simulated movement: part two, upper extremity. Reg Anesth Pain Med 33(6, 2008):558-565, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; CHAN I, Brown A R, Park K, Winfree C J. Ultrasound-guided, percutaneous peripheral nerve stimulation: technical note. Neurosurgery 67(3 Suppl Operative, 2010):ons136-139, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; MONTI E. Peripheral nerve stimulation: a percutaneous minimally invasive approach. Neuromodulation 7(3, 2004):193-196, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; Konstantin V SLAVIN. Peripheral nerve stimulation for neuropathic pain. US Neurology 7(2, 2011):144-148, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein].
In some embodiments, a stimulation device is introduced through a percutaneous penetration in the patient to a target location within, adjacent to, or in close proximity with, the carotid sheath that contains the vagus nerve. Once in position, electrical impulses are applied through the electrodes of the stimulation device to one or more selected nerves (e.g., vagus nerve or one of its branches) to stimulate, block or otherwise modulate the nerve(s) and treat the patient's condition or a symptom of that condition. For some conditions, the treatment may be acute, meaning that the electrical impulse immediately begins to interact with one or more nerves to produce a response in the patient. In some cases, the electrical impulse will produce a response in the nerve(s) to improve the patient's condition or symptom in less than 3 hours, preferably less than 1 hour and more preferably less than 15 minutes. For other conditions, intermittently scheduled or as-needed stimulation of the nerve may produce improvements in the patient over the course of several hours, days, weeks, months or years. A more complete description of a suitable percutaneous procedure for vagal nerve stimulation can be found in commonly assigned, co-pending US Patent Application titled “Percutaneous Electrical Treatment of Tissue”, filed Apr. 13, 2009 (Ser. No. 12/422,483), the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein.
In some embodiments, a time-varying magnetic field, originating and confined to the outside of a patient, generates an electromagnetic field and/or induces eddy currents within tissue of the patient. In some embodiments, electrodes applied to the skin of the patient generate currents within the tissue of the patient. In some embodiments, an objective may include an ability to produce and apply the electrical impulses so as to interact with the signals of one or more nerves, in order to prevent or avert a stroke and/or transient ischemic attack, to ameliorate or limit the effects of an acute stroke or transient ischemic attack, and/or to rehabilitate a stroke patient.
Some of the disclosure is directed specifically to treatment of a patient by electromagnetic stimulation in or around a vagus nerve, with devices positioned non-invasively on or near a patient's neck. However, it will also be appreciated that some the devices and methods can be applied to other tissues and nerves of the body, including but not limited to other parasympathetic nerves, sympathetic nerves, spinal or cranial nerves. As recognized by those having skill in the art, the methods should be carefully evaluated prior to use in patients known to have preexisting cardiac issues. In addition, it will be recognized that some of the treatment paradigms can be used with a variety of different vagal nerve stimulators, including implantable and/or percutaneous stimulation devices, such as the ones described herein.
In some embodiments, broadly speaking, the Applicant has determined that there are several, such as three, components to the effects of nVNS on the brain. For example, the strongest effect occurs during the two minute stimulation and results in significant changes in brain function that can be clearly seen as acute changes in autonomic function (e.g. measured using pupillometry, heart rate variability, galvanic skin response, or evoked potential) and activation and inhibition of various brain regions as shown in fMRI imaging studies. For example, the second effect, of moderate intensity, lasts for 15 to 180 minutes after stimulation. Animal studies have shown changes in neurotransmitter levels in various parts of the brain that persist for several hours. For example, the third effect, of mild intensity, lasts up to 8 hours and is responsible for the long lasting alleviation of symptoms seen clinically and, for example, in animal models of migraine headache and autoimmune diseases, such as Sjôgren's syndrome and Rheumatoid arthritis or RA.
Thus, depending on the medical indication, whether it is a chronic or acute usage, such as treatment, and the natural history of the disease, different usage, such as treatment, protocols may be used. In particular, the Applicant has discovered that it is not necessary to “continuously stimulate” the vagus nerve (or to in order to provide clinically efficacious benefits to patients with certain disorders. In some embodiments, a term “continuously stimulate” can be understood to mean stimulation that follows a certain On/Off pattern continuously 24 hours/day. For example, some implantable vagal nerve stimulators “continuously stimulate” the vagus nerve with a pattern of 30 seconds ON/5 minutes OFF (or the like) for 24 hours/day and seven days/week. The Applicant has determined that this continuous stimulation is not necessary to provide the desired clinical benefit for many disorders. For example, in the treatment of acute migraine attacks, the treatment paradigm may comprise two minutes of stimulation at the onset of pain, followed by another two-minute stimulation 15 minutes later. For epilepsy, three 2-minute stimulations three times per day appear to be optimal. Sometimes, multiple consecutive, two minute stimulations are required. Thus, the initial treatment protocol corresponds to what may be optimum for the population of patients at large for a given condition. However, the treatment may then be modified on an individualized basis, depending on the response of each particular patient.
In some embodiments, there may be several interventions. For example, there may be three types of interventions involving stimulation of a vagus nerve: prophylactic, acute and compensatory (rehabilitative). Among these, the acute treatment involves the fewest administrations of vagus nerve stimulations, which begin upon the appearance of symptoms. It is intended primarily to enlist and engage the autonomic nervous system to inhibit excitatory neurotransmissions that accompany the symptoms. The prophylactic treatment resembles the acute treatment in the sense that it is administered as though acute symptoms had just occurred (even though they have not) and is repeated at regular intervals, as though the symptoms were reoccurring (even though they are not). The rehabilitative or compensatory treatments, on the other hand, seek to promote long-term adjustments in the central nervous system, compensating for deficiencies that arose as the result of the patient's disease by making new neural circuits.
In some embodiments, a vagus nerve stimulation treatment is conducted for continuous period of thirty seconds to five minutes, such about 90 seconds to about three minutes or about two minutes (each defined as a single dose) or others, each individually inclusive between thirty seconds to five minutes. After a dose has been completed, the therapy is stopped for a period of time (depending on the treatment as described below). For prophylactic treatments, such as a treatment to reduce systemic inflammation in Sjôgren's syndrome or treatments to reduce inflammation in certain locations of the body, such as the joints in Rheumatoid Arthritis, the therapy can comprise multiple doses/day over a period of time that may last from one week to a number of years. In some embodiments, a treatment comprises multiple doses at predetermined times during the day and/or at predetermined intervals throughout the day. In some embodiments, a treatment comprises least one of the following: (1) 3 doses/day at predetermined intervals or times; (2) two doses, either consecutively, or separated by 5 min at predetermined intervals or times, preferably two or three times/day; (3) 3 doses, either consecutively or separated by 5 min again at predetermined intervals or times, such as 2 or 3 times/day; or (4) 1-3 doses, either consecutively or separated by 5 min, 4-6 times per day. Initiation of a treatment may begin, for example, when pain or loss of mobility from inflammation occurs, or in a risk factor reduction program it may be performed throughout the day beginning after the patient arises in the morning.
In some embodiments, each treatment session comprises 1-3 doses administered to the patient either consecutively or separated by 5 minutes. The treatment sessions are administered every 15, 30, 60 or 120 minutes during the day such that the patient could receive 2 doses every hour throughout a 24-hour day.
In some embodiments, for some disorders, the time of day can be more important than the time interval between treatments. For example, the locus coeruleus has periods of time during a 24-hour day wherein it has inactive periods and active periods. Typically, the inactive periods can occur in the late afternoon or in the middle of the night when the patient is asleep. It is during the inactive periods that the levels of inhibitory neurotransmitters in the brain that are generated by the locus coeruleus are reduced. This may have an impact on certain disorders. For example, patients suffering from migraines or cluster headaches often receive these headaches after an inactive period of the locus coeruleus. For these types of disorders, the prophylactic treatment is optimal during the inactive periods such that the amounts of inhibitory neurotransmitters in the brain can remain at a higher enough level to mitigate or abort an acute attack of the disorder.
In these embodiments, the prophylactic treatment may comprise multiple doses/day timed for periods of inactivity of the locus coeruleus. In some embodiments, a treatment comprises one or more doses administered 2-3 times per day or 2-3 “treatment sessions” per day. The treatment sessions preferably occur during the late afternoon or late evening, in the middle of the night and again in the morning when the patient wakes up. In some embodiments, each treatment session comprises 1-4 doses, preferably 2-3 doses, with each dose lasting for about 90 seconds to about three minutes.
For other or some disorders, the intervals between treatment sessions may be the most important as the Applicant has determined that stimulation of the vagus nerve can have a prolonged effect on the inhibitor neurotransmitters levels in the brain, e.g., at least one hour, up to 3 hours and sometimes up to 8 hours. In some embodiments, a treatment comprises one or more doses (i.e., treatment sessions) administered at intervals during a 24-hour period. In some embodiments, there are 1-5 such treatment sessions, preferably 2-4 treatment sessions. Each treatment session preferably comprises 1-3 doses, each lasting between about 60 seconds to about three minutes, preferably about 90 seconds to about 150 seconds, more preferably about 2 minutes.
For an acute treatment, such as treatment of acute pain associated with an autoimmune disorder, a therapy may comprise at least one of: (1) 1 dose at the onset of symptoms; (2) 1 dose at the onset of symptoms, followed by another dose at 5-15 min; or (3) 1 dose every 15 minutes to 1 hour at the onset of symptoms until the acute attack has been mitigated or aborted. In these embodiments, each dose can last between about 60 seconds to about three minutes, preferably about 90 seconds to about 150 seconds, more preferably about 2 minutes.
For long term treatment of an acute insult such as one that occurs during the treatment of systemic autoimmune diseases, a therapy may include at least one of: (1) 3 treatments/day; (2) 2 treatments, either consecutively or separated by 5 min, 3×/day; (3) 3 treatments, either consecutively or separated by 5 min, 2×/day; (4) 2 or 3 treatments, either consecutively or separated by 5 min, up to 10×/day; or (5) 1, 2 or 3 treatments, either consecutively or separated by 5 min, every 15, 30, 60 or 120 min.
For some, many, most, or all of the treatments listed above, one may alternate treatment between left and right sides, or in the case of autoimmune diseases that occur in particular brain hemispheres, one may treat ipsilateral or contralateral to the stroke-hemisphere or headache side, respectively. Or for a single treatment, one may treat one minute on one side followed by one minute on the opposite side. Variations of these treatment paradigms may be chosen on a patient-by-patient basis. However, it is understood that parameters of the stimulation protocol may be varied in response to heterogeneity in the symptoms of patients. Different stimulation parameters may also be selected as the course of the patient's condition changes. In some embodiments, some methods and devices do not produce clinically significant side effects, such as agitation or anxiety, or changes in heart rate or blood pressure.
In some embodiments, some of the prophylactic treatments may be most effective when the patient is in a prodromal, high-risk bistable state. In that state, the patient is simultaneously able to remain normal or exhibit symptoms, and the selection between normal and symptomatic states depends on the amplification of fluctuations by physiological feedback networks. For example, a thrombus may exist in either a gel or fluid phase, with the feedback amplification of fluctuations driving the change of phase and/or the volume of the gel phase. Thus, a thrombus may form or not, depending on the nonlinear dynamics exhibited by the network of enzymes involved in clot formation, as influenced by blood flow and inflammation that may be modulated by vagus nerve stimulation [PANTELEEV M A, Balandina A N, Lipets E N, Ovanesov M V, Ataullakhanov F I. Task-oriented modular decomposition of biological networks: trigger mechanism in blood coagulation. Biophys J 98(9, 2010):1751-1761, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; Alexey M SHIBEKO, Ekaterina S Lobanova, Mikhail A Panteleev and Fazoil I Ataullakhanov. Blood flow controls coagulation onset via the positive feedback of factor VII activation by factor Xa. BMC Syst Biol 2010; 4(2010):5, pp. 1-12, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein]. Consequently, some of the mechanisms of vagus nerve stimulation treatment during prophylaxis for a stroke are generally different than what occurs during an acute treatment, when the stimulation inhibits excitatory neurotransmission that follows the onset of ischemia that is already caused by the thrombus. Nevertheless, the prophylactic treatment may also inhibit excitatory neurotransmission so as to limit the excitation that would eventually occur upon formation of a thrombus, and the acute treatment may prevent the formation of another thrombus.
Some of the circuits involved in such inhibition are illustrated in
The activation of inhibitory circuits in the periaqueductal gray, raphe nuclei, and locus coeruleus by the hypothalamus or NTS may also cause circuits connecting each of these structures to modulate one another. Thus, the periaqueductal gray communicates with the raphe nuclei and with the locus coeruleus, and the locus coeruleus communicates with the raphe nuclei, as shown in
Description of Various Nerve Stimulating/Modulating Devices
Some devices that are used to stimulate a vagus nerve are now described. An embodiment is shown in
Although a pair of electrodes 340 is shown in
The item labeled in
The control unit 330 controls the impulse generator 310 to generate a signal for each of the device's electrodes (or magnetic coils). The signals are selected to be suitable for amelioration of a particular medical condition, when the signals are applied non-invasively to a target nerve or tissue via the electrodes 340. It is noted that nerve stimulating/modulating device 302 may be referred to by its function as a pulse generator. Patent application publications US2005/0075701 and US2005/0075702, both to SHAFER, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein, contain descriptions of pulse generators that may be applicable to this disclosure. By way of example, a pulse generator is also commercially available, such as Agilent 33522A Function/Arbitrary Waveform Generator, Agilent Technologies, Inc., 5301 Stevens Creek Blvd Santa Clara Calif. 95051.
The control unit 330 may comprise a general purpose computer, comprising one or more CPU, computer memories for the storage of executable computer programs (including the system's operating system) and the storage and retrieval of data, disk storage devices, communication devices (such as serial and USB ports) for accepting external signals from a keyboard, computer mouse, and touchscreen, as well as any externally supplied physiological signals, analog-to-digital converters for digitizing externally supplied analog signals, communication devices for the transmission and receipt of data to and from external devices such as printers and modems that comprise part of the system, hardware for generating the display of information on monitors or display screens that comprise part of the system, and busses to interconnect the above-mentioned components. Thus, the user may operate the system by typing or otherwise providing instructions for the control unit 330 at a device such as a keyboard or touch-screen and view the results on a device such as the system's computer monitor or display screen, or direct the results to a printer, modem, and/or storage disk. Control of the system may be based upon feedback measured from externally supplied physiological or environmental signals. Alternatively, the control unit 330 may have a compact and simple structure, for example, wherein the user may operate the system using only an on/off switch and power control wheel or knob, or their touchscreen equivalent. In a section below, an embodiment is also described wherein the stimulator housing has a simple structure, but other components of the control unit 330 are distributed into other devices (see
Parameters for the nerve or tissue stimulation include power level, frequency and train duration (or pulse number). The stimulation characteristics of each pulse, such as depth of penetration, strength and selectivity, depend on the rise time and peak electrical energy transferred to the electrodes, as well as the spatial distribution of the electric field that is produced by the electrodes. The rise time and peak energy are governed by the electrical characteristics of the stimulator and electrodes, as well as by the anatomy of the region of current flow within the patient. In some embodiments, pulse parameters are set in such a way as to account for the detailed anatomy surrounding the nerve that is being stimulated [Bartosz SAWICKI, Robert Szmurlo, Przemyslaw Plonecki, Jacek Starzynski, Stanislaw Wincenciak, Andrzej Rysz. Mathematical Modelling of Vagus Nerve Stimulation. pp. 92-97 in: Krawczyk, A. Electromagnetic Field, Health and Environment: Proceedings of EHE'07. Amsterdam, 105 Press, 2008, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein]. Pulses may be monophasic, biphasic or polyphasic. In some embodiments, some devices include those that are fixed frequency, where each pulse in a train has the same inter-stimulus interval, and those that have modulated frequency, where the intervals between each pulse in a train can be varied.
In addition, or as an alternative to some of the devices to implement the modulation unit for producing the electrical voltage/current profile of the stimulating, blocking and/or modulating impulse to the electrodes, the device disclosed in US Patent Application Publication No. US2005/0216062, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein, may be employed. That patent publication discloses a multifunctional electrical stimulation (ES) system adapted to yield output signals for effecting electromagnetic or other forms of electrical stimulation for a broad spectrum of different biological and biomedical applications, which produce an electric field pulse in order to non-invasively stimulate nerves. The system includes an ES signal stage having a selector coupled to a plurality of different signal generators, each producing a signal having a distinct shape, such as a sine wave, a square or a saw-tooth wave, or simple or complex pulse, the parameters of which are adjustable in regard to amplitude, duration, repetition rate and other variables. Examples of the signals that may be generated by such a system are described in a publication by LIBOFF [A. R. LIBOFF. Signal shapes in electromagnetic therapies: a primer. pp. 17-37 in: Bioelectromagnetic Medicine (Paul J. Rosch and Marko S. Markov, eds.). New York: Marcel Dekker (2004), the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein]. The signal from the selected generator in the ES stage is fed to at least one output stage where it is processed to produce a high or low voltage or current output of a desired polarity whereby the output stage is capable of yielding an electrical stimulation signal appropriate for its intended application. Also included in the system is a measuring stage which measures and displays the electrical stimulation signal operating on the substance being treated, as well as the outputs of various sensors which sense prevailing conditions prevailing in this substance, whereby the user of the system can manually adjust the signal, or have it automatically adjusted by feedback, to provide an electrical stimulation signal of whatever type the user wishes, who can then observe the effect of this signal on a substance being treated.
The stimulating and/or modulating impulse signal 410 preferably has a frequency, an amplitude, a duty cycle, a pulse width, a pulse shape, etc. selected to influence the therapeutic result, namely, stimulating and/or modulating some or all of the transmission of the selected nerve. For example, the frequency may be about 1 Hz or greater, such as between about 15 Hz to 100 Hz, preferably between about 15-50 Hz and more preferably between about 15-35 Hz. In some embodiments, the frequency is 25 Hz. The modulation signal may have a pulse width selected to influence the therapeutic result, such as about 1 microseconds to about 1000 microseconds, preferably about 100-400 microseconds and more preferably about 200-400 microseconds. For example, the electric field induced or produced by the device within tissue in the vicinity of a nerve may be about 5 to 600 V/m, preferably less than 100 V/m, and even more preferably less than 30 V/m. The gradient of the electric field may be greater than 2 V/m/mm. More generally, the stimulation device produces an electric field in the vicinity of the nerve that is sufficient to cause the nerve to depolarize and reach a threshold for action potential propagation, which is approximately 8 V/m at 1000 Hz. The modulation signal may have a peak voltage amplitude selected to influence the therapeutic result, such as about 0.2 volts or greater, such as about 0.2 volts to about 40 volts, preferably between about 1-20 volts and more preferably between about 2-12 volts.
In some embodiments, an objective of some of the disclosed stimulators is to provide both nerve fiber selectivity and spatial selectivity. Spatial selectivity may be achieved in part through the design of the electrode (or magnetic coil) configuration, and nerve fiber selectivity may be achieved in part through the design of the stimulus waveform, but designs for the two types of selectivity are intertwined. This is because, for example, a waveform may selectively stimulate only one of two nerves whether they lie close to one another or not, obviating the need to focus the stimulating signal onto only one of the nerves [GRILL W and Mortimer J T. Stimulus waveforms for selective neural stimulation. IEEE Eng. Med. Biol. 14 (1995): 375-385, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein]. These methods complement others that are used to achieve selective nerve stimulation, such as the use of local anesthetic, application of pressure, inducement of ischemia, cooling, use of ultrasound, graded increases in stimulus intensity, exploiting the absolute refractory period of axons, and the application of stimulus blocks [John E. SWETT and Charles M. Bourassa. Electrical stimulation of peripheral nerve. In: Electrical Stimulation Research Techniques, Michael M. Patterson and Raymond P. Kesner, eds. Academic Press. (New York, 1981) pp. 243-295, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein].
For some devices, to date, some of the selection of stimulation waveform parameters for nerve stimulation has been highly empirical, in which the parameters are varied about some initially successful set of parameters, in an effort to find an improved set of parameters for each patient. A more efficient approach to selecting stimulation parameters might be to select a stimulation waveform that mimics electrical activity in the anatomical regions that one is attempting stimulate indirectly, in an effort to entrain the naturally occurring electrical waveform, as suggested in patent number U.S. Pat. No. 6,234,953, entitled Electrotherapy device using low frequency magnetic pulses, to THOMAS et al; the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein, and application number US20090299435, entitled Systems and methods for enhancing or affecting neural stimulation efficiency and/or efficacy, to GLINER et al, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein. One may also vary stimulation parameters iteratively, in search of an optimal setting [U.S. Pat. No. 7,869,885, entitled Threshold optimization for tissue stimulation therapy, to BEGNAUD et al, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein]. However, some stimulation waveforms, such as those described herein, are discovered by trial and error, and then deliberately improved upon.
Invasive nerve stimulation typically uses square wave pulse signals. However, Applicant found that square waveforms are not ideal for non-invasive stimulation, as they produce excessive pain, but still can be used. Prepulses and similar waveform modifications have been suggested as methods to improve selectivity of nerve stimulation waveforms, but Applicant also did not find them ideal, although they still can be used [Aleksandra VUCKOVIC, Marco Tosato and Johannes J Struijk. A comparative study of three techniques for diameter selective fiber activation in the vagal nerve: anodal block, depolarizing prepulses and slowly rising pulses. J. Neural Eng. 5 (2008): 275-286, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; Aleksandra VUCKOVIC, Nico J. M. Rijkhoff, and Johannes J. Struijk. Different Pulse Shapes to Obtain Small Fiber Selective Activation by Anodal Blocking—A Simulation Study. IEEE Transactions on Biomedical Engineering 51(5, 2004):698-706, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; Kristian HENNINGS. Selective Electrical Stimulation of Peripheral Nerve Fibers: Accommodation Based Methods. Ph.D. Thesis, Center for Sensory-Motor Interaction, Aalborg University, Aalborg, Denmark, 2004, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein].
The Applicant also found that stimulation waveforms including of bursts of square pulses are not ideal for non-invasive stimulation, but can still be used [M. I. JOHNSON, C. H. Ashton, D. R. Bousfield and J. W. Thompson. Analgesic effects of different pulse patterns of transcutaneous electrical nerve stimulation on cold-induced pain in normal subjects. Journal of Psychosomatic Research 35 (2/3, 1991):313-321, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; U.S. Pat. No. 7,734,340, entitled Stimulation design for neuromodulation, to De Ridder, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein]. However, bursts of sinusoidal pulses are a desired stimulation waveform, as shown in
The above waveform is essentially a 1-20 KHz signal that includes bursts of pulses with each burst having a frequency of about 10-100 Hz and each pulse having a frequency of about 1-20 KHz. Another way of thinking about the waveform is that it is a 1-20 KHz waveform that repeats itself at a frequency of about 10-100 Hz. The Applicant is unaware of such a waveform having been used with vagus nerve stimulation, but a similar waveform has been used to stimulate muscle as a means of increasing muscle strength in elite athletes. However, for the muscle strengthening application, the currents used (200 mA) may be very painful and two orders of magnitude larger than what are disclosed herein. Furthermore, the signal used for muscle strengthening may be other than sinusoidal (e.g., triangular), and the parameters τ, N, and T may also be dissimilar from the values exemplified above [A. DELITTO, M. Brown, M. J. Strube, S. J. Rose, and R. C. Lehman. Electrical stimulation of the quadriceps femoris in an elite weight lifter: a single subject experiment. Int J Sports Med 10(1989):187-191, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; Alex R WARD, Nataliya Shkuratova. Russian Electrical Stimulation: The Early Experiments. Physical Therapy 82 (10, 2002): 1019-1030, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; Yocheved LAUFER and Michal Elboim. Effect of Burst Frequency and Duration of Kilohertz-Frequency Alternating Currents and of Low-Frequency Pulsed Currents on Strength of Contraction, Muscle Fatigue, and Perceived Discomfort. Physical Therapy 88 (10, 2008):1167-1176, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; Alex R WARD. Electrical Stimulation Using Kilohertz-Frequency Alternating Current. Physical Therapy 89 (2, 2009):181-190, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; J. PETROFSKY, M. Laymon, M. Prowse, S. Gunda, and J. Batt. The transfer of current through skin and muscle during electrical stimulation with sine, square, Russian and interferential waveforms. Journal of Medical Engineering and Technology 33 (2, 2009): 170-181, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; U.S. Pat. No. 4,177,819, entitled Muscle stimulating apparatus, to KOFSKY et al, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein]. Burst stimulation has also been disclosed in connection with implantable pulse generators, but wherein the bursting is characteristic of the neuronal firing pattern itself [U.S. Pat. No. 7,734,340 to DE RIDDER, entitled Stimulation design for neuromodulation, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; US Patent Application Publication US20110184486 to DE RIDDER, entitled Combination of tonic and burst stimulations to treat neurological disorders, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein]. By way of example, the electric field shown in
In some embodiments, the use of feedback to generate the modulation signal 400 may result in a signal that is not periodic, particularly if the feedback is produced from sensors that measure naturally occurring, time-varying aperiodic physiological signals from the patient. In fact, the absence of significant fluctuation in naturally occurring physiological signals from a patient is ordinarily considered to be an indication that the patient is in ill health. This is because a pathological control system that regulates the patient's physiological variables may have become trapped around only one of two or more possible steady states and is therefore unable to respond normally to external and internal stresses. Accordingly, even if feedback is not used to generate the modulation signal 400, it may be useful to artificially modulate the signal in an aperiodic fashion, in such a way as to simulate fluctuations that would occur naturally in a healthy individual. Thus, the noisy modulation of the stimulation signal may cause a pathological physiological control system to be reset or undergo a non-linear phase transition, through a mechanism known as stochastic resonance [B. SUKI, A. Alencar, M. K. Sujeer, K. R. Lutchen, J. J. Collins, J. S. Andrade, E. P. Ingenito, S. Zapperi, H. E. Stanley, Life-support system benefits from noise, Nature 393 (1998) 127-128, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; W Alan C MUTCH, M Ruth Graham, Linda G Girling and John F Brewster. Fractal ventilation enhances respiratory sinus arrhythmia. Respiratory Research 2005, 6:41, pp. 1-9, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein].
In some embodiments, the modulation signal 400, with or without feedback, will stimulate the selected nerve fibers in such a way that one or more of the stimulation parameters (e.g., power, frequency, and others mentioned herein) are varied by sampling a statistical distribution having a mean corresponding to a selected, or to a most recent running-averaged value of the parameter, and then setting the value of the parameter to the randomly sampled value. The sampled statistical distributions will comprise Gaussian and 1/f, obtained from recorded naturally occurring random time series or by calculated formula. Parameter values will be so changed periodically, or at time intervals that are themselves selected randomly by sampling another statistical distribution, having a selected mean and coefficient of variation, where the sampled distributions comprise Gaussian and exponential, obtained from recorded naturally occurring random time series or by calculated formula.
In some embodiments, some devices, as disclosed herein, are provided in a “pacemaker” type form, in which electrical impulses 410 are generated to a selected region of the nerve by a stimulator device on an intermittent basis, to create in the patient a lower reactivity of the nerve.
Embodiments of the Electrode-Based Stimulators
The electrodes of the some of the devices, as disclosed herein, are applied to the surface of the neck, or to some other surface of the body, and are used to deliver electrical energy non-invasively to a nerve. Embodiments may differ with regard to the number of electrodes that are used, the distance between electrodes, and whether disk or ring electrodes are used. In some embodiments, one selects the electrode configuration for individual patients, in such a way as to optimally focus electric fields and currents onto the selected nerve, without generating excessive currents on the surface of the skin. This tradeoff between focality and surface currents is described by DATTA et al. [Abhishek DATTA, Maged Elwassif, Fortunato Battaglia and Marom Bikson. Transcranial current stimulation focality using disc and ring electrode configurations: FEM analysis. J. Neural Eng. 5 (2008): 163-174, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein]. Although DATTA et al. are addressing the selection of electrode configuration specifically for transcranial current stimulation, some of the principles that they describe are applicable to peripheral nerves as well [RATTAY F. Analysis of models for extracellular fiber stimulation. IEEE Trans. Biomed. Eng. 36 (1989): 676-682, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein].
An embodiment of an electrode-based stimulator is shown in
A dome (39) also protrudes from the housing, so as to allow the device to lie more or less flat on a table when supported also by the electrode surfaces. The dome also accommodates a relatively tall component that may lie underneath it, such as a battery. Alternatively, the stimuluation device may be powered by the smartphone's battery. If the battery under the dome is rechargeable, the dome may contain a socket (41) through which the battery is recharged using a jack that is inserted into it, which is, for example, attached to a power cable from a base station (described below). The belly (40) of the housing protrudes to a lesser extent than the electrodes and dome. The belly accommodates a printed circuit board that contains electronic components within the housing (not shown), as described below.
Generally, the stimulator is designed to situate the electrodes of the stimulator (340 in
In some embodiments, the disc interface 351 actually functions as the electrode and the screw 340 is simply the output connection to the signal generator electronics. In this embodiment, electrically conductive fluid (e.g., liquid, gas) or gel is positioned between the signal generator and the interface or electrode 351. In this embodiment, the conductive fluid filters out or eliminates high frequency components from the signal to smooth out the signal before it reaches the electrode(s) 351. When the signal is generated, power switching and electrical noise typically add unwanted high frequency spikes back into the signal. In addition, the pulsing of the sinusoidal bursts may induce high frequency components in the signal. By filtering the signal just before it reaches the electrodes 351 with the conductive fluid, a smoother, cleaner signal is applied to the patient, thereby reducing the pain and discomfort felt by the patient and allowing a higher amplitude to be applied to the patient. This allows a sufficiently strong signal to be applied to reach a deeper nerve, such as the vagus nerve, without causing too much pain and discomfort to the patient at the surface of their skin.
In some embodiments, a low-pass filter may be used additional to or instead of the electrically conductive fluid to filter out the undesirable high frequency components of the signal. The low-pass filter may comprise a digital or active filter or simply two series resistors and a parallel capacitor placed between the signal generator and the electrode/interface.
The electrode surface (33) was shown in
Electronics and Software of the Stimulator
In some embodiments, the signal waveform (
In some embodiments, the waveform is first conveyed by the software application to contacts within the phone's speaker output or the earphone jack socket (37 in
In addition to passing the stimulation waveform from the smartphone to the stimulator housing as described herein, the smartphone may also pass control signals to the stimulator housing. Thus, the stimulation waveform may generally be regarded as a type of analog, pseudo-audio signal, but if the signal contains a signature series of pulses signifying that a digital control signal is about to be sent, logic circuitry in the stimulator housing may then be set to decode the series of digital pulses that follows the signature series of pulses, analogous to the operation of a modem.
Many of the steps that direct the waveform to the electrodes, including steps that may be controlled by the user via the touchscreen (31 in
In some embodiments, the stimulator and/or smartphone will include a user control, such as a switch or button, that disables/enables the stimulator. Preferably, the switch will automatically disable some, many, most, or all smartphone functions when the stimulator is enabled (and vice versa). This ensures that the medical device functionality of the smartphone is completely segregated from the rest of the phone's functionality. In some embodiments, the switch will be password-controlled such that only the patient/owner of the stimulator/phone will be able to enable the stimulator functionality. In one such embodiment, the switch will be controlled by a biometric scan (e.g., fingerprint, optical scan or the like) such that the stimulator functionality can only be used by the patient. This ensures that only the patient will be able to use the prescribed therapy in the event the phone is lost or stolen.
The stimulator and/or phone can also include software that allows the patient to order more therapy doses over the internet (discussed in more detail below in connection with the docking station). The purchase of such therapy doses will require physician authorization through a prescription or the like. To that end, the software can include an authorization code for entry in order for the patient to download authorization for more therapies. In some embodiments, without such authorization, the stimulator will be disabled and will not deliver therapy.
Although the device shown in
In some embodiments, the stimulator housing may be designed as part of a protective or decorative case for the phone that can be attached to the phone, similar to standard phone cases. In one such embodiment, the stimulator/case may also include additional battery life for the phone and may include an electrical connection to the phone's battery to recharge the battery (e.g., part of a Mophie® or the like). This electrical connection may also be used to couple the smartphone to the stimulator.
Embodiments with Distributed Controllers
In some embodiments, significant portions of the control of the vagus nerve stimulation reside in controller components that are physically separate from the housing of the stimulator. In these embodiment, separate components of the controller and stimulator housing generally communicate with one another wirelessly, although wired or waveguide communication is possible. Thus, the use of wireless technology avoids the inconvenience and distance limitations of interconnecting cables. Additional reasons in the present disclosure for physically separating many components of the controller from the stimulator housing are as follows.
First, the stimulator may be constructed with the minimum number of components needed to generate the stimulation pulses, with the remaining components placed in parts of the controller that reside outside the stimulator housing, resulting in a lighter and smaller stimulator housing. In fact, the stimulator housing may be made so small that it could be difficult to place, on the stimulator housing's exterior, switches and knobs that are large enough to be operated easily. Instead, for the present disclosure, the user may generally operate the device using the smartphone touchscreen.
Second, the controller (330 in
Third, communication from the databases to the controller would also be useful for purposes of metering electrical stimulation of the patient, when the stimulation is self-administered. For example, if the prescription for the patient only permits only a specified amount of stimulation energy to be delivered during a single session of vagus nerve stimulation, followed by a wait-time before allowing the next stimulation, the controller can query the database and then permit the stimulation only when the prescribed wait-time has passed. Similarly, the controller can query the billing system to assure that the patient's account is in order, and withhold the stimulation if there is a problem with the account.
Fourth, as a corollary of the previous considerations, the controller may be constructed to include a computer program separate from the stimulating device, in which the databases are accessed via cell phone or internet connections.
Fifth, in some applications, it may be desired that the stimulator housing and parts of the controller be physically separate. For example, when the patient is a child, one wants to make it impossible for the child to control or adjust the vagus nerve stimulation. The best arrangement in that case is for the stimulator housing to have no touchscreen elements, control switches or adjustment knobs that could be activated by the child. Alternatively, any touchscreen elements, switches and knobs on the stimulator can be disabled, and control of the stimulation then resides only in a remote controller with a child-proof operation, which would be maintained under the control of a parent or healthcare provider.
Sixth, in some applications, the particular control signal that is transmitted to the stimulator by the controller will depend on physiological and environmental signals that are themselves transmitted to and analyzed by the controller. In such applications, many of the physiological and environmental signals may already be transmitted wirelessly, in which case it is most convenient to design an external part of the controller as the hub of all such wireless activity, including any wireless signals that are sent to and from the stimulator housing.
With these considerations in mind, an embodiment of can include a base station that may send/receive data to/from the stimulator, and may send/receive data to/from databases and other components of the system, including those that are accessible via the internet (or another network such as local area, wide area, satellite, cellular). Typically, the base station will be a laptop computer attached to additional components needed for it to accomplish its function. Thus, prior to any particular stimulation session, the base station may load into the stimulator (
The communication connections between different components of the stimulator's controller are shown in
Although infrared or ultrasound wireless control might be used to communicate between components of the controller, they are not preferred because of line-of-sight limitations. Instead, in the present disclosure, the communication between devices preferably makes use of radio communication within unlicensed ISM frequency bands (260-470 MHz, 902-928 MHz, 2400-2.4835 GHz). Components of the radio frequency system in devices in 331, 332, and 333 typically comprise a system-on-chip transciever with an integrated microcontroller; a crystal; associated balun & matching circuitry, and an antenna [Dag GRINI. RF Basics, RF for Non-R F Engineers. Texas Instruments, Post Office Box 655303, Dallas, Tex. 75265, 2006, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein].
Transceivers based on 2.4 GHz offer high data rates (greater than 1 Mbps) and a smaller antenna than those operating at lower frequencies, which makes them suitable for with short-range devices. Furthermore, a 2.4 GHz wireless standard (e.g., Bluetooth, Wi-Fi, and ZigBee) may be used as the protocol for transmission between devices. Although the ZigBee wireless standard operates at 2.4 GHz in most jurisdictions worldwide, it also operates in the ISM frequencies 868 MHz in Europe, and 915 MHz in the USA and Australia. Data transmission rates vary from 20 to 250 kilobits/second with that standard. Because many commercially available health-related sensors may operate using ZigBee, its use may be recommended for applications in which the controller uses feedback and feedforward methods to adjust the patient's vagus nerve stimulation based on the sensors' values, as described below in connection with
A 2.4 GHz radio has higher power consumption than radios operating at lower frequencies, due to reduced circuit efficiencies. Furthermore, the 2.4 GHz spectrum is crowded and subject to significant interference from microwave ovens, cordless phones, 802.11b/g wireless local area networks, Bluetooth devices, etc. Sub-GHz radios enable lower power consumption and can operate for years on a single battery. These factors, combined with lower system cost, make sub-GHz transceivers ideal for low data rate applications that need maximum range and multi-year operating life.
The antenna length needed for operating at different frequencies is 17.3 cm at 433 MHz, 8.2 cm at 915 MHz, and 3 cm at 2.4 GHz. Therefore, unless the antenna is included in a neck collar that supports the device shown in
Range is determined by the sensitivity of the transceiver and its output power. A primary factor affecting radio sensitivity is the data rate. Higher data rates reduce sensitivity, leading to a need for higher output power to achieve sufficient range. For many applications that require only a low data rate, the preferred rate is 40 Kbps where the transceiver can still use a standard off-the-shelf 20 parts per million crystal.
A signal waveform that might be transmitted wirelessly to the stimulator housing was shown in
However, because it is contemplated that sensors attached to the stimulator housing may also be transmitting information, the data transfer requirements may be substantially greater than what is required only to transmit the signal shown in
Applications of Stimulators to the Neck of the Patient
Selected nerve fibers are stimulated in different embodiments of methods that make use of the disclosed electrical stimulation devices, including stimulation of the vagus nerve at a location in the patient's neck. At that location, the vagus nerve is situated within the carotid sheath, near the carotid artery and the interior jugular vein. The carotid sheath is located at the lateral boundary of the retropharyngeal space on each side of the neck and deep to the sternocleidomastoid muscle. The left vagus nerve is sometimes selected for stimulation because stimulation of the right vagus nerve may produce undesired effects on the heart, but depending on the application, the right vagus nerve or both right and left vagus nerves may be stimulated instead.
The three major structures within the carotid sheath are the common carotid artery, the internal jugular vein and the vagus nerve. The carotid artery lies medial to the internal jugular vein, and the vagus nerve is situated posteriorly between the two vessels. Typically, the location of the carotid sheath or interior jugular vein in a patient (and therefore the location of the vagus nerve) will be ascertained in any manner known in the art, e.g., by feel or ultrasound imaging. Proceeding from the skin of the neck above the sternocleidomastoid muscle to the vagus nerve, a line may pass successively through the sternocleidomastoid muscle, the carotid sheath and the internal jugular vein, unless the position on the skin is immediately to either side of the external jugular vein. In the latter case, the line may pass successively through only the sternocleidomastoid muscle and the carotid sheath before encountering the vagus nerve, missing the interior jugular vein. Accordingly, a point on the neck adjacent to the external jugular vein might be preferred for non-invasive stimulation of the vagus nerve. The magnetic stimulator coil may be centered on such a point, at the level of about the fifth to sixth cervical vertebra.
Some methods of treating a patient comprise stimulating the vagus nerve as indicated in
The stimulation is then performed with a sinusoidal burst waveform like that shown in
When a patient is using the stimulation device to perform self-stimulation therapy, e.g., at home or at a workplace, he or she will follow the steps that are now described. It is assumed that the optimal stimulation position has already been marked on the patient's neck, as described above and that a reference image of the fluorescent spots has already been acquired. The previous stimulation session will ordinarily have discharged the rechargeable batteries of the stimulator housing, and between sessions, the base station will have been used to recharged the stimulator at most only up to a minimum level. If the stimulator's batteries had charge remaining from the previous stimulation session, the base station will discharge the stimulator to a minimum level that will not support stimulation of the patient.
The patient can initiate the stimulation session using the mobile phone or base station (e.g., laptop computer) by invoking a computer program (on the laptop computer or through an app on the mobile phone) that is designed to initiate use of the stimulator. The programs in the smartphone and base station may initiate and interact with one another wirelessly, so in what follows, reference to the program (app) in the smartphone may also apply to the program in the base station, because both may be operating in tandem. For security reasons, the program would begin with the request for a user name and a password, and that user's demographic information and any data from previous stimulator experiences would already be associated with it in the login account. The smartphone may also be used to authenticate the patient using a fingerprint or voice recognition app, or other reliable authentication methods. If the patient's physician has not authorized further treatments, the base station will not charge the stimulator's batteries, and instead, the computer program will call or otherwise communicate with the physician's computer requesting authorization. After authorization by the physician is received, the computer program (on the laptop computer or through an app on the mobile phone) may also query a database that is ordinarily located somewhere on the internet to verify that the patient's account is in order. If it is not in order, the program may then request prepayment for one or more stimulation sessions, which would be paid by the patient using a credit card, debit card, PayPal, cryptocurrency, bitcoin, or the like. The computer program will also query its internal database or that of the base station to determine that sufficient time has elapsed between when the stimulator was last used and the present time, to verify that any required wait-time has elapsed.
Having received authorization to perform a nerve stimulation session, the patient interface computer program will then ask the patient questions that are relevant to the selection of parameters that the base station will use to make the stimulator ready for the stimulation session. The questions that the computer program asks are dependent on the condition for which the patient is being treated, which for present purposes is considered to be treatment for an autoimmune disease or disorder. The questions may be things like (1) is this an acute or prophylactic treatment? (2) if acute, then how severe is your pain and in what locations, how long have you had it, (3) has anything unusual or noteworthy occurred since the last stimulation?, etc.
Having received such preliminary information from the patient, the computer programs will perform instrument diagnostic tests and make the stimulator ready for the stimulation session. In general, the algorithm for setting the stimulator parameters will have been decided by the physician and will include the extent to which the stimulator batteries should be charged, which the vagus nerve should be stimulated (right or left), and the time that the patient should wait after the stimulation session is ended until initiation of a subsequent stimulation session. The computer will query the physician's computer to ascertain whether there have been any updates to the algorithm, and if not, will use the existing algorithm. The patient will also be advised of the stimulation session parameter values by the interface computer program, so as to know what to expect.
Once the base station has been used to charge the stimulator's batteries to the requisite charge, the computer program (or smartphone app) will indicate to the patient that the stimulator is ready for use. At that point, the patient would clean the electrode surfaces, and make any other preliminary adjustments to the hardware. The stimulation parameters for the session will be displayed, and any options that the patient is allowed to select may be made. Once the patient is ready to begin, he or she will press a “start” button on the touchscreen and may begin the vagus nerve stimulation, as shown in
Multiple methods may be used to test whether the patient is properly attempting to stimulate the vagus nerve (or another nerve or organ or muscle or bone) on the intended side of the neck (or another portion of a human body). For example, accelerometers and gyroscopes within the smartphone may be used to determine the position and orientation of the smartphone's touch screen relative to the patient's expected view of the screen, and a decision by the stimulator's computer program as to which hand is being used to hold the stimulator may be made by measuring capacitance on the outside of the stimulator body, which may distinguish fingers wrapped around the device versus the ball of a thumb [Raphael WIMMER and Sebastian Boring. HandSense: discriminating different ways of grasping and holding a tangible user interface. Proceedings of the 3rd International Conference on Tangible and Embedded Interaction, pp. 359-362. ACM New York, N.Y., 2009, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein]. Pressing of the electrodes against the skin will result in a resistance drop across the electrodes, which can initiate operation of the rear camera. A fluorescent image should appear on the smartphone screen only if the device is applied to the side of the neck in the vicinity of the fluorescent spots that had been applied as a tattoo earlier. If the totality of these data indicates to the computer program that the patient is attempting to stimulate the wrong vagus nerve or that the device is being held improperly, the stimulation will be withheld, and the stimulator may then communicate with the patient via the interface computer program (in the mobile phone or laptop computer) to alert the patient of that fact. The program may then offer suggestions on how to better apply the device to the neck.
However, if the stimulator is being properly applied, and an image of the fluorescent spots on the patient's neck appears on the screen of the phone, the stimulator begins to stimulate according to predetermined initial stimulus parameters. The patient will then adjust the position and angular orientation of the stimulator about what he or she thinks is the correct neck position, until he or she perceives stimulation when current is passed through the stimulator electrodes. An attempt is also made to superimpose the currently viewed fluorescence image of the neck spots with the previously acquired reference image. The applied current is increased gradually using keys on the keyboard of the base station or on the smartphone touchscreen, first to a level wherein the patient feels sensation from the stimulation. The stimulation amplitude is then increased by the patient, but is set to a level that is less than one at which he first senses any discomfort. By trial and error, the stimulation is then optimized by the patient, who tries to find the greatest acceptable sensation with the lowest acceptable stimulation amplitude, with the stimulator aligned using the fluorescent spots. If the stimulator is being held in place by hand, it is likely that there may be inadvertent fluctuating movement of the stimulator, due for example to neck movement during respiration. Such relative movements will affect the effectiveness of the stimulation. However, they may be monitored by accelerometers and gyroscopes within the smartphone, which may be transmitted as movement data from the stimulator to the patient interface computer program (in the mobile phone or laptop computer). The relative movements may also be monitored and measured as fluctuations in the position of the fluorescence spots that are being imaged. By watching a graphical display of the relative movements shown by the patient interface computer program, the patient may use that display in an attempt to deliberately minimize the movements. Otherwise, the patient may attempt to adjust the amplitude of the stimulator as compensation for movement of the stimulator away from its optimum position. In a section that follows, it is described how the stimulator itself may modulate the amplitude of the stimulation in order to make such compensations.
During the session, the patient may lift the stimulator from his neck, which will be detected as an increase in resistance between the electrodes and a loss of the fluorescent image of the spots on the patient's neck. When that occurs, the device will withhold power to the stimulator for reasons of safety. The patient can then reapply the stimulator to his neck to resume the session, although the interruption of stimulation will be recognized and recorded by the computer program. Stimulation by the patient will then continue until the battery of the stimulator is depleted, or the patient decides to terminate the stimulation session. At that point, the patient will acknowledge that the stimulation session is finished by touching a response button on the smartphone screen, whereupon the stimulator will transfer to the base station data that its microprocessor has caused to be stored regarding the stimulation session (e.g., stimulation amplitude as a function of time and information about movements of the device during the session, duration of the stimulation, the existence of interruptions, etc.). Such information will then be transmitted to and displayed by the patient interface computer program (in the mobile phone or laptop computer), which will subsequently ask the patient questions regarding the effectiveness of the stimulation. Such questions may be in regards to the post-stimulation severity of the headache, whether the severity decreased gradually or abruptly during the course of the stimulation, and whether anything unusual or noteworthy occurred during the stimulation. Some, most, many, or all of such post-stimulation data will also be delivered over the internet by the patient interface computer program to the physician's computer for review and possible adjustment of the algorithm that is used to select stimulation parameters and regimens. It is understood that the physician will adjust the algorithm based not only on the experience of each individual patient, but on the experience of all patients collectively so as to improve effectiveness of the stimulator's use, for example, by identifying characteristics of most and least responsive patients.
Before logging off of the interface computer program, the patient may also review database records and summaries about all previous treatment sessions, so as to make his or her own judgment about treatment progress. If the stimulation was part of a prophylactic treatment regimen that was prescribed by the patient's physician, the patient interface computer program will remind the patient about the schedule for the upcoming self-treatment sessions and allow for a rescheduling if necessary.
For some patients, the stimulation may be performed for as little as 90 seconds, but it may also be for up to 30 minutes or longer. The treatment is generally performed once or twice daily or several times a week, for 12 weeks or longer before a decision is made as to whether to continue the treatment. For patients experiencing intermittent symptoms, the treatment may be performed only when the patient is symptomatic. However, it is understood that parameters of the stimulation protocol may be varied in response to heterogeneity in the pathophysiology of patients. Different stimulation parameters may also be used as the course of the patient's condition changes.
In some embodiments, pairing of vagus nerve stimulation may be with an additional sensory stimulation. The paired sensory stimulation may be bright light, sound, tactile stimulation, or electrical stimulation of the tongue to simulate odor/taste, e.g., pulsating with the same frequency as the vagus nerve electrical stimulation. The rationale for paired sensory stimulation is the same as simultaneous, paired stimulation of both left and right vagus nerves, namely, that the pair of signals interacting with one another in the brain may result in the formation of larger and more coherent neural ensembles than the neural ensembles associated with the individual signals, thereby enhancing the therapeutic effect. This pairing may be considered especially when some such corresponding sensory circuit of the brain is thought to be partly responsible for triggering the migraine headache.
Selection of stimulation parameters to preferentially stimulate particular regions of the brain may be done empirically, wherein a set of stimulation parameters are chosen, and the responsive region of the brain is measured using fMRI or a related imaging method [CHAE JH, Nahas Z, Lomarev M, Denslow S, Lorberbaum J P, Bohning D E, George M S. A review of functional neuroimaging studies of vagus nerve stimulation (VNS). J Psychiatr Res. 37(6, 2003):443-455, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; CONWAY CR, Sheline Y I, Chibnall J T, George M S, Fletcher J W, Mintun M A. Cerebral blood flow changes during vagus nerve stimulation for depression. Psychiatry Res. 146(2, 2006):179-84, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein]. Thus, by performing the imaging with different sets of stimulation parameters, a database may be constructed, such that the inverse problem of selecting parameters to match a particular brain region may be solved by consulting the database.
The individualized selection of parameters for the nerve stimulation protocol may be based on trial and error in order to obtain a beneficial response without the sensation of skin pain or muscle twitches. Alternatively, the selection of parameter values may involve tuning as understood in control theory, as described below. It is understood that parameters may also be varied randomly in order to simulate normal physiological variability, thereby possibly inducing a beneficial response in the patient [Buchman T G. Nonlinear dynamics, complex systems, and the pathobiology of critical illness. Curr Opin Crit Care 10(5, 2004):378-82, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein].
In some embodiments, various methods can use vagal nerve stimulation to suppress inflammation. In some embodiments, some methods and devices involve the inhibition of pro-inflammatory cytokines, or more specifically, stimulation of the vagus nerve to inhibit and/or block the release of such pro-inflammatory cytokines. In some embodiments, some methods and devices use vagal nerve stimulation to increase the concentration or effectiveness of anti-inflammatory cytokines. TRACEY et al do not consider the modulation of anti-inflammatory cytokines to be part of the cholinergic anti-inflammatory pathway that their method of vagal nerve stimulation is intended to activate. Thus, they explain that “activation of vagus nerve cholinergic signaling inhibits TNF (tumor necrosis factor) and other proinflammatory cytokine overproduction through ‘immune’ a7 nicotinic receptor-mediated mechanisms” [V. A. PAVLOV and K. J. Tracey. Controlling inflammation: the cholinergic anti-inflammatory pathway. Biochemical Society Transactions 34, (2006, 6): 1037-1040, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein]. In contrast, anti-inflammatory cytokines are said to be part of a different “diffusible anti-inflammatory network, which includes glucocorticoids, anti-inflammatory cytokines, and other humoral mediators” [CZURA CJ, Tracey K J. Autonomic neural regulation of immunity. J Intern Med. 257(2005, 2): 156-66, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein]. Others make a similar distinction between vagal and humoral mediation [GUYON A, Massa F, Rovére C, Nahon J L. How cytokines can influence the brain: a role for chemokines? J Neuroimmunol 2008; 198:46-55, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein].
The disclaiming by TRACEY and colleagues of a role for anti-inflammatory cytokines as mediators of inflammation following stimulation of the vagus nerve may be due to a recognition that anti-inflammatory cytokines (e.g., TGF-ß) are usually produced constitutively, while pro-inflammatory cytokines (e.g., TNF-alpha) are not produced constitutively, but are instead induced. However, anti-inflammatory cytokines are inducible as well as constitutive, so that for example, an increase in the concentrations of potentially anti-inflammatory cytokines such as transforming growth factor-beta (TGF-13) can in fact be accomplished through stimulation of the vagus nerve [RA BAUMGARTNER, Va. Deramo and MA Beaven. Constitutive and inducible mechanisms for synthesis and release of cytokines in immune cell lines. The Journal of Immunology 157 (1996, 9): 4087-4093, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; CORCORAN, Ciaran; Connor, Thomas J; O'Keane, Veronica; Garland, Malcolm R. The effects of vagus nerve stimulation on pro- and anti-inflammatory cytokines in humans: a preliminary report. Neuroimmunomodulation 12 (5, 2005): 307-309, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein].
An example of a pro-anti-inflammatory mechanism that is particularly relevant to the treatment of multiple sclerosis is as follows. TGF-ß converts undifferentiated T cells into regulatory T (Treg) cells that block the autoimmunity that causes demyelination in multiple sclerosis. However, in the presence of interleukin-6, TGF-ß also causes the differentiation of T lymphocytes into proinflammatory IL-17 cytokine-producing T helper 17 (TH17) cells, which promote autoimmunity and inflammation. Thus, it is conceivable that an increase of TGF-ß levels might actually cause or exacerbate inflammation, rather than suppress it. Accordingly, a step in an embodiment of the methods that are disclosed herein is to deter TGF-ß from realizing its pro-inflammatory potential, by selecting nerve stimulation parameters that bias the potential of TGF-ß towards anti-inflammation, and/or by treating the patient with an agent such as the vitamin A metabolite retinoic acid that is known to promote such an anti-inflammatory bias [MUCIDA D, Park Y, Kim G, Turovskaya O, Scott I, Kronenberg M, Cheroutre H. Reciprocal T H17 and regulatory T cell differentiation mediated by retinoic acid. Science 317(2007, 5835): 256-60, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; Sheng XIAO, Hulin Jin, Thomas Korn, Sue M. Liu, Mohamed Oukka, Bing Lim, and Vijay K. Kuchroo. Retinoic acid increases Foxp3+ regulatory T cells and inhibits development of Th17 cells by enhancing TGF-ß-driven Smad3 signaling and inhibiting IL-6 and IL-23 receptor expression. J Immunol. 181(2008, 4): 2277-2284, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein]. Retinoic acid is a member of a class of compounds known as retinoids, comprising three generations: (1) retinol, retinal, retinoic acid (tretinoin, Retin-A), isotretinoin and alitretinoin; (2) etretinate and acitretin; (3) tazarotene, bexarotene and Adapalene.
In some embodiments, endogenous retinoic acid that is released by neurons themselves is used to produce the anti-inflammatory bias. Thus, vagal nerve stimulation may induce differentiation through release of retinoic acid that is produced in neurons from retinaldehyde by retinaldehyde dehydrogenases, and some embodiments disclosed herein can promote anti-inflammatory regulatory T cell (Treg) differentiation by this type of mechanism [van de PAVERT SA, Olivier B J, Goverse G, Vondenhoff M F, Greuter M, Beke P, Kusser K, Höpken UE, Lipp M, Niederreither K, Blomhoff R, Sitnik K, Agace W W, Randall T D, de Jonge W J, Mebius R E. Chemokine CXCL13 is essential for lymph node initiation and is induced by retinoic acid and neuronal stimulation. Nat Immunol. 10(11, 2009): 1193-1199, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein].
The retinoic acid so released might also directly inhibit the release or functioning of proinflammatory cytokines, which would be an anti-pro-inflammatory mechanism that is distinct from the one proposed by TRACEY and colleagues [Malcolm Maden. Retinoic acid in the development, regeneration and maintenance of the nervous system. Nature Reviews Neuroscience 8(2007), 755-765, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein]. However, if the proinflammatory cytokine that is blocked is TNF-alpha, its inhibition in multiple sclerosis patients might be counterproductive. This is because blocking TNF-alpha with the drug lenercept promotes and exacerbates multiple sclerosis attacks rather than delaying them, which might be attributable to the fact that TNF-alpha promotes remyelination and the proliferation of oligodendrocytes that perform the myelination. [ANONYMOUS. TNF neutralization in MS: Results of a randomized, placebo controlled multicenter study. Neurology 1999, 53:457, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; ARNETT HA, Mason J, Marino M, Suzuki K, Matsushima G K, Ting J P. TNF alpha promotes proliferation of oligodendrocyte progenitors and remyelination. Nat Neurosci 2001, 4:1116-1122, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein].
In this example, the competence of anti-inflammatory cytokines may be modulated by the retinoic acid (RA) signaling system of the nervous system. The most important mechanism of RA activity is the regulation of gene expression. This is accomplished by its binding to nuclear retinoid receptors that are ligand-activated transcription factors. Thus, RA acts as a transcriptional activator for a large number of other, downstream regulatory molecules, including enzymes, transcription factors, cytokines, and cytokine receptors. Retinoic acid is an essential morphogen in vertebrate development and participates in tissue regeneration in the adult [Jorg M E Y and Peter MdCaffery. Retinoic Acid Signaling in the Nervous System of Adult Vertebrates. The Neuroscientist 10(5, 2004): 409-421, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein]. RA also increases synaptic strength in a homeostatic response (synaptic scaling) to neuronal inactivity through a mechanism involving protein synthesis that requires the participation of TNF-alpha. RA is also intimately involved in the control of the rhythmic electrical activity of the brain. More generally, all-trans retinoic acid, 9-cis retinoic acid, and 13-cis retinoic acid are some of a very small number of entrainment factors that regulate the natural rhythmicity of metabolic processes in many types of individual cells [Mehdi Tafti, Norbert B. Ghyselinck. Functional Implication of the Vitamin A Signaling Pathway in the Brain. Arch Neurol. 64(12, 2007): 1706-1711, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein].
The potentially anti-inflammatory cytokine TGF-beta is a member of the TGF-beta superfamily of neurotrophic factors. Neurotrophic factors serve as growth factors for the development, maintenance, repair, and survival of specific neuronal populations, acting via retrograde signaling from target neurons by paracrine and autocrine mechanisms. Other neurotrophic factors also promote the survival of neurons during neurodegeneration. These include members of the nerve growth factor (NGF) superfamily, the glial-cell-line-derived neurotrophic factor (GDNF) family, the neurokine superfamily, and non-neuronal growth factors such as the insulin-like growth factors (IGF) family. However, major problems in using such neurotrophic factors for therapy are their inability to cross the blood-brain-barrier, adverse effects resulting from binding to the receptor in other organs of the body and their low diffusion rate [Yossef S. Levy, Yossi Gilgun-Sherki, Eldad Melamed and Daniel Offen. Therapeutic Potential of Neurotrophic Factors in Neurodegenerative Diseases. Biodrugs 2005; 19 (2): 97-127, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein].
It is known that vagal nerve stimulation and transcranial magnetic stimulation can increase the levels of at least one neurotrophic factor in the brain, namely, brain-derived neurotrophic factor (BDNF) in the NGF superfamily, which has been studied extensively in connection with the treatment of depression. However, vagal nerve stimulation to increase levels of neurotrophic factors has not been reported in connection with neurodegenerative diseases. Because BDNF may be modulated by stimulating the vagus nerve, vagal nerve stimulation may likewise promote the expression of other neurotrophic factors in patients with neurodegenerative disease, thereby circumventing the problem of blood-brain barrier blockage [Follesa P, Biggio F, Gorini G, Caria S, Talani G, Dazzi L, Puligheddu M, Marrosu F, Biggio G. Vagus nerve stimulation increases norepinephrine concentration and the gene expression of BDNF and bFGF in the rat brain. Brain Research 1179(2007): 28-34, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; Biggio F, Gorini G, Utzeri C, Olla P, Marrosu F, Mocchetti I, Follesa P. Chronic vagus nerve stimulation induces neuronal plasticity in the rat hippocampus. Int J Neuropsychopharmacol. 12(9, 2009):1209-21, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; Roberta Zanardini, Anna Gazzoli, Mariacarla Ventriglia, Jorge Perez, Stefano Bignotti, Paolo Maria Rossini, Massimo Gennarelli, Luisella Bocchio-Chiavetto. Effect of repetitive transcranial magnetic stimulation on serum brain derived neurotrophic factor in drug resistant depressed patients. Journal of Affective Disorders 91 (2006) 83-86, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein]. US Patent Application Publication US20100280562, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein, entitled Biomarkers for monitoring treatment of neuropsychiatric diseases, to P I et al, disclosed the measurement of GDNF and other neurotrophic factors following vagal nerve stimulation. However, that application is concerned with the search for biomarkers involving the levels of GDNF, rather than a method for treating autoimmune diseases using vagal nerve stimulation.
Two types of pathways are shown in
It is understood that the labels in
Furthermore, it is understood that the box labeled “Anti-Inflammatory Cytokine, e.g., TGF-beta” can actually be placed within the box entitled “Neurotrophic Factor”, because TFG-beta is a member of the superfamily of TGF-beta neurotrophic factors [Yossef S. Levy, Yossi Gilgun-Sherki, Eldad Melamed and Daniel Offen. Therapeutic Potential of Neurotrophic Factors in Neurodegenerative Diseases. Biodrugs 2005; 19 (2): 97-127, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein]. However, because TGF-beta is ordinarily referred to simply as a cytokine, and because its anti-inflammatory competence is known to be influenced by retinoic acid, it was placed in a separate box to avoid undue confusion.
The role of the sympathetic nervous system (SNS) in the regulation of the immune system has been long appreciated through the activity of the hypothalamicpituitary-adrenal axis (HPA) and through which corticosteroids (cortisol) and other naturally occurring immunosuppressive compounds are released (Rook, 1999). In parallel with this understanding, beginning in the 1930s and 1940s, it was observed that a splenectomy could provide relief from severe inflammatory conditions such as Rheumatoid arthritis (Bach, 1946). It was a natural extension of these two lines of thinking, therefore, to attempt to modulate the splenic nerve (an element of the SNS) and identify how the immune system was impacted. The effects of stimulating these neural inputs to the spleen began to be reported as early as the 1960s (Davies et al., 1968) (FIG. 132.1).
Besedovsky et al. (1979) described the SNS as playing an important role in a feedback loop that coupled lymphoid organ activity to the CNS. In this model, the efferent arm of the SNS projects to immune system organs, releasing NE from sympathetic nerve terminals in these organs (Elenkov et al., 2000). The role of NE in modulating macrophages and other immune cells in an anti-inflammatory direction has been well established (Hu et al., 1991). Both endogenous, tonic expression, and volume transmission through extrasynaptic means, i.e., varicosities, have been proposed as a means for maintaining a baseline level of suppression over immune activity (Straub et al., 1998). With respect to the afferent arm of this feedback loop, it has been suggested that peripheral cytokine levels are able to modulate the CNS to alter sympathetic outflow. In fact, two separate groups reported, in 1989 and 1991, that infusion of IL-1! or IFN-” into the ventricles of the brain causes rapid, significant reductions in peripheral and splenic immune cell activity (Sundar et al., 1989; Brown et al., 1991). To facilitate this activation within the CNS, afferent vagal fibers were proposed as a functional pathway for peripheral cytokine modulation of the CNS (Maier et al., 1998).
Further evidence of VN involvement with splenic immune function came when Bernik et al. (2001) studied the significant peripheral, anti-inflammatory effects of semapimod (a compound formerly known as CNI-1493), which, at one point, was believed to inhibit inflammation through inhibition of p38 MAP kinase. Minute quantities of semapimod, were administered intracerebro-ventricular (ICV), just as IL-1# and IFN-$ had been used previously. However, unlike the prior thesis of sympathetic pathway involvement, Bernik et al. reversed the assumption of efferent signaling from sympathetic to the parasympathetic (vagus), when it was found that severing of the VN abolished the anti-inflammatory effects. Their conclusion was that semapimod was a potent activator of efferent, vagal outflow (Oke et al., 2007). Borovikova et al. (2000) had previously demonstrated that electrical stimulation of the distal remains of the severed VN, i.e., the efferent vagal component, was able to trigger anti-inflammatory effects, even in the absence of ICV administration of semapimod, IL-1#, or IFN-$. (As will be discussed later, additional studies showed that electrical stimulation of the afferent arms, postvagotomy, were also able to affect the same immune modulation.)
A review of the available literature on this subject strongly suggests that there is broad, albeit not universal, agreement that stimulation of the VN (using appropriate stimulation, signal parameters) generates a splenic nerve-mediated, anti-inflammatory effect. Initial proposals to explain the pathway suggest a simple efferent model that is based solely on acetylcholine release (the primary neurotransmitter released by efferent vagal fibers), whereby direct release of acetylcholine and binding to receptors on macrophages suppresses the production of inflammatory cytokines. The specific, efferent pathway was hypothesized to be through a binding of acetylcholine to the $7-nicotinic, acetylcholine receptor ($7nAChR), since the anti-inflammatory effect of efferent (postvagotomy) stimulation was lost in $7nAChR knockout animals (de Jonge et al., 2007).
In some embodiments, the systemic anti-inflammatory effects of VNS are believed to result from the activation of sympathetic fibers in the splenic nerve, through a connection at the celiac ganglion. These sympathetic fibers release norepinephrine into the spleen in close proximity to a specialized group of immune cells that release acetylcholine, or ACh. This release of ACh activates a receptor, the alpha 7 nicotinic ACh receptor, or α7nAChR, on cytokine-releasing immune cells called macrophages. Activation of these receptors is believed to function by blocking transcription factors that promote inflammatory cytokine expression. Based on the role of ACh in activating this pathway, which is shown in
Myelin is a dielectric material that forms a natural layer (sheath) around the axon of certain neurons. The presence of a myelin sheath increases the speed at which electrical impulses propagate along those axons, through a process known as saltation. Myelin is composed of about 80% lipid (principally galactocerebroside and sphingomyelin) and about 20% protein (principally myelin basic protein, myelin oligodendrocyte glycoprotein, and proteolipid protein). Myelin is formed and maintained by Schwann cells for axons within the peripheral nervous system and by interfascicular oligodendrocytes for axons within the central nervous system.
Demyelination is the loss of myelin sheaths around axons. It is the primary cause of a category of neurodegenerative autoimmune diseases in which the immune system pathologically damages the nervous system by destroying myelin. These demyelinating diseases include multiple sclerosis, acute disseminated encephalomyelitis, transverse myelitis, chronic inflammatory demyelinating polyneuropathy, Guillain-Barré Syndrome, central pontine myelinosis, leukodystrophy, and Charcot Marie Tooth disease. In what follows, methods of treating multiple sclerosis (MS) are disclosed, but it is understood that the disclosure applies also to other demyelinating neurodegenerative diseases.
MS has no generally accepted formal definition, so that a large number of so-called idiopathic inflammatory demyelinating diseases, also known as borderline forms of MS, may also be treated by the disclosed methods, to the extent that autoimmunity is involved in their pathophysiology (e.g., optic-spinal MS, Devic's disease, acute disseminated encephalomyelitis, Balo concentric sclerosis, Schilder disease, Marburg M S, tumefactive MS, pediatric and pubertal MS, and venous MS). To that same extent, the disclosed methods would also apply to dysmyelination disease, viz., diseases involving the formation of defective myelin without the formation of plaques, including leukodystrophies (Pelizaeus-Merzbacher disease, Canavan disease, phenylketonuria) and schizophrenia.
In MS, nerves of the brain and spinal cord not only become demyelinated, but there is also scarring (formation of scleroses, also known as plaques or lesions) of the nervous tissue, particularly in the white matter of the brain and spinal cord, which is mainly composed of myelin. The neurons in white matter carry signals between grey matter areas of the central nervous system (where information processing is performed) and the rest of the body. In MS, the demyelination is found only rarely in the peripheral nervous system [COMPSTON A and Coles A. Multiple sclerosis. Lancet 372 (9648, October 2008): 1502-1517, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein].
The destruction of myelin takes place concomitantly with destruction of the oligodendrocytes that are responsible for the formation and maintenance of myelin sheaths. As the body's own immune system attacks and damages the myelin, myelin sheaths are damaged or lost, and axons can no longer effectively conduct signals. The inability to conduct nerve signals leads to symptoms that correspond to the particular nervous tissue that has been damaged [Kenneth J. SMITH and W. I. McDonald. The pathophysiology of multiple sclerosis: the mechanisms underlying the production of symptoms and the natural history of the disease. Philos Trans R Soc Lond B Biol Sci. 1999 Oct. 29; 354(1390): 1649-1673, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein].
Because the demyelination can occur essentially anywhere in the white matter of the brain and spinal cord, the MS patient can initially exhibit almost any neurological symptom, making an initial diagnosis of MS difficult. Such symptoms include impairment of the central nervous system (fatigue, depression and moodiness, or cognitive dysfunction), visual problems (inflammation of the optic nerve, double vision, or involuntary eye movement), inability to articulate or swallow, muscle problems (weakness, spasm, or lack of coordination), sensation problems (pain, insensitivity, tingling, prickliness, or numbness), bowel problems (constipation, diarrhea, or incontinence), and urinary problems (incontinence, overactive bladder, or retention). In order of frequency, the most common initial MS symptoms are changes in sensation, vision loss, weakness, double vision, unsteady walking, and imbalance. Fifteen percent of MS patients have multiple initial symptoms.
Following the initial symptoms, a period of months to years of remission may elapse. Thereafter, acute periods of relapse may occur, followed by another remission or a gradual deterioration of neurologic function. New symptoms may also arise during each relapse. Progression of the disease is heterogeneous among MS patients, and subtypes of MS are recognized, based upon the regularity of the acute relapse and subsequent remission, the magnitude of the relapse, and the extent to which progressive deterioration occurs between acute relapses. The most common pattern of MS is known as relapsing-remitting MS (RRMS), in which unpredictable acute relapses may sometimes produce little or no lasting symptoms, followed by periods of no change, followed by another relapse, etc. RRMS usually begins with a clinically isolated syndrome (CIS) attack that only suggests MS, which develops into MS in only 30 to 70 percent of CIS patients.
Standard diagnostic tools for MS are neuroimaging, analysis of cerebrospinal fluid, and evoked potentials. The neuroimaging includes the use of MRI to show plaque location. The analysis of cerebrospinal fluid measures factors that would indicate the presence of chronic inflammation. The evoked potentials comprise neural stimulation that seeks to determine the existence of a reduced neural response that would indicate demyelination.
Many potential triggers of MS acute relapses have been examined, but only a few of them are often acknowledged as being likely triggers, such as the season of the year (spring and summer), viral infection, and stress.
Some epidemiological studies have also examined the likelihood that an individual will ever have MS. More than 300 thousand individuals suffer from MS in North America. Worldwide, incidence of MS is significantly higher at locations closer to the north and south poles. Migration studies show that if the exposure to a higher risk environment occurs before the age of 15 years, the migrant assumes the higher risk of the earlier environment. Epidemics of MS have been reported, most notably in the Faroe Islands, but no causative agent has been identified.
The disease onset usually occurs in young adulthood, peaking between the ages of 20 and 30, and it is 1.4 to 3.1 times more common in females than males. Known genetic variations predispose an individual to have MS, with Caucasian populations being at greater risk than Asian or African populations. Although there is a tendency for MS to run in families, only 35% of monozygotic twins both have MS. Some environmental factors also increase the risk of MS, such as decreased exposure to sunlight and infection with the Epstein-Barr virus at a young age. However, there is no set of risk factors that can reliably predict the onset of MS.
It is generally recognized that MS is an autoimmune disease in which T cells of the immune system gain entrance to the brain when the blood-brain barrier (BBB) is compromised, leading to inflammation in the brain and spinal cord. A deficiency in uric acid is implicated in compromise of the BBB, and individuals with elevated uric acid (e.g., gout patients) are at decreased risk of developing MS. The T cells recognize myelin as foreign and attack it, triggering inflammatory processes and stimulating other immune cells and soluble factors such as cytokines and antibodies. Myelinating oligodendrocytes (either mature or derived from stem cells) can repair some of the demyelination, but if the inflammation is prolonged or frequent, the damage eventually becomes unrepairable, and a scarring (sclerosis) accumulates around the demyelinated neurons. Furthermore, the axons of the corresponding neurons may also be damaged, probably by B-Cells of the immune system.
There is no known cure for MS. The current therapeutic practice is to relieve symptoms during and between acute attacks and to attempt to reduce the likelihood of relapses, thereby slowing progression of the disease. Symptomatic treatment involves administration of corticosteroids, such as methylprednisolone, to reduce inflammation during attacks. Other drugs are used to treat the symptoms of spasticity (baclofen, tizanidine, diazepam, clonazepam, dantrolene), optic neuritis (methylprednisolone and oral steroids), fatigue (amantadine, pemoline), pain (codeine), trigeminal neuralgia (carbamazepine), and sexual dysfunction (papaverine for men).
To prevent relapses, the following drugs are currently used: Interferon beta-1a, interferon beta-1b, glatiramer acetate, mitoxantrone, and natalizumab. These interferons are anti-viral proteins that may suppress the immune system. Mitoxantrone is also an immunosuppressant that suppresses the proliferation of T cells and B cells. Natalizumab is a monoclonal antibody that blocks the ability of inflammatory immune cells to attach to and pass through the cell layers lining the blood-brain barrier, by binding to the cellular adhesion molecule a4-integrin. Glatiramer acetate is an immunomodulator drug that shifts the population of T cells from pro-inflammatory Th1 cells to regulatory Th2 cells, by virtue of its resemblance to myelin basic protein. Each of these drugs produces significant side effects. For example, glatiramer acetate and the interferon treatments produce irritation at the injection site. Interferons also produce flu-like symptoms and may cause liver damage. Mitoxantrone may cause cardiotoxicity. Natalizumab may cause multifocal leukoencephalopathy.
Experimental treatments for MS include plasma exchange, bone marrow transplantation, potassium channel blockers to improve the conduction of nerve impulses, the inducement of an immune attack against myelin-destroying T cells (vaccination and peptide therapy), protein antigen feeding to release the protective cytokine TGF-beta, administration of TGF-beta, use of monoclonal antibodies to promote remyelination, and various dietary therapies. Many such experimental treatments are motivated by experiments using an animal model of brain inflammation diseases including MS, namely, experimental allergic encephalomyelitis (EAE) [HAFLER DA, Kent S C, Pietrusewicz M J, Khoury S J, Weiner H L and Fukaura H. Oral administration of myelin induces antigen-specific TGF-beta 1 secreting T cells in patients with multiple sclerosis. Ann N Y Acad Sci 1997; 56:120-131, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; MIRSHAFIEY A, Mohsenzadegan M. TGF-beta as a promising option in the treatment of multiple sclerosis. Neuropharmacology 56(6-7, 2009):929-36, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein].
To date, some electrical stimulation therapies have stimulated nerves of MS patients other than the vagus nerve, primarily to treat symptoms such as urinary incontinence and spasticity [KRAUSE P, Szecsi J, Straube A. FES cycling reduces spastic muscle tone in a patient with multiple sclerosis. NeuroRehabilitation. 2007; 22(4):335-7, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; P. KETELAER, G. Swartenbroekx, P. Deltenre, H. Carton and J. Gybels. Percutaneous epidural dorsal cord stimulation in multiple sclerosis. Acta Neurochirurgica 49 (1979): 95-101, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; L. S. ILLIS and E. M. Sedgwick. Dorsal column stimulation in multiple sclerosis. Br Med J. (1980 Aug. 16); 281(6238): 518, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein]. Some electrical stimulation of the vagus nerve of MS patients has been reported in connection with treatment of tremor and dysphagia [F. MARROSU, A. Maleci, E. Cocco, M. Puligheddu, and M. G. Marrosu. Vagal nerve stimulation effects on cerebellar tremor in multiple sclerosis. Neurology 65 (2005): 490, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; F MARROSU, A Maleci, E Cocco, M Puligheddu, L Barberini and M G Marrosu. Vagal nerve stimulation improves cerebellar tremor and dysphagia in multiple sclerosis. Multiple Sclerosis 2007; 13: 1200-1202, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein].
US Patent Application Publication 2004/0249416, entitled Treatment of conditions through electrical modulation of the autonomic nervous system, to YUN et al. the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein, mentions treatment of multiple sclerosis within a long list of diseases, in connection with stimulation of the vagus and other nerves. However, it makes no mention of modulating the activity of cytokines or neurotrophic factors.
U.S. Pat. Nos. 6,610,713 and 6,838,471, entitled Inhibition of inflammatory cytokine production by cholinergic agonists and vagus nerve stimulation, to TRACEY, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein, mention treatment of multiple sclerosis within a long list of diseases, in connection with the treatment of inflammation through stimulation of the vagus nerve. According to those patents, “Inflammation and other deleterious conditions . . . are often induced by proinflammatory cytokines, such as tumor necrosis factor (TNF; also known as TNF.alpha. or cachectin) . . . .” The patents goes on to state that “Proinflammatory cytokines are to be distinguished from anti-inflammatory cytokines, . . . , which are not mediators of inflammation.” It is clear from those patents that their objective is only to suppress the release of proinflammatory cytokines, such as TNF-alpha. There is no mention or suggestion that the method is intended to stimulate the release of anti-inflammatory cytokines, and in fact the text quoted above disclaims a role for anti-inflammatory cytokines as mediators of inflammation. Those patents make a generally unjustified dichotomy between pro- and anti-inflammatory cytokines, by indicating that a cytokine could be one or the other but not both. In particular, the patents make no mention of the cytokine TGF-beta, and there is no suggestion that the role of a cytokine in regards to its pro- or anti-inflammation competence may be inherently indeterminate or indefinite unless more information is provided about the presumed physiological environment in which the cytokine finds itself.
Treatment of multiple sclerosis is also mentioned within long lists of diseases in the following related applications to TRACEY and his colleague HUSTON, wherein stimulation of the vagus nerve is intended to suppress the release of proinflammatory cytokines such as TNF-alpha: US20060178703, entitled Treating inflammatory disorders by electrical vagus nerve stimulation, to HUSTON et al., the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; US20050125044, entitled Inhibition of inflammatory cytokine production by cholinergic agonists and vagus nerve stimulation, to TRACEY, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; US20080249439, entitled Treatment of inflammation by non-invasive stimulation to TRACEY et al., the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; US20090143831, entitled Treating inflammatory disorders by stimulation of the cholinergic anti-inflammatory pathway, to HUSTON et al, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; US 20090248097, entitled Inhibition of inflammatory cytokine production by cholinergic agonists and vagus nerve stimulation, to TRACEY et al, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein. The same observations made above in connection with U.S. Pat. Nos. 6,610,713 and 6,838,471 apply to those applications as well the disclosure of which are incorporated herein by reference for all purposes as if copied and pasted herein.
In some embodiments, methods are used for vagal nerve stimulation to suppress inflammation. However, unlike the patents and applications to TRACEY and to HUSTON, these methods involve a use of vagal nerve stimulation to increase the concentration or effectiveness of anti-inflammatory cytokines. TRACEY et al do not consider the modulation of anti-inflammatory cytokines to be part of the cholinergic anti-inflammatory pathway that their method of vagal nerve stimulation is intended to activate. Thus, they explain that “activation of vagus nerve cholinergic signaling inhibits TNF (tumor necrosis factor) and other proinflammatory cytokine overproduction through ‘immune’ a7 nicotinic receptor-mediated mechanisms” [V.A. PAVLOV and K. J. Tracey. Controlling inflammation: the cholinergic anti-inflammatory pathway. Biochemical Society Transactions 34, (2006, 6): 1037-1040, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein]. In contrast, anti-inflammatory cytokines are said to be part of a different “diffusible anti-inflammatory network, which includes glucocorticoids, anti-inflammatory cytokines, and other humoral mediators” [CZURA CJ, Tracey K J. Autonomic neural regulation of immunity. J Intern Med. 257(2005, 2): 156-66, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein]. Their disclaiming of a role for anti-inflammatory cytokines as mediators of inflammation following stimulation of the vagus nerve may be due to a recognition that anti-inflammatory cytokines (e.g. TGF-ß) are produced constitutively while pro-inflammatory cytokines (e.g., TNF-alpha) are not, but are instead induced. However, anti-inflammatory cytokines are inducible as well as constitutive, so that for example, an increase in the concentrations of potentially anti-inflammatory cytokines such as transforming growth factor-beta (TGF-ß) can in fact be accomplished through stimulation of the vagus nerve [RA BAUMGARTNER, Va. Deramo and MA Beaven. Constitutive and inducible mechanisms for synthesis and release of cytokines in immune cell lines. The Journal of Immunology 157 (1996, 9): 4087-4093, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; CORCORAN, Ciaran; Connor, Thomas J; O'Keane, Veronica; Garland, Malcolm R. The effects of vagus nerve stimulation on pro- and anti-inflammatory cytokines in humans: a preliminary report. Neuroimmunomodulation 12 (5, 2005): 307-309, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein].
In MS, a strategy of inhibiting pro-inflammatory cytokines rather than enhancing anti-inflammatory cytokines might even be counterproductive. Thus, blocking TNF-alpha with the drug lenercept promotes and exacerbates MS attacks rather than delaying them, which might be attributable in part to the fact that TNF-alpha promotes remyelination and the proliferation of oligodendrocytes that perform the myelination. [ANONYMOUS. TNF neutralization in MS: Results of a randomized, placebo controlled multicenter study. Neurology 1999, 53:457, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; ARNETT HA, Mason J, Marino M, Suzuki K, Matsushima G K, Ting J P. TNF alpha promotes proliferation of oligodendrocyte progenitors and remyelination. Nat Neurosci 2001, 4:1116-1122, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein].
TGF-ß is currently used as an experimental treatment for multiple sclerosis [MIRSHAFIEY A, Mohsenzadegan M.TGF-beta as a promising option in the treatment of multiple sclerosis. Neuropharmacology. 56 (2009, 6-7): 929-36, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein]. In the method disclosed herein, it is applied directly as a drug, indirectly through stimulation of the vagus nerve without pharmacological administration to the patient, or both directly and indirectly.
TGF-ß converts undifferentiated T cells into regulatory T (Treg) cells that block autoimmunity. However, in presence of interleukin-6, TGF-ß also causes the differentiation of T lymphocytes into proinflammatory IL-17 cytokine-producing T helper 17 (TH17) cells, which promote autoimmunity and inflammation. Thus, it is conceivable that an increase of TGF-ß levels might actually cause or exacerbate inflammation, rather than suppress it. Accordingly, a step in the method that is disclosed here is to deter TGF-ß from realizing its pro-inflammatory potential, by selecting electrical stimulation parameters that bias the potential of TGF-ß towards anti-inflammation, and/or by treating the patient with an agent such as the vitamin A metabolite retinoic acid that is known to promote such an anti-inflammatory bias [MUCIDA D, Park Y, Kim G, Turovskaya O, Scott I, Kronenberg M, Cheroutre H. Reciprocal T H17 and regulatory T cell differentiation mediated by retinoic acid. Science 317(2007, 5835): 256-60, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; Sheng XIAO, Hulin Jin, Thomas Korn, Sue M. Liu, Mohamed Oukka, Bing Lim, and Vijay K. Kuchroo. Retinoic acid increases Foxp3+ regulatory T cells and inhibits development of Th17 cells by enhancing TGF-ß-driven Smad3 signaling and inhibiting IL-6 and IL-23 receptor expression. J Immunol. 181(2008, 4): 2277-2284, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein].
In some embodiments, endogenous retinoic acid that is produced and released by neurons themselves is used to produce the anti-inflammatory bias. Thus, it may be known that vagal nerve stimulation may induce differentiation through release of retinoic acid that is produced in neurons from retinaldehyde by retinaldehyde dehydrogenases, and some embodiments to induce anti-inflammatory regulatory T cell (Treg) differentiation by this type of mechanism [van de PAVERT SA, Olivier B J, Goverse G, Vondenhoff M F, Greuter M, Beke P, Kusser K, Höpken UE, Lipp M, Niederreither K, Blomhoff R, Sitnik K, Agace W W, Randall T D, de Jonge W J, Mebius R E. Chemokine CXCL13 is essential for lymph node initiation and is induced by retinoic acid and neuronal stimulation. Nat Immunol. 2009 November; 10(11):1193-9, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein]. It is understood that the methods that are disclosed here in connection with the treatment of MS may be applied to the treatment of other diseases that involve inflammation, such as post-operative ileus.
Thus, some embodiments comprise a pro-anti-inflammatory mechanism because it biases the competence of TGF-beta towards that of an anti-inflammatory cytokine. An increase in the concentrations of potentially anti-inflammatory cytokines such as TGF-ß can also be accomplished through stimulation of the vagus nerve, which is also a pro-anti-inflammatory mechanism when TGF-ß is biases towards anti-inflammation [CORCORAN, Ciaran; Connor, Thomas J; O'Keane, Veronica; Garland, Malcolm R. The effects of vagus nerve stimulation on pro- and anti-inflammatory cytokines in humans: a preliminary report. Neuroimmunomodulation 12 (5, 2005): 307-309, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein]. As mentioned above, inhibiting the pro-inflammatory cytokine TNF-alpha is considered to be counterproductive in MS patients, there may be circumstances in which the inhibition of other pro-inflammatory cytokines may be useful therapeutically. In that case, stimulation of the vagus nerve in an attempt to produce the anti-pro-inflammatory response advocated by TRACEY and colleagues may be attempted. However, an anti-pro-inflammatory response may be produced by another mechanism involving stimulation of the vagus nerve, because as indicated above, vagal nerve stimulation may result in the release of retinoic acid, and the retinoic acid itself inhibits pro-inflammatory cytokines [Malcolm Maden. Retinoic acid in the development, regeneration and maintenance of the nervous system. Nature Reviews Neuroscience 8(2007), 755-765, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein].
The potentially anti-inflammatory cytokine TGF-beta is a member of the TGF-beta superfamily of neurotrophic factors. Neurotrophic factors serve as growth factors for the development, maintenance, repair, and survival of specific neuronal populations, acting via retrograde signaling from target neurons by paracrine and autocrine mechanisms. Other neurotrophic factors also promote the survival of neurons during neurodegeneration. These include members of the nerve growth factor (NGF) superfamily, the glial-cell-line-derived neurotrophic factor (GDNF) family, the neurokine superfamily, and non-neuronal growth factors such as the insulin-like growth factors (IGF) family. However, major problems in using such neurotrophic factors for therapy are their inability to cross the blood-brain-barrier, adverse effects resulting from binding to the receptor in other organs of the body and their low diffusion rate [Yossef S. Levy, Yossi Gilgun-Sherki, Eldad Melamed and Daniel Offen. Therapeutic Potential of Neurotrophic Factors in Neurodegenerative Diseases. Biodrugs 2005; 19 (2): 97-127, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein].
In some instances, it is known that vagal nerve stimulation and transcranial magnetic stimulation can increase the levels of at least one neurotrophic factor in the brain, brain-derived neurotrophic factor (BDNF), which has been studied extensively in connection with the treatment of depression [Follesa P, Biggio F, Gorini G, Caria S, Talani G, Dazzi L, Puligheddu M, Marrosu F, Biggio G. Vagus nerve stimulation increases norepinephrine concentration and the gene expression of BDNF and bFGF in the rat brain. Brain Research 1179 (2007): 28-34; Biggio F, Gorini G, Utzeri C, Olla P, Marrosu F, Mocchetti I, Follesa P. Chronic vagus nerve stimulation induces neuronal plasticity in the rat hippocampus. Int J Neuropsychopharmacol. 12(9, 2009):1209-21, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; Roberta Zanardini, Anna Gazzoli, Mariacarla Ventriglia, Jorge Perez, Stefano Bignotti, Paolo Maria Rossini, Massimo Gennarelli, Luisella Bocchio-Chiavetto. Effect of repetitive transcranial magnetic stimulation on serum brain derived neurotrophic factor in drug resistant depressed patients. Journal of Affective Disorders 91 (2006) 83-86, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein]. In some embodiments, it has never been proposed before this disclosure that vagal nerve stimulation may be utilized to increase BDNF levels in MS patients. BDNF is known to reduce clinical inflammation and cell death in an animal model of MS [Makar T K, Trisler D, Sura K T, Sultana S, Patel N, Bever C T. Brain derived neurotrophic factor treatment reduces inflammation and apoptosis in experimental allergic encephalomyelitis. J Neurol Sci. 270(1-2, 2008):70-6, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein]. Vagal nerve stimulation may likewise promote the expression of other beneficial neurotrophic factors as well, which circumvents the problem of blood-brain barrier blockage by being induced through vagal nerve stimulation. US Patent Application Publication 20100280562, entitled Biomarkers for monitoring treatment of neuropsychiatric diseases, to P I et al, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein disclosed the measurement of BDNF following vagal nerve stimulation. However, that application is concerned with the search for biomarkers involving the levels of BDNF, rather than a method for treating a neurodegenerative disease using vagal nerve stimulation.
The foregoing review of MS disclosed at least four novel mechanisms by which stimulation of the vagus nerve may be used to treat MS: (1) stimulate the vagus nerve in such a way as to enhance the availability or effectiveness of TGF-beta or other anti-inflammatory cytokines; (2) stimulate the vagus nerve in such a way as to enhance the availability or effectiveness of retinoic acid; (3) stimulate the vagus nerve in such a way as to suppress the release or effectiveness of pro-inflammatory cytokines, through a mechanism that is distinct from the one proposed by TRACEY and colleagues; (4) stimulate the vagus nerve in such a way as to promote the expression of the neurotrophic factors such as BDNF.
In some embodiments, some patients may be co-treated with all-trans retinoic acid (ATRA), wherein oral retinoic acid is first administered at a dose of 0.1 to 200 mg/sq. m, typically 20 mg/sq. m. If retinoic acid syndrome or other side effects are not observed in the patient, ATRA is thereafter administered daily until vagal nerve stimulation is performed, typically after one week of ATRA administration and no more than about 45 days of ATRA administration. It is understood that other retinoids, such as 9-cis-retinoic acid and 13-cis-retinoic acid, and any other agent that biases TGF-ß towards its anti-inflammatory potential, may be substituted for ATRA, and that if side effects are found, a reduced dose may be administered [ADAMSON, P. C., Bailey, J., Pluda, J., Poplack, D. G., Bauza, S., Murphy, R. F., Yarchoan, R., and Balis, F. M. Pharmacokinetics of all-trans-retinoic acid administered on an intermittent schedule. J. Clin. Oncol., 13: 1238-1241, 1995, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein].
In some embodiments, vagal nerve stimulation itself promotes release of neuron-synthesized retinoic acid, thereby inducing the differentiation undifferentiated T cells into anti-inflammatory regulatory T cells (Treg) in the presence of the cytokineTGF-beta. In some embodiments, both endogenous (induced by vagal nerve stimulation) and exogenous retinoic acid (administered as a drug) are used to induce differentiation of undifferentiated T cells into regulatory T (Treg) cells. In some embodiments, TGF-beta itself may be induced by the vagal nerve stimulation, the release of proinflammatory cytokines such as TNF-alpha may be blocked by the vagal nerve stimulation, and neurotrophic factors such as BDNF may be induced by the vagal nerve stimulation.
In some embodiments of treating MS, the method stimulates the vagus nerve as described above, using the stimulation devices that are disclosed herein. The position and angular orientation of the device are adjusted about that location until the patient perceives stimulation when current is passed through the electrodes. The applied current is increased gradually, first to a level wherein the patient feels sensation from the stimulation. The power is then increased, but is set to a level that is less than one at which the patient first indicates any discomfort. Straps, harnesses, or frames may be used to maintain the stimulator in position (not shown in
Typically, the treatment is performed repeatedly, e.g., multiple times per day for 1-6 months or throughout a period of remission. However, parameters of the stimulation may be varied in order to obtain a beneficial response, as described above in the various treatment paradigms. For example, levels and/or activities of TGF-ß or other anti-inflammatory cytokines, pro-inflammatory cytokines, and/or neurotrophic factors such as BDNF in the patient's peripheral circulation and/or in the patient's cerebrospinal fluid can be measured, before, during and subsequent to each treatment. A beneficial response may also be determined through use of standard diagnostic tools for MS, including neuroimaging, analysis of cerebrospinal fluid, and evoked potentials. The treatment is primarily intended to prevent MS relapses during remission, but it may also be administered to patients while a MS relapse is in progress, so as to hasten entry into remission.
Sjôgren's syndrome is a chronic inflammatory condition characterized by damage to, and ultimate loss of, moisture-producing glands. Some clinical consequence of this damage is dry mouth and dry eyes, which can cause significant tooth loss and ocular injury. Related similar symptoms can include dry skin, a chronic cough, and vaginal dryness. Primary Sjôgren's syndrome, defined as being independent of other rheumatologic conditions, affects approximately 600,000 people in the United States, primarily women. Secondary Sjôgren's syndrome arises in conjunction with other inflammatory conditions, and increases the number of Sjôgren's sufferers to approximately four million people in the United States.
It is believed that the disease begins with increased inflammatory cytokine levels of interleukin-1 beta, or IL-1ß. The elevated level of IL-1ß is believed to be the underlying cause of the debilitating fatigue and sleepiness, symptoms that are often the cause of the greatest loss in quality of life among Sjôgren's patients. This fatigue is a symptom of what is referred to as cytokine-induced sickness behavior.
Sickness behavior is a coordinated set of behavioral changes associated with extended periods of inflammation, including inability to concentrate, lethargy, malaise, fatigue, sleepiness, hyperalgesia, depression, and anxiety. These symptoms are common across many conditions in rheumatology.
In some embodiments of treating Sjôgren's syndrome, a method stimulates the vagus nerve as described above, using the stimulation devices that are disclosed herein. The position and angular orientation of the device are adjusted about that location until the patient perceives stimulation when current is passed through the electrodes. The applied current is increased gradually, first to a level wherein the patient feels sensation from the stimulation. The power is then increased, but is set to a level that is less than one at which the patient first indicates any discomfort. The stimulator signal may have a frequency and other parameters that are selected to influence the therapeutic result. For example, a pulse width may be from about 0.01 ms to 500.0 ms, typically 200 ms. The pulses may be delivered at a frequency of 0.5 to 500 Hz, typically 20 Hz. Each stimulation dose may be performed for 30 seconds to 5 minutes, typically for about 60-120 seconds.
Typically, the treatment is performed repeatedly, e.g., multiple times per day for 1-6 months or longer. However, parameters of the stimulation may be varied in order to obtain a beneficial response, as described above in the various treatment paradigms. For example, levels and/or activities of ACh, interleukin-1 beta or IL-1ß or other pro-inflammatory cytokines, anti-inflammatory cytokines, in the patient's peripheral circulation and/or in the patient's cerebrospinal fluid can be measured, before, during and subsequent to each treatment. In addition, some, most, many, or all activities of the α7nAChR, receptor on cytokine-releasing immune cells or macrophages may also be measured. A beneficial response may also be determined through use of standard diagnostic tools for Sjôgren's syndrome, including measuring the debilitating fatigue and sleepiness that are believed to be caused by elevated levels of IL-1 ß. The treatment can be primarily intended to reduce inflammation and improve at least some of the symptoms of Srogren's Syndrome, including the inability to concentrate, lethargy, malaise, fatigue, sleepiness, hyperalgesia, depression, and anxiety
An initial open label pilot trial of non-invasive vagal nerve stimulation (nVNS) for the treatment of primary Sjôgren's syndrome was funded by the U. K. Arthritis Foundation, the results of which were recently presented at the 2017 American College of Rheumatology annual meeting. This trial enrolled 15 patients, all of whom provided evaluable data. At the beginning of this trial, enrolled patients provided baseline self-assessments of multiple key symptoms of their condition and blood samples were taken to establish baseline cytokine and other biomarker expression levels. During this first visit, patients were treated with nVNS and additional blood samples were taken 90 minutes after this initial treatment. Patients were instructed to self-administer nVNS twice daily, each treatment comprising two doses. Patients returned after seven days to provide self-assessments and additional blood samples. Patients continued this treatment protocol through a total of 26 days. On day 28, after a two-day treatment hiatus, patients provided self-assessments of their symptoms and additional blood samples both before, and 90 minutes following a final nVNS treatment.
Cytokine levels of both IL-1ß and TNF-α were significantly reduced from timepoint 1, or baseline, to timepoint 2, 90 minutes following their first treatment with nVNS. The levels of these cytokines remained at these reduced levels, or lower, at timepoint 3, which was their day seven visit, and timepoints 4 and 5, both of which occurred at their day 28 visit (both before and after their final nVNS treatments).
The clinical results from this open-label pilot trial demonstrated statistical significance for reductions in physical fatigue and sleepiness, and trends toward significance for mental fatigue and abnormal fatigue. As discussed above, systemic anti-inflammatory effects of nVNS are believed to result from the activation of sympathetic fibers that release norepinephrine into the spleen in close proximity to a specialized group of immune cells that release ACh. This release of ACh activates the α7nAChR receptor on macrophages, thereby blocking transcription factors that promote inflammatory cytokine expression.
Rheumatoid arthritis, or RA, is a chronic autoimmune disorder primarily affecting joints, and in particular the synovial tissue within the joint capsule. The condition is characterized by observable inflammation in the synovial tissue of affected joints, with associated warmth, swelling, pain, and loss of function around the inflammation. Symptoms typically worsen following rest. The most commonly affected areas include smaller joints of the body such as the wrists, hands, and feet, and typically affects the same joints on both sides of the body.
Uncontrolled R A is associated with significant morbidity and increased mortality. The current standard of care involves treating patients early and aggressively to prevent, or significantly retard the progression of joint damage. This is important, as progression of joint damage is directly correlated with debility, disability and loss of function. Approximately 2.4 million patients, predominantly women, suffer from RA in the United States. Current treatments for RA have been shown to possess a disease modifying effect, in addition to being effective at controlling signs and symptoms. Some agents used in the treatment of RA, most notably the biologics have shown effectiveness in the treatment of psoriatic arthritis and ankylosing spondylitis.
Inflammatory cytokines have long been identified in the pathogenesis of RA. Medications that inhibit immune activity, either broadly, like corticosteroids, or biologic agents, specifically targeting individual cytokines, have been key treatment options for RA patients. Typically, patients with RA initiate treatment with methotrexate, or MTX, which is sufficient to arrest the disease progression and provide relief of the disabling symptoms in approximately 25% of the affected population. Despite being generically available, the average cost of chronic MTX treatment in the United States still averages greater than $200 per month.
Incomplete response to MTX requires additional therapy, typically in the form of a biologic treatment, the most common of which are antibodies or antibody-like proteins that bind to TNF-α. By targeting TNF-α, these treatments alter the normal functioning of the immune system, and as such carry significant risks related to opportunistic infections and several forms of cancers. Approximately 40% of patients with RA are successfully treated with this class of medications, but at an average cost of $30,000 per year. Estimates suggest that of the more than $30 billion of annual global sales of these medications, sales for RA and related conditions of ankylosing spondylitis and psoriatic arthritis exceed $15 billion.
Those patients who are inadequately managed by MTX and/or anti-TNF-α agents, typically advance to other biologic agents that attempt to either block the circulating levels of other target inflammatory cytokines, or block the intracellular pathways that promote the production of inflammatory cytokines. The latter includes the Janus kinase inhibitors, such as Xeljanz, which have an annual cost currently ranging from $40,000 to over $60,000.
Initial clinical evidence for the use of VNS in RA in an open label pilot trial of implanted VNS among a group of 17 RA patients who had failed standard of care therapy (7 MTX incomplete responders and 10 who had failed at least two biologic agents). The results of this trial demonstrated clinical improvement in disease activity score, or DAS28, over a six-week period of about 2.5 points in MTX incomplete responders and about 1.5 points in biologic failures greater than 1.5 points. Patients had their VNS therapy deactivated for a two-week period following the initial six-week treatment period, during which time DAS28 scores rapidly returned to prior activity levels. This trend reversed and trended towards improvement when VNS therapy was re-initiated.
In some embodiments of treating RA, a method stimulates the vagus nerve as described above, using the stimulation devices that are disclosed herein. The stimulator signal may have a frequency and other parameters that are selected to influence the therapeutic result. For example, a pulse width may be from about 0.01 ms to 500.0 ms, typically 200 ms. The pulses may be delivered at a frequency of 0.5 to 500 Hz, typically 20 Hz. Each stimulation dose may be performed for 30 seconds to 5 minutes, typically for about 60-120 seconds.
Typically, the treatment is performed repeatedly, e.g., multiple times per day for 1-6 months or longer. However, parameters of the stimulation may be varied in order to obtain a beneficial response, as described above in the various treatment paradigms. For example, levels and/or activities of ACh, interleukin-1 beta or IL-1ß or other pro-inflammatory cytokines, anti-inflammatory cytokines, in the patient's peripheral circulation and/or in the patient's cerebrospinal fluid can be measured, before, during and subsequent to each treatment. In addition, activities of the α7nAChR, receptor on cytokine-releasing immune cells or macrophages may also be measured. A beneficial response may also be determined through use of standard diagnostic tools for RA, including measuring inflammation in the synovial tissue of affected joints. The treatment is primarily intended to reduce inflammation and improve at least some of the symptoms of RA, including swelling, pain and loss of function in the affected joints.
Invasive stimulation of the 10th cranial nerve (vagus nerve) has demonstrated a beneficial effect in patients with elevated, body mass indices (BMI) and glucose intolerance/insulin resistance (Shikora et al., 2013; Ju et al., 2014; Huang et al., 2014; Sanmiguel et al., 2009; Policker et al., 2009). A review of the scientific literature provides at least two key lines of research that may explain how vagus nerve stimulation (VNS) impacts metabolic processes and control. First, VNS modulates inflammatory signaling pathways in immune cells (e.g., macrophages), which counters the inhibitory effects of inflammation products that inhibit insulin-mediated, glucose transport in other cells (e.g., muscle cells and adipocytes). Second, VNS promotes the conversion of glucose into glycogen by upregulating the activity of glycogen synthetase in hepatic stellate cells, countering the promotion of gluconeogenesis by inflammatory cytokines.
More specifically, with respect to the former research, it is widely understood that excessive white adipose tissue (WAT) mass is associated with high levels of free fatty acids, which can activate cell surface, antigen-binding receptors referred to as Toll-like receptors (TLRs). Activation of TLRs promotes an innate immune response and expression of inflammatory cytokines that results in influx and activation of immune cells. In fact, excessive WAT can be populated with significant numbers of activated macrophages (Weisberg et al., 2003). These activated macrophages can potentiate and perpetuate a chronic inflammatory state (Tanti et al., 2013).
The inflammatory cascade, if left unchecked, can accelerate in a positive feedback process which can severely damage or destroy the host organism. As a
result, prolonged inflammation is regulated to a chronic stable level by feedback inhibitory proteins designed to slow or block the cellular processes that produce cytokines and other aspects of the inflammatory cascade. In the event that the inflammation trigger is resolved or removed by the immune system, these feedback inhibitory proteins help to bring the inflammatory process to a close, including the self-limiting expression of the inhibitory proteins themselves.
Chronic inflammation related to obesity, however, has no resolution that is mediated by the immune system.
Chronic inflammation thus has been implicated in chronically high levels of expression of these feedback regulatory proteins as they attempt to prevent the positive feedback loop of inflammation from damaging the host. Among these feedback inhibitors of inflammation is the protein class known as Suppressors of Cytokine Signaling (SOCS) (Ronn et al., 2007). Several of these SOCS proteins have functions that lead directly to insulin resistance as they inhibit the signaling pathway of the insulin receptor (IR) (Tanti et al., 2013; Ronn et al., 2007). It has been proposed that a purpose for this inhibition of insulin signaling is to reduce the competition for circulating glucose for immune cell function (which does not require insulin for glucose uptake) (Straub, 2014). Insulin resistance is a hallmark of Type 2 Diabetes (T2D). VNS has been shown to suppress inflammation, especially inflammation initiated by TLR activation (Borovikova et al., 2000; Tracey, 2002). Several clinical study reports provide encouraging data that appear to support the pursuit of VNS for T2D (Shikora et al., 2013; Ju et al., 2014; Huang et al., 2014; Sanmiguel et al., 2009; Policker et al., 2009). Barriers to entry for the use of VNS have centered on its need for surgery (i.e., costs and risks). The development of noninvasive VNS (nVNS) devices however, overcomes these barriers and presents the potential for nVNS to be used as a brief, daily therapy for the management of insulin resistance.
Large deposits of WAT recruit macrophages, with high concentrations of fatty acids leading to inflammatory polarizations of both adipose and immune cells (Th1 T-cells and M1 polarized macrophages). The inflammatory state of these cells alters the behavior of hepatocytes. The presence of chronic inflammation in these cell leads to expression of SOCS1 and SOCS3, which are, as stated previously, the feedback, inhibitory proteins battling to suppress inflammation. These proteins, however, have the additional effect of suppressing insulin sensitivity and thus permitting the inhibition of glycogen synthetase. Countering this proinflammatory state are both ACh (through parasympathetic outflow) and Th2 T-cells and M2 macrophages that promote an anti-inflammatory state.
Experience with corticosteroids, however, would suggest that anti-inflammatory mediators against macrophage activity would not be desirable among diabetic patients, however, as they can be associated with significant increases in circulating glucose levels (often witnessed in the postoperative state). It is likely that the deleterious effects of corticosteroids on glucose output is, however, the result of their mechanism of action, which includes the enhanced expression of SOCS proteins. Mechanisms that promote this anti-inflammatory state, or counter inflammation through pathways that are independent of, or even reduce SOCS1 and SOCS3 expression, may provide benefit in inhibiting the development of, or countering the effects of insulin resistance.
In 2000, it was reported that stimulation of the efferent pathways of the vagus nerve could reduce cytokine expression in a lipopolysaccharide (LPS)-mediated, sepsis model (Borovikova et al., 2000). While various models have been used to confirm the existence of this broadly effective, anti-inflammatory phenomenon, conflicting explanations of the neuroimmune pathways mediating this effect persist in the literature. Initial proposals to explain the pathway suggested a simple model in which efferent, vagal fibers directly released ACh onto immune cells, suppressing their production of cytokines.
The currently prevailing model (although not universally accepted) to explain the phenomenon of the vagally mediated, anti-inflammatory effect of parasympathetic stimulation (Tracey, 2016) is that efferent vagal action potentials cause release of acetylcholine in the celiac ganglion, which causes the release of norepinephrine (NE) from the synapses of the splenic nerve that innervates the spleen. Co-located with the sympathetic fibers are resident effector T-cells that release ACh in the vicinity of activated macrophages. This Ach binds to and activates surface “7nACh receptors on the macrophages, which initiates a cascade that regulates the JAK/STAT, inflammatory pathway (de Jonge et al., 2005).
More importantly, the effect of NE on CD4+CD25− naïve T-cells is to promote differentiation into Th1, Th2, and Th17 cells, with the specific pathway being dependent on local cytokine expression. As previously stated, Th2 cells are strongly antiinflammatory, controlling macrophage cytokine production through the production and release of IL-4 and IL-10. Differentiation into Th2 T-cells is strongly promoted in a low IL-4 environment, which exists in a pro-inflammatory state. In this state, macrophages have been activated into an M1 polarization, for example, when LPS or when LPS or other pro-inflammatory mediators bind to the TLR.
A use of VNS as a treatment for insulin resistance in Type 2 diabetics has been studied using multiple device designs. Clinical study reports of the VBLOC (Enteromedics, US) in the United States, and the Tantalus (MetaCure, Israel) in Europe have been published. The VBLOC therapeutic device from Enteromedics gained a US, FDA approval for the treatment of obesity with VNS, based on a large randomized study of obese patients. MetaCure has conducted two studies, a pilot study (Sanmiguel et al., 2009) and a larger open label study (Policker et al., 2009) in which levels of HbA1c and BP are reported. In the pilot study (Sanmiguel), 11 patients' HbA1c levels dropped from 8.5% to 7.6% within 6 months. In a retrospective study of 50 implanted patients (Policker), the 6-month drop in HbA1c was reported to be from 8.4% to 7.3%, and as with the Shikora results, a regression analysis showed a 0.4% drop per 1% above 7% at baseline. It should be noted that this form of gastric electric stimulation (GES) is known to stimulate the vagus nerve (Peles, 2003).
T2D is a condition marked by, among other things, impaired insulin sensitivity, elevated demand for insulin and excessive levels of circulating glucose. Insulin is a critical component of the body's capability to maintain homeostasis with respect to glucometabolism. It functions in adipose and muscle tissue to enable glucose uptake from circulation. It enables glycogen production in both muscle and liver tissue by disabling proteins that phosphorylate glycogen synthetase, reducing its efficiency. IR function is disabled by proteins that are associated with the feedback inhibition of inflammation called SOCS proteins. Prolonged inflammation, therefore, can distort metabolic function. In addition, obesity can be the source of chronic inflammatory pressure, resulting from perpetual activation of innate immune pathways by locally elevated, free fatty acid levels. VNS has the robust ability to reduce inflammatory cytokine production, and to shift immune cells into an active but anti-inflammatory state. Correspondingly, long-term changes in glucose metabolism have been shown in diabetic patients who have received VNS. Additional evidence of a direct effect of ACh on hepatocytes and the very rapid effects of VNS on lowering glucose output from the liver (also through activation of glycogen synthetase) suggest a direct, i.e., nonimmune regulated, effect of VNS on glucose. Clinical evidence, albeit preliminary, suggests significant potential for VNS in the management of T2D.
In some embodiments of treating T2D, a method stimulates the vagus nerve as described above, using the stimulation devices that are disclosed herein. The stimulator signal may have a frequency and other parameters that are selected to influence the therapeutic result. For example, a pulse width may be from about 0.01 ms to 500.0 ms, typically 200 ms. The pulses may be delivered at a frequency of 0.5 to 500 Hz, typically 20 Hz. Each stimulation dose may be performed for 30 seconds to 5 minutes, typically for about 60-120 seconds.
Typically, the treatment is performed repeatedly, e.g., multiple times per day for 1-24 months or longer. However, parameters of the stimulation may be varied in order to obtain a beneficial response, as described above in the various treatment paradigms. For example, levels and/or activities of ACh, interleukin-1 beta or IL-1ß or other pro-inflammatory cytokines, anti-inflammatory cytokines, in the patient's peripheral circulation and/or in the patient's cerebrospinal fluid can be measured, before, during and subsequent to each treatment. In addition, activities of the α7nAChR, receptor on cytokine-releasing immune cells or macrophages may also be measured. A beneficial response may also be determined through use of standard diagnostic tools for T2D, including measuring blood sugar levels, fasting glucose, HbA1c levels, insulin resistance, chronic inflammation and the like. The treatment is primarily intended to reduce inflammation and thereby improve at least some of the symptoms of T2D, including reducing blood glucose levels, reducing polydipsia, polyphagia, polyuria, weight loss, blurred vision, headaches, fatigue, slow healing and reducing the risk of long-term complications of T2D, such as ketoacidosis, high blood pressure, diabetic foot ulcers, chronic kidney disease, stroke, cardiovascular disease, peripheral artery disease, diabetic retinopathy and the like.
Embodiments of Reusable Neurostimulators
Referring now to
In particular, in
The housing 102 houses (e.g., internally, externally) the processor 104, the memory 106, the medical device 108, and the input device 110. The housing 102 can include plastic, metal, rubber, or others. The housing 102 can be rigid, elastic, resilient, or flexible. For example, the housing 102 can be included in or embodied as a phone, a tablet, a laptop, a phone/tablet/laptop case, a patch, an adhesive bandage, a strip, an anklet, a belt, a bracelet, a necklace, a garment, a pad, a ring, a mattress, a pillow, a blanket, a robot, a surgical instrument, a stimulator, an infusion device, or others. For example, the housing 102 can be embodied as described in US Patent Application Publication 20140330336 and U.S. Pat. Nos. 8,874,205, 9,174,066, 9,205,258, 9,375,571, and 9,427,581, all of which are herein incorporated by reference for all purposes as if copied and pasted herein, such as all structures, all functions, and all methods of manufacture and use, as disclosed therein. As such, the medical device 108 can be embodied as described in US Patent Application Publication 20140330336 and U.S. Pat. Nos. 8,874,205, 9,174,066, 9,205,258, 9,375,571, and 9,427,581, all of which are herein incorporated by reference for all purposes as if copied and pasted herein, such as all structures, all functions, and all methods of manufacture and use, as disclosed therein.
In some embodiments, the housing 102 includes a plurality of housings 102, where the processor 104, the memory 106, the medical device 108, and the input device 110 are distributed (e.g., internally, externally) among the housings 102 in any permutational or combinatory manner. For example, one of the housings 102 may include the processor 104, the memory 106, whereas another of the housings 102 may include the medical device 108, and the input device 110, where the one of the housings 102 and the another of the housings 102 are signally coupled to each other, such as via wiring, wireless, transceivers, waveguides, or others. For example, one of the housings 102 may include the processor 104, the memory 106, and the medical device 108, whereas another of the housings 102 may include the input device 110, where the one of the housings 102 and the another of the housings 102 are signally coupled to each other, such as via wiring, wireless, transceivers, waveguides, or others.
In some embodiments, the housing 102 is anti-tamper or includes an anti-tamper device or technique, such as via a mechanic or chemical technique. Note that anti-tamper or the anti-tamper device includes at least one of a tamper resistance, a tamper detection, a tamper response, or a tamper evidence. For example, the housing 102 can be mechanically anti-tamper via including a screw that can be operated with a non-standard bit. For example, the housing 102 can be chemically anti-tamper via including a tamper evident seal.
The processor 104 is coupled to the memory 106, the medical device 108, and the input device 110, such as via wiring, wireless, transceivers, waveguides, or other wireless or wired coupling methods. The processor 104 can include a single core or multicore processor. The processor 104 can be included in or be a controller, such as a programmable logic controller (PLC) or others. The processor 104 can be distinct from the medical device 108 or be a component of the medical device 108.
The memory 106, whether volatile or non-volatile, is at least one of a mechanical memory, such as a punch card or others, or a semiconductor memory, such as a flash memory or others. The memory 106 can be distinct from the medical device 108 or be a component of the medical device 108. The memory 106 can receive, such as via a physical recordation, a wired or wireless connection, or others, and store a logic, such as projections, depressions, holes, modules, objects, programs, apps, firmware, microcode, or other forms of instruction, for execution via the processor 104. For example, the logic can be programmed or input via a (1) a manufacturer of the system 100A, (2) a distributor of the system 100A, (3) a retailer of the system 100A, (4) a wholesaler of the system 100A, or (5) a user of the system 100A, such as a medical service provider, a patient, or others. For example, a pharmacist can receive the system 100A programmed for use with a specific medical condition, disease, or disorder or a specific dosage or a specific patient or the pharmacist can receive the system 100A without being programmed for use with a specific medical condition, disease, or disorder or a specific dosage or a specific patient and then the pharmacist can program for use with a specific medical condition, disease, or disorder or a specific dosage or a specific patient, as disclosed herein. For example, a pharmacist or assistant thereof can program, such as over a wired or wireless connection, the logic via a pharmacy electronic terminal, which can include an electronic payment device, such as a payment card reader, a mobile phone wallet reader, a currency input device, a bill acceptor, a cash register, or others, or via a point-of-sale (POS) system, which may include some, most, or all of the foregoing, and can be positioned in a customer interaction area or a back pharmacy or restricted personnel area, or others. Such programming can include input or modification of (1) patient identification information, such as personal information, biometrics (e.g., fingerprint, retina scan), or others, (2) medical condition, disease, or disorder type, (3) prevention, diagnosis, monitoring, amelioration, or treatment information, such as medical device operation parameters, such as dosages, timing, or others. For example, the logic can be executed via the processor 104, such as to authenticate users, to use or to track use of the medical device 108 for at least one of prevention, diagnosis, monitoring, amelioration, or treatment, to modify prescription data, to switch the medical device 108 between a plurality of modes, to communicate with other devices, accessories, peripherals, to reconfigure, retrofit, or update the medical device 108, or others.
The memory 106 also stores a first content, such as an activation code, a set of prescription data, a set of dosage/frequency of use data, or others, that is associated with the medical device 108, such as uniquely or others. For example, the first content can include a content (e.g., barcode, text, image, sound) that is unique with respect to other similar medical devices 108, such as a serial number, a device identifier, a device parameter, or others, or a plurality of medical devices listed in a database, as disclosed herein. The first content can be stored internal or external to the logic stored in the memory 106. The first content can be of any type, such as an alphanumeric, an image, a barcode, a sound, a data structure, a projection, a depression, a hole, or any others. The first content can be formatted in any manner, such as binary, denary, hexadecimal, or others.
The medical device 108 can include one or more sensors, such as, for example, biosensors, feedback sensors, chemical sensors, optical sensors, acoustic sensors, vibration sensors, motion sensors, fluid sensors, radiation sensors, temperature sensors, motion sensors, proximity sensors, fluid sensors, or others. The one sensor can be used to sense and detect various properties, conditions and/or characteristics or variations to same or lack thereof. The sensor may generate an output, such as one or more outputs, which are communicated, via wire, wirelessly or waveguide, to the medical device 108, a base station, processor, server, or other logic or computing device. The output may be used as an input to one or more of the foregoing devices to forecast or avert an imminent onset or predicted upcoming onset of a symptom, episode, condition or disease. For example, as disclosed in U.S. Patent App. Pub. No. 2017/0120052, which is incorporated herein by reference in its entirety for at least these purposes as if copied and pasted herein, as disclosed herein, and for all purposes as if copied and pasted herein, such as all structures, all functions, and all methods of manufacture and use, as disclosed therein.
The medical device 108 can be of any type to at least one of prevent, diagnose, monitor, ameliorate, or treat a medical condition, a disease, or a disorder of a patient, such as a mammal, such as a human, whether infant, child, adult, or elderly, or others.
For example, the medical device 108 can be configured to prevent, diagnose, monitor, ameliorate, or treat any or the conditions, diseases or disorders listed previously. For example, the medical device 108 can be configured to prevent, diagnose, monitor, ameliorate, or treat a neurological condition, such as epilepsy, headache/migraine, whether primary or secondary, whether cluster or tension, neuralgia, seizures, vertigo, dizziness, concussion, aneurysm, palsy, Parkinson's disease, Alzheimer's disease, or others, as understood to skilled artisans and which are only omitted here for brevity.
For example, the medical device 108 can be configured to prevent, diagnose, monitor, ameliorate, or treat neurological, neuropsychological, or neuropsychiatric activity, such as a modulation of neuronal function or processing to affect a functional outcome. The modulation of neuronal function can be useful with regard to diagnose, monitor, prevent, treat, or ameliorate of neurological, psychiatric, psychological, conscious state, behavioral, mood, or thought activity. For example, this activity can manifests itself in a form of a disorder, such as attention or cognitive disorders (e.g., Autistic Spectrum Disorders), mood disorder (e.g., major depressive disorder, bipolar disorder, dysthymic disorder), anxiety disorder (e.g., panic disorder, posttraumatic stress disorder, obsessive-compulsive disorder, phobic disorder); neurodegenerative diseases (e.g., multiple sclerosis, Alzheimer's disease, amyotrophic lateral sclerosis (ALS), Parkinson's disease, Huntington's Disease, Guillain-Barre syndrome, myasthenia gravis, and chronic idiopathic demyelinating disease (CID)), movement disorders (e.g., dyskinesia, tremor, dystonia, chorea and ballism, tic syndromes, Tourette's Syndrome, myoclonus, drug-induced movement disorders, Wilson's Disease, Paroxysmal Dyskinesias, Stiff Man Syndrome and Akinetic-Ridgid Syndromes and Parkinsonism), epilepsy, tinnitus, pain, phantom pain, diabetes neuropathy, enhancing or diminishing any neurological or psychiatric function not just an abnormality or disorder or others, as understood to skilled artisans and which are only omitted here for brevity. Neurological activity that may be modulated can include normal functions, such as alertness, conscious state, drive, fear, anger, anxiety, repetitive behavior, impulses, urges, obsessions, euphoria, sadness, and the fight or flight response, as well as instability, vertigo, dizziness, fatigue, photophobia, concentration dysfunction, memory disorders, headache, dizziness, irritability, fatigue, visual disturbances, sensitivity to noise (misophonia, hyperacusis, phonophobia), judgment problems, depression, symptoms of traumatic brain injury (whether physical, emotional, social, or chemical), autonomic functions, which includes sympathetic or parasympathetic functions (e.g., control of heart rate), somatic functions, or enteric functions.
For example, the medical device 108 can be configured to prevent, diagnose, monitor, ameliorate, or treat a neurodegenerative disease, such as Alzheimer's disease, Parkinson's disease, multiple sclerosis, postoperative cognitive dysfunction, and postoperative delirium, or others, as understood to skilled artisans and which are only omitted here for brevity.
For example, the medical device 108 can be configured to prevent, diagnose, monitor, ameliorate, or treat an inflammatory disorder, such as Alzheimer's disease, ankylosing spondylitis, arthritis (osteoarthritis, rheumatoid arthritis (RA), psoriatic arthritis), asthma, atherosclerosis, Crohn's disease, colitis, dermatitis, diverticulitis, fibromyalgia, hepatitis, irritable bowel syndrome (IBS), systemic lupus erythematous (SLE), nephritis, Parkinson's disease, ulcerative colitis, chronic peptic ulcer, tuberculosis, periodontitis, sinusitis, hepatitis, or others, as understood to skilled artisans and which are only omitted here for brevity.
For example, the medical device 108 can be configured to prevent, diagnose, monitor, ameliorate, or treat a gastrointestinal condition, such as ileus, irritable bowel syndrome, Crohn's disease, ulcerative colitis, diverticulitis, gastroesophageal reflux disease, or others, as understood to skilled artisans and which are only omitted here for brevity.
For example, the medical device 108 can be configured to prevent, diagnose, monitor, ameliorate, or treat a bronchial disorder, such as asthma, bronchitis, pneumonia, or others, as understood to skilled artisans and which are only omitted here for brevity.
For example, the medical device 108 can be configured to prevent, diagnose, monitor, ameliorate, or treat a coronary artery disease, heart attack, arrhythmia, cardiomyopathy, or others, as understood to skilled artisans and which are only omitted here for brevity.
For example, the medical device 108 can be configured to prevent, diagnose, monitor, ameliorate, or treat a urinary disorder, such as urinary incontinence, urinalysis, overactive bladder, or others, as understood to skilled artisans and which are only omitted here for brevity.
For example, the medical device 108 can be configured to prevent, diagnose, monitor, ameliorate, or treat a cancer, such as bladder cancer, breast cancer, prostate cancer, lung cancer, colon or rectal cancer, skin cancer, thyroid cancer, brain cancer, leukemia, liver cancer, lymphoma, pancreatic cancer, or others, as understood to skilled artisans and which are only omitted here for brevity.
For example, the medical device 108 can be configured to prevent, diagnose, monitor, ameliorate, or treat a metabolic disorder, such as diabetes (type 1, type 2, or gestational), Gaucher's disease, sick cell anemia, cystic fibrosis, hemochromatosis, or others, as understood to skilled artisans and which are only omitted here for brevity.
The medical device 108 can be configured to output an energy via an energy source of the medical device 108, such as a mechanical energy via an actuation source (e.g., actuator) of the medical device 108, an electrical energy via a current or voltage source (e.g., electrode) of the medical device 108, an electromagnetic energy via an impulse source (e.g., generator) of the medical device 108, a thermal energy via a heating (e.g., heating element) or cooling (e.g., ice pack, fan) source of the medical device 108, an acoustic energy via an acoustic source (e.g., speaker, transducer) of the medical device 108, or a light energy via a light source (e.g., bulb, laser beam generator) of the medical device 108. For example, as shown in
The medical device 108 can be configured to prevent, diagnose, monitor, ameliorate, or treat a medical condition, a disease, or a disorder of a patient based on a contact with or output of an energy (e.g. mechanical, electrical, thermal, acoustic, photonic) or a fluid (e.g., liquid, gas, gel, suspension, solution) or powder to various organ systems of human body or any components thereof. These organ systems can include a muscular system, such as human skeleton, joints, ligaments, or tendons. These organ systems can include a digestive system, such as mouth, salivary glands, pharynx, esophagus, stomach, small intestine, large intestine, liver, gallbladder, mesentery, pancreas, anal canal and anus, or appendix. These organ systems can include a respiratory system, such as nasal cavity, pharynx, larynx, trachea, bronchi, lungs, or diaphragm. These organ systems can include a urinary system, such as kidneys, ureters, bladder, or urethra. These organ systems can include a reproductive system, such as female reproductive system, ovaries, fallopian tubes, uterus, vagina, vulva, clitoris, placenta, male reproductive system, testes, epididymis, vas deferens, seminal vesicles, prostate, bulbourethral glands, penis, or scrotum. These organ systems can include an endocrine system, such as pituitary gland, pineal gland, thyroid gland, parathyroid glands, adrenal glands, or pancreas. These organ systems can include a circulatory system, such as heart, patent foramen ovale, arteries, veins, or capillaries. These organ systems can include a lymphatic system, such as lymphatic vessel, lymph node, bone marrow, thymus, spleen, or gut-associated lymphoid tissue. These organ systems can include a nervous system, such as brain, brainstem, cerebellum, spinal cord, ventricular system, peripheral nervous system, nerves, sensory organs, eye, ear, olfactory epithelium, or tongue. These organ systems can include integumentary system, such as mammary glands, skin, or subcutaneous tissue.
The medical device 108 can be configured to prevent, diagnose, monitor, ameliorate, or treat a medical condition, a disease, or a disorder of a patient based on a contact with or output of an energy (e.g., mechanical, electrical, thermal, acoustic, photonic) or a fluid (e.g., liquid, gas, gel, suspension, solution) or powder to various muscles of human body or any components thereof. These muscle systems include These muscle systems include forehead/eyelid, such as occipitofrontalis, occipitalis, frontalis, orbicularis oculi, corrugator supercilii, or depressor supercilii. These muscle systems include extraocular muscles, such as levator palpebrae superioris, superior tarsal, rectus muscles, or oblique muscles. These muscle systems include ear, such as auriculares, temporoparietalis, stapedius, or tensor tympani. These muscle systems include nose, such as procerus, nasalis, dilator naris, depressor septi nasi, or levator labii superioris alaeque nasi. These muscle systems include mouth, such as levator anguli oris, depressor anguli oris, levator labii superioris, depressor labii, inferioris, mentalis, buccinator, orbicularis oris, risorius, or zygomatic muscles. These muscle systems include mastication, such as masseter, temporalis, or pterygoid muscles. These muscle systems include tongue, such as genioglossus, hyoglossus, chondroglossus, styloglossus, or palatoglossus. These muscle systems include intrinsic, such as superior longitudinal, transversus, inferior longitudinal, or verticalis muscle. These muscle systems include soft palate, such as levator veli palatini, tensor veli palatini, musculus uvulae, palatoglossus, or palatopharyngeus. These muscle systems include pharynx, such as stylopharyngeus, salpingopharyngeus, or pharyngeal muscles. These muscle systems include larynx, such as cricothyroid, arytenoid, thyroarytenoid, or cricoarytenoid muscles. These muscle systems include clavicular, such as platysma, or sternocleidomastoid. These muscle systems include suprahyoid, such as digastric, stylohyoid, mylohyoid, or geniohyoid. These muscle systems include anterior, such as longus colli, longus capitis, rectus capitis anterior, or rectus capitis lateralis. These muscle systems include lateral, such as scalene muscles, levator scapulae, rectus capitis lateralis, obliquus capitis superior, or obliquus capitis inferior. These muscle systems include posterior, such as rectus capitis posterior minor, rectus capitis posterior major, semispinalis capitis, longissimus capitis, splenius capitis, obliquus capitis superior, or obliquus capitis inferior. These muscle systems include back, such as erector spinae, latissimus dorsi, transversospinales, interspinales, intertransversarii, or splenius muscles. These muscle systems include chest, such as intercostals, subcostales, transversus thoracis, levatores costarum, serratus posterior muscles, diaphragm. These muscle systems include abdomen, such as transversus abdominis, rectus abdominis, pyramidalis, cremaster, quadratus lumborum, or oblique muscles. These muscle systems include pelvis, such as coccygeus, or levator ani. These muscle systems include perineum, such as sphincter ani, superficial perineal pouch, or deep perineal pouch. These muscle systems include vertebral column, such as trapezius, latissimus dorsi, rhomboids, or levator scapulae. These muscle systems include thoracic walls, such as pectoralis major, pectoralis minor, subclavius, or serratus anterior. These muscle systems include shoulder, such as deltoid, teres major, rotator cuff, supraspinatus, infraspinatus, teres minor, or subscapularis. These muscle systems include arm anterior compartment, such as coracobrachialis, biceps brachii, or brachialis. These muscle systems include arm posterior compartment, such as triceps brachii, or anconeus. These muscle systems include forearm anterior compartment, such as pronator teres, flexor carpi radialis, palmaris longus, flexor carpi ulnaris, flexor digitorum superficialis, pronator quadratus, flexor digitorum profundus, or flexor pollicis longus. These muscle systems include forearm posterior compartment, such as extensor digitorum, extensor digiti minimi, extensor carpi ulnaris, mobile wad, supinator, extensor indicis, anatomical snuff box, or extensor pollicis brevis. These muscle systems include hand such as opponens pollicis, flexor pollicis brevis, abductor pollicis brevis, adductor pollicis, palmaris brevis, hypothenar, lumbrical, dorsal interossei, or palmar interossei. These muscle systems include lower limb, such as iliopsoas, tensor fasciae latae, gluteal muscles, lateral rotator group, superior gemellus, articularis genus, sartorius, quadriceps femoris, biceps femoris, semitendinosus, semimembranosus, or adductor muscles of the hip. These muscle systems include leg, such as tibialis anterior, extensor hallucis longus, extensor digitorum longus, fibularis tertius, triceps surae, popliteus, tarsal tunnel, longus, or brevis. These muscle systems include foot, such as extensor digitorum brevis, extensor hallucis brevis, abductor hallucis, flexor digitorum brevis, abductor digiti minimi, quadratus plantae, lumbrical muscle, flexor hallucis brevis, adductor hallucis, flexor digiti minimi brevis, dorsal interossei, or plantar interossei.
The medical device 108 can be configured to prevent, diagnose, monitor, ameliorate, or treat a medical condition, a disease, or a disorder of a patient based on a contact with or output of an energy (e.g., mechanical, electrical, thermal, acoustic, photonic) or a fluid (e.g., liquid, gas, gel, suspension, solution) or powder to various nerves of human body or any components thereof. These nerves include nerves, such as abdominal aortic plexus, abducens nerve, accessory nerve, accessory obturator nerve, alderman's nerve, anococcygeal nerve, ansa cervicalis, anterior interosseous nerve, anterior superior alveolar nerve, auerbach's plexus, auriculotemporal nerve, axillary nerve, brachial plexus, buccal branch of the facial nerve, buccal nerve, cardiac plexus, cavernous nerves, cavernous plexus, celiac ganglia, cervical branch of the facial nerve, cervical plexus, chorda tympani, ciliary ganglion, coccygeal nerve, cochlear nerve, common fibular nerve, common palmar digital nerves of median nerve, deep branch of the radial nerve, deep fibular nerve, deep petrosal nerve, deep temporal nerves, diagonal band of broca, digastric branch of facial nerve, dorsal branch of ulnar nerve, dorsal nerve of clitoris, dorsal nerve of the penis, dorsal scapular nerve, esophageal plexus, ethmoidal nerves, external laryngeal nerve, external nasal nerve, facial nerve, femoral nerve, frontal nerve, gastric plexuses, geniculate ganglion, genital branch of genitofemoral nerve, genitofemoral nerve, glossopharyngeal nerve, greater auricular nerve, greater occipital nerve, greater petrosal nerve, hepatic plexus, hypoglossal nerve, iliohypogastric nerve, ilioinguinal nerve, inferior alveolar nerve, inferior anal nerves, inferior cardiac nerve, inferior cervical ganglion, inferior gluteal nerve, inferior hypogastric plexus, inferior mesenteric plexus, inferior palpebral nerve, infraorbital nerve, infraorbital plexus, infratrochlear nerve, intercostal nerves, intercostobrachial nerve, intermediate cutaneous nerve, internal carotid plexus, internal laryngeal nerve, interneuron, jugular ganglion, lacrimal nerve, lateral cord, lateral cutaneous nerve of forearm, lateral cutaneous nerve of thigh, lateral pectoral nerve, lateral plantar nerve, lateral pterygoid nerve, lesser occipital nerve, lingual nerve, long ciliary nerves, long root of the ciliary ganglion, long thoracic nerve, lower subscapular nerve, lumbar nerves, lumbar plexus, lumbar splanchnic nerves, lumboinguinal nerve, lumbosacral plexus, lumbosacral trunk, mandibular nerve, marginal mandibular branch of facial nerve, masseteric nerve, maxillary nerve, medial cord, medial cutaneous nerve of arm, medial cutaneous nerve of forearm, medial cutaneous nerve, medial pectoral nerve, medial plantar nerve, medial pterygoid nerve, median nerve, meissner's plexus, mental nerve, middle cardiac nerve, middle cervical ganglion, middle meningeal nerve, motor nerve, muscular branches of the radial nerve, musculocutaneous nerve, mylohyoid nerve, nasociliary nerve, nasopalatine nerve, nerve of pterygoid canal, nerve to obturator internus, nerve to quadratus femoris, nerve to the piriformis, nerve to the stapedius, nerve to the subclavius, nervus intermedius, nervus spinosus, nodose ganglion, obturator nerve, oculomotor nerve, olfactory nerve, ophthalmic nerve, optic nerve, otic ganglion, ovarian plexus, palatine nerves, palmar branch of the median nerve, palmar branch of ulnar nerve, pancreatic plexus, patellar plexus, pelvic splanchnic nerves, perforating cutaneous nerve, perineal branches of posterior femoral cutaneous nerve, perineal nerve, petrous ganglion, pharyngeal branch of vagus nerve, pharyngeal branches of glossopharyngeal nerve, pharyngeal nerve, pharyngeal plexus, phrenic nerve, phrenic plexus, posterior auricular nerve, posterior branch of spinal nerve, posterior cord, posterior cutaneous nerve of arm, posterior cutaneous nerve of forearm, posterior cutaneous nerve of thigh, posterior scrotal nerves, posterior superior alveolar nerve, proper palmar digital nerves of median nerve, prostatic plexus (nervous), pterygopalatine ganglion, pudendal nerve, pudendal plexus, pulmonary branches of vagus nerve, radial nerve, recurrent laryngeal nerve, renal plexus, sacral plexus, sacral splanchnic nerves, saphenous nerve, sciatic nerve, semilunar ganglion, sensory nerve, short ciliary nerves, sphenopalatine nerves, splenic plexus, stylohyoid branch of facial nerve, subcostal nerve, submandibular ganglion, suboccipital nerve, superficial branch of the radial nerve, superficial fibular nerve, superior cardiac nerve, superior cervical ganglion, superior ganglion of glossopharyngeal nerve, superior ganglion of vagus nerve, superior gluteal nerve, superior hypogastric plexus, superior labial nerve, superior laryngeal nerve, superior lateral cutaneous nerve of arm, superior mesenteric plexus, superior rectal plexus, supraclavicular nerves, supraorbital nerve, suprarenal plexus, suprascapular nerve, supratrochlear nerve, sural nerve, sympathetic trunk, temporal branches of the facial nerve, third occipital nerve, thoracic aortic plexus, thoracic splanchnic nerves, thoraco-abdominal nerves, thoracodorsal nerve, tibial nerve, transverse cervical nerve, trigeminal nerve, trochlear nerve, tympanic nerve, ulnar nerve, upper subscapular nerve, uterovaginal plexus, vagus nerve, ventral ramus, vesical nervous plexus, vestibular nerve, vestibulocochlear nerve, zygomatic branches of facial nerve, zygomatic nerve, zygomaticofacial nerve, or zygomaticotemporal nerve.
The medical device 108 can be configured to prevent, diagnose, monitor, ameliorate, or treat a medical condition, a disease, or a disorder of a patient based on a contact with or output of an energy (e.g., mechanical, electrical, thermal, acoustic, photonic) or a fluid (e.g., liquid, gas, gel, suspension, solution) or powder to various bones of human body or any components thereof. These bones include spine, such as cervical vertebrae, thoracic vertebrae, lumbar vertebrae, sacral vertebrae, or coccygeal vertebrae. These bones include chest, such as hyoid, sternum, or ribs. These bones include head, such as cranial bones, facial bones, hyoid bones, or middle ear. These bones include arm, such as humerus, pectoral girdle, hand, metacarpals, or phalanges of the hand. These bones include pelvis, such as hip bone, ilium, ischium, pubis, sacrum, or coccyx. These bones include leg, such as femur, patella, tibia, fibula, or foot
The medical device 108 has at least a first mode and a second mode. As such, since the processor 104 is coupled (e.g., electrically, mechanically) to the medical device 108, the processor 104 is able to execute (e.g., serial, parallel) the logic stored on the memory 106 and thereby switch the medical device 108 between the first mode and the second mode based on an input, such as a trigger, a heuristic, an action, or others, and operate the medical device 108 in the first mode or the second mode based on a set of parameters, which may be accessible to or stored in or via the logic via the memory 106. For example, the first mode can be an off mode and the second mode can be an on mode or vice versa. Similarly, the first mode can be a deactivated mode and the second mode can be an activated mode or vice versa. However, note that (1) the medical device 108 can be in the on mode, yet still be in the deactivated mode, and (2) the medical device 108 can at least one of prevent, diagnose, monitor, ameliorate, or treat the medical condition, disease, or the disorder of the patient in the activated mode. However, note again that, within the activated mode, the medical device 108 may have a plurality of sub-modes as well, such as modes of prevention, diagnosis, monitoring, amelioration, or treatment of various types, intensities, dosages, or others, which can vary based on medical conditions, disorders, diseases, or conditions. For example, the medical device 108 can operate in a first manner during the first mode and in a second manner in the second mode, where the first manner is different from or identical to the second manner, such as in an amount of operation, in an intensity of operation, in a duration of operation, in a modality of operation, in an energy use of operation, or others. For example, when the processor 104 switches the medical device 108 from the first mode (e.g., a deactivated mode) to the second mode (e.g., an activate mode), then such switching can activate the medical device 108 for a specific time period or a number of diagnosis or treatment doses or other parameters or vice versa. For example, the amount of operation includes a number of individual doses of at least one of diagnosis or treatment doses, such as less than or more than 3 doses, 4 doses, 5 doses, 6 doses, 7 doses, 8 doses, 9 doses, 10 doses, 15 doses, 20 doses, 25 doses, 30 doses, 40 doses, 45 doses, 50 doses, 60 doses, 65 doses, 70 doses, 75 doses, 80 doses, 85 doses, 90 doses, 95 doses, 100 doses, 200 doses, 300 doses, 400 doses, 500 doses, 600 doses, 700 doses, 800 doses, 900 doses, 1000 doses, or any other amount of doses from 1 to 1000 or greater, or others, whether a dose is based on a single use or a set of uses within a predefined time period (e.g., milliseconds, seconds, minutes, hours, days, weeks, months, years). As such, the medical device 108 can be adjusted where the first mode and the second mode can be equal or unequal in amount of doses. Similarly, the intensity of operation includes a degree or type of intensity with which the medical device 108 at least one of prevents, diagnoses, monitors, ameliorates, or treats the medical condition, disease, or the disorder in the patient. For example, the first mode can be associated with a first prevention, diagnosis, monitoring, amelioration, or treatment signal/energy output and the second mode can be associated with a second prevention, diagnosis, monitoring, amelioration, or treatment signal/energy output, wherein the first signal/energy output is identical to or differs from the second signal/energy output in various parameters, such as a content, a format, an amplitude, a frequency, a time period, or others. As such, the medical device 108 can be adjusted to more intensely or less intensely prevent, diagnose, monitor, ameliorate, or treat based on switching between the first mode and the second mode. Likewise, the duration of operation includes a number of defined time periods during which the medical device can at least one of prevent, diagnose, monitor, ameliorate, or treat, such as a number of seconds, minutes, hours, days, weeks, months, or others, whether dependent on usage or independent of usage. As such, the medical device 108 can be adjusted to a least one of prevent, diagnose, monitor, ameliorate, or treat between a first defined time period and a second defined time period.
The input device 110 is configured to obtain, such as via reading, copying, or others, a second content from a storage medium, such as a magnetic card, a radio frequency identification (RFID) card, a chip card, a barcode, a Quick Response (QR) code, or others, such that the processor 104 switches the medical device 108 between the first mode and the second mode based on the first content corresponding to the second content, such as logically or others, or vice versa. The second content, such as an activation code, a set of prescription data, a set of dosage/frequency of use data, or others, can be associated with the medical device 108, such as uniquely or others, with a specific mode of operation, such as for preventing, diagnosing, monitoring, ameliorating, or treating a specific medical condition, disease, or disorder, or with a particular user, such as based on a user identifier, such as a personal identification number (PIN), a biometric, or others. Note that the particular user can be associated with the medical device 108, such as via a primary key of a relational database, as disclosed herein. For example, the primary key can be the PIN or another set of data such that the second content is unique to the particular user. In some embodiments, where the medical device 108 is shared among a plurality of users, the second content can be unique to one of the users, yet access control or authentication between the users can be controlled via another layer or form of identification, such as passwords, biometrics, or others, such as when the system 100A includes a user input device coupled to the processor 104. For example, the user input device can include a keyboard or dial, whether physical, virtual (e.g., display), or haptic (e.g., display), a biometric reader, a fob or tag, a barcode, or others.
The second content can be of any of type, whether identical to or different from the first content, such as an alphanumeric, an image, a barcode, a sound, a data structure, a projection, a depression, a hole, or any others. The second content can be formatted in any manner, whether identical to or different from the first content, such as binary, denary, hexadecimal, or others.
The input device 110 can be of any modality or type, such as a camera, a microphone, a sensor, a card reader, a signal receiver, or others. For example, as shown in
Similarly, as shown in
The input device 110 can obtain the second content from the storage medium in various ways. For example, the input device 110 can obtain the second content electronically, optically, electromagnetically, mechanically, or others, whether the storage medium is in or out of a line-of-sight of the input device 110. For example, when the input device 110 is the reader 110B, as per
The first content can correspond to the second content in various ways, such as logically, such as via a Boolean logic, or others. For example, the first content can match the second content in content, format, logic, parameters, encryption, or others. For example, the first content can be equal to the second content, whether in format or value. Similarly, the first content can be unequal to the second content, whether in format or value. Likewise, the first content can logically map to the second content, such as via a logical symmetry where the first content is same as the second content or where the first content is different from the second, but related in a relatively quick computational way. For example, such correspondence can be determined based on or via hashing the first content or the second content. In some embodiments, processor 104 or the input device 110 can convert the first content or the second content before determining whether the first content corresponds to the second content. For example, such conversion can involve a format or a content of the first content or the second content.
When the first content does not correspond to the second content, such as the first content does not match the second content in value and format or others, as described above, then the medical device 108 is not switched from the first mode, such as a deactivated mode, to the second mode, such as an activated mode. In some embodiments, when the first content does not correspond to the second content, then the medical device 108 is switched from the first mode to the second mode, but the second mode is as or less operational than the first mode. For example, the second mode is a default mode of operation, a minimal mode of operation, a demo mode of operation, a disabled mode of operation, a kiosk mode of operation, or others.
In some embodiments, the system 100 includes an output device, such as a signal transmitter, a light, sound, or vibration source, an actuator, a data writer, or others, coupled to the processor 104, whether over a wired, wireless, or waveguide connection, where the processor 104 is configured to instruct the output device to interface with the storage medium in response to the input device 110 reading the second content. For example, the output device can include a transmitter and the processor 104 can instruct the transmitter to send a signal to the storage medium such that the storage medium can receive and process the signal, which may involve acting based on such processing. For example, such action can allow deactivating the storage medium based on or after the medical device 108 is switched from the first mode, such as a deactivated mode, to the second mode, such as an activated mode. For example, the processor 104 can request the output device to interface with the storage medium such that the storage medium is locked from further reading, when the storage medium is enabled for such locking. Similarly, the processor 104 can request the output device to interface with the storage medium such that the second content on the storage medium is rendered unusable, when the storage medium is enabled for such data modification rights. Likewise, the processor 104 can request the output device to interface with the storage medium such that the second content on the storage medium is erased from the storage medium, whether temporarily or permanently, when the storage medium is enabled for such data modification rights. Also, the processor 104 can request the output device to interface with the storage medium such that the storage medium is reformatted, when the storage medium is enabled for such data modification rights. Additionally, the processor 104 can request the output device to interface with the storage medium such that the storage medium is modified from a first state to a second state, when the storage medium is enabled for such state modification rights, and where the first state is before the input device 110 obtains the second content from the storage medium, and where the second state is after the input device 110 obtains the second content from the storage medium. Note that such interfacing can include electronically or physically modifying the storage medium or a content or data format thereon. Note that the first state and the second state can differ from each other in various ways (e.g., more or less functionality, more or less energy use, more or less data reading or modification or deletion or reformatting rights). As such, the output device can be useful to lock or wipe the storage medium once the input device 110 reads the second content from the storage medium.
When the system 100A is used to at least one of prevent, diagnose, monitor, ameliorate, or treat the medical condition, disease, or the disorder of the patient, the processor 104 tracks such use and can take an action when a predetermined threshold is satisfied or not satisfied, such as via the logic stored via the memory 106. For example, the logic tracks a use of the medical device 108 and when a number of uses, as programmed in advance, satisfies or does not satisfy the predetermined threshold, then the processor 104 can take an action, such as switch the medical device 108 between the first mode, such as an activated mode, and the second mode, such as a deactivated mode, or vice versa. Note that the logic has access to or can modify the predetermined threshold. Further, note that the predetermined threshold can be based on a number of single uses within a predefined time period (e.g., within a day, a week, a month, a year) or a number of single uses regardless of any time limit. For example, the action can include activating the medical device 108, deactivating the medical device 108, creating, modifying, or deleting a prevention, diagnosis, monitoring, amelioration, or treatment parameter of the medical device 108, as stored via the medical device 108 or the memory 106, creating, modifying, or deleting a set of treatment instructions of the medical device 108, as stored via the medical device 108 or the memory 106, or others.
In one mode of operation, a user of the system 100A positions the storage medium in proximity thereof, such as within about ten feet or less. The input device 110 interfaces with the storage medium such that the processor 104 switches the medical device 108 between the first mode and the second mode. If the first mode was a deactivated mode and the second mode was an activated mode, then the user can use the system 100A to prevent, diagnose, monitor, ameliorate, or treat the medical condition, disease, or the disorder of the user or another. For example, the input device 110 can read the second content from the storage medium and pass the second content to the processor 104. In response, the processor 104 can confirm that the first content, which is uniquely associated with the medical device 108, matches the second card, such as via value and format. Upon such confirmation, the processor 104 switches the medical device 108 from the first mode to the second mode.
The network 202 includes a plurality of nodes that allow for sharing of resources or information. The network 202 can be wired or wireless. For example, the network 202 can be a local area network (LAN), a wide area network (WAN), a cellular network, a satellite network, or others.
Each of the pharmacy client 204 and the doctor client 212 is a workstation that runs an operating system, such as MacOS®, Windows®, or others, and an application, such as an administrator application, on the operating system. The workstation can include and/or be coupled to, whether directly and/or indirectly, an input device, such as a mouse, a keyboard, a camera, whether forward-facing and/or back-facing, an accelerometer, a touchscreen, a biometric reader, a clicker, a microphone, a barcode or QR code reader, or any other suitable input device. The workstation can include and/or be coupled to, whether directly and/or indirectly, an output device, such as a display, a speaker, a headphone, a printer, or any other suitable output device. In some embodiments, the input device and the output device can be embodied in one unit, such as a touch-enabled display, which can be haptic. As such, the application presents a graphical user interface (GUI) configured to interact with a user to perform various functionality, as disclosed herein. In some embodiments, the application on the pharmacy client 204 can operate in an administrator mode and a kiosk mode, such as an agent mode or others, where the administrator mode has more or higher access privileges than the kiosk mode, where the kiosk mode is used for programming the medical device 208 or coupling the medical device 208 to the storage medium, as disclosed herein. Note that the application on the pharmacy client 204 can control access between the administrator mode and the kiosk mode via user identifiers, passwords, biometrics, or others. Further, note that at least one of the pharmacy client 204 or the doctor client 212 can be a non-workstation computer as well, such as a smartphone, a tablet, a laptop, a wearable, an eyewear unit, or others.
The server 210 runs an operating system, such as MacOS®, Windows®, or others, and an application, such as a prescription management application, on the operating system. In some embodiments, the server 210 hosts or has access to a database, such as a relational database, an in-memory database, a graphical database, a NoSQL database, or others. For example, the database can include a plurality of records, where each of the records contains a plurality of fields associated with a plurality of categories, such as patient identifier, patient contact information, patient medical record, prescription name, prescription dosage, and others. Note that the database can include or be coupled to an electronic medical records (EMR) database, whether local or remote thereto, whether using a same or different schema (e.g., star, tree). The server 210 can include and/or be coupled to, whether directly and/or indirectly, an input device, such as a mouse, a keyboard, a camera, whether forward-facing and/or back-facing, an accelerometer, a touchscreen, a biometric reader, a clicker, a microphone, or any other suitable input device. The server 210 can include and/or be coupled to, whether directly and/or indirectly, an output device, such as a display, a speaker, a headphone, a printer, or any other suitable output device. In some embodiments, the input device and the output device can be embodied in one unit, such as a touch-enabled display, which can be haptic.
The input device 206 is coupled to the pharmacy client 204, whether over in a wired, wireless, or waveguide connection, and can include a camera, a microphone, a keyboard, whether physical or virtual, a reader, or others. The input device 204 can be battery powered or powered via the pharmacy client 204.
The medical device 208, such as the system 100A, the medical device 108, or others, comprises a device identifier, such as the first content, as disclosed herein, whether internally, such as via the memory 106 or others, or externally, such as on the medical device 108 itself, on a tag coupled to the medical device 108, such as via adhering, fastening, mating, or others, or on a tag coupled to or depicted or printed on a package containing the medical device 208.
In one mode of operation, as shown in
As per block 302, a user of the pharmacy client 204 uses the input device 206 to obtain the device identifier from the medical device 208. For example, when the device identifier, such as the first content, is internal to the medical device 208, then the input device 206 can interface with the medical device 208, whether over a wired, wireless, or waveguide connection, and obtain the device identifier, such as via an RFID interrogation or others. Likewise, when the device identifier is external to the medical device 208, then the input device 206 obtains the device identifier via reading the device identifier, such as via barcode or QR code scanning or others. Note that the block 302 can occur before, during, or after the block 304. As such, once the pharmacy client 204 has the device identifier and the set of prescription data, as per block 306, the pharmacy client 204 associates the device identifier and the set of prescription data, whether locally or on the server 210, such as via relating the device identifier and the set of prescription data in the database, such as via a primary key or others. Therefore, as per block 308, an action can be taken with the medical device 208. For example, the action can be via the pharmacy client 210 prompting a message that the medical device 208 is associated with the set of prescription data, generating a sound alert, modifying a data structure, or others. Similarly, the action can include packaging or repackaging the medical device 208, shipping the medical device 208, handing over the medical device 208 to a patient, or others.
As per block 402, a user of the pharmacy client 204 uses the input device 206 to obtain the device identifier from the medical device 208. For example, when the device identifier, such as the first content, is internal to the medical device 208, then the input device 206 can interface with the medical device 208, whether over a wired, wireless, or waveguide connection, and obtain the device identifier, such as via an RFID interrogation or others. Likewise, when the device identifier is external to the medical device 208, then the input device 206 obtains the device identifier via reading the device identifier, such as via barcode or QR code scanning or others. Note that the block 402 can occur before, during, or after the block 404.
As such, once the pharmacy client 204 has the device identifier and the set of prescription data, as per block 406, the pharmacy client 204 can be used to program or reprogram a storage medium, such as an RFID card or others, based on the set of prescription data, via an output device, such as a signal transmitter, a light, sound, or vibration source, an actuator, a data writer, or others, coupled to the pharmacy client 204, whether over a wired, wireless, or waveguide connection. For example, such programming can be via an RFID interrogation or other technologies. For example, such programming can involve using the pharmacy client 204 to program the storage medium to match the device identifier that is uniquely associated with the medical device 208. For example, the pharmacy client 204 can instruct the output device to interface with the storage medium, such as via adding, modifying, or deleting content or format to or from the storage medium such that the storage medium stores the set of prescription data or a logic containing a set of instructions to operate the medical device 208 according to the set of prescription data. Note that this logic can be included in the set of prescription data or generated via the server 210 or the pharmacy client 204 based on the set of prescription data. In some embodiments, the medical device 208 generates this logic based on the set of prescription data as obtained from the storage medium. Therefore, the storage medium can be positioned in proximity (e.g., within about 10 feet or less) of the system 100A to be read via the input device 110 such that the processor 104 can switch the medical device 108 between the first mode and the second mode. Note that for recordkeeping purposes, the pharmacy client 204 can communicate (e.g., email, texting, social networking, over-the-top) a message informative of such programming to the server 210 over the network 202, such as for writing into the record of the patient in the database. For example, the pharmacy client 204 associates the device identifier and the set of prescription data, whether locally or on the server 210, such as via relating the device identifier and the set of prescription data in the database, such as via a primary key or others.
Consequently, as per block 408, the storage medium, as programmed, can be provided to the patient, such as via handing over to the patient, packaging/shipping to the patient, or communicating to the patient, such as via email, text, social networking, over-the-top messaging, or others. As such, a POS terminal, such as the pharmacy client 204, can be used to (1) obtain a device identifier from the medical device 208, (2) retrieve a set of prescription data from the server 210, where the device identifier is uniquely associated with the medical device 208, and (3) program, such as via encoding or others, a storage medium, such as an RFID card or others, based on the device identifier and the set of prescription data such that the medical device 208 can be switched from a first mode, such as a deactivated mode, to a second mode, such as an activated mode, or load a set of new therapy dose data, based on the storage medium being in proximity of the medical device 208.
In some embodiments, the output device can include a transmitter (e.g., wired, wireless, waveguide) and the pharmacy client 204 can instruct the transmitter to send (e.g., wired, wireless, waveguide) a signal to the storage medium such that the storage medium can receive and process the signal, which may involve acting based on such processing. For example, the pharmacy client 204 can request the output device to interface with the storage medium such that the storage medium is locked from further reading or writing or modifying or deleting, whether in data or format, when the storage medium is enabled for such locking. Similarly, the pharmacy client 204 can request the output device to interface with the storage medium such that the second content on the storage medium is rendered unusable, when the storage medium is enabled for such data modification rights. Likewise, the pharmacy client 204 can request the output device to interface with the storage medium such that the second content on the storage medium is erased from the storage medium, whether temporarily or permanently, when the storage medium is enabled for such data modification rights. Also, the pharmacy client 204 can request the output device to interface with the storage medium such that the storage medium is reformatted, when the storage medium is enabled for such data modification rights. Note that such interfacing can include electronically or physically modifying the storage medium or a content or data format thereon or an encryption thereon.
As such, in order to initially provision or refill the neurostimulator 606 for a neurostimulation (or another medical modality) session, as shown in
The tablet 902 hosts a plurality of apps and is configured to operate in a plurality of modes, including a pharmacy admin mode and a pharmacy agent mode. The apps include initial provisioning and refilling (IPAR) app, which can interface with a remote or local data source when running on the tablet 902, whether the tablet 902 is in wired, wireless, or waveguide communication with the remote data source. The tablet 902 can receive the IPAR app from a network-based data source, such as a server (e.g., physical, virtual, web, application, database), or from a memory load, such as via a memory stick, or others. The tablet 902 controls access to the modes based on a user login, which may be via passwords, two factor authentication, biometrics (e.g., fingerprints, retina scans), or others. In some embodiments, the tablet 902 controls access to the modes based on the user login into the IPAR app. The pharmacy admin mode grants an administrator level access to functionality of the tablet 902 and the apps hosted thereon, including the IPAR app. The pharmacy agent mode grants a limited user level access to functionality of the tablet 902 such that the tablet 902 is operated in a kiosk mode involving the IPAR app. For example, in the pharmacy agent mode, a user may be prevented from accessing any, some, most, or all apps other than the IPAR app. Note that the modes may display various visually distinct indicia notifying of what mode the tablet 902 is operating in. For example, the visual indicia can include icons, alphanumeric labels, graphics, images, watermarks, backgrounds, fonts, or any other visual elements, where the visual indicia differ between the modes.
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Note that all aspects, characteristics, or components of initial provisioning or refilling of a medical device, as described herein, or all uses (e.g., prevention, diagnosis, monitoring, amelioration, or therapy related mechanical, thermal, acoustic, optical, vibratory, digital, data, or electronic acts) of the medical device, as described herein, or all uses of a storage medium (e.g., access, read, write, modify, copy, delete, format, encrypt, decrypt, load, unload, send, receive) can be written or uploaded to a block of a blockchain local to or remote from the medical device or the storage medium. For example, the system 100A can include or communicate with a node of a blockchain of a blockchain network. The node can enable writing, reading, modifying, copying, or deleting operations relative to a block of the blockchain. These operations can track initial provisioning, refilling, or all usages of the medical device or the storage medium for at least medical device or storage medium recordkeeping purposes (e.g., EMR, prescription, billing, device maintenance, device updates, system security).
The neurostimulator 700 includes a housing 702, a display 704, a plurality of stimulation surfaces 706, a power button 708, a cap 712, and a control button 714 and may include all or some of the features described above in this application. In some embodiments, the neurostimulator 700 includes a speaker housed via the housing 702 and powered via the battery. In some embodiments, the neurostimulator 700 includes a microphone housed via the housing 702 and powered via the battery. The housing 702 houses a signal generator and a battery. The housing 702 is opaque, but can be transparent. The battery powers the signal generator and the display. The power button 708 turns the neurostimulator 700 on and off. The button 708 can be a mechanical button or a touch-enabled surface, which can be haptic or configured to receive a touch input, a slide input, a gesture input, or others. The stimulation surfaces 706 contact a skin of a patient and conduct a stimulation energy, such as an electrical current, an electrical impulse, an actuation, or others, from the signal generator to the skin of the patient.
The display 704, which can present in monochrome, grayscale, or color, indicates a status of the neurostimulator 700, such as on, off, charging, dosage amount total, dosage amount remaining, stimulation time total, stimulation time remaining, or others. The display 704 can be of any type, such as a segment display, a liquid crystal display (LCD), an electrophoretic display, a field emission display (FED), or others, whether rigid, elastic, resilient, bendable, or flexible. The display 704 can be configured to receive a touch-input, including a gesture, a slide, or others. The cap 712 is mounted to the housing 702, such as via snug fit, friction, fastening, mating, adhering, or others. The cap 712 is transparent, but can be opaque. The cap 712 covers and protects the stimulation surfaces 706 from mechanical damage, interference, moisture, or others. The control button 714 is operably coupled to the signal generator and is thereby configured to increase or decrease an intensity of the stimulation by controlling the signal generator. The control button 714 can be a mechanical button or a touch-enabled surface, which can be haptic or configured to receive a touch input, a slide input, a gesture input, or others. The neurostimulator 700 can be charged via a charging station 716, whether in a wired, wireless, or waveguide manner.
For example, the neurostimulator 700 can be a multi-use, hand-held, rechargeable, portable device comprising of a rechargeable battery, a set of signal-generating and amplifying electronics, and a control button for operator control of a signal amplitude. The device provides visible (display) and audible (beep) feedback on the device and stimulation status. A pair of stainless steel surfaces, which are a set of skin contact surfaces, allows a delivery of an electrical signal. The patient applies an electrode gel to the contact surfaces to maintain an uninterrupted conductive path from the contact surfaces to the skin on the neck of the patient. The stimulation surfaces are capped when not in use. The neurostimulator 700 can produce a low voltage electric signal including about five 5,000 Hz electric pulses (or less or more) that are repeated at a rate of 25 Hz (or less or more). A waveform of the electric pulses is approximately a sine wave with a peak voltage limited to about 24 volts (or less or more) when placed on the skin of the neck of the patient and a maximum output current of 60 mA (or less or more). The signal is transmitted through the skin of the neck to the vagus nerve. The neurostimulator 700 allows the patient to appropriately position and adjust a stimulation intensity as instructed a healthcare provider. Further details of appropriate waveforms and electrical signals and how to generate and transmit such signals to a desired nerve can be found in U.S. Pat. Nos. 8,874,205; 9,333,347; 9,174,066; 8,914,122 and 9,566,426, which are incorporated herein in their entireties by reference for at least these purposes as if copied and pasted herein, as disclosed herein, and for all purposes as if copied and pasted herein, such as all structures, all functions, and all methods of manufacture and use, as disclosed therein. Each dose can be applied for two minutes, after which the neurostimulator automatically stops delivering the neurostimulation. The neurostimulator 700 can allow for single or multiple uses or sessions. The neurostimulator can deliver a fixed number of treatments within a 24-hour period (or less or more). Once a maximum daily number of treatments has been reached, the neurostimulator 700 will not deliver any more treatments until a following 24-hour period expires. The neurostimulator can be charged via a charging station. The neurostimulator can allow for a fixed number of treatments within a defined time period, such as thirty one days or ninety three days, or some other period of time.
Each dose can be applied for two minutes, after which the neurostimulator automatically stops delivering the neurostimulation. The neurostimulator 700 can allows for multiple treatments. The neurostimulator can deliver a fixed number of treatments within a 24-hour period. Once a maximum daily number of treatments has been reached, the neurostimulator 700 will not deliver any more treatments until a following 24-hour period expires. The neurostimulator can be charged via a charging station. The neurostimulator can allow for a fixed number of treatments within a defined time period, such as thirty-one days or ninety-three days, or some other period of time.
The display 704 is able to present a plurality of symbols that are informative of various states of the neurostimulator 700. As such,
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Reproducibility of the effects of electrical stimulation of a nerve, such as a vagus nerve, depends in part on one's ability to position the electrode surfaces to an optimal location on the patient's skin during successive stimulation sessions. Some methods for repositioning the stimulation device during subsequent sessions are described and disclosed. The methods that are described and disclosed below involve initially determining an optimal position for the stimulator by imaging the nerve with ultrasound, then marking that position on the patient's skin with spots of dyes (“tattoos”), and eventually repositioning the stimulation device in conjunction with imaging the spots of dyes with the rear camera of the smartphone.
The ultrasound transducer/probe used to image the vagus nerve (or other stimulated nerve) is a “hockey stick” style of probe, so-called because of its shape, which is commercially available from most ultrasound machine manufacturers. As an example, the Hitachi Aloka UST-536 19 mm Hockey Stick style Transducer for superficial viewing has a frequency range of 6-13 MHz, a scan angle of 90 degrees, and a probe surface area of approximately 19 mm.times.4 mm (Hitachi Aloka Medical America, 10 Fairfield Boulevard, Wallingford Conn. 06492). The transducer connects to the ultrasound machine that displays the anatomical structures that lie under the transducer.
A neck skin location for electrically stimulating the vagus nerve is determined preliminarily by positioning an ultrasound probe at the location where the center of each smartphone electrode will be placed (33 in
It is understood that any non-toxic dye may be used to permanently mark a location on the patient's skin. However, one type of permanent dye that can be used is a fluorophore that is only visible or detectable as a spot on the patient's neck when one shines non-visible light upon it, e.g., ultraviolet light (“blacklight”) or infrared light. This is because the patient is thereby spared the embarrassment of explaining why there would otherwise be a visible spot mark on his or her neck, and also because such a dye is suitable for showing where to place the stimulator irrespective of whether the patient is dark-skinned or light-skinned. Another method, which is to attempt to match the color of the dye to the patient's flesh color, would be generally impractical. Marking with a fluorescent dye (e.g., from ordinary highlighting pens) has been performed previously by surgeons and radiologists to outline where a procedure is to be performed. However, the marking can be different in that it is intended to be used repeatedly by a patient alone for device positioning at small discrete spots [DAVID, J. E., Castle, S. K. B., and Mossi, K. M. Localization tattoos: an alternative method using fluorescent inks. Radiation Therapist 15(2006):1-5, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; WATANABE M, Tsunoda A, Narita K, Kusano M, Miwa M. Colonic tattooing using fluorescence imaging with light-emitting diode-activated indocyanine green: a feasibility study. Surg Today 39(3, 2009):214-218, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein].
Once the position-indicating fluorescent spots have been applied on the patient's skin as described above, they may fade and eventually disappear as the stained outer surface of the patient's skin exfoliates. The exfoliation will occur naturally as the patient washes his or her neck and may be accelerated by mechanical (e.g., abrasive) or chemical methods that are routinely used by cosmetologists. Before the spot disappears, the patient or a family member may reapply the dye/fluorophor to the same spot while observing it with ultraviolet or infrared light (as the case may be), by masking the skin outside the spot and then applying new dye solution directly with a cotton swab. Viewing of the fluorescence that is excited by ultraviolet light can be done with the naked eye because it comprises blue light, and viewing of fluorescence that is excited by infrared light can be done with a conventional digital camera after removing the camera's IR-blocking filter. For some cameras, removal of an IR-blocking filter may not be necessary (e.g., those that can perform retinal biometric scans). Some of the infrared fluorescent dyes may also be faintly visible to the naked eye even under room light, depending on their concentration (e.g., indocyanine green).
Alternatively, a semi-permanent or permanent tattooing method of marking or re-marking the fluorescent spots may be used by a licensed professional tattooer, by injecting the dye/fluorophor into an outer skin layer or deeper into the skin [Maria Luisa Perez-COTAPOS, Christa De Cuyper, and Laura Cossio. Tattooing and scarring: techniques and complications. In: Christa de Cuyper and Maria Luisa Cotapos (Eds.). Dermatologic Complications with Body Art: Tattoos, Piercings and Permanent Make-Up. Berlin and London: Springer, 2009, pp. 31-32, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein].
Many dyes can be used for the ultraviolet marking, but some of the more convenient ones for skin-surface marking are those that are commercially available to hand-stamp attendees of events. For tattooing applications, ultraviolet-absorbing injectable fluorophores are commercially available that are encapsulated within microspheres [Technical sheet for Opticz UV Blacklight Reactive Blue Invisible Ink. 2013. Blacklight.com, 26735 W Commerce Dr Ste 705, Volo, III. 60073-9658, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; Richard P. HAUGLAND. Fluorophores excited with UV light. Section 1.7 In: The Molecular Probes Handbook: A Guide to Fluorescent Probes and Labeling Technologies, 11th Edition, 2010. Molecular Probes/Life Technologies. 4849 Pitchford Ave., Eugene, Oreg. 97402. pp. 66-73, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; Technical sheet for BIOMATRIX System. 2013. NEWWEST Technologies, Santa Rosa Calif. 95407-0286, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein].
Many dyes can also be used for the infrared marking, one of their major advantages being that auto-fluorescence from human skin or tissue generally does not interfere with detection of their fluorescence. In fact, the infrared fluorophores may be imaged up to about two centimeters under the skin. Examples of such dyes are indocyanine green and Alexa Fluor 790. Quantum dots may also be used to generate infrared fluorescence, advantages of which are that they are very stable and very brightly fluorescent. They may also be encapsulated in microspheres for purposes of tattooing. Quantum dots may also be electroluminescent, such that the electric field and currents produced by the stimulator might alone induce the emission of infrared light from the quantum dots [Richard P. HAUGLAND. Alexa Fluor Dyes Spanning the Visible and Infrared Spectrum—Section 1.3; and Qdot Nanocrystals—Section 6.6. In: The Molecular Probes Handbook: A Guide to Fluorescent Probes and Labeling Technologies, 11th Edition, 2010, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein, Molecular Probes/Life Technologies. 4849 Pitchford Ave., Eugene, Oreg. 97402; GRAVIER J, Navarro F P, Delmas T, Mittler F, Couffin A C, Vinet F, Texier I. Lipidots: competitive organic alternative to quantum dots for in vivo fluorescence imaging. J Biomed Opt. 16(9, 2011):096013, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; ROMOSER A, Ritter D, Majitha R, Meissner K E, McShane M, Sayes C M. Mitigation of quantum dot cytotoxicity by microencapsulation. PLoS One. 6(7, 2011):e22079:pp. 1-7, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein; Andrew M. SMITH, Michael C. Mancini, and Shuming Nie. Second window for in vivo imaging. Nat Nanotechnol 4(11, 2009): 710-711, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein].
Once the patient is ready to apply the stimulator to the neck (as shown in figures herein), he or she will place a snap-in optical attachment (50 in
Once the snap-in optical attachment is in place, apertures are formed between the optical attachment and the rear camera/flash, as indicated by 34′ and 35′ in
In order to produce fluorescence from the fluorescent dye in the patient's skin, the dye should be illuminated with wavelengths corresponding to peaks in its excitation spectrum. In some embodiments, infrared illumination causes the dye (e.g., indocyanine green) to fluoresce at a wavelength greater than 820 nm, and the LED may be used to illuminate the dye at its excitation wavelength near 760 or 785 nm. Because the LED found in some smartphone cameras may only generate light predominantly in the visible range (e.g. about 400-700 nm), the optical components shown in
Note that the foregoing description presumes that there is a gap between the macro lens 56 and the patient's skin 58, such that the excitation wavelengths of light may pass under the macro lens to wherever the infrared dye 59 may be located. This would generally be the case because the height of the electrode surfaces (33′ in FIGS. 21A and 21B) prevent the macro lens 56 from reaching the surface of the patient's skin. However, even if the macro lens 56 were pressed all the way to the surface of the skin, a spot of fluorescent dye 59 could still be excited by the light if it had been injected deeper than the surface of the skin. This is because infrared light may penetrate up to about 2 cm through the skin.
In the event that the LED 43 produces light with wavelengths that are suitable for excitation of the fluorescent dye, then the phosphorescent layer 52 that is shown in
During initial testing of the stimulator on the patient, the appropriate snap-in optical attachment will be in place (as described above), and the smartphone's camera will be turned on, while electrical impulses from the electrode surfaces 33 are applied to the patient's skin. If the electrodes are near their optimal position on the patient's skin, the fluorescent spots that had been applied to the patient's skin should then appear in an image produced by the smartphone's camera, viewable on the screen of the smartphone (31). The electrodes may then be slightly translated, rotated, and depressed into the patient's skin, until a maximum therapeutic response is achieved. Methods for evaluating the response at a particular stimulator setting were disclosed in a commonly assigned, co-pending application U.S. Ser. No. 13/872,116 (publication No. US20130245486), entitled DEVICES AND METHODS FOR MONITORING NON-INVASIVE VAGUS NERVE STIMULATION, to SIMON et al, the disclosure of which is incorporated herein by reference for all purposes as if copied and pasted herein. Once the maximum therapeutic position of the electrodes has been decided, a reference image of the fluorescent spots will then be recorded at that position and saved in the memory of the smartphone for future reference.
During subsequent sessions when the patient applies the stimulator to his or her skin, the appropriate snap-in optical attachment will also be in place, and the smartphone's camera will be turned on, while electrical impulses from the electrode surfaces 33 are applied to the patient's skin. The fluorescent spots that had been applied to the patient's skin should then also appear in an image produced by the smartphone's camera, viewable on the screen of the smartphone (31). By superimposing the currently viewed image of the fluorescent spots onto the previously recorded reference image of the fluorescent spots, one may then ascertain the extent to which the current position, orientation, and depth-into-the-skin of the electrode surfaces match the previously recorded optimal reference position. This is illustrated in
Various terminology used herein can imply direct or indirect, full or partial, temporary or permanent, action or inaction. For example, when an element is referred to as being “on,” “connected” or “coupled” to another element, then the element can be directly on, connected or coupled to the other element and/or intervening elements can be present, including indirect and/or direct variants. In contrast, when an element is referred to as being “directly connected” or “directly coupled” to another element, there are no intervening elements present.
Although the terms first, second, etc. can be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not necessarily be limited by such terms. These terms are used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer, or section discussed below could be termed a second element, component, region, layer, or section without departing from various teachings of this disclosure.
Various terminology used herein is for describing particular example embodiments and is not intended to be necessarily limiting of this disclosure. As used herein, various singular forms “a,” “an” and “the” are intended to include various plural forms as well, unless a context clearly indicates otherwise. Various terms “comprises,” “includes” and/or “comprising,” “including” when used in this specification, specify a presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence and/or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
As used herein, a term “or” is intended to mean an inclusive “or” rather than an exclusive “or.” That is, unless specified otherwise, or clear from context, “X employs A or B” is intended to mean any of a set of natural inclusive permutations. That is, if X employs A; X employs B; or X employs both A and B, then “X employs A or B” is satisfied under any of the foregoing instances.
Features described with respect to certain example embodiments can be combined and sub-combined in and/or with various other example embodiments. Also, different aspects and/or elements of example embodiments, as disclosed herein, can be combined and sub-combined in a similar manner as well. Further, some example embodiments, whether individually and/or collectively, can be components of a larger system, wherein other procedures can take precedence over and/or otherwise modify their application. Additionally, a number of steps can be required before, after, and/or concurrently with example embodiments, as disclosed herein. Note that any and/or all methods and/or processes, at least as disclosed herein, can be at least partially performed via at least one entity in any manner.
Example embodiments of this disclosure are described herein with reference to illustrations of idealized embodiments (and intermediate structures) of this disclosure. As such, variations from various illustrated shapes as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, various example embodiments of this disclosure should not be construed as necessarily limited to various particular shapes of regions illustrated herein, but are to include deviations in shapes that result, for example, from manufacturing.
Any and/or all elements, as disclosed herein, can be formed from a same, structurally continuous piece, such as being unitary, and/or be separately manufactured and/or connected, such as being an assembly and/or modules. Any and/or all elements, as disclosed herein, can be manufactured via any manufacturing processes, whether additive manufacturing, subtractive manufacturing, and/or other any other types of manufacturing. For example, some manufacturing processes include three dimensional (3D) printing, laser cutting, computer numerical control routing, milling, pressing, stamping, vacuum forming, hydroforming, injection molding, lithography, and so forth.
Any and/or all elements, as disclosed herein, can be and/or include, whether partially and/or fully, a solid, including a metal, a mineral, an amorphous material, a ceramic, a glass ceramic, an organic solid, such as wood and/or a polymer, such as rubber, a composite material, a semiconductor, a nanomaterial, a biomaterial and/or any combinations thereof. Any and/or all elements, as disclosed herein, can be and/or include, whether partially and/or fully, a coating, including an informational coating, such as ink, an adhesive coating, a melt-adhesive coating, such as vacuum seal and/or heat seal, a release coating, such as tape liner, a low surface energy coating, an optical coating, such as for tint, color, hue, saturation, tone, shade, transparency, translucency, opaqueness, luminescence, reflection, phosphorescence, anti-reflection and/or holography, a photo-sensitive coating, an electronic and/or thermal property coating, such as for passivity, insulation, resistance or conduction, a magnetic coating, a water-resistant and/or waterproof coating, a scent coating and/or any combinations thereof. Any and/or all elements, as disclosed herein, can be rigid, flexible, and/or any other combinations thereof. Any and/or all elements, as disclosed herein, can be identical and/or different from each other in material, shape, size, color and/or any measurable dimension, such as length, width, height, depth, area, orientation, perimeter, volume, breadth, density, temperature, resistance, and so forth.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in an art to which this disclosure belongs. Various terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with a meaning in a context of a relevant art and should not be interpreted in an idealized and/or overly formal sense unless expressly so defined herein.
Furthermore, relative terms such as “below,” “lower,” “above,” and “upper” can be used herein to describe one element's relationship to another element as illustrated in the set of accompanying illustrative drawings. Such relative terms are intended to encompass different orientations of illustrated technologies in addition to an orientation depicted in the set of accompanying illustrative drawings. For example, if a device in the set of accompanying illustrative drawings were turned over, then various elements described as being on a “lower” side of other elements would then be oriented on “upper” sides of other elements. Similarly, if a device in one of illustrative figures were turned over, then various elements described as “below” or “beneath” other elements would then be oriented “above” other elements. Therefore, various example terms “below” and “lower” can encompass both an orientation of above and below.
As used herein, a term “about” and/or “substantially” refers to a +/−10% variation from a nominal value/term. Such variation is always included in any given value/term provided herein, whether or not such variation is specifically referred thereto.
If any disclosures are incorporated herein by reference and such disclosures conflict in part and/or in whole with this disclosure, then to an extent of a conflict, if any, and/or a broader disclosure, and/or broader definition of terms, this disclosure controls. If such disclosures conflict in part and/or in whole with one another, then to an extent of a conflict, if any, a later-dated disclosure controls.
In some embodiments, various functions or acts can take place at a given location and/or in connection with the operation of one or more apparatuses or systems. In some embodiments, a portion of a given function or act can be performed at a first device or location, and a remainder of the function or act can be performed at one or more additional devices or locations.
Various corresponding structures, materials, acts, and equivalents of all means or step plus function elements in various claims below are intended to include any structure, material, or act for performing the function in combination with other claimed elements as specifically claimed. Various embodiments were chosen and described in order to best explain various principles of this disclosure and various practical applications thereof, and to enable others of ordinary skill in a pertinent art to understand this disclosure for various embodiments with various modifications as are suited to a particular use contemplated.
Various diagrams depicted herein are illustrative. There can be many variations to such diagrams or steps (or operations) described therein without departing from various spirits of this disclosure. For instance, various steps can be performed in a differing order or steps can be added, deleted or modified. All of these variations are considered a part of this disclosure. People skilled in an art to which this disclosure relates, both now and in future, can make various improvements and enhancements which fall within various scopes of various claims which follow.
This patent application is a Continuation of U.S. Nonprovisional application Ser. No. 16/229,401, filed Dec. 21, 2018, which is a Continuation-in-Part of U.S. Nonprovisional application Ser. No. 16/229,299 filed 21 Dec. 2018; which claims the benefit of U.S. Provisional Application No. 62/609,807 filed 22 Dec. 2017; all of which are hereby incorporated by reference for all purposes as if copied and pasted herein. This patent application is also a Continuation-in-Part of U.S. Nonprovisional application Ser. No. 14/335,726 filed 18 Jul. 2014; which is a (1) Continuation-in-Part of U.S. Nonprovisional application Ser. No. 14/292,491 filed 30 May 2014, now U.S. Pat. No. 9,375,571 issued 28 Jun. 2016; which claims the benefit of U.S. Provisional Application No. 62/001,004 filed 20 May 2014; and is a (2) Continuation-in-Part of U.S. Nonprovisional application Ser. No. 13/858,114 filed 8 Apr. 2013, now U.S. Pat. No. 9,248,286 issued 2 Feb. 2016; which claims the benefit of U.S. Provisional Application No. 61/752,895 filed 15 Jan. 2013; all of which are hereby incorporated by reference for all purposes as if copied and pasted herein. This patent application is also a Continuation-in-Part of U.S. Nonprovisional application Ser. No. 16/597,188, filed Oct. 9, 2019, which is a Continuation of U.S. Nonprovisional application Ser. No. 14/930,490 filed 2 Nov. 2015 (now U.S. Pat. No. 10,507,325); which is a Continuation of U.S. Nonprovisional application Ser. No. 13/222,087 filed 31 Aug. 2011, now U.S. Pat. No. 9,174,066 issued 3 Nov. 2015; which is a Continuation-in-Part of U.S. Nonprovisional application Ser. No. 13/183,765 filed 15 Jul. 2011, now U.S. Pat. No. 8,874,227 issued 28 Oct. 2014; which (1) claims the benefit of U.S. Provisional Application No. 61/488,208 filed 20 May 2011; and (2) which is a Continuation-in-Part of U.S. Nonprovisional application Ser. No. 13/183,721 filed 15 Jul. 2011, now U.S. Pat. No. 8,676,324 issued 18 Mar. 2014; which (1) claims the benefit of U.S. Provisional Application No. 61/487,439 filed 18 May 2011 and (2) is a Continuation-in-Part of U.S. Nonprovisional application Ser. No. 13/109,250 filed 17 May 2011, now U.S. Pat. No. 8,676,330 issued 18 Mar. 2014; which (1) claims the benefit of U.S. Provisional Application No. 61/471,405 filed 4 Apr. 2011 and (2) is a Continuation-in-Part of U.S. Nonprovisional application Ser. No. 13/075,746 filed 30 Mar. 2011, now U.S. Pat. No. 8,874,205 issued 28 Oct. 2014; which (1) claims the benefit of U.S. Provisional Application No. 61/451,259 filed 10 Mar. 2011 and (2) is a Continuation-in-Part of U.S. Nonprovisional application Ser. No. 13/005,005 filed 12 Jan. 2011, now U.S. Pat. No. 8,868,177 issued 21 Oct. 2014; which is a Continuation-in-Part of U.S. Nonprovisional application Ser. No. 12/964,050 filed 9 Dec. 2010; which (1) claims the benefit of U.S. Provisional Application No. 61/415,469 filed 19 Nov. 2010 and (2) which is a Continuation-in-Part of U.S. Nonprovisional application Ser. No. 12/859,568 filed 19 Aug. 2010, now U.S. Pat. No. 9,037,247 issued 19 May 2015. This patent application is also a Continuation-in-Part of U.S. Nonprovisional application Ser. No. 15/149,406 filed 9 May 2016; which is a Divisional of U.S. Nonprovisional application Ser. No. 14/337,930 filed 22 Jul. 2014, now U.S. Pat. No. 9,333,347 issued 10 May 2016; which is a Continuation of U.S. Nonprovisional application Ser. No. 13/075,746 filed 30 Mar. 2011, now U.S. Pat. No. 8,874,205 issued 28 Oct. 2014; which (1) claims the benefit of U.S. Provisional Application No. 61/451,259 filed 10 Mar. 2011 and (2) is a Continuation-in-Part of U.S. Nonprovisional application Ser. No. 12/964,050 filed 9 Dec. 2010; which (1) claims the benefit of U.S. Provisional Application No. 61/415,469 filed 19 Nov. 2010 and (2) is a Continuation-in-Part of Ser. No. 12/859,568 filed 19 Aug. 2010, now U.S. Pat. No. 9,037,247 issued 19 May 2015; all of which are hereby incorporated by reference for all purposes as if copied and pasted herein. This patent application is also a Continuation-in-Part of U.S. Nonprovisional application Ser. No. 16/338,392, filed Apr. 18, 2019, which is a Continuation of Ser. No. 14/462,605 filed 19 Aug. 2014 (now U.S. Pat. No. 10,265,523); all of which are hereby incorporated by reference for all purposes as if copied and pasted herein.
| Number | Date | Country | |
|---|---|---|---|
| 62609807 | Dec 2017 | US | |
| 62001004 | May 2014 | US | |
| 61752895 | Jan 2013 | US | |
| 61488208 | May 2011 | US | |
| 61487439 | May 2011 | US | |
| 61471405 | Apr 2011 | US | |
| 61451259 | Mar 2011 | US | |
| 61415469 | Nov 2010 | US | |
| 61451259 | Mar 2011 | US | |
| 61415469 | Nov 2010 | US | |
| 61415469 | Nov 2010 | US |
| Number | Date | Country | |
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| Parent | 14337930 | Jul 2014 | US |
| Child | 15149406 | US |
| Number | Date | Country | |
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| Parent | 16229401 | Dec 2018 | US |
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| Parent | 13222087 | Aug 2011 | US |
| Child | 14930490 | US | |
| Parent | 13075746 | Mar 2011 | US |
| Child | 14337930 | US | |
| Parent | 13005005 | Jan 2011 | US |
| Child | 14462605 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 16229299 | Dec 2018 | US |
| Child | 16229401 | US | |
| Parent | 14335726 | Jul 2014 | US |
| Child | 16229401 | US | |
| Parent | 14292491 | May 2014 | US |
| Child | 14335726 | US | |
| Parent | 13858114 | Apr 2013 | US |
| Child | 14335726 | US | |
| Parent | 14930490 | Nov 2015 | US |
| Child | 16229401 | US | |
| Parent | 13183765 | Jul 2011 | US |
| Child | 13222087 | US | |
| Parent | 13183721 | Jul 2011 | US |
| Child | 13183765 | US | |
| Parent | 13109250 | May 2011 | US |
| Child | 13183721 | US | |
| Parent | 13075746 | Mar 2011 | US |
| Child | 13109250 | US | |
| Parent | 13005005 | Jan 2011 | US |
| Child | 13075746 | US | |
| Parent | 12964050 | Dec 2010 | US |
| Child | 13005005 | US | |
| Parent | 12859568 | Aug 2010 | US |
| Child | 12964050 | US | |
| Parent | 12612177 | Nov 2009 | US |
| Child | 12859568 | US | |
| Parent | 12408131 | Mar 2009 | US |
| Child | 12612177 | US | |
| Parent | 15149406 | May 2016 | US |
| Child | 16229401 | US | |
| Parent | 12964050 | Dec 2010 | US |
| Child | 13075746 | US | |
| Parent | 12859568 | Aug 2010 | US |
| Child | 12964050 | US | |
| Parent | 14462605 | Aug 2014 | US |
| Child | 16229401 | US | |
| Parent | 12964050 | Dec 2010 | US |
| Child | 13005005 | US | |
| Parent | 12859568 | Aug 2010 | US |
| Child | 12964050 | US | |
| Parent | 12408131 | Mar 2009 | US |
| Child | 12859568 | US |
