Patent Grant
11857778
Some embodiments of the invention relate generally to the treatment of inflammatory diseases, including those of the gastrointestinal tract such as inflammatory bowel disease (e.g., Crohn's disease, microscopic colitis, or ulcerative colitis), celiac sprue, primary biliary cirrhosis, primary sclerosing cholangitis, autoimmune hepatitis, and the like; or systemic or other local inflammatory disease such as rheumatoid arthritis, systemic lupus erythematosis, systemic sclerosis, and Sjogren's syndrome through neuromodulation (such as noninvasive peripheral nerve stimulation).
Inflammatory bowel disease (IBD) is a group of organic diseases, classically divided into Crohn's disease (CD) and ulcerative colitis (UC), involving the gastrointestinal (GI) tract, particularly the colon and small intestine for CD, starting early in life (between 15 and 30 years) and evolving by alternating periods of flares and remissions of variable duration. Symptoms are characterized by abdominal pain, diarrhea, fever, weight loss and extra-intestinal (skin, eyes, joints) manifestations. IBD is conventionally treated by various pharmacologic therapies, including non-steroidal anti-inflammatory agents, steroids, monoclonal antibodies, and other immunomodulators, all of which carry the risk of potential side effects. New therapies that may have increased efficacy and/or decreased side effects are needed.
Some embodiments of the present invention relate generally to the treatment of inflammatory diseases, autoimmune diseases, and/or diseases involving the gastrointestinal tract, and in some cases specifically to systems and methods of treating inflammatory bowel diseases, including but not limited to ulcerative colitis, Crohn's disease, and microscopic colitis, through neuromodulation (such as noninvasive peripheral nerve stimulation). Microscopic colitis includes, for example, collagenous colitis and lymphocytic colitis.
In some embodiments, other gastrointestinal-related diseases including irritable bowel syndrome, autoimmune gastrointestinal dysmotility (AGID), esophagitis, gastritis, duodenitis, ischemic colitis, celiac sprue, Whipple's disease, peptic ulcer disease, pancreatitis, hepatitis including autoimmune hepatitis, non-alcoholic steatohepatitis (NASH), cholecystitis, primary biliary cirrhosis, primary sclerosing cholangitis, hemochromatosis, and Wilson's disease can be treated using systems and methods as disclosed herein.
Inflammation of the gastrointestinal tract (e.g., colon and/or small intestine, including the duodenum, jejunum, and ileum; stomach; and/or the esophagus) is treated in several embodiments. In some embodiments, gastric acid and/or bile secretion and/or absorption is regulated via neuromodulation to, for example, beneficially affect intestinal inflammation and/or motility. In some embodiments, pancreatic enzyme secretion is altered to treat IBD, IBS and other GI conditions such as disclosed herein. In some embodiments neuromodulation as disclosed herein can modulate (increase or decrease) the release or effects of a GI-related hormone, peptide, chemical, or other agent including but not limited to bile acid, pancreatic enzyme, gastrin, secretin, cholecystokinin (CCK), vasointestinal peptide (VIP), enterocrinin, motilin, vilikinin, somatostatin, and/or gastric acid, by about or at least about 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 60%, 70%, 80%, 90%, 100%, or more, or incorporating two of the aforementioned values. In some embodiments, neuromodulation can treat or prevent fecal incontinence, or increase or decrease GI motility to treat, for example, gastroparesis, ileus, large or small bowel obstruction, constipation, or diarrhea.
In some embodiments, systems and methods as disclosed herein can treat systemic autoimmune diseases, including but not limited to, rheumatoid arthritis, systemic lupus erythematosus, alopecia areata, ankylosing spondylitis, antiphospholipid syndrome, autoimmune Addison's disease, autoimmune hemolytic anemia, autoimmune hepatitis, autoimmune inner ear disease, autoimmune lymphoproliferative syndrome (alps), autoimmune thrombocytopenic purpura (ATP), Behcet's disease, bullous pemphigoid, cardiomyopathy, celiac sprue-dermatitis, chronic fatigue syndrome immune deficiency, syndrome (CFIDS), chronic inflammatory demyelinating polyneuropathy, cicatricial pemphigoid, cold agglutinin disease, Crest syndrome, Crohn's disease, Degos disease, dermatomyositis, juvenile dermatomyositis, discoid lupus, essential mixed cryoglobulinemia, fibromyalgia-fibromyositis, Graves' disease, Guillain-Barre syndrome, Hashimoto's thyroiditis, idiopathic pulmonary fibrosis, idiopathic thrombocytopenia purpura (ITP), IgA nephropathy, insulin dependent diabetes (Type I), juvenile rheumatoid arthritis (JRA), Meniere's disease, mixed connective tissue disease, multiple sclerosis, myasthenia gravis, pemphigus vulgaris, pernicious anemia, polyarteritis nodosa, polychondritis, polyglandular syndromes, polymyalgia rheumatica, polymyositis and dermatomyositis, primary agammaglobulinemia, primary biliary cirrhosis, psoriasis, Raynaud's phenomenon, Reiter's syndrome, rheumatic fever, sarcoidosis, scleroderma, Sjogren's syndrome, stiff-man syndrome, Takayasu arteritis, temporal arteritis/giant cell arteritis, ulcerative colitis, uveitis, vasculitis, vitiligo, and Wegener's granulomatosis.
In some embodiments, disclosed herein is a system for treating inflammatory bowel diseases in a patient. The system can include a peripheral nerve stimulator including a pulse generator and at least two, three, or more electrodes configured to deliver electrical stimulation to one, two, three, or more nerves, acupressure points, or meridians in the patient's limbs, and spaced apart from the patient's abdomen and related GI organs. The stimulation can be sufficient in some embodiments to change, e.g., reduce or improve one or more of: mRNA proinflammatory cytokines (e.g., IL-1, IL-2, IL-6, IL-8, TNFα), myeloperoxidase activity (MPOA), macroscopic index of colitis, clinical disease index, endoscopic index, erythrocyte sedimentation rate (ESR), C-reactive protein, fecal calprotectin, symptoms such as pain (such as abdominal pain or cramping), nausea, vomiting, diarrhea, constipation, or gastrointestinal transit. In some embodiments, inflammatory cytokines, biomarkers, or other indexes including those noted above are reduced or improved post-treatment with the devices disclosed herein by at least about 5%, 10-20%, 20-40%, 40-60% or more (including overlapping ranges therein) compared to pre-treatment.
The method can include, in some embodiments, any number of the following: positioning a first peripheral nerve effector on the patient's skin to stimulate a first peripheral nerve target of the patient; positioning a second peripheral nerve effector on the patient's skin to stimulate the a second nerve target of the patient; delivering a first electrical nerve stimulation signal transcutaneously to the first nerve through the first peripheral nerve effector; delivering a second electrical nerve stimulation signal transcutaneously to the second nerve through the second peripheral nerve effector; receiving an input relating to autonomic nervous system activity of the patient; and modifying at least one brain, brain stem, or spinal cord autonomic circuit relating to the inflammation response of a patient based on the input to balance parasympathetic and sympathetic nervous system activity of the patient. In some embodiments, the first nerve can be the tibial nerve, and the second nerve can be the saphenous nerve. In other embodiments, the first nerve can be the auricular vagus nerve and the second nerve can be the median nerve. In some embodiments, the method does not utilize any implantable components, and only involves transcutaneous stimulation. The first electrical stimulation signal can be different from the second electrical stimulation signal. The first electrical stimulation signal can have a first frequency different from a second frequency of the second electrical stimulation signal. The first electrical stimulation signal can have an amplitude different from the second electrical stimulation signal. The first or second frequency can be, for example, from about 5 Hz to about 20 Hz. The first or second frequency can be, for example, from about 10 Hz to about 100 Hz. Receiving an input relating to autonomic nervous system activity of the patient can include any number of the following: receiving data from a sensor that measures autonomic nervous system activity of the patient; receiving data from a sensor that measures heart rate variability of the patient; receiving heart rate variability data from an optical sensor measuring blood flow characteristics and disposed proximate a vessel proximate a wrist, knee, ankle, or ear of the patient; receiving data from a sensor that measures galvanic skin response of the patient; receiving data relating to inflammatory symptoms of the patient; and/or receiving data relating to bowel events of the patient, which can include bowel movements, urgency, and incontinence events. In some embodiments, stimulation, e.g., transcutaneous stimulation of a plurality of peripheral nerves that are remote from the abdomen and/or do not directly innervate the GI tract, e.g., stomach or intestines can surprisingly and unexpectedly treat inflammatory bowel disease, other inflammatory diseases, and other medical conditions as disclosed elsewhere herein.
In some embodiments, disclosed herein is a method of treating symptoms associated with inflammatory bowel diseases in a patient. The method can include any number of the following: positioning a first electrode at a first location on a skin surface relative to a first afferent peripheral nerve; positioning a second electrode at a second location on the skin surface relative to a second afferent peripheral nerve; positioning a third electrode at a third location on the skin surface spaced apart from the first electrode and the second electrode; delivering a first stimulus to the first peripheral nerve through the first electrode; and delivering a second stimulus to the second peripheral nerve through the second electrode. In some embodiments, the third electrode is a single common return electrode to the first electrode and the second electrode. In some embodiments, the first electrode, second electrode, and third electrode are positioned such that electric fields between the first electrode and the third electrode pass through the first afferent peripheral nerve, and electric fields between the second electrode and the third electrode pass through the second afferent peripheral nerve. The first stimulus and the second stimulus can modify at least one brain, brain stem, or spinal cord autonomic circuit relating to gastrointestinal function. In some embodiments, the first afferent peripheral nerve comprises the tibial nerve. In some embodiments, the second afferent peripheral nerve comprises the saphenous nerve. In some embodiments, the first electrode, second electrode, and third electrode are all connected on a wearable device and positioned on the calf proximate to, and distal to the patient's knee, ankle, and/or foot; or positioned on the wrist or arm.
In some embodiments, disclosed herein is a method of treating symptoms associated with inflammatory bowel diseases in a patient. The method can include any number of the following: positioning a first pair of electrodes comprising an anode and a cathode at a first location on a skin surface relative to a first peripheral nerve; positioning a second pair of electrodes comprising an anode and a cathode at a second location on the skin surface relative to a second peripheral nerve; delivering a first stimulus to the first peripheral nerve through the first pair of electrodes; and delivering a second stimulus to the second peripheral nerve through the second pair of electrodes. In some embodiments, the first pair of electrodes and second pair of electrodes are positioned such that electric fields between the first pair of electrodes pass through the first peripheral nerve, and electric fields between the second pair of electrodes pass through the second peripheral nerve. The first stimulus and the second stimulus can modify at least one brain or spinal cord autonomic feedback loop relating to a particular physiologic function, such as immune system regulation for example.
In some embodiments, disclosed herein is a wearable device for treating gastrointestinal symptoms in a patient. The device can include any number of the following: a controller; a first peripheral nerve effector, comprising at least one stimulation electrode configured to be positioned to transcutaneously modulate a first afferent nerve pathway associated with the inflammation response of a patient; and a second peripheral nerve effector, comprising at least one stimulation electrode configured to be positioned to transcutaneously modulate a second afferent nerve pathway associated with the inflammation response of a patient; and at least one input source configured to provide feedback information. The controller can include a processor and a memory for receiving the real-time feedback information from the input source that, when executed by the processor, cause the device to adjust one or more parameters of a first electrical stimulus based at least in part on the feedback information; adjust one or more parameters of a second electrical stimulus based at least in part on the feedback information independent from the first electrical stimulus; deliver the first electrical stimulus to a first afferent nerve pathway through the first peripheral nerve effector to reduce gastrointestinal symptoms by modifying a first brain, brain stem, or spinal cord autonomic circuit relating to gastrointestinal function; and deliver the second electrical stimulus to a second afferent nerve pathway through the second peripheral nerve effector to reduce gastrointestinal symptoms by modifying a second brain, brain stem, or spinal cord autonomic circuit relating to gastrointestinal function. Adjusting the one or more parameters of the first electrical stimulus and the second electrical stimulus can contribute to balancing sympathetic and parasympathetic nervous system activity.
In some embodiments, systems and methods can include a wearable device with an electrically conductive skin interface that excite the underlying nerves from a transcutaneous surface stimulator. The device may be sized for a range of user sizes with stimulation electrodes positioned to target the appropriate nerves, as in the device described in, for example, U.S. Pat. No. 9,452,287 to Rosenbluth et al., U.S. Pat. No. 9,802,041 to Wong et al., PCT Pub. No. WO 2016/201366 to Wong et al., PCT Pub. No. WO 2017/132067 to Wong et al., PCT Pub. No. WO 2017/053847 to Hamner et al., PCT App. No. PCT/US2017/040920 to Wong et al., and PCT App. No. PCT/US2017/048424 to Rosenbluth et al. filed on Aug. 24, 2017, each of which is incorporated by reference in their entireties.
Some embodiments include a wearable system that uses transcutaneous sensory stimulation in order to improve symptoms of inflammatory bowel disease and/or fecal incontinence. In some embodiments, key factors of this system enable chronic, home-use to improve the efficacy of peripheral nerve stimulation by avoiding the inconvenience of frequent office visits and invasive aspects of using percutaneous or implanted nerve stimulation. Some embodiments can advantageously utilize transcutaneous neuromodulation of peripheral afferent nerve pathways to non-invasively affect brain, brain stem, or spinal cord pathways associated with the inflammation response in a patient.
Chronic peripheral nerve stimulation in a wearable form that can be integrated into activities of daily living, allowing full mobility and ease of use, can improve the efficacy of neuromodulation. However, home use of a percutaneous system can be inconvenient and technically difficult for the patient. Transcutaneous neuromodulation is a more suitable modality for home use but is currently limited by the form factor depending on the needs for chronic daily use. Furthermore, adding aspects of responsiveness and more frequent use could greatly improve the effectiveness and comfort of such a chronic use device.
The effects of peripheral nerve stimulation on inflammatory response and gastrointestinal function may occur only during the period of active stimulation or may outlast the stimulation period after stimulation has ceased. Different mechanisms such as the modulation of spinal reflexes or induction of brain or spinal plasticity can be responsible for these experimental and clinical observations. Furthermore, the onset of the effects of stimulation may occur acutely (e.g., during or immediately following therapy) or only after several stimulation sessions in a chronic manner. For example, the effect of transcutaneous tibial nerve stimulation on patient related outcomes is estimated at 4-6 weeks after the initiation of weekly stimulation sessions. Depending on the underlying mechanisms and the time course of beneficial effects, stimulation may require delivery in a continuous fashion such as in sacral nerve stimulation, in discrete scheduled sessions or in an on-demand, conditional manner.
In some embodiments, disclosed herein is a wearable device for inducing neural plasticity in a user with transcutaneous electrical stimulation of an afferent peripheral nerve. The device can include any number of a controller; a first peripheral nerve effector, comprising at least one stimulation electrode configured to be positioned to transcutaneously modulate a first afferent peripheral nerve; and at least one biomedical sensor or data input source configured to provide feedback information. The controller can include a processor and a memory for receiving the feedback information from the sensor, that when executed by the processor, cause the device to adjust one or more parameters of a first electrical stimulus based at least in part on the feedback information; and/or deliver the first electrical stimulus to the first afferent peripheral nerve to the first peripheral nerve effector. The first electrical stimulus can include patterned, such as burst (e.g., theta burst) electrical stimulation configured to induce neural plasticity. The stimulation can be continuous, intermittent, or intermediate theta burst stimulation in some embodiments. The device can also be configured to deliver a priming electrical nerve stimulation signal prior to the first electrical stimulation signal, which can be a non-theta burst stimulation signal. The device can further include a second peripheral nerve effector, including at least one stimulation electrode configured to be positioned to transcutaneously modulate a second afferent peripheral nerve, and is configured to deliver a second electrical nerve stimulation signal transcutaneously to the afferent peripheral nerve of the user. The signal can include, for example, electrical theta burst stimulation.
Also disclosed herein is a method for treating inflammatory bowel disease, that can include assessing at least one of sympathetic and parasympathetic activity of a subject and determining the presence of sympathetic or parasympathetic overactivity or underactivity in the subject; and stimulating a first peripheral nerve sufficient to have a therapeutic effect on the inflammatory response of a patient if abnormal sympathetic activity is present; and/or stimulating the a second peripheral nerve sufficient to have a therapeutic effect on inflammatory bowel disease if abnormal parasympathetic activity is present. In some embodiments, stimulating comprises only electrical transcutaneous stimulation. The stimulation can include inhibiting or exciting nerve activity of one, two, three or more peripheral nerve targets. Sympathetic and parasympathetic activity of a subject can include measuring heart rate variability (HRV), such as via a wrist-worn device. Other parameters such as heart rate and electrodermal activity can be measured in addition or alternatively. HRV can be measured during a predefined period of time, such as 24 hours, either prior to and/or after the initial stimulation.
Also disclosed herein in some embodiments is a method for treating inflammatory bowel disease, that can include electrically stimulating a first nerve associated with inflammatory response in a patient; assessing at least one of sympathetic and parasympathetic activity of a subject and determining the presence or absence of sympathetic or parasympathetic overactivity in the subject; assessing symptomatology of inflammatory bowel disease; and adjusting the electrical stimulation based upon assessing the at least one of sympathetic and parasympathetic activity and the symptomatology of inflammatory bowel disease. Adjusting the electrical stimulation can include, for example, identifying sympathetic or parasympathetic overactivity in the patient, and adjusting the frequency of stimulation of the first nerve; and/or discontinuing electrical stimulation of the first nerve associated with inflammatory response in a patient; and initiating electrical stimulation of a second nerve associated with inflammatory response in a patient. In some embodiments, current level can be held constant as frequency is adjusted to maximize activation. In some embodiments, pulse width can be held constant as frequency is adjusted to maximize activation. In some embodiments, current level and pulse width can be held constant as frequency is modified to maximize activation. In some embodiments, targeting afferent fibers, current or voltage level may be determined by finding a minimum sensory threshold for each individual or before each stimulation session. In some embodiments, targeting efferent fibers, current or voltage level may be determined by finding a muscle contraction threshold for each nerve on each individual or before each stimulation session.
In some embodiments, the neuromodulation device (e.g., the neurostimulator) is placed proximate the wrist, arm, foot, ankle, calf, thigh, and/or ear of the patient.
According to several embodiments, the neurostimulation embodiments described herein work synergistically with pharmacological agents. In light of the already sensitive and inflamed digestive system of many patients with inflammatory bowel diseases and other gastrointestinal conditions, this synergy is particularly beneficial because the patient, in one embodiment, will need an overall lower dosage of the pharmacological agent to achieve an efficacy comparable (or better) to that achieved without neurostimulation. This results in fewer undesired side effects in several embodiments.
In some embodiments, disclosed herein is a method for treating symptoms of an inflammatory gastrointestinal disease in a patient with transcutaneous stimulation of a peripheral nerve. The method can include any number of the following: positioning a first peripheral nerve effector on the patient's skin to stimulate the peripheral nerve of the patient; delivering a first electrical nerve stimulation signal transcutaneously to the peripheral nerve through the first peripheral nerve effector; receiving an input relating to activation of the first peripheral nerve; calculating one or more features from the input relating to activation at least based in part on a nerve conduction velocity of the first peripheral nerve; adjusting an electrical stimulation parameter based on one or more features of the nerve conduction velocity of the first peripheral nerve to maximize activation of a first preselected nerve fiber type, and modifying at least one brain or spinal cord autonomic feedback loop relating to release of neurotransmitters from the autonomic nervous system that modulate synthesis of inflammatory biomarkers and reduce inflammation relating to the inflammatory gastrointestinal disease.
The method can also include any number of positioning a second peripheral nerve effector on the patient's skin to stimulate a second peripheral nerve of the patient; delivering a second electrical nerve stimulation signal transcutaneously to a second peripheral nerve through the second peripheral nerve effector; adjusting an electrical stimulation parameter based on one or more features of a nerve conduction velocity of the second peripheral nerve to maximize activation of a second preselected nerve fiber type, and modifying at least one brain or spinal cord autonomic feedback loop relating to release of neurotransmitters from the autonomic nervous system that modulate synthesis of inflammatory biomarkers and reduce inflammation relating to the inflammatory gastrointestinal disease. The preselected nerve fiber type can be, for example, A-alpha, A-beta, A-delta, A-gamma, and B fibers. Adjusting the electrical stimulation parameter can include adjusting at least one of a pulse width or a pulse duration of the electrical stimulation to within about 10%, within about 5%, or about the chronaxie of the first preselected nerve fiber type. Adjusting the electrical stimulation parameter can include adjusting at least one of a pulse width or a pulse duration of the electrical stimulation to about the chronaxie of the first preselected nerve fiber type. The nerve conduction velocity could be measured orthodromically and/or antidromically.
In some embodiments, the first peripheral nerve and the second peripheral nerve do not directly innervate abdominal organs, including but not limited to the esophagus, stomach, small intestines, large intestines, liver, spleen, pancreas, and/or gallbladder. In some embodiments, the first peripheral nerve and the second peripheral nerve are not within the abdomen. In some embodiments, the first peripheral nerve and the second peripheral nerve are not a branch of the vagus nerve, or not a cervical branch of the vagus nerve.
In some embodiments, disclosed herein is a wearable device for treating symptoms of an inflammatory gastrointestinal disease in a patient with transcutaneous stimulation of one or more peripheral nerves. The device can include a controller. The device can also include a first peripheral nerve effector, including at least one, two, or more stimulation electrodes configured to be positioned on the skin to stimulate a first peripheral nerve of the patient. The device can also include a first sensor or data input source, including at least one sensing electrode configured to be positioned on the skin to measure activity of the first peripheral nerve. The controller can include a processor and a memory for receiving the feedback information from one or more sensors that, when executed by the processor, cause the device to calculate one or more features of nerve conduction velocity of the first peripheral nerve based at least in part on the feedback information of the first sensor; adjust one or more parameters of a first electrical stimulus based at least in part one or more features of nerve conduction velocity to maximize activation of a preselected fiber type in the first peripheral nerve, and/or deliver a first electrical stimulus to a first peripheral nerve through the first peripheral nerve effector to modify at least one brain or spinal cord autonomic feedback loop relating to release of neurotransmitters from the autonomic nervous system that modulate synthesis of inflammatory biomarkers and reduce inflammation relating to the inflammatory gastrointestinal disease.
In some embodiments, a device can also include a second peripheral nerve effector, including at least one stimulation electrode configured to be positioned on the skin to stimulate a second peripheral nerve of the patient; and a second sensor or data input source, including at least one sensing electrode configured to be positioned on the skin to measure activity of the second peripheral nerve. The controller can include a processor and a memory for receiving the feedback information from one or more sensors that, when executed by the processor, cause the device to: calculate one or more features of nerve conduction velocity of the second peripheral nerve based at least in part on the feedback information of the second sensor; adjust one or more parameters of a second electrical stimulus based at least in part one or more features of nerve conduction velocity to maximize activation of a preselected fiber type in the second peripheral nerve, and/or deliver a second electrical stimulus to a second peripheral nerve through the second peripheral nerve effector to modify at least one brain or spinal cord autonomic feedback loop relating to release of neurotransmitters from the autonomic nervous system that modulate synthesis of inflammatory biomarkers and reduce inflammation relating to the inflammatory gastrointestinal disease.
The preselected nerve fiber type can be, for example, A-alpha, A-beta, A-delta, A-gamma, and B fibers. The device can be configured to adjust the electrical stimulation by adjusting at least one of a pulse width or a pulse duration of the electrical stimulation to within about 10%, within about 5%, or about the chronaxie of the first preselected nerve fiber type. Adjusting the electrical stimulation parameter can include adjusting at least one of a pulse width or a pulse duration of the electrical stimulation to about the chronaxie of the first preselected nerve fiber type. The nerve conduction velocity could be measured orthodromically and/or antidromically.
In some embodiments, the device is configured such that the first peripheral nerve and the second peripheral nerve do not directly innervate abdominal organs, including but not limited to the esophagus, stomach, small intestines, large intestines, liver, spleen, pancreas, and/or gallbladder. In some embodiments, the first peripheral nerve and the second peripheral nerve are not within the abdomen. In some embodiments, the first peripheral nerve and the second peripheral nerve are not a branch of the vagus nerve, or not a cervical branch of the vagus nerve.
Several embodiments of the invention relate generally to the treatment of inflammatory bowel diseases and chronic inflammation of the digestive tract which may be due to an autoimmune response, including ulcerative colitis, Crohn's disease, microscopic colitis, and irritable bowel syndrome, and more specifically to systems and methods of treating inflammatory bowel diseases, including ulcerative colitis, Crohn's disease, and microscopic colitis through noninvasive peripheral nerve stimulation. Other non-limiting examples of indications for systems and methods as disclosed herein are also disclosed. Not to be limited by theory, some mechanism of actions including pathways that can be utilized by systems and methods as disclosed herein will now be described. Stimulation of peripheral nerves, such as, for example, vagus, median, radial, ulnar, tibial, sacral, or saphenous nerve can modulate autonomic tone. In some embodiments, there can be a synergistic effect of modulating both the parasympathetic and sympathetic nervous systems in activating the anti-inflammatory pathway. Activation of parasympathetic outflow can inhibit cytokine synthesis by release of acetylcholine, which bind to microphages in the blood stream to inhibit the release of TNF. Activation of the sympathetic outflow can increase local concentrations of adrenaline and noradrenaline, which can suppress inflammation further by inhibiting the release of TNF.
In some embodiments and not to be limited by theory, stimulation of specific peripheral nerves such as, for example, the vagus and/or tibial nerves can modulate parasympathetic tone; the saphenous nerve, among others can modulate sympathetic tone. Some nerves, such as, for example, the median, radial, or ulnar nerves can modulate sympathetic and parasympathetic tone, depending on the parameters of the electrical waveform used to stimulate the nerve.
Not to be limited by theory, stimulation of peripheral nerves can enhance maintenance of homeostasis of the autonomic nervous system. For example, a change of sympathetic outflow can trigger a subsequent change of the parasympathetic outflow to maintain homeostasis of the autonomic nervous system. Thus, acute, repeated increases in sympathetic outflow by stimulation of peripheral nerves may also increase parasympathetic outflow, which then increases release of acetylcholine and inhibition of cytokine synthesis to reduce symptoms associated with chronic inflammation. In another example, a change in parasympathetic outflow can trigger a subsequent change of sympathetic outflow. Thus, acute, repeated, increases in parasympathetic outflow by stimulation of peripheral nerves may also increase sympathetic outflow. In some embodiments, stimulation of peripheral nerves may increase or decrease sympathetic and parasympathetic activity, which increases or decreases overall autonomic tone but maintains homeostasis.
In some embodiments, sympathetic and parasympathetic activity can be measured with body-worn sensors, including but not limited to pulse or heart rate, heart rate variability, electrocardiogram (ECG or EKG), electrodermal activity or galvanic skin response, blood pressure, skin temperature, pupil dilation. Pulse, heart rate, or electrocardiogram sensors can measure changes in electrical activity when worn on the hand, wrist or chest, typically with multiple leads, or can use optical sensors as part of a photoplethysmogram system that measure changes in blood flow to calculate heart rate. Electrodermal activity or galvanic skin response, signal that reflects the action of sympathetic nerve traffic on eccrine sweat glands, measures changes in electrical properties of the skin, such as resistance, in the presence of a small electrical current or differences in the electrical potential between different parts of the skin. Blood pressure measurement devices measure changes in blood pressure during cardiac activity using an inflatable cuff, typically placed on the arm, wrist or fingers. Blood pressure can also be measured with other sensors placed on the skin, such as accelerometers or strain sensors that measure displacement of blood vessels. Skin temperature can be measured with a thermistor, thermocouple, or temperature sensor placed on the skin. Pupil dilation can be measured optically with image processing of video data, where for example, the video camera is disposed in a wearable set of eye glasses.
The vagus nerve is the longest nerve in the body and innervates numerous organs, including the organs within the gastrointestinal tract. The vagus nerve is the major neural pathway for the parasympathetic branch of the autonomic nervous system and is a mixed nerve that includes approximately 80% afferent fibers and 20% efferent fibers. The efferent fibers of the vagus nerve contribute to control of GI motility and secretion.
Afferent vagus nerve fibers synapse bilaterally on the Nucleus Tractus Solitarius (NTS) in the dorsal medulla. The NTS sends information to efferent (e.g., 30 premotor) parasympathetic nuclei located in the medulla. These efferent regions include the dorsal motor nucleus of the vagus (DMNX) and the nucleus ambiguus (NAmb), and outflow from these regions course through efferent fibers of the vagus nerve. The NTS also transfers information to the parabrachial nucleus (PBN) in the pons, which then relays signals to the visceral primary sensorimotor cortex. Moreover, the DMNX, NAmb, and NTS further communicate with a set of brain regions including the Locus coeruleus (LC, noradrenergic), rostral Ventromedial Medulla (rVMM, serotoninergic), midbrain periaqueductal gray (PAG), hypothalamus, amygdala, and dorsomedial prefrontal and anterior cingulate cortices. Thus, the NTS connects with a diffuse system of brain regions. Thus, stimulation of vagal afferents induces vagal outflow, such as though NTS/NAmb connectivity.
The auricular vagus nerve is a branch of the vagus nerve that innervates the ear in the area of the cymba concha, cavum, and/or tragus. The auricular vagus is accessible for electrical stimulation by transcutaneous or percutaneous electrodes.
Generally, the GI tract is innervated by the sacral parasympathetic fibers through the pelvic nerves originating in the S2 to S4 spinal segments, and lumbothoracic sympathetic fibers originating in the T11 to L2 segments of the spinal cord. The sympathetic fibers travel through the hypogastric nerve and inferior mesenteric ganglia, while the parasympathetic fibers travel in the pelvic nerves and plexus. Any number of the foregoing nerves, among others, can be modulated with systems and methods as disclosed herein. In some cases, effective frequency band for parasympathetic modulation can be, for example, around the frequency band of 10 to 20 Hz, while the frequency band for sympathetic modulation can be, in some cases, as high as 30 Hz or as low as 5 Hz. In a further embodiment, current level can be held constant as frequency is adjusted to maximize activation, or vice versa (frequency held constant, current level adjusted). In an additional embodiment, pulse width can be held constant as frequency is adjusted to maximize activation. In an additional further embodiment, current level and frequency can be held constant as pulse width is modified to maximize efficacy. In an additional further embodiment, current level and pulse width can be held constant as frequency is modified to maximize activation. In a further embodiment targeting afferent fibers, current or voltage level may be determined by finding a minimum sensory threshold for each individual or before each stimulation session. In a further embodiment targeting efferent fibers, current or voltage level may be determined by finding a muscle contraction threshold for each nerve on each individual or before each stimulation session.
In some embodiments, systems and methods can involve stimulation parameters including frequency and spatial selectivity on the surface of the distal limb to selectively modulate and balance the sympathetic and parasympathetic system.
Not to be limited by theory, stimulation of a first target nerve, such as the saphenous nerve can provide sympathetic modulation of the anti-inflammatory pathway. Specifically, electrical stimulation tuned to excite large myelinated fibers in a target nerve, e.g., the saphenous nerve can provide somatic afferent input to the lumbar plexus, mediating the sympathetic input to the GI tract via the hypogastric nerve. Sympathetic nerves increase local concentrations of adrenaline and noradrenaline, which can suppress inflammation in the GI tract by inhibiting the release of TNF. Stimulation of a second target nerve, e.g., the tibial nerve can provide parasympathetic modulation of the anti-inflammatory pathway. Specifically, electrical stimulation tuned to excite large myelinated fibers in the tibial nerve provides somatic afferent input to sacral plexus, mediating parasympathetic input to the GI tract via the pelvic nerves via release of cholinergic transmitters that bind to microphages in the blood stream to inhibit the release of TNF.
In general, stimulation of superficial and/or cutaneous afferent and/or efferent nerves can prevent an inflammatory response by inhibiting the nucleus of the solitary tract and vagal nuclei. Stimulation of deep afferent and/or efferent nerves can prevent an inflammatory response by exciting the arcuate nucleus-ventral periaqueductal gray-nuclei raphe pathway, inhibiting the rostral ventrolateral medulla (rVLM) and thereby the sympathetic outflow. Superficial fibers are finer (e.g., smaller diameter) afferents that relay sensory information to the superficial dorsal horn, which is a distinct region of the dorsal horn and spinal gray matter; deep fibers are thicker (e.g., larger diameter) afferents that relay sensory information to the deep dorsal horn.
Transcutaneous stimulation of one, two, or more target nerves of interest, e.g., the saphenous, tibial, median and/or vagus nerve stimulation can be effective. However, in some embodiments, transcutaneous stimulation can be preferred. The feasibility of home-based stimulation has been limited by device form factor and limited programming flexibility of current devices.
In some embodiments, more continuous stimulation at can potentially improve the efficacy of peripheral nerve stimulation for conditions such as, for example, inflammatory bowel disease. An implanted, transcutaneous, and/or percutaneous nerve stimulator can be efficacious and safe. Some embodiments can use frequencies of, for example, between about 1 kHz and about 100 kHz, 1 Hz and about 100 Hz, between about 1 Hz and about 50 Hz, between about 5 Hz and about 30 Hz, or between about 10 Hz and about 20 Hz stimulation for a specified period of time, such as about, at least about, or no more than about 20, 30, 40, 50 or 60, 90, 120, or 240 minutes at a sensory or sub-sensory threshold or below motor contraction threshold that is tolerable to the patient. Varying the regularity of stimulation and the frequency of the stimulation waveform may improve tolerance or efficacy in some cases. An increased frequency of stimulation may be more effective but could require a more chronic at-home portable system to provide continuous transcutaneous stimulation throughout the day. In some embodiments, stimulation of a target nerve can utilize a frequency of between about 5 Hz and about 200 Hz, between about 2 Hz and about 150 Hz, or about 2 Hz, 5 Hz, 10 Hz, 20 Hz, 30 Hz, 40 Hz, 50 Hz, 60 Hz, 70 Hz, 80 Hz, 90 Hz, 100 Hz, 110 Hz, 120 Hz, 130 Hz, 140 Hz, 150 Hz, 160 Hz, 170 Hz, 180 Hz, 190 Hz, 200 Hz, or ranges including any two of the foregoing values. In some embodiments, the target nerve is the tibial nerve or the saphenous nerve. In some embodiments, the target nerve is the median nerve or the ABVN.
Stimulating at intensities below the sensory threshold or with high frequencies (e.g., between about 1 kHz to about 100 kHz) can avoid the discomfort (tingling, numbness, pain) that can be associated with peripheral nerve stimulation. Because the exact electrode position, size and surface contact can have a large effect on the stimulation level and the anatomical structures that receive the stimulation, the sensory threshold may need to be calibrated for each patient and even for each session. This calibration may be done by the user manually setting the stimulation parameters or otherwise indicating their sensory threshold. Another possible embodiment is for the device to automatically sweep through a range of stimulation parameters and the patient chooses the most comfortable set of parameter values. Another possible embodiment is for the patient to choose from among a set of previously chosen parameter values that provided effective and comfortable stimulation.
The stimulation waveforms described herein can be applied continuously to target nerves, or can be provided in a manner that is adaptive in applying stimulation of various durations or by adjusting properties of the stimulation waveform to maximize efficacy, including but not limited to current or voltage amplitude, frequency, and pulse width, in response to different inputs in the system. In some embodiments, the system could include closed loop control, using one or more signals measured by the device or feedback input into the device by the patient or physician to modulate the stimulation to improve efficacy. The signals or input could include, for example, any number of the following: sensors on-board the device or sensor in other devices with data stored in a remote server via wireless communicates (e.g., data stored in a cloud server via cellular connection) or sensors in other devices in direct communication with the stimulator, either wired or wirelessly; evaluation of autonomic function, reflex loop integrity, or excitability using heart rate variability, galvanic skin response, or pupil dilation, measuring muscle sympathetic nerve activity (MSNA), and/or measuring h-reflex by sending a stimulation signal and measure response with EMG. In some embodiments, the signals or input can also include sleep sensor sets, including but not limited to accelerometers, gyroscopes, infrared based motion sensors, and/or pressure sensors under a mattress, to measure night time motion as a measure of night time bowel events. For example, patients may wear a stimulator while sleeping and therapy can be triggered by night time restlessness, which is an indicator of an upcoming event. An EEG headband could be used to measure different sleep states. Patient and/or physician input can provide feedback on the effectiveness of and/or satisfaction with the therapy into the device or into another connected device. Also, usage of the stimulation device can be tracked; and specific stimulation programs (e.g., a specified set of stimulation parameters) can be changed based on symptoms presented by the patient or outcomes of the therapy. In a further embodiment, current level can be held constant as frequency is adjusted to maximize efficacy. In an additional embodiment, pulse width can be held constant as frequency is adjusted to maximize efficacy, or vice versa (pulse width adjusted, frequency held constant). In an additional further embodiment, current level and pulse width can be held constant as frequency is modified to maximize efficacy. In an additional further embodiment, current level and frequency can be held constant as pulse width is modified to maximize efficacy.
In some embodiments, a stimulator can be part of a system with sensors to assess the state of sleep and modulate stimulation based on the wearer's sleep state. Sensors could include motion sensors (e.g., body worn accelerometers and gyroscopes, or wireless motion tracking via video or infrared), temperature sensors to measure body temperature, pressure sensor under the mattress to measure movement, heart rate sensors to measure HRV, other sensors to measure sympathetic and parasympathetic activity, and/or EEG sensors to measure brain activity to assess the wearer's sleep state. For example, if night time events occur during slow wave sleep when parasympathetic activity can be elevated, stimulation parameters are modulated to affect parasympathetic activity, and vice-versa for sympathetic activity.
In some embodiments, a first stimulation frequency can be provided for short term benefit, and a second stimulation frequency different (e.g., higher or lower) from the first stimulation frequency can be provided for long-term benefit. For example, 10 Hz stimulation can provide a short term benefit and 20 Hz stimulation can provide a long term benefit in some cases. As one example, 10 Hz stimulation can be provided in an initial period with the therapy (e.g., 3 weeks) for acute therapy, then 20 Hz stimulation can be provided for long term maintenance or condition therapy, or vice versa depending on the desired clinical result. In some embodiments, particular sympathetic and/or parasympathetic nervous system targets and circuits can be specifically targeted to modulate upward or downward sympathetic and/or parasympathetic nervous system activity depending on the patient's underlying autonomic nervous system activity. Utilization of data and/or sensors directly or indirectly measuring sympathetic and/or parasympathetic nervous system activity as disclosed, for example, elsewhere herein can be utilized as closed loop feedback inputs into a hardware and/or software controller to modify stimulation parameters, including on a near real-time basis.
In some embodiments, the therapy (e.g., stimulation) can be applied for about, at least about, or no more than about 5 minutes, 10 minutes, 15 minutes, 30 minutes, 45 minutes, 1 hour, 2 hours, 3 hours, 4 hours, 5 hours, 6 hours, or more a day. In some embodiments, the patient is treated nocturnally, such as during sleep, and/or during waking hours. The treatment can be repeated 1, 2, 3, 4, 5, or more times daily or weekly, every other day, every third day, weekly, or other interval depending on the desired clinical result.
In some embodiments, the responsiveness could be dependent on different times of day. In some embodiments, stimulation schemes are applied to restore autonomic dysregulation based on natural diurnal patterns of sympathetic or parasympathetic activity. Treatment could also occur at irregular intervals that are human-entered or predicted by machine learning from previous days' voiding incidents. In some embodiments, a first frequency (e.g., 10 Hz or 20 Hz) therapy can be applied in the morning for acute day time relief, and a second different higher or lower frequency (e.g., 20 Hz or 10 Hz) therapy can be provided before bed for longer night time relief.
In some embodiments, specific fiber types within a nerve or nerves can be selectively activated (e.g., create action potentials in such specific fiber types) to restore autonomic balance by specifically modulating sympathetic and parasympathetic limbs of the autonomic nervous system (e.g., selectively only one, or more than one of A-alpha, A-beta, A-delta, B, and/or C fibers; afferent fibers or efferent fibers, sympathetic or parasympathetic). In some embodiments, systems and methods do not stimulate or substantially stimulate A-alpha, A-beta, A-delta, B fibers, or C fibers.
Some embodiments can include preferential stimulation of cutaneous fibers (e.g., A-alpha, A-beta, A-delta, and/or C; afferent or efferent, sympathetic or parasympathetic) fibers to inhibit sympathetic activity of via the stellate ganglion. Stimulation of select cutaneous fibers at the wrist can carry sensory information by way of the medial cutaneous nerve and the medial cord of the brachial plexus, which innervates the spinal cord at the level of C8-T1; stimulation in turn modulates sympathetic activity by way of the stellate or cervicothoracic ganglion, which are a collection of sympathetic nerves at the level of C7-T1.
Some embodiments can include preferential stimulation of efferent or afferent fibers of vagus nerve or other peripheral nerves to modulate systemic inflammation via the cholinergic parasympathetic system. For example, efferent stimulation of the vagus nerve may facilitate lymphocyte release from thymus through a nicotinic acetylcholine receptor response, and nicotine administration can be effective for treating some cases of inflammatory bowel disease. In some embodiments, afferent or efferent nerves may be preferentially stimulated by delivering stimulation at a level above or below the motor threshold (e.g., threshold of electrical potential required to active a nerve).
Not to be limited by theory, peripheral nerve fibers are classified based on the diameter, nerve conduction velocity, and the amount of myelination on the axons. These classifications apply to afferent and efferent fibers. Fibers of the A group have a large diameter, high conduction velocity, and are myelinated. The A group is further subdivided into four types: A-alpha (primary receptors of the muscle spindle and golgi tendon organ), A-beta (secondary receptors of the muscle spindle and cutaneous mechanoreceptors), A-delta (free nerve endings that conduct sensory stimuli related to pressure and temperature), and A-gamma (typically efferent neurons that control the activation of the muscle spindle) fibers. Fibers of the B group are myelinated with a small diameter and have a low conduction velocity. The primary role of B fibers is to transmit autonomic information. Fibers of the C group are unmyelinated, have a small diameter, and low conduction velocity. The lack of myelination in the C group is the primary cause of their slow conduction velocity. Additionally, for example, the vagus nerve consists of between 80-90% afferent fibers.
Some embodiments can include preferential stimulation of sympathetic or parasympathetic fibers of vagus nerve or parasympathetic nerves or fibers, sympathetic nerves or fibers, and/or other peripheral nerves to modulate systemic inflammation via the cholinergic parasympathetic system or sympathetically-driven release of adrenaline and noradrenaline, respectively. Preferential stimulation can be enabled by stimulating nerves within specific ranges of one or more electrical waveform parameters, including but not limited to current or voltage level, pulse width, stimulation frequency, inter-pulse spacing, waveform shape, and/or bursting frequency. In some embodiments, afferent fibers of a mixed peripheral nerve can be preferentially stimulated by adjusting the stimulation current or voltage to a level that does not induce muscle contraction, and thus is activating little to no efferent fibers. In another embodiment, larger diameter fibers at the same level of depth as other nerve fibers may be preferentially stimulated by adjusting voltage or current levels that are high enough to activate A-fibers, but not B- or C-fibers; or activate A- and B-fibers, but not C-fibers; or activate A-alpha and A-beta fibers, and A-delta fibers but not A-gamma, B-, or C-fibers.
Not to be limited by theory, chronaxie (chronaxy) is the minimum time required for an electric current, double the strength of the rheobase, to stimulate a nerve. Rheobase is the lowest current or voltage level, assuming an indefinite pulse width, required to stimulate a nerve or neuron. Chronaxie is dependent on the density of voltage-gated sodium channels in the cell, which affect that cell's excitability. Chronaxie varies across different nerves, neurons, and nerve fiber types. Stimulation pulse width (or pulse duration, depending on the shape of the waveform) can be modified to maximize activation of targeted neurons, nerves or nerve fibers based on the average chronaxie of the targeted nerve, neuron, or nerve fiber. In some embodiments, electrical pulses with the pulse width or pulse duration equal or nearly equal to the chronaxie are most effective (at relatively low amplitudes) to elicit action potentials. For example, Act fibers can be activated at short pulse durations, such as about 0.1 ms, at relatively low current amplitudes while avoiding the stimulation of C-type pain fibers (
In another embodiment, afferent or efferent fibers can be preferentially stimulated by adjusting pulse width. For example, not to be limited by theory, shorter pulse widths (e.g., less than 200 μs) can preferentially activate efferent fibers, and longer pulse widths (e.g., greater than 500 μs) can preferentially activate afferent fibers. In some embodiments, the pulse width could be between about 50 μs and about 400 μs, such as about 50 μs, 100 μs, 150 μs, 200 μs, 250 μs, 300 μs, 350 μs, 400 μs, 450 μs, 500 μs, or ranges including any two of the foregoing values.
In a further embodiment, current level can be held constant as pulse width is modified to maximize activation. In an additional embodiment, frequency can be held constant as pulse width is modified to maximize activation. In an additional further embodiment, current level and frequency can be held constant as pulse width is modified to maximize activation. In a further embodiment targeting afferent fibers, current or voltage level may be determined by finding a minimum sensory threshold for each individual or before each stimulation session. In a further embodiment targeting efferent fibers, current or voltage level may be determined by finding a muscle contraction threshold. In a further embodiment of the system, one or more additional sensing electrodes can be placed along the pathway of the target nerve being stimulated that measure conduction velocity of the stimulated nerve to assess engagement of specific fiber types; pulse width can be modified to maximize activation of a specific fiber type corresponding to the measured conduction velocity.
In some embodiments, an electrical stimulation and sensing device can comprise a stimulation pulse generator configured to deliver an electrical stimulation to a patient, the electrical stimulation comprising a stimulation pulse delivered to a peripheral nerve of the patient via a first peripheral nerve effector placed on the patient's skin adjacent to the peripheral nerve. The first electrical stimulation pulse can be delivered to activate the peripheral nerve and evoke an action potential. The device can further comprise a sensor configured to measure the action potential evoked in the peripheral nerve by the first electrical stimulation pulse via a second peripheral nerve effector placed on the patient's skin, and a processor configured to adjust one or more parameters of the electrical stimulation, including but not limited to current or voltage intensity, pulse width (or pulse duration), and frequency, based on a predetermined feature of the sensed action potential, including but not limited to nerve conduction velocity. In some embodiments, the sensing peripheral nerve effector can be placed orthodromically or antidromically with respect to the stimulation adjacent to the stimulated peripheral nerve. In an additional embodiment, the system can have a single sensing effector placed in a location that can measure nerve activity of the first stimulated peripheral nerve and the second stimulated peripheral nerves, only when the two nerves are not stimulated simultaneously. For example, a single sensing effector could be place adjacent to the brachial plexus to measure stimulated nerve activity of both the radian and medial nerves, only when they are not stimulated simultaneously.
In a further embodiment, an electrical stimulation and sensing device can comprise a stimulation pulse generator configured to deliver an electrical stimulation to a patient. The electrical stimulation can comprise a first stimulation pulse delivered to a first peripheral nerve of the patient via a first peripheral nerve effector placed on the patient's skin adjacent to the first peripheral nerve and a second stimulation pulse delivered to a second peripheral nerve of the patient via a second peripheral nerve effector placed on the patient's skin adjacent to the second peripheral nerve. The first electrical stimulation pulse can be delivered to activate the first peripheral nerve and evoke a first action potential and the second electrical stimulation pulse can be delivered to activate the second peripheral nerve and evoke a second action potential. The device can further comprise a first sensor configured to measure the first action potential evoked in the first peripheral nerve by the first electrical stimulation pulse via a third peripheral nerve effector placed on the patient's skin, and a second sensor configured to measure the second action potential evoked in the second peripheral nerve by the second electrical stimulation pulse via a fourth peripheral nerve effector placed on the patient's skin, and a processor configured to adjust one or more parameters of the electrical stimulation, including but not limited to current or voltage intensity, pulse width (or pulse duration), and frequency, based on a predetermined feature of the sensed action potential. In some embodiments, the sensing peripheral nerve effectors can be placed adjacent to the stimulated peripheral nerve either orthodromically or antidromically with respect to the stimulating peripheral nerve effector.
In some embodiments, the device further comprises an additional set of sensors configured to measure action potentials of the stimulated nerve both orthodromically and antidromically with respect to the stimulating peripheral nerve effector(s).
In a further embodiment, the device includes a processor configured to adjust one or more parameters of the electrical stimulation based on one or more predominant features of nerve conduction velocity derived from the sensed action potential. The derived features can be associated with a preferential activation of specific fiber type(s).
In another embodiment, afferent or efferent fibers can be preferentially stimulated by adjusting pulse width. For example, not to be limited by theory, shorter pulse widths (e.g., less than 200 μs) can preferentially activate efferent fibers, and longer pulse widths (e.g., greater than 500 μs) can preferentially activate afferent fibers. In a further embodiment, current level can be held constant as pulse width is modified to maximize activation. In an additional embodiment, frequency can be held constant as pulse width is modified to maximize activation. In an additional further embodiment, current level and frequency can be held constant as pulse width is modified to maximize activation. In a further embodiment targeting afferent fibers, current or voltage level may be determined by finding a minimum sensory threshold for each individual or before each stimulation session. In a further embodiment targeting efferent fibers, current or voltage level may be determined by finding a muscle contraction threshold. In a further embodiment of the system, one or more additional sensing electrodes can be placed along the pathway of the target nerve being stimulated that measure conduction velocity of the stimulated nerve to assess engagement of specific fiber types; pulse width can be modified to maximize activation of a specific fiber type corresponding to the measured conduction velocity.
In some embodiments, peripheral nerve effectors can be positioned on the patient's skin such as on the medial side of the forearm as to stimulate the median cutaneous nerve but not stimulate or not substantially stimulate the median, radial, or ulnar nerves, or at least stimulate the medial cutaneous nerve preferentially. In some embodiments, the lateral cutaneous nerve and/or musculocutaneous nerve, or specific fibers thereof can be preferentially or specifically stimulated. In some embodiments, only a single type of nerve fiber is activated, while other types are not activated.
Selective activation of various nerve fiber types can be accomplished in various ways. In some embodiments, stimulation parameters such as pulse width of a biphasic square wave (shown schematically in
In some embodiments, a device can include electrodes configured to selectively stimulate superficial nerve fibers (e.g., fibers closer to the surface of the skin) by aligning the electrodes along the length of the nerve axon.
In some embodiments, stimulation systems and methods can be configured to increase blood flow at a target region (e.g., in the gut) to improve clearance of inflammatory biomarkers (e.g., cytokines).
In some embodiments, noninvasive neuromodulation for autonomic regulation for IBD and other diseases can be performed.
Autonomic nervous system imbalance with a dominant activation of the sympathetic nervous system and inadequate parasympathetic tone may have a key role in the pathogenesis of various immune related disorders including IBD. In some embodiments, increased local blood flow can improve cytokine (or other inflammatory marker) clearance from the GI tract. Anatomical studies have shown large amounts of sympathetic adrenergic/noradrenergic fibers innervate both into the dome region of the follicles where fibers are in direct contact with lymphoid cells and in the lamina propria where fibers are mainly associated with blood vessels. Non-invasive nerve stimulation can regulate blood flow changes and inflammatory marker clearance. In some embodiments, tibial stimulation can tap into the enteric nervous system via the pelvic nerve, modulating transmucosal fluid fluxes, local blood flow and other functions.
In some embodiments, systems and methods as disclosed herein can increase blood flow to a target region of the anatomy by at least about, about, or no more than about 5%, 10%, 15%, 20%, 25%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100%, or more, or ranges including any of the aforementioned values.
The enteric nervous system (ENS) is a major division of the autonomic nervous system with a mesh-like system of nerves that regulates the gastrointestinal (GI) tract, which includes the splanchnic organs like stomach, small intestines, and large intestines. Splanchnic circulation, or circulation of the GI tract, is composed of gastric, small intestinal, colonic, pancreatic, hepatic, and splenic circulations, arranged in parallel with one another. The three major arteries that supply the splanchnic organs, celiac and superior and inferior mesenteric, give rise to smaller arteries that anastomose extensively. The circulation of some splanchnic organs is complicated by the existence of an intramural circulation, and redistribution of total blood flow between intramural vascular circuits may be as important as total blood flow. Numerous factors influence the splanchnic circulation, including external factors such as activity of the autonomic nervous system, the state of the cardiovascular system, and concentrations of neurohormones circulating in the blood.
Blood flow rate in vessels is governed primarily by the arterial-to-venous pressure gradient and the mechanical resistance to the flow of blood along the vessel. Small changes in the vascular smooth muscle tone can alter the diameter of the vessel. The vascular resistance is inversely related to the fourth power of the radius of the vessel, thus a small change in internal diameter will produce a large change in resistance and blood flow. For example, a small decrease in diameter of a blood vessel would produce a large increase in resistance and thus a large decrease in blood flow, and vice-versa. Blood vessels that provide the greatest changes in resistance to blood flow, like small arteries and arterioles, are densely innervated by the sympathetic nervous system.
The splanchnic organs are innervated by the autonomic nervous system, including the sympathetic and parasympathetic limbs. Activation of parasympathetic fibers modulate secretion and motility that lead to metabolic and mechanical changes that affect blood flow. Postganglionic sympathetic fibers innervate and act directly on the vascular smooth muscle, and activation leads to changes in vessel diameter, tone, and thus blood flow. Generally, stimulation of the sympathetic fibers increases vascular tone and decreases blood flow to the splanchnic organs. Acute sympathetic stimulation contract venous smooth muscle and expels a large volume of pooled blood from the splanchnic venous system and into systemic circulation. Sustained sympathetic stimulation or activity leads to a decrease in blood flow mainly in the superior mesenteric and hepatic arteries. Additionally, sympathetic stimulation causes the release of neurohormones like epinephrine and norepinephrine that also alter vascular resistance and decrease blood flow.
Insufficient blood flow within the enteric system can also lead to the further release of inflammatory cytokines, including interleukin 1, tumor necrosis factor, interleukin 6, and interleukin 8, and others. Thus, mechanisms that increase splanchnic circulation can improve symptoms associated with immune related disorders, including inflammatory bowel diseases, by reducing the release of inflammatory cytokines or other markers and/or by increasing the clearance of inflammatory cytokines or other markers in circulation via the liver, spleen, and/or kidneys.
Not to be limited by theory, stimulation of a first target nerve, such as the saphenous nerve can provide sympathetic modulation to reduce sympathetic tone and increase blood flow. Specifically, electrical stimulation tuned to excite large myelinated fibers in a target nerve, e.g., the saphenous nerve can provide somatic afferent input to the lumbar plexus, mediating the sympathetic input to the GI tract via the hypogastric nerve. Stimulation of a second target nerve, e.g., the tibial nerve can provide parasympathetic modulation of the enteric nervous system. Specifically, electrical stimulation tuned to excite large myelinated fibers in the tibial nerve provides somatic afferent input to sacral plexus, mediating parasympathetic input to the GI tract via the pelvic nerves to modulate secretion and motility that lead to metabolic and mechanical changes that increase blood flow.
In another embodiment, stimulation of a first target nerve, such as the auricular vagus nerve, can provide modulation of vagal tone and reduction of sympathetic activity to increase blood vessel dilation, modulate secretion and motility, and thus increase blood flow.
In another embodiment, stimulation of a first target nerve, such as the sacral parasympathetic fibers of the pelvic nerves, originating in the S2 to S4 spinal segments, can be stimulated directly by electrodes placed over the sacral region. Electrodes can be transcutaneous, percutaneous, and/or implanted. Stimulation of a second target nerve, such as the lumbothoracic sympathetic fibers originating in the T11 to L2 segments of the spinal cord, can be stimulated directly by electrodes placed over the lumbar region.
In some embodiments, systems and methods can include monitoring skin turgor and/or electrodermal activity as a marker of inflammation and hydration status using, for example, a galvanic coupling method.
The etiology and pathogenesis of inflammatory bowel disease (IBD) has not yet been elucidated, yet many environmental factors are suspected to contribute to the development of IBD, including diet and hydration levels. Studies have shown negative correlations between total fluid consumption in a person's diet and the risk for developing IBD. Thus, preventing dehydration in people with or at risk of developing IBD can be important for preventing or alleviating symptoms by reducing the expression of inflammatory markers, such as cytokines.
Some embodiments can involve a closed-loop approach to treating IBD and other diseases that involves using a galvanic coupling method to identify changes in hydration status with immediate or near real-time feedback to the subject to encourage hydration while also administering therapy via electrical stimulation.
The system may target other nerves or dermatomes that modulate the parasympathetic and/or sympathetic nervous system, including but not limited to, the median nerve, ulnar, or radial nerve in the wrist, the lumbothoracic region, the sacral region, the stomach, and/or the foot including the bottom of the foot.
Dehydration can be assessed by various methods, including but not limited to a skin turgor assessment, which evaluates the level of skin elasticity, and galvanic skin response, which measures skin impedance by passing small amount of current between two electrodes. Some embodiments describe a system that incorporates a wearable sensor to measure body hydration levels, store this data over time, provide feedback to the wearer and/or adjust stimulation parameters to improve therapeutic benefit of the stimulation.
In one embodiment, the wearable system includes a sensor for detecting galvanic skin response, memory for storing data from the sensor, a computational unit for assessing sensor data, a feedback device, such as a display or haptic motor to display sensor output or trigger the wearer, and/or controller unit to control output of stimulation. The galvanic skin response sensor can be embedded in a device that is placed transcutaneously on the surface of the skin in locations including, but not limited to, the wrist, arm, leg, chest, or abdomen. The sensor may be disposed in an adhesive patch placed anywhere on the body, or disposed in an enclosure that houses all parts of the system. In some embodiments, the sensor may be a separate device from the stimulation and is in wireless or wired communication with the stimulator. In some embodiments, the sensor data is transmitted to an external computational device or transmitted wirelessly to a database (e.g., the cloud) for further processing.
In one embodiment, the wearable system includes a sensor for detecting skin elasticity. Skin elasticity can be measured mechanically by stretching the skin and measuring the resistive force during stretching. A device may house effector end points connected to electric motors that stretch the skin in a linear or rotational motion and measure the resistive force due to the stretching. The ratio of the amount of skin stretch to resistive force can be calculated to assess skin elasticity.
In another embodiment, the sensor for detecting skin elasticity can be an adhesive patch with strain sensors that measure strain due to skin stretch during normal or directed motions. Strain sensors measure strain of an object by measuring the change in electrical resistivity of the sensor as it is deformed, and strain is a measure of deformation representing the displacement between particles in the body relative to a reference length. Strain measurements can be stored over time to assess the state of skin elasticity and correlate the measure to the wearer's level of dehydration.
In some embodiments, not to be limited by theory, alternating bursting stimulation on two or more different nerves, e.g., the medial, radial, and/or ulnar nerves can prevent or reduce an inflammatory response by having a synergistic effect that increases input to stellate ganglion via the brachial plexus to inhibit sympathetic activity or modulate vagal tone via the carotid sinus nerve.
In some embodiments, a system can include a plurality of stimulators that communicate with each other wirelessly and provided a synchronized continuous or patterned stimulation, and/or synchronize the timing of different stimulations. In some embodiments, multiple stimulators may be in electrical connection with multiple electrode pairs to stimulate multiple nerves simultaneously. Each stimulator in the system can communicate with each other via a wired or wireless connection. Multiple stimulators can provide synchronized stimulation to the multiple nerves. Stimulation may be, for example, burst, offset, or alternating between the multiple nerves. In some embodiments, a stimulation system with a plurality of stimulator housings that can include or be operably connected to a patch having electrodes and a skin-contacting surface. Each individual stimulator can be placed, for example, transcutaneously just below the knee and/or just above the ankle as illustrated. The stimulators can be placed sufficient to stimulate the saphenous and/or tibial nerves. The stimulators can be placed in some cases between the knee and the ankle, such as in the proximal calf (such as within the most 25% proximal section of the calf, or between the 25% and 50% most proximal section of the calf), distal calf (such as the most 25% distal section of the calf or between the 25% and 50% most distal section of the calf), or combinations thereof. The stimulators can be physically discrete for each other, or combined into a single housing such as a calf band or other form factor as described elsewhere herein.
In some embodiments, the electrodes, constructed from an adhesive hydrogel, are disposed in the housing of the device allowing the device to adhere to the wearer's skin. In other embodiment, the electrodes are dry or non-adhesive and are disposed in the device with a strap to securely connect to electrodes to a limb, such as on the wrist or ankle. In some embodiments, a system can include a plurality of stimulators that communicate with each other wirelessly and provided a synchronized continuous or patterned stimulation. In some embodiments, multiple stimulators may be in electrical connection with multiple electrode pairs to stimulate multiple nerves simultaneously. Each stimulator in the system can communicate with each other via a wired or wireless connection. Multiple stimulators can provide synchronized stimulation to the multiple nerves. Stimulation may be, for example, burst, offset, or alternating between the multiple nerves.
In some embodiments, dry electrodes can be utilized, such as dry electrodes that include a conductive backing layer (e.g., a metal foil material, such as disposed on a flexible polymer substrate) and a skin contact layer disposed on the conductive backing layer, that can include for example a polymer, plastic, or rubber material, and a conductive filler material (e.g., powder, fine particulate material, metal, carbon, mixtures thereof, or porous material treated with a conductive coating) dispersed substantially evenly throughout the silicone, plastic, or rubber material. In some embodiments, the skin contact layer has a skin facing surface that is not coated with a hydrogel or liquid. In some embodiments, the dry electrodes can be as disclosed in PCT App. No. PCT/US2017/040920, filed on Jul. 6, 2017, hereby incorporated by reference in its entirety.
In some embodiments if the electrodes are sticky, as shown in the embodiment of
In some embodiments, median, radial, and/or ulnar stimulation can be combined for a synergistic effect at the brachial plexus. The median, radial, and ulnar nerves innervate different levels of the spinal cord at the brachial plexus, with pathways that proceed to different target locations and organs. Some embodiments can provide timed stimulation, either simultaneously or with a delay, to the median, radial, and/or ulnar nerves to control targeting within the brachial plexus to provide a synergistic effect of neural activation at the brachial plexus, which leads to the stellate ganglia and the sympathetic chain. This synergistic effect can provide an advantage of greater therapeutic benefit with less discomfort and less current (e.g., less power for longer battery life). Timing of the stimulation may be simultaneous, or with a delay to account for differences in conduction velocities for the different nerves such that the signals reach the brachial plexus at the same time. Not to be limited by theory, but simultaneous or near simultaneous activation of the brachial plexus can enhance stimulation through the pathway to the stellate ganglia, and increase the effect (e.g., inhibition) of the sympathetic nervous system. For example, the average conduction velocities of sensory nerves of radial, median, and ulnar nerves are about 51 m/s, 60 m/s, and 63 m/s respectively. Based on variation in nerve length from the wrist to the brachial plexus from 1st percentile female to 99th percentile male, this would require a delay in stimulation between the median and radial nerves of about 1.3 to about 1.7 milliseconds, between median and ulnar of about 0.3 and about 0.4 ms, and between radial and ulnar of about 1.6 ms and about 2.1 ms. In some embodiments the delay in stimulation between a first nerve and a second nerve can be between about 0.3 ms and about 1.7 ms, or between about 0.2 ms and about 2.0 ms, between about 1.2 ms and about 2.1 ms, or between about 1 ms and about 2 ms. Lower threshold stimulation on the median, radial, and/or ulnar nerves in combination can advantageously require lower threshold stimulation on the individual nerves with a resultant synergistic effect at the brachial plexus. In some embodiments, a system could include a nerve conduction velocity measurement by applying a stimulation source on a distal portion of the nerve(s) and a measurement electrode on a proximal portion of the nerve(s) to measure an individual's nerve conduction velocities and modify the timed delay based on the individualized measurements.
In some embodiments, a system could include an electrode configuration to stimulate nerves (e.g., radial, median, and/or ulnar) in an alternating pattern that could be rhythmic or pseudorandom. For rhythmic alternating patterns, the alternating frequency can be in a range from 1-100 Hz, which has been shown improve efficiency of therapy by promoting plasticity of corticospinal circuits. In some embodiments, a device embodiment could include an electrode configuration to alternate stimulation of nerves (e.g., radial, median, and/or ulnar) and adjust stimulation parameters (e.g., stimulation frequency, alternating frequency, duration of stimulation, stimulation time of day) based on an assessment of autonomic balance, for example, by measuring heart rate variability (HRV) and analyzing sympathovagal balance as a the ratio of absolute low frequency (LF) to absolute high frequency (HF) power, or LF/HF of measured HRV as noted elsewhere herein.
Sympathetic and parasympathetic activity can be measured through several methods, including microneurography (MSNA), catecholamine tests, heart rate, HRV, or galvanic skin response. HRV can provide a quick and effective approximation of autonomic activity in the body. HRV can be determined by analyzing the time intervals between heartbeats, also known as RR intervals. Heart rate can be accurately captured, for example, through recording devices such as chest straps or finger sensors. The differences between successive RR intervals can provide a picture of one's heart health and autonomic activity. Generally speaking, healthier hearts have more variability between successive RR intervals. This interbeat data can also be used to denote an individual's sympathetic and parasympathetic activity levels. Through frequency-domain analysis, heartbeat frequencies can be separated into distinct bands. High-frequency signals (˜0.15-0.4 Hz) can almost exclusively reflect parasympathetic activity, and low-frequency signals (˜0.04-0.15 Hz) can represent a mixture of sympathetic and parasympathetic activity. Therefore, taking the ratio of high frequency (HF) to low frequency (LF) signals can yield an approximation of one's sympathetic tone. In some embodiments, HRV can be analyzed, for example, under time domain, geometric domain methods in addition to frequency domain methods. In some embodiments, increased heart rate variability can signify increased parasympathetic response and/or decreased sympathetic response. Decreased heart rate variability can signify decreased parasympathetic response and/or increased sympathetic response. In some embodiments, a system can sense an increase or decrease in HRV of about or more than about 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 75%, 100%, or more over a baseline value (or target desired HRV value) and institute a change in one, two, or more stimulation modality parameters accordingly. In some embodiments, the one, two, or more stimulation modalities can be configured to modulate, such as increase or decrease stimulation to one or more nerves (e.g., peripheral nerves) associated with the sympathetic and/or parasympathetic nervous system, and a response to therapy can be confirmed by sensing an increase or decrease in parasympathetic or sympathetic tone, including but not limited to increase or decrease in HRV, changes in high frequency content of HRV, and changes in the ratio of high frequency and low frequency content of HRV. In some embodiments, balance of parasympathetic and sympathetic activity of the inflammatory response reflex loop can be assessed with frequency analysis of heart rate variability measured with pulsed plethysmography with an LED light source and optical sensor disposed in the device that measures fluctuations in light level due to blood flow that target one of the major blood vessels around the knee, which could include one or more of the following, femoral, popliteal, tibial, posterior tibial, anterior tibial, and/or descending genicular arteries or veins, or vessels around the wrist, or in the arm or neck or ear in other embodiments. In some embodiments, heart rate could be measured using accelerometer-based sensors or with electrical-based sensors, similar to single or multiple-lead ECG monitors.
A large source of error in optical measurements of heart rate is motion artifacts due to relative motion between the optical sensor and the blood vessel being measured. In some embodiments, the optical heart rate sensor has an adhesive on the side of housing that contacts the wearer's skin to reduce relative motion between the sensor and the target blood vessel. In some embodiments, one, two, or more additional sensors are disposed in the device, including electrical sensors in contact with the wearer's skin to measure cardiac activity or pressure sensors to measure changes in blood vessels, to be used in combination with an optical sensor to improve the fidelity of heart rate measurement. In some embodiments, the system and device have memory and a processor to extract RR intervals from sensor data, calculate variability of RR intervals, transform data into frequency domain, and calculate high frequency signals, low frequency signals, and the ration of the high frequency and low frequency signals. In some embodiments, the heart rate sensor can store collected data for specified time periods to gather adequate data for heart rate variability calculation. Specified time period can range in some cases from 1-60 seconds, and may extend to 10 minutes or more.
In some embodiments, electrodermal activity, also known as galvanic skin response or skin conductance response, for example, can be measured using sensors, such as electrodes. Galvanic skin response is the change of the electrical resistance of the skin caused by emotional stress, and measurable with, e.g., a sensitive galvanometer. Not to be limited by theory, skin resistance varies with the state of sweat glands in the skin. Sweating is controlled by the sympathetic nervous system, and skin conductance can be an indication of psychological or physiological arousal. If the sympathetic nervous system is highly aroused, then sweat gland activity also increases, which in turn increases skin conductance. In this way, skin conductance can be a measure of emotional and sympathetic responses, which can be measured, and the feedback data can be sent to the controller, which will in turn modulate stimulation to, for example, decrease sympathetic nervous system activity. Other nonlimiting parameters associated with sympathetic and/or parasympathetic nervous system activity that can be sensed include, for example, sweating during particular times of the day and/or night, sleep states as detected, for example, by an EEG headband (to determine when sympathetic and/or parasympathetic activity is particularly high or low, and potentially correlating a sleep state such as stage 1, 2, 3, 4, or REM with nocturia), and/or motion. In some embodiments, a diagnostic and/or combination diagnostic/stimulation device can be configured to measure a person's heart rate and galvanic skin response for improved estimation of the person's autonomic activity. In some embodiments, a wearable device, such as a wrist-worn device can include both electrodermal activity (EDA) sensors and optical heart rate sensors. This combination of data can in some embodiments advantageously and synergistically provide improved estimation of sympathetic and parasympathetic activity than a single measure alone. In some embodiments, the system can include multiple sensors to measure electrodermal activity in conjunction with heart rate and HRV. Data from the multiple sensors can be analyzed by a hardware or software processor and combined to provide a more accurate estimation of sympathetic and/or parasympathetic activity. In some embodiments, the EDA and HR sensors can be disposed in a wrist-worn device that communicates via a wired or wireless connection to the stimulator or to send data to a centralized remote server (e.g., the cloud). Stimulation parameters, nerve target locations (e.g., tibial and/or saphenous nerves for example) or dosing regimen (e.g., duration or frequency of stimulation sessions) could be adjusted based on estimations of sympathetic and/or parasympathetic activity. Adjustments could be made in real-time, or in subsequent stimulation sessions. In some embodiments, stimulation frequency can be adjusted to either increase or decrease autonomic activity modulated by a single specific nerve, or multiple nerves. For example, in some embodiments, relatively low frequency stimulation of a target nerve (e.g., below a threshold value, e.g., about 5 Hz) can potentially inhibit the nerve and thus decreases sympathetic activity, while higher frequency stimulation (e.g., above a threshold value, e.g., about 5 Hz) can potentially excite the nerve and thus increases sympathetic activity. The same effect can occur with the same or other target nerves to regulate parasympathetic activity. In other words, in some embodiments, relatively low frequency stimulation of the target nerve (e.g., below a threshold value, e.g., about 5 Hz) can potentially inhibit the nerve and thus decreases parasympathetic activity, while higher frequency stimulation (e.g., above a threshold value, e.g., about 5 Hz) can potentially excite the nerve and thus increases parasympathetic activity. Not to be limited by theory, depending on the stimulation parameters for example, in some cases stimulating the target nerve can increase or decrease either sympathetic activity, parasympathetic activity, or both. In some embodiments, stimulation of the saphenous nerve can affect sympathetic activity, and stimulation of the tibial nerve can affect parasympathetic activity.
In some embodiments, any form of stimulation as disclosed herein can be utilized to apply stimulation to one, two, or more acupuncture points. In some embodiments, the acupuncture points to be stimulated could include any one, two, three, four, five, six, seven, eight, nine, ten, or any other number of the following: BL18 (Ganshu), BL23 (Shenshu), BL27 (Xiaochangshu); BL28 (Pangguangshu); BL32 (Ciliao); BL33 (Zhongliao); BL53 (Baohuang); CV2 (Qugu); CV3 (Zhongji); CV4 (Guanyuan); CV5 (Shinen); CV6 (Qihai); GB34 (Yanglingquan); KI7 (Fuliu); KI10 (Yingu); LR1 (Dadun); LR2 (Xingjian); LR8 (Quan); N-BW-38 (Xiajiaoshu); SP6 (Sanyinjiao); SP9 (Yinlingquan); and/or ST28 (Shuidao). In some embodiments, the points to be stimulated include BL18, BL23, BL28, and CV2. In some embodiments, the points to be stimulated include ST28, SP6, BL23, BL28, BL32, BL33, BL53, CV3, and N-BW-38. In some embodiments, the points to be stimulated include SP6, BL23, BL27, BL28, BL33, and CV4. In some embodiments, the points to be stimulated include SP9, LR1, LR2, CV4, and CV6. In some embodiments, the points to be stimulated include SP6, SP9, BL23, CV3, and CV6. In some embodiments, the points to be stimulated include SP9 and GB34. In some embodiments, the points to be stimulated include SP9, KI7, KI10, and LR8. In some embodiments, the point to be stimulated is either CV5 alone or BL39 alone, or a combination thereof. Other permutations of stimulation points are also possible, depending on the desired clinical result.
The system may run on a selection of pre-specified programs that vary stimulation parameters and target one or more nerves individually or in combination to improve symptoms of inflammatory bowel disease or another disease in a specific patient.
Alternatively, the system may use closed loop feedback or statistical analyses or machine learning techniques that utilize a number of parameters including: the subject's symptomatic history, including voiding events, or manually entered bowel event indicated on board the device or a secondary device; direct detection of sympathetic and parasympathetic tone in the GI tract or general circuitry, including HRV and galvanic skin response; previous usage of device, e.g., purely sympathetic excitation may be enhanced by brief periods of parasympathetic balance; medical history; medication usage; activity or steps.
Some embodiments of a system could centrally store data from a plurality of sensors worn by multiple wearers on a remote server system (e.g., the cloud), along with other relevant demographic data about each wearer, including age, weight, height, gender, ethnicity, etc. Data collected from multiple wearers can be analyzed using standard statistical analysis, machine learning, deep learning, or big data techniques, such as a logistic regression or Naive Bayes classifier (or other classifiers), to improve prediction of inflammation by determining correlations between biological measures and other recorded symptom events and inflammation events. These correlations can be used to set parameters of the stimulation waveform applied by the stimulation device, determine best time to apply stimulation therapy, and/or adapt the stimulation waveform applied by the therapy unit in real time.
In some embodiments, one, two, or more sensors can be housed in the device to collect, store, and analyze biological measures about the wearer including, but not limited to, motion (e.g., accelerometers, gyroscopes, magnetometer, bend sensors), ground reaction force or foot pressure (e.g., force sensors or pressure insoles), muscle activity (e.g., EMG), cardiovascular measures (e.g., heart rate, heart rate variability (HRV), photoplethysmography (PPG), or ventricular and/or atrial dyssynchrony using electrodes to measure ECG and/or heart rhythm abnormalities), skin conductance (e.g., skin conductance response, galvanic skin response), respiratory rate, skin temperature, pupil diameter, and sleep state (e.g., awake, light sleep, deep sleep, REM). Using standard statistical analysis, machine learning, deep learning, or big data techniques, such as a logistical regression or a Naïve Bayesian classifier, these biological measures can be analyzed to assess the wearer's activity state, such as sedentary versus active, level of stress and the like, which in turn, can serve as a predictor of inflammation and/or GI symptoms.
In some embodiments, the base station 600 is used to receive and transmit relatively large amounts of data that may require a high bandwidth, such as the transmission of raw data from the therapy device, which may be about or at least about 10 to 100 Mb/day, or about or at least about 10, 20, 30, 40, or 50 Mb/day. In some embodiments, the data may be stored in memory in the base station 600 and transmitted at another interval, such as weekly or twice weekly, with a scaling up of the bandwidth of transmission. The high bandwidth transmission of the raw data can occur daily while the therapy device is being charged, such as at night during a regular charging period. In some embodiments, the raw data can be processed by the cloud and/or the physician into processed data and sent back to the therapy device.
In some embodiments, the system may optionally include a portable computing device 606, such as a smart phone or tablet, to provide a secondary display and user interface for the patient and to run applications to more easily control the therapy device and view the raw and processed data. The portable computing device can be used to make patient or physician adjustments to the therapy device, such as adjusting the stimulation parameters and dosing, and can receive device state data from the therapy device, which includes data relating to the device, such as when the device was used, errors, therapy parameters such as amplitude and when they were set and delivered. In some embodiments, the portable computing device 606 can receive processed data from the cloud 602 through a cellular network and/or through an internet connection using Wi-Fi, for example.
The band 702 can have electrodes 724 and may also include memory to store identification information or may include some other form of identifier 726 as described herein.
The base station 704 can include charging circuitry 728, which may also be inductive and can transmit power to the complementary charging circuitry 714 on the therapy unit 700. The base station 704 can also have a processor and memory for storing and executing instructions and programs. The base station 704 can further include a communication module 732, which may be cellular, to communicate with the cloud, and another communication module 734, which may be wireless and used to communicate with the therapy unit.
In some embodiments, the device can be a biological sensor, such as a heart rate or respiratory monitor worn on the body, which could include an integrated nerve stimulator. In some embodiments, the nerve stimulator and sensor device can be separate devices that communicate wirelessly. In some embodiments, the device can measure a biological measurement over the course of minutes, hours, days, weeks and/or months to determine whether the patient's condition is increasing, decreasing, or staying the same. In some embodiments, the measurements are time averaged over a window, which can be days, weeks, or months. In some embodiments, a sensor, such as a motion sensor, IMU, or GPS, can be used to detect patient activity, which can affect other measurements. In some embodiments, the sensor can be an electrode that measures galvanic skin response, which can be correlated to stress, a known trigger for inflammatory bowel disease, inflammation, or symptoms caused by other inflammatory conditions. In some embodiments, measurements are collected at the same time each day with the same conditions to improve measurement consistency and to reduce variability. In some embodiments, the stimulator is applied to one wrist or arm or ear to stimulate one peripheral nerve in the arm, such as the median nerve or ABVN, or specific nerve location, such as an acu-pressure point or meridians.
The number of episodes of symptoms such as inflammatory bowel disease could be detected in various ways to control the stimulation applied by system and devices. In some embodiments, the patient can enter events related to symptoms of inflammatory bowel disease, including but not limited to fecal voiding events, urgency events, incontinence events, or abdominal pain on a mobile device. In some embodiments, location services on the device, such as GPS, can detect when the person has entered a building or bathroom. Information regarding bowel voiding can be combined in some embodiments with an understanding of the amount of food and fluids a person has consumed in order to better apply a desired amount of treatment. For example, in days where more food and drink were consumed by an individual, more bowel voiding would be expected.
In some embodiments, the systems and methods use one or more sensor devices to measure or detect breathing activity, heart rate, or blood flow pulsatility over time, then based on a predetermined relation of the measured activity, a stimulator is instructed to provide neurostimulation to at least one, two, or more of the nerve targets described. In some embodiments, the stimulated nerve targets may selectively activate the parasympathetic nervous system, the sympathetic nervous system, or both.
In some embodiments, disclosed herein are systems and methods for stimulating a plurality of nerves for the treatment of conditions including but not limited to IBD. Stimulation of 2, 3, or more nerves, such as the saphenous and tibial nerve could be used for the treatment of conditions such as IBD. Dual nerve stimulation can in some cases synergistically increase the effectiveness of therapy by combining synergistically the effects of, for example, saphenous and tibial nerve stimulation. In some embodiments, including those disclosed in connection with
In some embodiments, as illustrated schematically in
Another possible configuration shown in
In some embodiments, stimulation can be timed to changes in heart rate and/or rhythm, as a transient tachycardia arises with every breath. A heart rate sensor could detect this rhythmic tachycardia and generate a control signal to trigger stimulation. Heart rate or rhythm sensor could be multiple or single-lead ECG sensors, wrist worn optical heart rate sensor, also known as photoplethysmograms (PPG).
In some embodiments, disclosed herein is a wearable device to deliver patterned transcutaneous electrical stimulation to peripheral nerves. In some embodiments, patterned stimulation can include one or more techniques, including but not limited to synchronizing stimulation to a phase or feature of the cardiac cycle, synchronizing stimulation to specific features of neural oscillations such as power or frequency, and alternating stimulation bilaterally across two or more nerve targets. Synchronizing stimulation to neural oscillations can promote biofeedback for the patient by promoting and reinforcing alpha wave activity in the brain, which has been shown to improve symptoms associated with inflammation. The device can include any number of a controller; a first peripheral nerve effector, comprising at least one stimulation electrode configured to be positioned to transcutaneously modulate a first afferent peripheral nerve; and at least one biomedical sensor or data input source configured to provide feedback information. The feedback information could include physiologic parameters including vital signs, measures of sympathetic or parasympathetic activity, and other information disclosed herein. The controller can include a processor and a memory for receiving the feedback information from the sensor, that when executed by the processor, cause the device to adjust one or more parameters of a first electrical stimulus based at least in part on the feedback information; and/or deliver the first electrical stimulus to the first afferent peripheral nerve to the first peripheral nerve effector. The first electrical stimulus can include patterned, such as burst (e.g., theta burst) electrical stimulation configured to induce neural plasticity and reduce symptoms due to inflammatory diseases. The stimulation can be continuous, intermittent, or intermediate theta burst stimulation in some embodiments. The device can also be configured to deliver a priming electrical nerve stimulation signal prior to the first electrical stimulation signal, which can be a non-theta burst stimulation signal. The device can further include a second peripheral nerve effector, including at least one stimulation electrode configured to be positioned to transcutaneously modulate a second afferent peripheral nerve, and is configured to deliver a second electrical nerve stimulation signal transcutaneously to the afferent peripheral nerve of the user. The signal can include, for example, electrical theta burst stimulation.
In some embodiments, inhibition of the inflammatory response by stimulation may also reduce the symptoms of other diseases, including but not limited to, rheumatoid arthritis or other non-limiting examples disclosed herein, or acute or chronic injury/trauma. Direct stimulation could be applied to the joint in some cases. Stimulation could be gated based on swelling measured in the joint, pain or activities of daily living scores, and the like.
In some embodiments, inflammation can be assessed in a patient by a sensor or plurality of sensors to quantify the level of inflammation. Inflammation is a central component of innate (non-specific) immunity. In generic terms, inflammation is a local response to cellular injury that is marked by increased blood flow, capillary dilatation, leucocyte infiltration, and the localized production of a host of chemical mediators, which serves to initiate the elimination of toxic agents and the repair of damaged tissue. Termination of inflammation is an active process involving cytokines and other anti-inflammatory mediators, particularly lipids, rather than simply being the switching off of pro-inflammatory pathways.
Inflammation can be assessed non-invasively in some cases by ultrasound molecular imaging with a dual P- and E-selectin-targeted contrast agent.
Inflammation can also be assessed by a range of blood cellular markers (e.g. total leukocytes, granulocytes and activated monocytes) and soluble mediators (cytokines and chemokines (TNF, IL-1, IL-6, IL-8, CC chemokine ligand 2 (CCL2), CCL3, CCL5), adhesion molecules (vascular cell adhesion molecule-1, intercellular adhesion molecule-1, E-selectin), adipokines (adiponectin) and acute-phase proteins (ESR, CRP, serum amyloid A, fibrinogen)). The markers can be assessed via periodic blood draws, or indwelling biosensors in some cases. In some embodiments, disclosed herein are wearable systems and methods that can utilize transcutaneous sensory stimulation in the form of a burst pattern, e.g., a theta burst pattern to improve inflammatory bowel disease, and/or a variety of other inflammatory conditions, including but not limited to those disclosed herein. Noninvasive peripheral nerve theta burst stimulation may be effective in some cases in driving cortical or spinal plasticity more efficiently than continuous stimulation to reduce symptoms and improve an individual's quality of life.
In some embodiments, the stimulation involves patterns of electromagnetic stimulation of peripheral nerves. The patterned stimulation could be a bursting stimulation, such as an on/off pattern that repeats at regular intervals (e.g., on for 10 ms, off for 20 ms, etc.), or non-burst patterned stimulation that can be more complex in some embodiments, such as a stochastic pattern or a sinusoidal envelope for example. The electromagnetic stimulation could include, for example, electrical energy, mechanical energy (e.g., vibration), magnetic energy, ultrasound energy, radiofrequency energy, thermal energy, light energy (such as infrared or ultraviolet energy for example), and/or microwave energy, or combinations thereof. In some embodiments, the stimulation is limited to only electrical energy (e.g., no magnetic or other types of energy are applied). The peripheral stimulation could include transcutaneous, percutaneous, and/or implanted stimulation.
Some embodiments can involve rhythmic bursting on the median, radial, and/or ulnar nerves to balance sympathetic and parasympathetic tone.
Not to be limited by theory, alternating bursting stimulation on the medial, radial, and/or ulnar nerves can prevent inflammation by having a synergistic effect that increases input to the nucleus of the solitary tract (NTS) in the medulla and influences the activity of NTS neurons projecting to the inhibitory vagal efferent neurons of the dorsal vagal nucleus (DVN) and nucleus ambiguous (NA). Alternating bursting stimulation of the medial, radial, and/or ulnar nerves may also excite NTS neurons sending excitatory projections to the caudal ventrolateral medulla (CVLM). The CVLM inhibits the rostroventrolateral medulla (RVLM) which is the primary source of excitatory drive to sympathetic preganglionic neurons in the intermediolateral cell column (IML) of the spinal cord. This inhibition could decrease sympathetic activity. This stimulation pattern could improve sympathovagal balance to reduce inflammation.
Interferential Stimulation can be utilized in some cases. In some embodiments, a device can include a plurality of electrodes, e.g., four electrodes to where a first electrode pair stimulates at a specified first frequency, f Hz, and a second electrode pair stimulates at a second frequency slightly higher or lower than the first pair, f±x Hz. In some embodiments, the second frequency can be different from that of, but within about ±20%, 15%, 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2%, or 1% of the first frequency. In some embodiments, stimulation does not involve interferential stimulation.
In some embodiments, the electrode pairs can be spaced on the limb, as shown in
The stimulation frequency can be varied depending on the desired clinical result. In some embodiments, a relatively higher frequency, such as between about 10 Hz and about 33 Hz, between about 10 Hz and about 30 Hz, between about 10 Hz and about 20 Hz, or between about 20 Hz and about 33 Hz, or about or at least about 10 Hz, 15 Hz, 20 Hz, 25 Hz, 30 Hz, 33 Hz, 35 Hz, or more can be used. The stimulation frequency can also be tailored to the specific nerve targeted. In some embodiments, lower stimulation rates such as 2 Hz can have an excitatory effect. However, in some embodiments, a frequency of about or no more than about 10 Hz, 9 Hz, 8 Hz, 7 Hz, 6 Hz, 5 Hz, 4 Hz, 3 Hz, 2 Hz, or 1 Hz can be utilized. In some embodiments, the stimulation frequency could be in the kHz range, such as, for example, between about 1 kHz and about 100 kHz, such as between about 10 kHz and about 50 kHz. The stimulation could be regular, irregular, or random in some embodiments. In some embodiments, a frequency or a plurality of frequencies for one, two, or more nerves could be selected from, for example, about 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 35, 40, 45, 50 Hz. In some embodiments, two or more of the same or different frequencies or frequency ranges can be applied to the same or different target nerves.
In some embodiments, waveforms including those described herein can be modified over time in order to minimize certain effects, such as habituation. One way of decreasing habituation is to modify the frequency, pulse width, or amplitude of the stimulation. For instance, randomizing or pseudo-randomizing parameters such as, for example, the frequency or pulse width can reduce habituation. Using a Gaussian distribution for randomization can be effective in some cases, and used in such waveforms as stochastic waveforms. Another way of reducing habituation is to the lower the frequency below a certain threshold, such as, for example, no more than about 60 Hz, 55 Hz, 50 Hz, 45 Hz, or 40 Hz, in which humans tend not to habituate. Bursting to improve efficiency or efficacy of stimulation can also be used. Not to be limited by theory, bursting at a rhythmic pattern can improve efficiency of therapeutic benefit by promoting plasticity of corticospinal circuits. Rhythmic or pseudorandom bursting patterns can prevent habituation of nerves, which occurs with constant stimulation.
Some embodiments can involve stimulation patterns (e.g., bursting, pulse patterns, random, pseudo-random, or noise) selected to improve the efficiency and efficacy of stimulation. In some embodiments, as illustrated schematically in
In some embodiments, the stimulation involves non-invasive transcutaneous electrical patterned or burst stimulation of peripheral nerves, including afferent and/or efferent nerves. Not to be limited by theory, but burst stimulation of peripheral nerves can unexpectedly result in one or more of the following compared with conventional or continuous stimulation: greater efficacy; greater plasticity; increased tolerance or tolerability; reduced effects of habituation; increased comfort; and/or reduced treatment time required to achieve the same beneficial effects. Burst stimulation of peripheral nerves, including afferent nerves, can in some cases deliver a more efficacious therapy by remotely accelerating plasticity of one or more central nervous system (e.g., brain and/or spinal cord) circuits, in other words creating plasticity in neural circuits for a period of time that is far longer than the duration of the stimulation session, such as, for example, about or at least about 6 hours, 12 hours, 24 hours, 2 days, 3 days, 4 days, 5 days, 6 days, 7 days, 2 weeks, 3 weeks, 1 month, 2 months, 3 months, 4 months, 5 months, 6 months, 9 months, 12 months, 18 months, 24 months, 36 months, or even longer. Peripheral stimulation in some cases can be more convenient and comfortable for the user than central stimulation (e.g., transcranial stimulation and/or spinal stimulation) and can be more suitable for home and ambulatory use.
In some embodiments, the burst stimulation includes theta burst stimulation. Theta burst stimulation (TBS) is a patterned form of repetitive stimulation that uses high frequency pulses separated by varying inter-burst intervals. Originally used for the induction of long term potentiation in hippocampal learning and memory research, theta burst stimulation in the form of repetitive magnetic stimulation (rTMS) has been demonstrated to noninvasively induce plasticity in humans in the motor, sensory and visual cortex. Depending on various parameters including the duration and continuity of stimulation, a long term potentiation or depression (LTP/LTD) like effect can be observed, which are surrogate measures of synaptic efficacy. The number of sessions and the spacing interval between individual sessions of stimulation can also have an effect on the duration of the induced response. The level of muscle relaxation before or during stimulation can also affect the resulting direction or amplitude of plasticity induction suggesting that homeostatic mechanisms are in place that adjust the threshold for plasticity depending on prior synaptic activity. The effective modulation of nervous system plasticity demonstrated with theta burst stimulation can have great potential for the treatment of various neurologic disorders, and can have an effect on other central neural circuits.
In some embodiments, theta burst stimulation can take the form of intermittent theta burst stimulation (iTBS), continuous theta burst stimulation (cTBS), and intermediate theta burst stimulation (imTBS). Non-limiting examples of iTBS, cTBS, and imTBS are illustrated in
In some embodiments, sympathetic and parasympathetic activity are assessed prior to initial stimulation to select specific nerve targets, stimulation waveforms, stimulator parameters, or dosing of stimulation (e.g., time of day, duration of stimulation, number of times per day or week). In other embodiments, a default stimulation is applied in a trial fashion, and only if a person does not respond to treatment is sympathetic and parasympathetic activity assessed. In some embodiments, sympathetic and parasympathetic activity are assessed over a single day or over multiple days during an initial period of treatment to measure any changes in autonomic activity. In some embodiments, IBD or other symptoms may be tracked by the patient, either manually or on paper, onboard the stimulation device, or on an external computing device such as a smartphone, tablet, laptop, etc. to be correlated with parameters, such as HRV and changes in autonomic activity, for example. As illustrated in
In some embodiments, if a person does not respond to therapy, a number of parameters can be altered to modify therapy, including but not limited to increasing or decreasing, or otherwise changing any number of the following: duration of session (e.g., 20-120 minutes); number of sessions per day or week (e.g., 2 times per day to 3 times per week); time of day or night of stimulation; stimulation frequency; bursting or other stimulation pattern (including bursting frequency); nerve target (e.g., saphenous or tibial); and/or stimulation amplitude.
In some embodiments, therapy can have an unexpectedly synergistic effect when combined with one, two, or more pharmacologic agents. Anti-inflammatory drugs are often the first step in the treatment of inflammatory bowel disease. Anti-inflammatories include corticosteroids and aminosalicylates, such as mesalamine (Asacol HD, Delzicol, others), balsalazide (Colazal) and olsalazine (Dipentum). Immunosuppressant drugs can also be utilized in therapy. Some examples of immunosuppressant drugs include azathioprine (Azasan, Imuran), mercaptopurine (Purinethol, Purixan), cyclosporine (Gengraf, Neoral, Sandimmune), tacrolimus, and methotrexate (Trexall). One class of drugs called tumor necrosis factor (TNF)-alpha inhibitors, or biologics, works by neutralizing a protein produced by the immune system, such as with a monoclonal antibody. Examples include infliximab (Remicade), adalimumab (Humira) and golimumab (Simponi). Other biologic therapies that may be used are natalizumab (Tysabri), vedolizumab (Entyvio) and ustekinumab (Stelara). Antibiotics may be used in addition to other medications or when infection is a concern—in cases of perianal Crohn's disease, small intestinal bacterial overgrowth (SIBO), and others for example. Frequently prescribed antibiotics include a quinolone such as ciprofloxacin (Cipro), metronidazole (Flagyl), vancomycin (Vancocin), and rifaximin (Xifaxan), among others.
In some embodiments, the effector can be excitatory to the nerve. In other embodiments, the effector can be inhibitory to the nerve. In some embodiments, the system can be used to excite the nerve during some portions of the treatment and inhibit the nerve during other portions of the treatment.
In several embodiments, over-the-counter agents such as loperamide and bismuth compounds (e.g., loperamide hydrochloride and bismuth subsalicylate) work in a synergistically beneficial manner with the neuromodulation (e.g., neurostimulation) embodiments described herein. In some embodiments, the use of neuromodulation (e.g., neurostimulation) as described herein results in a greater half-life of pharmacological agents and/or a reduced dosage. This can be particularly helpful to manage the side effects of these agents, which can be exacerbated in patients with sensitive digestive tracts. Dosages when combined with neurostimulation are reduced, in some embodiments, by at least 5%, 10-20%, 20-40%, 40-60% or more (including overlapping ranges therein) as compared to dosages needed to achieve a similar effect in the absence of neurostimulation. In one embodiment, the combination of neurostimulation and a pharmacological agent allows the pharmacological agent to work more quickly (e.g., 20-60% more rapidly, or higher).
Some embodiments, as shown in
Afferent nerves in the periphery or distal limbs, including but not limited to the median nerve, are connected via neural pathways to sensitized peripheral and central neurons connected to the nucleus tractus solitarus; vagus nerve; or other regions of the brain and brain stem associated with regulation of inflammation, as illustrated in
In some embodiments, the treatment device 10 is a wrist-worn device that can include, for example, 1) an array of electrodes 16 encircling the wrist, 2) a skin interface to ensure good electrical contact to the person, 3) an electronics box or housing 12 containing the stimulator or pulse generator 18, sensors 20, and other associated electronics such as a controller or processor 22 for executing instructions, memory 24 for storing instructions, a user interface 26 which can include a display and buttons, a communications module 28, a battery 30 that can be rechargeable, and optionally an inductive coil 32 for charging the battery 30, and the like, and 4) a band to hold all the components together and securely fasten the device around the wrist of an individual.
In
One embodiment, as shown in
In some embodiments, the wearable monitor unit 312 can have a housing with a user interface 322 that encloses one or more sensors 324. In some embodiments, the wearable monitor 312 can be used to measure heart rate, rhythm, heart rate variability (HRV), or other measures correlated or related to inflammatory bowel disease or other inflammatory conditions, or response of the autonomic nervous system. In some embodiments, the wearable monitor 312 can have one or more electrodes 326 located on the base of the housing that makes contact with the patient's skin. In addition, or alternatively, the wearable monitor 312 can have a band 328 or other securement feature with one or more electrodes on the skin facing side of the band 328. In some embodiments, the wearable monitor unit 312 has exactly or no more than 2 or 3 electrodes, or at least 2 or 3 electrodes. In some embodiments, the wearable monitor unit 312 lacks a power source and relies on the power source 318 in the therapy unit 314 for power. In other embodiments, both the wearable monitor unit 312 and the therapy unit 314 have power sources. In some embodiments, only the wearable monitor unit 312 has a power source and the therapy unit relies on power from the monitoring unit.
In some embodiments, as shown in
In some embodiments, the sensors can be located in or on the therapy unit instead of the monitoring unit. In some embodiments, the sensors can be located on both the therapy unit and the monitoring unit. In some embodiments, one or more sensors can be located on a separate wearable device, such as a sensor on a band that can be worn around the arm, leg, neck, or chest, or a sensor implanted inside the body, which may communicate via a wired or wireless connection with the therapy unit and/or the monitoring unit.
In some embodiments, the monitor unit can instead be carried by the user in, for example, the user's hand or pocket, rather than be worn. For example, a monitor unit carried by the user can be a smart phone, such as an Android smartphone or iPhone.
In some embodiments, the two-part system or the monitor unit may instruct the user to perform an action, such as to sit and relax the arm, or to remain still or to attempt to remain still while the wearable monitor unit takes a measurement with one of the sensors.
In some embodiments, the user interface can include a display. In some embodiments, the display can be a touch screen display or capacitive sensor. In some embodiments, the display can be an array of LED lights. In some embodiments, the user interface can include one or more buttons, a dial, and/or a keyboard.
In some embodiments, the electrodes can be dry-contact (e.g., fabric, metal, silicone or any other plastic impregnated with conductive fillers, or a combination), use a conductive gel (e.g., hydrogels), or have a wet electrode surface (e.g., a sponge with water or conductive liquids or gels), or have fine micro needles, for example. In some embodiments, the electrodes can have a foam backing.
In some embodiments, the monitor unit can be a wearable monitor having a housing with a user interface. The housing can use a plurality of sensors to collect, store, and analyze biological measures about the wearer including, but not limited to, blood pressure, motion (e.g., accelerometers, gyroscopes, magnetometer, bend sensors), muscle activity (e.g., EMG using electrodes), cardiovascular rhythm measures (e.g., heart rate, heart rate variability, or ventricular and/or atrial dyssynchrony using electrodes to measure ECG, heart rhythm abnormalities), skin conductance (e.g., skin conductance response, galvanic skin response, using electrodes), skin temperature, pupil diameter, and sleep state (e.g., awake, light sleep, deep sleep, REM). Heart rhythm measures can be recorded with optical, electrical, and/or accelerometry-based sensors. In particular, studies have shown that increased stress levels can increase blood pressure. Activities such as exercise, can also affect onset of inflammatory bowel diseases or other inflammatory conditions—measuring accelerometry (motion), heart rate, etc. could help identify these activities and normalize the measurements by similar activities. Thus, using standard statistical analysis, machine learning, deep learning, or big data techniques, such as a logistical regression or Naïve Bayes classifier, these biological measures can be analyzed to assess a person's state, such as level of stress, which in turn, can serve as a predictor for inflammatory bowel disease or other inflammatory conditions. In some embodiments, the device can provide stimulation based on measurements of one or more biological measures, a determination of a person's state, and/or a prediction of inflammatory bowel disease or other inflammatory conditions.
In some embodiments, the responsiveness of stimulation could be dependent on one, two, or more sensors housed in the device to collect, store, and analyze biological measures about the wearer including, but not limited to, motion (e.g., accelerometers, gyroscopes, magnetometer, bend sensors), ground reaction force or foot pressure (e.g., force sensors or pressure insoles), muscle activity (e.g., EMG), cardiovascular measures (e.g., heart rate, heart rate variability (HRV), photoplethysmography (PPG), or ventricular and/or atrial dyssynchrony using electrodes to measure ECG and/or heart rhythm abnormalities), skin conductance (e.g., skin conductance response, galvanic skin response), respiratory rate, skin temperature, pupil diameter, and sleep state (e.g., awake, light sleep, deep sleep, REM). Using standard statistical analysis, machine learning, deep learning, or big data techniques, such as a logistical regression or a Naïve Bayesian classifier, these biological measures can be analyzed to assess the wearer's activity state, such as sedentary versus active, level of stress and the like, which in turn, can serve as a predictor inflammatory bowel disease or other inflammatory conditions.
In some embodiments, stimulation of one, two, or more nerves in the upper and/or lower extremity can be combined with stimulation of the ABVN, such as by way of the cymba concha or tragus, to modulate vagal activity and restore balance of the autonomic nervous system. In some embodiments, the system can stimulate solely the ABVN.
Stimulation of the cymba concha or tragus can occur, for example, noninvasively via a plug, earpiece, or other device that can include electrodes for transcutaneous electrical stimulation in some cases.
In some embodiments, a system can include a plurality of stimulators that communicate with each other wirelessly and provided a synchronized, patterned stimulation. In some embodiments, multiple stimulators may be in electrical connection with multiple electrode pairs to stimulate multiple nerves simultaneously. In one embodiment, a system can include a stimulator on the wrist to target median nerve and a stimulator in the ear to target the ABVN. Each stimulator in the system can communicate with each other via a wired or wireless connection. Multiple stimulators can provide synchronized stimulation to the multiple nerves. Stimulation may be, for example, burst, offset, or alternating between the multiple nerves.
The device could also be responsive to number of episodes of symptoms, including but not limited voiding, incontinence, sense of urgency, nocturia, abdominal or intestinal pain. If more episodes occur in one day, treatment can be increased by increasing the amplitude of the stimulation, duration of the stimulation, or number of treatment sessions, for example.
The number of episodes of symptoms could be detected in various ways to control the stimulation applied by system and devices. In some embodiments, the patient can enter events related to symptoms, including but not limited voiding, incontinence, sense of urgency, nocturia, abdominal or intestinal pain.
One embodiment of the system could centrally store biological measures from multiple wearers on a server system (e.g., the cloud), along with other relevant demographic data about each user, including age, weight, height, gender, ethnicity, etc. Data collected from multiple wearers can be analyzed using standard statistical analysis, machine learning, deep learning, or big data techniques, such as a logistic regression or Naive Bayes classifier (or other classifiers), to improve prediction of episodes of inflammatory bowel disease or other inflammatory conditions by determining correlations between biological measures and other recorded symptom events associated with the treated disease. These correlations can be used to set parameters of the stimulation waveform applied by the therapy unit, determine best time to apply stimulation therapy, and/or adapt the stimulation waveform applied by the therapy unit in real time.
In one embodiment of the system, the wearable monitor automatically detects and records the dosage and consumption of medications to (1) track compliance of the patient; (2) combine with the logging of symptom events to assess therapeutic effectiveness, and (3) determine or predict unpleasant symptoms associated with inflammatory bowel disease or other inflammatory diseases. The dosage and consumption of medications can be detected and recorded in multiple ways, including (1) using a visual scanner to record a marking on the pill pack or bottle each time medication is consumed, (2) a smart pill cap with force sensors and a wireless transmitter to detect each time the medication is consumed from a pill bottle, (3) an RFID chip that is of similar size and shape as a pill that is consumed with each dosage of medication that is activated by digestion and communicates with the monitor device, (4) an RFID chip embedded in a sugar pill that is consumed with each dosage of medication that is activated by digestion and communicates with the monitor device, (5) a pill with a visual encoding that is scanned and recorded by a camera on the monitor unit each time medication is consumed, or (6) by having the patient logging drug consumption into the device.
The system can also log the patient satisfaction after each stimulation session or the end of a specified period, like a day or week or month, via an input on the device, which provides another piece of information to help feedback application of therapy. In some cases, if a person is satisfied, the therapy is maintained at the current stimulation waveforms and levels. In other cases, this may mean that the stimulation treatment may need to be optimized, for example, by changing stimulation parameters such as waveform frequency or amplitude.
In some embodiments, the wearable monitor can have a visual, auditory, tactile (e.g., squeezing band), or vibrotactile cues to notify the wearer of key events based on analysis of biological measures, including, but not limited to, prediction of symptoms caused by inflammatory bowel diseases or other inflammatory conditions, and/or increase in stress level, heart rate, heart rate variability, or other parameters. The cuing system could also notify the wearer of other predetermined events or reminders set by the wearer.
In some embodiments, the form of the wearable monitor and/or therapy unit could be a wrist band or watch, a ring, a glove, an arm sleeve or arm band or cuff, knee band, sock, leg sleeve or cuff, an ear piece/headphone, head band, a necklace or neck band, or a compliant patch that conforms to multiple locations on the body.
In one embodiment, the wearable monitor can have a processing unit and memory that collects, stores, processes, and analyzes the biological measures, along with other data input by the wearer.
In some embodiments, the wearable monitor can take user input about events, including diet history, medication history, caffeine intake, alcohol intake, sodium intake, etc. The monitor can use accelerometers to measure specific movements, gestures, or tapping patterns to record user inputs at specific prompts. Other touch sensors, such as resistive strips or pressure sensitive screens, could be used to measure specific gestures to record user inputs. These gesture-based measures to record user input minimize the complexity of steps required to input user data into the device. The data can be stored in memory and processed by the processing unit. In some embodiments, the data can be transmitted from the wearable monitor to an external computing device.
In one embodiment, the wearable monitor and/or the therapy unit can connect with other applications, such as calendars and activity logs, to sync and track events or a saved calendar can be saved and stored on the device. In some embodiments, the wearable monitor and/or the therapy unit can communicate with a variety of computing devices, such as a smart phone, a smart watch, a tablet, a laptop computer, or a desktop computer, for example, that have these applications. In some embodiments, the wearable monitor can include an ambulatory blood pressure monitor.
In one embodiment, the monitor unit and/or therapy unit can have a GPS or similar device to track the location and assess activity of the wearer. GPS measures can be combined with mapping or location systems to determine context of the wearer's activity (e.g., gym, office, home) or determine changes in elevation during specific activities, such as running or cycling.
In some embodiments, the therapy unit 502 can include a battery, which may be rechargeable, and electronics to deliver electrical stimulation through the electrodes to the patient's nerves. The electronics can include a stimulator and a microcontroller, and may also include memory and one or more sensors, such as a blood pressure sensor and/or a sensor to measure heart rate and/or heart rate variability and/or galvanic skin response, or one, two, or more ECG electrodes to measure dyssynchrony. In some embodiments, the device is able to sense the impedance of the electrodes in order to assess the integrity of the electrode to skin interface. In some embodiments, there can be an electrical indication (e.g. reading of a chip, pushing in of a sensor on the connector, etc.) to detect integrity of the connection between the band and the therapy unit. In some embodiments, the therapy unit 502 can have one or more LEDs, mini OLED screens, LCS, or indicators 501 that can indicate the status of the therapy unit 502, such as whether the therapy unit 502 is connected to the band 500, the power remaining in the battery of the therapy unit 502, whether a stimulation is being delivered, the stimulation level, whether data is being transmitted, whether a sensor measurement is being taken, whether a calibration routine is being performed, whether the therapy unit 502 is initializing, whether the therapy unit 502 is paired with another device such as a smart watch and/or smart phone, whether the battery is being charged, and the like. In some embodiments, the therapy unit 502 may also include a user interface 503, such as one or more buttons.
In some embodiments, the kit illustrated in
In some embodiments, the base station 600 is used to receive and transmit relatively large amounts of data that may require a high bandwidth, such as the transmission of raw data from the therapy device, which may be about 10 to 100 Mb/day, or about 10, 20, 30, 40, or 50 Mb/day. In some embodiments, the data may be stored in memory in the base station 600 and transmitted at another interval, such as weekly or twice weekly, with a scaling up of the bandwidth of transmission. The high bandwidth transmission of the raw data can occur daily while the therapy device is being charged, such as at night during a regular charging period. In some embodiments, the raw data can be processed by the cloud and/or the physician into processed data and sent back to the therapy device.
In some embodiments, the system may optionally include a portable computing device 606, such as a smart phone or tablet, to provide a secondary display and user interface for the patient and to run applications to more easily control the therapy device and view the raw and processed data. The portable computing device can be used to make patient or physician adjustments to the therapy device, such as adjusting the stimulation parameters and dosing, and can receive device state data from the therapy device, which includes data relating to the device, such as when the device was used, errors, therapy parameters such as amplitude and when they were set and delivered. In some embodiments, the portable computing device 606 can receive processed data from the cloud 602 through a cellular network and/or through an internet connection using Wi-Fi, for example.
The band 702 can have electrodes 724 and may also include memory to store identification information or may include some other form of identifier 726 as described herein.
The base station 704 can include charging circuitry 728, which may also be inductive and can transmit power to the complementary charging circuitry 714 on the therapy unit 700. The base station 704 can also have a processor and memory for storing and executing instructions and programs. The base station 704 can further include a communication module 732, which may be cellular, to communicate with the cloud, and another communication module 734, which may be wireless and used to communicate with the therapy unit.
In some embodiments, the device can be a biological sensor, such as a heart rate monitor worn on the body, which could include an integrated nerve stimulator. In some embodiments, the nerve stimulator and sensor device can be separate devices that communicate wirelessly. In some embodiments, the device can measure a biological measurement over the course of minutes, hours, days, weeks and/or months to determine whether the patient's condition is increasing, decreasing, or staying the same. In some embodiments, the measurements are time averaged over a window, which can be days, weeks, or months. In some embodiments, a sensor, such as a motion sensor, IMU, or GPS, can be used to detect patient activity, which can affect other measurements. In some embodiments, the sensor can be an electrode that measures galvanic skin response, which can be correlated to stress, a known trigger for inflammatory exacerbations. In some embodiments, measurements are collected at the same time each day with the same conditions to improve measurement consistency and to reduce variability. In some embodiments, the stimulator is applied to one wrist or arm or ear to stimulate one peripheral nerve in the arm, such as the median nerve or ABVN, or specific nerve location, such as an acu-pressure point or meridians.
When a feature or element is herein referred to as being “on” another feature or element, it can be directly on the other feature or element or intervening features and/or elements may also be present. In contrast, when a feature or element is referred to as being “directly on” another feature or element, there are no intervening features or elements present. It will also be understood that, when a feature or element is referred to as being “connected”, “attached” or “coupled” to another feature or element, it can be directly connected, attached or coupled to the other feature or element or intervening features or elements may be present. In contrast, when a feature or element is referred to as being “directly connected”, “directly attached” or “directly coupled” to another feature or element, there are no intervening features or elements present. Although described or shown with respect to one embodiment, the features and elements so described or shown can apply to other embodiments. It will also be appreciated by those of skill in the art that references to a structure or feature that is disposed “adjacent” another feature may have portions that overlap or underlie the adjacent feature.
Terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. For example, as used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and/or “comprising,” when used in this specification, specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items and may be abbreviated as “/”.
Spatially relative terms, such as “under”, “below”, “lower”, “over”, “upper” and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is inverted, elements described as “under” or “beneath” other elements or features would then be oriented “over” the other elements or features. Thus, the exemplary term “under” can encompass both an orientation of over and under. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. Similarly, the terms “upwardly”, “downwardly”, “vertical”, “horizontal” and the like are used herein for the purpose of explanation only unless specifically indicated otherwise.
Although the terms “first” and “second” may be used herein to describe various features/elements (including steps), these features/elements should not be limited by these terms, unless the context indicates otherwise. These terms may be used to distinguish one feature/element from another feature/element. Thus, a first feature/element discussed below could be termed a second feature/element, and similarly, a second feature/element discussed below could be termed a first feature/element without departing from the teachings of the present invention.
Throughout this specification and the claims which follow, unless the context requires otherwise, the word “comprise”, and variations such as “comprises” and “comprising” means various components can be co-jointly employed in the methods and articles (e.g., compositions and apparatuses including device and methods). For example, the term “comprising” will be understood to imply the inclusion of any stated elements or steps but not the exclusion of any other elements or steps.
As used herein in the specification and claims, including as used in the examples and unless otherwise expressly specified, all numbers may be read as if prefaced by the word “about” or “approximately,” even if the term does not expressly appear. The phrase “about” or “approximately” may be used when describing magnitude and/or position to indicate that the value and/or position described is within a reasonable expected range of values and/or positions. For example, a numeric value may have a value that is +/−0.1% of the stated value (or range of values), +/−1% of the stated value (or range of values), +/−2% of the stated value (or range of values), +/−5% of the stated value (or range of values), +/−10% of the stated value (or range of values), etc. Any numerical values given herein should also be understood to include about or approximately that value, unless the context indicates otherwise. For example, if the value “10” is disclosed, then “about 10” is also disclosed. Any numerical range recited herein is intended to include all sub-ranges subsumed therein. It is also understood that when a value is disclosed that “less than or equal to” the value, “greater than or equal to the value” and possible ranges between values are also disclosed, as appropriately understood by the skilled artisan. For example, if the value “X” is disclosed the “less than or equal to X” as well as “greater than or equal to X” (e.g., where X is a numerical value) is also disclosed. It is also understood that the throughout the application, data is provided in a number of different formats, and that this data, represents endpoints and starting points, and ranges for any combination of the data points. For example, if a particular data point “10” and a particular data point “15” are disclosed, it is understood that greater than, greater than or equal to, less than, less than or equal to, and equal to 10 and 15 are considered disclosed as well as between 10 and 15. It is also understood that each unit between two particular units are also disclosed. For example, if 10 and 15 are disclosed, then 11, 12, 13, and 14 are also disclosed.
Although various illustrative embodiments are described above, any of a number of changes may be made to various embodiments without departing from the scope of the invention as described by the claims. For example, the order in which various described method steps are performed may often be changed in alternative embodiments, and in other alternative embodiments one or more method steps may be skipped altogether. Optional features of various device and system embodiments may be included in some embodiments and not in others. Therefore, the foregoing description is provided primarily for exemplary purposes and should not be interpreted to limit the scope of the invention as it is set forth in the claims.
The examples and illustrations included herein show, by way of illustration and not of limitation, specific embodiments in which the subject matter may be practiced. As mentioned, other embodiments may be utilized and derived there from, such that structural and logical substitutions and changes may be made without departing from the scope of this disclosure. Such embodiments of the inventive subject matter may be referred to herein individually or collectively by the term “invention” merely for convenience and without intending to voluntarily limit the scope of this application to any single invention or inventive concept, if more than one is, in fact, disclosed. Thus, although specific embodiments have been illustrated and described herein, any arrangement calculated to achieve the same purpose may be substituted for the specific embodiments shown. This disclosure is intended to cover any and all adaptations or variations of various embodiments. Combinations of the above embodiments, and other embodiments not specifically described herein, will be apparent to those of skill in the art upon reviewing the above description. The methods disclosed herein include certain actions taken by a practitioner; however, they can also include any third-party instruction of those actions, either expressly or by implication. For example, actions such as “percutaneously stimulating an afferent peripheral nerve” includes “instructing the stimulation of an afferent peripheral nerve.”
This application is the U.S. National Stage of PCT App. No. PCT/US2019/013966 filed on Jan. 17, 2019, which in turn claims the benefit under 35 U.S.C. § 119(e) as a nonprovisional application of U.S. Pat. App. No. 62/618,557 filed on Jan. 17, 2018, which is hereby incorporated by reference in its entirety. Any and all applications for which a foreign or domestic priority claim is identified in the Application Data Sheet as filed with the present application are hereby incorporated by reference under 37 CFR 1.57. Further form factors, stimulation features, targets, and indications, and methods that can be used with systems and methods as disclosed herein can be found, for example, in U.S. Pat. No. 9,452,287 to Rosenbluth et al., U.S. Pat. No. 9,802,041 to Wong et al., PCT Pub. No. WO 2016/201366 to Wong et al., PCT Pub. No. WO 2017/132067 to Wong et al., PCT Pub. No. WO 2017/053847 to Hamner et al., PCT App. No. PCT/US2017/040920 to Wong et al., and PCT App. No. PCT/US2017/048424 to Rosenbluth et al. filed on Aug. 24, 2017, each of which is hereby incorporated by reference in their entireties.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/US2019/013966 | 1/17/2019 | WO |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO2019/143790 | 7/25/2019 | WO | A |
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| Number | Date | Country | |
|---|---|---|---|
| 20210252278 A1 | Aug 2021 | US |
| Number | Date | Country | |
|---|---|---|---|
| 62618557 | Jan 2018 | US |
