Patent Grant
12059197
The present invention relates to the field of biomedical engineering and medical treatment of diseases and disorders. More specifically, the invention relates to devices and methods for destroying aberrant cell masses, including tumor tissues, such as cancerous tissues of the brain.
Treatment of abnormal cell growth in or on normal body tissues and organs can be achieved in many different ways to achieve reduced cell growth, reduction of the resulting aberrant cell mass, and even destruction of the aberrant cell mass. In general, treatments known in the art involve surgical intervention to physically remove the aberrant cell mass, radiation to kill the cells of the aberrant cell mass, exposure of aberrant cells to toxic chemicals (i.e., chemotherapy), or a combination of two or all three of these. While each treatment modality has shown significant effectiveness in treatment of various cell proliferative diseases, no one technique has been shown to be highly effective at treating all types of cell proliferative diseases and disorders. Furthermore, each technique has significant drawbacks. For example, surgical intervention is highly effective at removal of solid tumors on tissues and organs that are physically accessible and capable of sustaining physical damage or capable of regeneration. However, surgical intervention can be difficult to perform on tumors that are not readily accessible or on organs that do not regenerate (e.g., brain tumors), and can involve substantial physical damage to the patient, requiring extensive recuperation times and follow-on treatments. Likewise, treatment with radiation can result in collateral damage to tissue surrounding the tumor, and can cause long-lasting side-effects, which can lower the quality of life of the patient. Similarly, chemotherapeutic treatments cause systemic damage to the patient, and can result in significant side-effects that might require a long recuperation period or permanent damage to the patient.
In the treatment of tumors, including malignant tumors, it is recognized in the medical arts that it is important to achieve ablation of the undesirable tissue in a well-controlled and precise way without affecting the surrounding healthy tissue. The inventors and their colleagues recently developed a new method to treat tumors, known as irreversible electroporation (IRE). The procedure involves placing electrodes within or near the targeted region to deliver a series of low energy, microsecond electric pulses for approximately 1 minute. These pulses permanently destabilize the cell membranes of the targeted tissue (e.g., tumor), thereby killing the cells. IRE does not affect major blood vessels, does not require the use of drugs and non-thermally kills neoplastic cells in a precise and controllable manner, without significantly damaging surrounding tissue. The inventors and their colleagues also recently showed the complete regression in 12 out of 13 treated tumors in vivo using IRE on a type of aggressive sarcoma implanted in nude mice (Al-Sakere, B. et al., 2007, “Tumor ablation with irreversible electroporation.” PLOS ONE 2.).
Although advances have been made recently in the field of IRE and the concept of treatment of tumors with IRE has been established, the present inventors have recognized that there still exists a need in the art for improved devices and methods for ablating diseased or disordered tissues, such as tumor tissues, using IRE. The present invention addresses those needs.
The present invention provides an advancement over tissue ablation techniques previously devised by providing improved devices and methods for precisely and rapidly ablating diseased, damaged, disordered, or otherwise undesirable biological tissues in situ. As used herein, the term ablation is used to indicate destruction of cells, but not necessarily destruction of the underlying extracellular matrix. More specifically, the present invention provides new devices and methods for ablating target tissues for the treatment of diseases and disorders, and particularly tumors of the brain, using IRE. Use of IRE to decellularize diseased tissue provides a controlled, precise way to destroy aberrant cells of a tissue or organ, such as tumor or cancer cells or masses of the brain.
Non-thermal IRE is a method to kill undesirable cells using electric fields in tissue while preserving the ECM, blood vessels, and neural tubes/myelin sheaths. Certain electrical fields, when applied across a cell, have the ability to permeabilize the cell membrane through a process that has come to be called “electroporation”. When electrical fields permeabilize the cell membrane temporarily, after which the cells survive, the process is known as “reversible electroporation”. Reversible electroporation has become an important tool in biotechnology and medicine. Other electrical fields can cause the cell membrane to become permeabilized, after which the cells die. This deadly process is known as “irreversible electroporation”. According to the present invention, non-thermal irreversible electroporation is a minimally invasive surgical technique to ablate undesirable tissue, for example, tumor tissue. The technique is easy to apply, can be monitored and controlled, is not affected by local blood flow, and does not require the use of adjuvant drugs. The minimally invasive procedure involves placing needle-like electrodes into or around the targeted area to deliver a series of short and intense electric pulses that induce structural changes in the cell membranes that promote cell death. The voltages are applied in order to electroporate tissue without inducing significant Joule heating that would significantly damage major blood vessels and the ECM. For a specific tissue type and set of pulse conditions, the primary parameter determining the volume irreversibly electroporated is the electric field distribution within the tissue. Recent IRE animal experiments have verified the many beneficial effects resulting from this special mode of non-thermal cell ablation, such as preservation of major structures including the extracellular matrix, major blood vessels, and myelin sheaths, no scar formation, as well as its promotion of a beneficial immune response. Due to the nature of the function of the brain, in treatment of brain tissues, such as brain tumors, the total electrical charge delivered is at least as important as maintaining low temperature.
In a first aspect, the present invention provides a method for treating aberrant cell growth in animals. In general, the method comprises inserting one or more electrodes into or immediately adjacent to aberrant cell masses and applying IRE to cause irreversible cell death to the aberrant cells. In some embodiments, two or more electrodes are used to treat aberrant cell masses and effect cell death. The electrodes may be present on the same or different devices. Examples of electrodes include mixed electrode types or different dimensions within the same type, such as mixing up the diameter of the electrodes within the same treatment; the BTX Tweezertrode (7 mm diameter, BTX Harvard Apparatus), which is a commonly used electrode for electroporation in animal models; plate electrodes, such as around the outside of an organ; needle electrodes, such as inserted directly into the tumor site; large plate electrodes, needle electrodes with a large probe, cuvettes; surgical probe and positioning handle, probe configurations with varying electrode diameters and separation distances; single needle-like device with embedded active and ground electrodes; devices with sharp tips; surgical probes; configurations with retractable electrodes two concentric disk electrodes separated by insulating materials; 1-mm electrodes; electrodes spaced 7.5 mm; 2-mm diameter bipolar electrode; BTX 2-Needle Array or needle style electrode; Petri Pulser electrode; bipolar electrodes, two monopolar electrodes; bipolar electrode with 4 embedded electrodes; parallel plate (0.1 mm-10 cm diameter), needle electrode(s) (0.001 mm-1 cm diameter), single probe with embedded disk electrodes (0.001 mm-1 cm diameter), spherical electrodes (0.0001 mm-1 cm diameter); two plate electrodes placed across the tumor; two needles and an axis symmetric needle electrode configuration; three electrodes; three needle electrodes; four electrodes; surgical device with multiple conducting surfaces of variable separations and sizes, hollow needle, needle with perforations; needle electrode with a single probe or parallel needle electrodes; hollow needle open at the tip or with holes distributed throughout; charged electrodes, grounded electrodes, or electric resistors, depending on the treatment protocol; active cooling electrodes, heat sink electrodes, convective cooling electrodes; electrode with expandable/contractible conductive regions; alternating polarity electrodes; balloon expandable electrodes; thirteen gold plated electrodes spaced 2 mm apart. By altering electrode parameters, including diameter, length, separation distance, and type, it will be possible to conveniently tailor the treatment to affect only specific, targeted regions. Preferably, the parameters for IRE are selected to minimize or avoid excessive heating of the treated tissue and surrounding tissue, thus reducing collateral damage to healthy tissue near the aberrant cell mass. In addition, it is preferable to minimize the total electrical charge delivered when treating brain tissue to avoid complications. The methods are particularly well suited for treatment of aberrant cell growths in or on the brain, as it is important to avoid collateral damage to brain tissue during treatments of that organ. The methods also can be applied to treat a number of other of cancers, including liver cancer, prostate cancer, and pancreatic adenocarcinoma.
Viewed differently, the method for treating aberrant cell growth in animals can be considered a method of treating an animal (including humans) having an aberrant cell growth or mass in or on a tissue or an organ. In exemplary embodiments, the organ is a brain, and the aberrant cell mass is a benign or malignant tumor. Under this view, the method can be a method of treating an animal suffering from a disease or disorder resulting from aberrant cell growth by reducing or eliminating some or all of a mass (e.g., tumor) produced by the aberrant cell growth.
To effect the methods according to the invention, the present invention provides devices designed to treat aberrant cell masses using irreversible electroporation (IRE). While IRE devices have been disclosed prior to the priority date of this document, advanced surgical tools for in vivo IRE to treat diseased tissues and organs had not been developed. The present invention, for the first time, provides devices suitable for in vivo IRE treatment of diseases and disorders, particularly those associated with abnormal cell growth in or on a tissue or organ, which allow for minimally invasive treatment of patients suffering from such abnormal cell growth. The present inventors have designed microsurgical tools to treat currently inoperable tumors in humans and other animals through IRE, and in particular brain tumors. While not so limited, the designs provided herein are sufficient to ablate the majority of tumors smaller than about 3 cm in diameter, such as those about 14 cc in volume or less.
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate several embodiments of the invention, and together with the written description, serve to explain certain principles of the invention.
Reference will now be made in detail to various exemplary embodiments of the invention. It is to be understood that the following discussion of exemplary embodiments is not intended as a limitation on the invention, as broadly disclosed above. Rather, the following discussion is provided to give the reader a more detailed understanding of certain aspects and features of the invention.
Before embodiments of the present invention are described in detail, it is to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting. Further, where a range of values is provided, it is understood that each intervening value, to the tenth of the unit of the lower limit, unless the context clearly dictates otherwise, between the upper and lower limits of that range is also specifically disclosed. Each smaller range between any stated value or intervening value in a stated range and any other stated or intervening value in that stated range is encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range, and each range where either, neither, or both limits are included in the smaller ranges is also encompassed within the invention, subject to any specifically excluded limit in the stated range. Where the stated range includes one or both of the limits, ranges excluding either or both of those included limits are also included in the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the term belongs. Although any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention, the preferred methods and materials are now described. All publications mentioned herein are incorporated herein by reference to disclose and describe the methods and/or materials in connection with which the publications are cited. The present disclosure is controlling to the extent it conflicts with any incorporated publication.
As used herein and in the appended claims, the singular forms “a”, “an”, and “the” include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to “a pulse” includes a plurality of such pulses and reference to “the sample” includes reference to one or more samples and equivalents thereof known to those skilled in the art, and so forth. Furthermore, the use of terms that can be described using equivalent terms include the use of those equivalent terms. Thus, for example, the use of the term “patient” is to be understood to include the terms “subject”, “animal”, “human”, and other terms used in the art to indicate one who is subject to a medical treatment.
Electroporation is the phenomenon in which permeability of the cell membrane to ions and macromolecules is increased by exposing the cell to short (microsecond to millisecond) high voltage electric pulses. The application of the electric pulses can have no effect, can have a transient effect known as reversible electroporation, or can cause permanent permeation known as irreversible electroporation (IRE), which leads to non-thermal cell death by necrosis.
Davalos, Mir, and Rubinsky (Davalos, R. V. et al., 2005, “Tissue ablation with irreversible electroporation.” Annals of Biomedical Engineering. 3(2):223-231) recently postulated and demonstrated that IRE can be used as an independent drug-free tissue ablation modality for particular use in cancer therapy. This minimally invasive procedure involves placing electrodes into or around the targeted area to deliver a series of short and intense electric pulses to induce the irreversible structural changes in the membranes. To achieve IRE, the electric field in the targeted region needs to be above a critical value, which is dependent on a variety of conditions such as tissue type and pulse parameters.
The present invention extends and improves on prior techniques for IRE by providing new methods and devices for IRE treatment of solid tumors, including those associated with brain cancer. Because the brain is susceptible to small fluctuations in temperature, the present invention provides devices and techniques for non-thermal IRE to kill undesirable cells and tissues. In addition, because the brain functions by way of electrical charges, the present invention provides devices and techniques that limit or precisely control the amount of electrical charge delivered to tissue. To achieve the invention, a device has been developed that contains both conducting and non-conducting surfaces and that is capable of delivering controlled pulses of electricity to tumor tissues while substantially protecting surrounding healthy tissue. In exemplary embodiments, the device has a laminate structure of at least one electrically conductive and at least one electrically insulative material. In some exemplary embodiments, the device has at least two concentric disk electrodes separated by an insulating material similar in dimensions to those already used in deep brain stimulation (DBS). DBS is an FDA approved therapy that alleviates the symptoms of otherwise treatment-resistant disorders, such as chronic pain, Parkinson's disease, tremor, and dystonia. The Examples, below, present results demonstrating that an IRE procedure does not induce substantial thermal effects in the brain, and delivers electrical charges to highly defined regions of tissues, supporting the conclusion that IRE can be used as a minimally invasive surgical technique for the treatment of brain cancer and other diseases and disorders involving aberrant cell mass development. The methods employ the unique designs discussed herein, which provide improved controlled delivery of electrical pulses with controlled three-dimensional patterns and controlled thermal outputs. The present devices and systems provide surgical tools and methods for IRE treatment of subcutaneous tumors that expand the application space for this new technology, with the potential to treat a number of cancers, including brain, liver, prostate and pancreatic adenocarcinoma.
The following detailed description focuses on devices, systems, and methods for treatment of brain cancer. However, those of skill in the art will recognize that the concepts discussed have equivalent application to other diseases and disorders involving aberrant cell growth and/or production of deleterious cell masses on organs and tissues.
While the prognosis for many patients has improved with new drugs and radiosurgery, options to treat primary brain tumor patients are limited because of the need for techniques to be non-thermal, i.e., not propagate a convective hot spot in normal brain tissue not being treated. The current invention allows for IRE as an extremely useful, minimally invasive surgical technique for the treatment of brain cancer. The present designs for a surgical tool/treatment system for brain cancer is readily translated into the development of tools for other types of cancer.
As mentioned above, the present invention provides a method for treating aberrant cell growth in animals. The aberrant cell growth can be any type of aberrant cell growth, but in exemplary embodiments detailed herein, it is generally described in terms of tumors, such as brain tumors. In general, the method of treating comprises temporarily implanting one or more electrodes, which may be present on the same or different devices, into or immediately adjacent a tumor, and applying an electrical field to the tumor in multiple pulses or bursts over a prescribed or predetermined period of time to cause irreversible cell death to some or all of the tumor cells. Preferably, irreversible damage to non-tumor cells in proximity to the tumor is minimal and does not result in significant or long-lasting damage to healthy tissues or organs (or a significant number of cells of those tissues or organs). According to the method of the invention, cell killing is predominantly, essentially, or completely due to non-thermal effects of the electrical pulsing. The method further comprises removing the electrode(s) after suitable treatment with the electrical fields. As a general matter, because the method involves temporary implantation of relatively small electrodes, it is minimally invasive and does not result in the need for significant post-treatment procedures or care. Likewise, it does not result in significant ancillary or collateral damage to the subject being treated.
In practicing the method, the number of electrodes, either on a single or multiple devices, used can be selected by the practitioner based on the size and shape of the tumor to be treated and the size and shape of the electrode. Thus, embodiments of the invention include the use of one, two, three, four, five, or more electrodes. Each electrode can be independently sized, shaped, and positioned in or adjacent the tumor to be treated. In addition, the number and spacing of electrodes on a single device can be adjusted as desired. As detailed below, the location, shape, and size of electrodes can be selected to produce three-dimensional killing zones of numerous shapes and sizes, allowing for non-thermal treatment of tumors of varying shapes and sizes.
Surprisingly, it has been found that pulse durations for ablation of solid tumors can be relatively short, thus reducing the probability of generation of thermal conditions and excessive charges that cause collateral damage to healthy tissues. More specifically, the present invention recognizes for the first time that, in contrast to prior disclosures relating to IRE, the pulse length for highly efficient tissue ablation can be lower than 100 microseconds (100 us). Indeed, it has surprisingly been determined that a pulse length of 25 us or lower can successfully cause non-thermal cell death. Thus, in embodiments, the method of treatment uses pulse lengths of 10 us, 15 us, 20 us, 25 us, 30 us, 35 us, 40 us, 45 us, 50 us, 55 us, 60 us, 65 us, 70 us, 75 us, 80 us, 85 us, or 90 us. Preferably, to most effectively minimize peripheral damage due to heat, pulse lengths are limited to 90 us or less, for example 50 us or less, such as 25 us. By reducing the pulse length, as compared to prior art techniques for IRE, larger electric fields can be applied to the treatment area while avoiding thermal damage to non-target tissue (as well as to target tissue). As a result of the decreased pulse length and concomitant reduction in heat production, the methods of the invention allow for treatment of tissues having higher volumes (e.g., larger tumors) than possible if prior art methods were to be employed for in vivo treatment of tumors.
It has also been determined that voltages traditionally used for IRE are too high for beneficial treatment of tumors in situ. For example, typically, IRE is performed using voltages of between 4000 V/cm to 1500 V/cm. The present invention provides for use of voltages of much lower power. For example, the present methods can be performed using less than 1500 V/cm. Experiments performed by the inventors have shown that 2000 V/cm can cause excessive edema and stroke in patients when applied to brain tissue. Advantageously, for treatment of brain tumors, applied fields of about 500 V/cm to 1000 V/cm are used. Thus, in general for treatment of brain tumors, applied fields of less than 1000 V/cm can be used.
Further, it has been discovered that the number of electrical pulses that can be applied to successfully treat tumors can be quite high. Prior art methods of using IRE for various purposes included the use of relatively few pulses, for example 8 pulses or so. Reports of use of up to 80 pulses for IRE have been published; however, to the inventors' knowledge, a higher number of pulses has not been recommended. The present invention provides for the use of a relatively high number of pulses, on the order of 90 pulses or greater. For example, in exemplary embodiments, 90 pulses are used. Other embodiments include the use of more than 90 pulses, such as 100 pulses, 110 pulses, or more.
According to the method of the invention, cycle times for pulses are set generally about 1 Hz. Furthermore, it has been found that alternating polarity of adjacent electrodes minimizes charge build up and provides a more uniform treatment zone. More specifically, in experiments performed by the inventors, a superficial focal ablative IRE lesion was created in the cranial aspect of the temporal lobe (ectosylvian gyrus) using the NanoKnifeB (Angiodynamics, Queensbury, NY) generator, blunt tip bipolar electrode (Angiodynamics, No. 204002XX) by delivering 9 sets of ten 50 us pulses (voltage-to-distance ratio 2000 V/cm) with alternating polarity between the sets to prevent charge build-up on the stainless steel electrode surfaces. Any such electroporation power supply can be used, including a Cliniporator™ (Igea, Carpi, Italy) or a GHT 1287 (Jouan, St Herblain, France). These parameters were determined from ex-vivo experiments on canine brain and they ensured that the charge delivered during the procedure was lower than the charge delivered to the human brain during electroconvulsive therapy (an FDA approved treatment for major depression). Excessive charge delivery to the brain can induce memory loss, and thus is preferably avoided.
The method of the invention encompasses the use of multiple electrodes and different voltages applied for each electrode to precisely control the three-dimensional shape of the electric field for tissue ablation. More specifically, it has been found that varying the amount of electrical energy emitted by different electrodes placed in a tissue to be treated allows the practitioner to finely tune the three-dimensional shape of the electrical field that irreversibly disrupts cell membranes, causing cell death. Likewise, the polarity of electrodes can be varied to achieve different three-dimensional electrical fields. Furthermore, one of the advantages of embodiments of the invention is to generate electric field distributions that match complex tumor shapes by manipulating the potentials of multiple electrodes. In these embodiments, multiple electrodes are energized with different potential combinations, as opposed to an “on/off” system like radio frequency ablation, to maximize tumor treatment and minimize damage to surrounding healthy tissue.
According to the method of the invention, the separation of the electrodes within or about the tissue to be treated can be varied to provide a desired result. For example, the distance between two or more electrodes can be varied to achieve different three-dimensional electrical fields for irreversible disruption of cell membranes. The three-dimensional shape can thus be set to ablate diseased tissue, but partially or completely avoid healthy tissue in situations where the interface between healthy and diseased tissue shows a complex three dimensional shape.
The methods of the invention are well suited for treatment of tumors using non-thermal IRE. To better ensure that cell ablation is a result of non-thermal effect, and to better protect healthy tissue surrounding the site of treatment, the method can further comprise cooling the electrodes during the treatment process. By applying a heat sink, such as a cooling element in an electrode (discussed below), generation of heat in and around tissue in close proximity to the electrodes can be minimized, resulting in a more consistent application of non-thermal IRE to the tissue and a more controlled application of cell killing to only those tissues desired to be treated.
The method of the invention, in embodiments, includes the use of electrodes of different sizes and shapes. Studies performed by the inventors have shown that the electrical field distribution may be altered by use of electrodes having different diameters, lengths, and shapes. Thus, the use of different sizes and shapes of conducting surfaces can be used to control the electrical fields used for cell ablation. In certain embodiments, the method includes the use of a variable size electrode. For example, an electrode may be used that, in one configuration has a relatively small diameter, which is used for minimally invasive implantation of the electrode into the site to be treated. Once inserted, a sheath or other covering can be retracted to allow expansion of the electrode tip to a different size for application of the electric field. After treatment, the sheath can be moved to cover the tip again, thus reducing the size of the tip to its original size, and the electrode withdrawn from the treated tissue. The expandable element can be thought of as a balloon structure, which can have varying diameters and shapes, depending on original material shape and size.
The methods of the invention comprise, in embodiments, treatment of tissue surrounding tumor tissue. The surrounding tissue is treated by way of reversible electroporation. As such, bioactive agents can be introduced into the reversibly electroporated cells. In such embodiments, additional cell killing, under controlled conditions, can be effected in healthy tissue. Such a treatment is preferred when treating highly aggressive malignant tumors, which often show invasion of healthy tissue surrounding the tumor. Alternatively, the bioactive agents can provide a protective effect to cells in which they are introduced via reversible electroporation.
In embodiments, the method for treating aberrant cell growth in animals is a method of treating a subject suffering from a tumor. It thus may be a method of treating a subject suffering from cancer. Using different terminology, the method can be a method of treating a tumor or a method of treating cancer. As such, the method can be a method of treating either a benign tumor or a malignant tumor. In embodiments, the method is best suited for treatment of solid tumors. In exemplary embodiments, the method is a method of treating a subject suffering from a brain tumor, such as brain cancer.
In clinical settings, the method of treating according to the invention can have ameliorative effects or curative effects. That is, a method of treating a subject can provide a reduction in cell growth of a tumor, a reduction in tumor size, or total ablation of the tumor.
The method of the invention can include a single round of treatment or two or more rounds of treatment. That is, the method of cell ablation, either intentionally or as a result of tumor size or shape, can result in less than complete destruction of a tumor. In such a situation, the method can be repeated one or more times to effect the desired level of tumor reduction. As the method of the invention is relatively minimally invasive, multiple rounds of treatment are not as harmful to the patient than multiple rounds of traditional surgical intervention.
The method of the invention can be part of a multi-modal treatment. The method thus may comprise other cell-killing techniques known in the art. For example, the method may further comprise exposing the tumor to radiation, or treating the patient with a chemotherapeutic agent. It likewise may be performed after or between surgical intervention to remove all or part of a tumor. Those of skill in the art are fully aware of the parameters for treatment with other modalities; thus, details of those treatment regimens need not be detailed herein.
The method of the invention is implemented using devices and systems. The devices according to the invention are suitable for minimally invasive temporary implantation into a patient, emission of a tissue-ablating level of electricity, and removal from the patient. The device according to the invention thus may be used in the treatment of tumors and the treatment of patients suffering from tumors. The devices can take multiple forms, based on the desired three-dimensional shape of the electrical field for cell killing. However, in general, the devices include two or more regions of differing conductivity. In some embodiments, the device comprises alternating regions of conductivity, for example a region of electrical conductivity, which is adjacent a region of electrical non-conductivity, which is adjacent a different region of conductivity. In embodiments, the device comprises two or more layers of conductive and insulative materials, in a laminate structure with alternating conductive properties. To protect tissue that is not to be treated, the outer layer can be insulative except at the region where treatment is to be effected. According to embodiments of the device, the amount of conductive material exposed to the tissue to be treated can be adjusted by a movable non-conductive element disposed on the outer surface of the device.
Further, in general, the device takes a rod-like shape, with one dimension (i.e., length) being substantially longer than the other (i.e., width or diameter). While exemplary embodiments are configured in a generally cylindrical shape, it is to be understood that the cross-sectional shape of the electrode can take any suitable geometric shape. It thus may be circular, square, rectangular, oval, elliptical, triangular, pentagonal, hexagonal, octagonal, etc.
The devices of the invention comprise one or more electrodes, which are electrically conductive portions of the device. The devices are thus electrically conductive elements suitable for temporary implantation into living tissue that are capable of delivering an electrical pulse to the living tissue. The device of the invention has a proximal end and a distal end. The proximal end is defined as the end at which the device is attached to one or more other elements, for control of the function of the device. The distal end is defined by the end that contacts target tissue and delivers electrical pulses to the tissue. The distal end thus comprises an exposed or exposable electrically conductive material for implantation into a target tissue. Typically, the distal end is described as including a “tip” to denote the region of the distal end from which an electrical pulse is delivered to a tissue. The device further comprises at least one surface defining the length and circumference of the device.
In exemplary embodiments, the device comprises a laminate structure, with alternating conductive and non-conductive or insulative layers expanding outward from the proximal-distal center axis to the surface of the device. In typical embodiments, the center most layer, which shows the smallest diameter or width, is electrically conductive and comprises a part of the electrode tip. However, in alternative embodiments, the center-most layer is an open channel through which a fluid may be passed or through which additional physical elements may be placed. Yet again, the center-most layer may comprise an insulative material. In embodiments comprising a laminate structure, the structure can provide a more customizable electric field distribution by varying the separation distances between electrically conductive regions. Alternatively, in embodiments, certain electrically conductive regions can be exposed or concealed by movement of an outer, non-conductive sheath. In embodiments that do not comprise a laminate structure, the separation lengths can be achieved by disposing on the surface non-conductive materials at various regions.
In some embodiments, one or more substantially open channels are disposed along the center axis or in place of one of the conductive or insulative layers. The channel(s) may be used as heat sinks for heat produced by the device during use. In embodiments, water or another fluid is held or entrained in the channel to absorb and/or remove heat.
The device of the invention comprises an electrode tip at the distal end. The electrode tip functions to deliver electrical pulses to target tissue. The tip may be represented by a single conductive layer of the device or may be represented by two or more conductive layers that are exposed to the tissue to be treated. Furthermore, the tip may be designed to have any number of geometrical shapes. Exemplary embodiments include tips having a needle-like shape (i.e., electrical pulses emanate from a small cone-like structure at the distal end of the device) or having a circular shape (i.e., electrical pulses emanate from the cylindrical outer surface of the device, which is a section of the device where the outer insulative layer has been removed to expose the next layer, which is conductive). For use in treatment of brain tumors, the tip advantageously comprises a blunt or rounded end to minimize laceration of brain tissue. In embodiments, the rounded or blunt end comprises a hole that allows for a sharp or needle-like structure to be deployed into tumor tissue at the appropriate time.
The device comprises a proximal end, which generally functions for attachment of the device to a power source/controller and a handle. The proximal end thus may comprise connections for electrical wires that run from the power source/controller to the electrically conductive layers of the device. Standard electrical connections may be used to connect the conductive elements to the wires. In embodiments, the device is attached to a handle for case of use by a human. While not limited in the means for attaching the device to the handle, in embodiments, the connection is made by way of a friction fit between the outer surface of the device and the handle, for example by way of an insulative O-ring (e.g., a Norprene O-ring) on the handle. In other embodiments, the device comprises, on its outer surface, ridges or other surface features that mate with surface features present on the handle. In yet other embodiments, the proximal end comprises one or more structures that allow for controlled movement of the outer surface along the length of the device. In such embodiments, the outer surface will comprise an outer sheath that is electrically non-conductive, and which surrounds an electrically conductive layer. Using the structures at the proximal end, the outer sheath may be moved, relative to the rest of the device, to expose or conceal varying portions of the electrically conductive material beneath it. In this way, the amount of surface area of the conductive material at the tip can be adjusted to provide a desired height of exposure of tissue to the electrode tip. Of course, other structures for securely fastening the device to a holder may be used, such as clips, set screws, pins, and the like. The device is not limited by the type of structure used to connect the device to the holder.
The device of the invention can be designed to have any desired size. Typically, it is designed to be minimally invasive yet at the same time suitable for delivery of an effective electrical field for IRE. The diameter or width is thus on the order of 0.5 mm to 1 cm. Preferably, the diameter or width is about 0.5 mm to about 5 mm, such as about 1 mm, 2 mm, 3 mm, or 4 mm. The length of the device is not particularly limited, but is generally set such that a surgeon can use the device comfortably to treat tumors at any position in the body. Thus, for human use, the device is typically on the order of 40 cm or less in length, such as about 30 cm, 25 cm, or 15 cm, whereas for veterinary use, the length can be much larger, depending on the size of animal to be treated. For treatment of human brain tumors, the length can be on the order of 40 cm.
In some embodiments, the device, or a portion of it, is flexible. A flexible device is advantageous for use in accessing tumors non-invasively or minimally invasively through natural body cavities. In embodiments where the device or a portion of it is flexible, the shape of the device can change based on contact with body tissues, can be pre-set, or can be altered in real-time through use of wires or other control elements, as known in the art, for example in use with laparoscopic instruments.
The device of the invention can be part of a system. In addition to the device, the system can comprise a handle into or onto which the device is disposed. The handle can take any of a number of shapes, but is generally designed to allow a surgeon to use the device of the invention to treat a patient in need. It thus typically has a connector for connecting the device to the holder, and a structure for the surgeon to grasp and maneuver the device. The handle further can comprise a trigger or other mechanism that allows the surgeon to control delivery of electrical pulses to the device, and thus to the tissue to be treated. The trigger can be a simple on/off switch or can comprise a variable control that allows for control of the amount of power to be delivered to the device. Additionally, the handle may be created in such a manner that it may be attached to additional pieces of equipment, such as ones that allow precise placement of the electrode relative to an inertial or the patient's frame of reference, allowing steady and accurate electrode positioning throughout an entire procedure, which may entail the application of electric pulses in addition to radiotherapy, imaging, and injections (systemically and locally) of bioactive agents. Furthermore, the handle may be attached to machines that are operated remotely by practitioners (e.g., the Da Vinci machine).
The system can further comprise a power source and/or a power control unit. In embodiments, the power source and control unit are the same object. The power source provides electrical power to the device, typically by way of an electrical connection through the handle. The power source can be any suitable source that can deliver the proper amount of electrical power to the device of the invention. Suitable power sources are commercially available, and the invention is not limited by the type or manufacturer. The power control unit provides the user with the ability to set the power output and pulse time for electrical pulses to be delivered to the device, and thus to the tissue to be treated. Suitable control units are commercially available, and the invention is not limited by the type or manufacturer. For example, an appropriate power source/controller is available from Angiodynamics (Queensbury, NY).
The device of the invention can be disposable or reusable. Where the device is designed to be reusable, it is preferably fabricated from materials that can be sterilized multiple times without destruction of the device. For example, the device can be fabricated from rust-resistant metals or alloys, such as stainless steel, and plastic or other synthetic polymeric materials that can withstand cleaning and sterilization. Exemplary materials are those that can be subjected to detergents, steam heat (e.g., autoclaving), and/or irradiation for at least one cycle of sterilization. Those of skill in the art can select the appropriate materials without undue experimentation, based on materials used in other medical devices designed to withstand common sterilization techniques.
The invention will be further explained by the following Examples, which are intended to be purely exemplary of the invention, and should not be considered as limiting the invention in any way.
As a general background to the Examples, it is noted that the inventors and their colleagues have successfully demonstrated decellularization using IRE 1) in vivo and ex vivo, 2) to show that different tissues can be utilized, 3) to show that the area affected can be predicted using numerical modeling, 4) to show how numerical modeling can be used to ensure the ECM, blood vessels, and neural tubes are not thermally damaged, 5) while the organ was attached to a perfusion system, 6) while demonstrating preservation of major vasculature and ECM, and 7) with verification through imaging.
To illustrate 1) the possibility to monitor creation of a cell-free tissue section in brain in real-time using imaging techniques, 2) the variety of tissues that can be used, and 3) how to preserve vasculature, a healthy female purpose bred beagle was used. Nine sets of ten pulses were delivered with alternating polarity between the sets to minimize charge build-up on the electrode surfaces. The maximum voltage-to-distance ratio used was 2000 V/cm because the resulting current did not exceed 2 amps. The charge that was delivered to the brain during the IRE procedure was 22.5 mC, assuming ninety pulses (50 us pulse durations) that would result from a maximum hypothetical current of 5 amps.
Method: After induction of general anesthesia, a routine parietotemporal craniectomy defect was created to expose the right temporal lobe of the brain. Two decellularization sites were performed: 1) a deep lesion within the caudal aspect of the temporal lobe using a monopolar electrode configuration (6 mm electrode insertion depth perpendicular to the surface of the target gyrus, with 5 mm interelectrode distance), and 2) a superficial lesion in the cranial aspect of the temporal lobe using a bipolar electrode (inserted 2 cm parallel to the rostrocaudal length of the target gyrus, and 2 mm below the external surface of the gyrus). Intraoperative adverse effects that were encountered included gross microhemorrhages around the sharp monopolar electrode needles following insertion into the gyrus. This hemorrhage was controlled with topical application of hemostatic foam. Subject motion was completely obliterated prior to ablating the superficial site by escalating the dose of atracurium to 0.4 mg/kg. Grossly visible brain edema and surface blanching of the gyrus overlying the bipolar electrode decellularization site was apparent within 2 minutes of completion of IRE at this site. This edema resolved completely following intravenous administration of 1.0 g/kg of 20% mannitol. No adverse clinically apparent effects attributable to the IRE procedure, or significant deterioration in neurologic disability or coma scale scores from baseline evaluations were observed. However, the results indicated to the inventors that a lower voltage would provide adequate results but with less ancillary trauma to the brain.
Methods to monitor creation of cell-free tissues in vivo: A unique advantage of IRE to ablate tissues in vivo is its ability to be monitored in real-time using imaging techniques, such as electrical impedance tomography, MRI, and ultrasound. Below, this Example shows MRI examinations performed immediate post-operatively, which demonstrate that IRE decellularization zones were sharply demareated (
As shown in
Macrolevel and histologic verification of treating cells: The brain was collected within 2 hours of the time of death and removed from the cranium. Care was taken to inspect soft tissues and areas of closure created at the time of surgery. The brain was placed in 10% neutral buffered formalin solution for a minimum of 48 hours. Then, the brain was sectioned at 3 mm intervals across the short axis of the brain, in order to preserve symmetry and to compare lesions. Following gross dissection of fixed tissues, photographs were taken of brain sections in order to document the position and character of lesions, as shown in
Microscopic lesions correlated well with macroscale appearance. Areas of treatment are represented by foci of malacia and dissociation of white and grey matter. Small perivascular hemorrhages are present and there is sparing of major blood vessels (see
Analysis to determine IRE threshold: To determine the electric field needed to irreversibly electroporate tissue, one can correlate the lesion size that was observed in the ultrasound and MRI images with that in the histopathological analysis to determine the percentage of lesion growth. Decellularized site volumes can be determined after identification and demareation of IRE decellularization zones from surrounding brain tissue using hand-drawn regions of interest (ROI). A representative source sample image is provided in
There are advantages to a strategy to treat cancer using IRE. IRE to treat cancer has advantages over existing thermal ablation, including the ability to: monitor what area has been irreversibly electroporated in real-time using ultra-sound or other imaging techniques; spare neural tubes and blood vessels, enabling treatment in otherwise inoperable areas; preserve the microvasculature, which promotes rapid healing of the treated volume; predict the affected area using numerical modeling for designing protocols; not be affected by blood flow as is the temperature distribution during thermal therapies; image the success of the treatment using MRI or other imaging techniques; and administer the electric fields in time periods of less than 5 minutes.
The present methods and devices provide a technology for treatment of tumors with IRE. Prior to the present invention, devices designed to irreversibly electroporate deep tissues did not exist. The experiments conducted and reported in the prior art utilized reversible electroporation systems. These devices usually consist of large plate electrodes (intended for transdermal drug delivery), needle electrodes with a large probe (intended for targeting in or for small animal studies), or cuvettes (used for in vitro applications). Applying an electric pulse over the skin presents challenges for deep tissue applications due to the significant voltage drop across the skin, generating considerable skin damage. (The same issue arises with an organ containing an epithelial layer.) Other devices that use needle electrodes are limited to superficial tumors. Furthermore, these tools have a large mechanical housing making the treatment of subcutaneous tumors impossible without invasive surgery. A tool designed specifically for IRE for subcutaneous delivery of the electric field dramatically enhances the application space of IRE for tissue ablation.
To provide an initial proof of concept, a device according to the invention was used to kill brain cells in vitro. Representing a unique pathobiological phenomenon, high-grade canine gliomas exhibit essentially the same properties as human gliomas, including pathology (markers), genetics, behavior (invasiveness), lack of metastases, and a similar clinical course of the disease. Dogs diagnosed with these tumors have poor prognosis and most are humanely euthanized to prevent further suffering from the progression of the disease. Primary brain tumors (PBTs) account for 1-3% of all deaths in aged dogs where necropsy is performed. The many similarities of glial tumors in people and dogs make these tumors in dogs an excellent translational approach for new diagnostic and treatment methods.
As shown in
The present invention provides simple and elegant minimally invasive microsurgical tools to treat currently inoperable tumors in humans and animals through IRE. Exemplary designs are shown in
The size and shape of the IRE area is dictated by the voltage applied and the electrode configuration and is readily predictable through numerical modeling. Therefore, different surgical tips can be fashioned to achieve the same therapeutic result. For example, tip 710 can comprises retractable conductive spikes 713 emanating from a blunt end tip 710 and disposed, when deployed, at an acute angle to tip 710 (see
The devices can comprise interchangeable surgical tips, allowing for versatility in creating a device well suited for different tissues or different sized or shaped tumors. Varying electrode diameters (varied in part by selection of the type and length of deployable spikes) and separation distances will be sufficient to ablate the majority of tumors about or smaller than 3 cm by selecting the appropriate voltages to match different tumor sizes and shapes. As shown in later figures, some of the embodiments of the device comprise an element at the tip to introduce anti-cancer drugs for ECT, cytotoxic proteins, or other bioactive agents into the targeted area.
While not depicted in detail, embodiments of the device comprise durable carbon coatings over portions of the device that act both to insulate normal tissue and to increase the efficiency of IRE pulsing.
With general reference to
Turning now to
As shown in the cut-away depiction in Panel B, device tip 810 has multiple alternating layers of conducting 820 and non-conducting 830 materials surrounding an non-conducting inner core 831. In Panel B, the top and bottom conducting regions 820 are energized electrodes while the middle conducting region 820 is a ground electrode. The present invention provides the conducting and non-conducting (insulative) regions in varying lengths to fine tune electrical field generation. More specifically, using imaging techniques directed at the tumor to be treated, a surgeon can determine what type of electrical field is best suited for the tumor size and shape. The device can comprise one or more movable elements on the surface of the tip (not depicted) or can be designed such that one or more of the alternating conducting 820 or non-conducting 830 elements is movable. Through movement and setting of the outer element(s) or inner elements 820 or 830, the surgeon can configure the device to deliver a three-dimensional electrical killing field to suit the needs of the particular situation.
In addition to changing charges, adapting the physical dimensions of the probe also allows flexibility in tailoring the treatment area to match the dimensions of the tumor. By altering the electrode parameters, including diameter, length, separation distance, and type, it is possible to conveniently tailor the treatment to affect only specific, targeted regions. In addition, developing an electrode capable of altering and adapting to these dimensional demands greatly enhances its usability and adaptability to treatment region demands.
Many IRE treatments may involve coupled procedures, incorporating several discrete aspects during the same treatment. One embodiment of the invention provides a device with a needle-like tip 910 with an incorporated hollow needle 990 with either an end outlet 991 (shown in Panel A) or mixed dispersion regions 961 (shown in Panel B). Such a configuration allows for highly accurate distribution of injectable solutions, including those comprising bioactive agents. Use of such a device limits the dose of treatment required as well as ensures the correct placement of the materials prior to, during, and/or after the treatment. Some of the possible treatment enhancers that would benefit from this technology are: single or multi-walled carbon nanotubes (CNTs); chemotherapeutic agents; conductive gels to homogenize the electric field; antibiotics; anti-inflammatories; anaesthetics; muscle relaxers; nerve relaxers; or any other substance of interest.
The schematics in
Irreversible Electroporation (IRE), a new minimally invasive technique we invented to treat tumors, can be enhanced using carbon nanotubes (CNTs). The technique can be used on a variety of tumors including liver, prostate, pancreatic adenocarcinoma and renal carcinoma. Focal ablation techniques, such as IRE, however, are not selective and thus cannot distinguish between healthy and cancerous cells. To overcome this limitation, nanoparticles can be incorporated into IRE therapy. Nanomaterials offer a potential means for energy focusing, because they present a toolset with a unique size range closely matching that of cells (1 to 1,000 nm), and substantial multi-functional capability. Some embodiments of nanoparticles exhibit a “lightning rod” effect when exposed to electric fields, amplifying the field at the nanoparticle's tip, thereby producing a significantly larger electric potential compared to its surroundings and reducing the possibility of sub-lethal joule heating. This localized amplification of electric fields could thus be used as a means to induce IRE from relatively small electric fields; residual adverse effects to surrounding tissue would subsequently be reduced. Targeting of nanoparticles through tumor specific antibodies to the desired tissue region will allow treatment up to and beyond the tumor margin using IRE, and offer the opportunity to lower the IRE applied field, thereby minimizing damage to surrounding, non-cancerous tissue during treatment. Integration of CNTs into IRE could more selectively localize the electric field and thermal profile to cancer cells through antibody targeting and more precisely control the induction of cell death and HSP expression.
When carbon nanotubes (CNTs) are immersed in an electric field, an induced dipole is generated that tends to align the axis of the CNT parallel to the electric field. Taking advantage of these effects can be used to reduce cell damage during treatment. For example, two sets of electric fields delivered subsequent to and at right angles to each other is a technique that can be used to align the CNTs and electroporate the cells. Under some circumstances, cells electroporated using CNTs may result in cells having a higher vitality than when electroporated without the use of CNTs. The use of CNTs injected into a region of tissue, with or without targeting antibodies, to mediate IRE for tumor ablation is another method covered by the present invention.
In N-TIRE therapy, the local electric field distribution dictates the treatment area. When electric field parameters are optimized, N-TIRE possesses a clear therapeutic advantage in that there is no induction of thermal injury in the ablated area, thereby preserving important tissue components such as the extracellular matrix, major blood vessels, myelin sheaths, and nerves. Since N-TIRE is a focal ablation technique, it does not selectively kill infiltrative cancer cells with the potential for re-growth and metastasis beyond the tumor margin without affecting the surrounding healthy cells. The ablation area can be enlarged without inducing joule heating and the selectivity of N-TIRE can be enhanced through the use of CNTs. Localized amplification of electric fields from CNTs could induce N-TIRE in adjacent cells from relatively small electric fields, without affecting healthy surrounding cells. Further, antibody targeting of CNTs to tumor cells could permit localized CNT-mediated electric field amplification at selected tumor cell membranes causing targeted cell death due to permanent membrane destabilization. Even further, it is advantageous to incorporate CNTs into N-TIRE protocols in order to simultaneously lower the voltage for N-TIRE and expand the treatable area.
Combinatorial CNT-mediated N-TIRE cancer therapies can include treatment of a number of cancers including prostate, liver, kidney, and pancreatic. Breast cancer is a particularly apt application since this combinatorial therapy can directly address the need of scar reduction and mitigate the likelihood of metastasis, which have proven in some circumstances to be helpful for improved treatment. Adapting N-TIRE treatments for breast carcinomas has several unique challenges. Among these are the diverse and dynamic physical and electrical properties of breast tissue. The fatty and connective tissues within the breast region surrounding a tumor have low water content, and thus significantly reduced electrical conductivity and permittivity than tumors. It has been shown that N-TIRE treatment area is highly predictable based on electric field distribution. CNTs will provide a means to raise the electric field magnitude within the tumor and increase N-TIRE treatment area in localized breast carcinomas.
Selective destruction of tumor cells with CNT-mediated N-TIRE therapy is dependent upon targeting CNTs to the tumor cells of interest. In physiological conditions, cells uptake folic acid across the plasma membrane using the folate carrier to supply the folate requirements of most normal cells. In contrast, folate receptor (FR), a high affinity membrane folate-binding protein, is frequently overexpressed in a wide variety of cancer cells. Since it is generally either absent or present at only low levels in most normal cells, the FR has been identified as not only a marker of cancers but also a potential and attractive target for tumor-specific drug delivery. Thus, bioconjugated nanoparticles, such as those conjugated with folic acid (FA-NP), can be synthesized and used as drug delivery tools for administering drugs into cancer cells.
In embodiments, the device comprises a cooling system within the electrode to reduce the highly localized temperature changes that occur from Joule heating. During the electric pulses for IRE, the highest quantity of heat generation is at the electrode-tissue interface. By actively cooling (for example, via water flow) the electrode during the procedure, these effects are minimized. Further, cooling provides a heat sink for the nearby tissue, further reducing thermal effects. This allows more flexibility in treating larger tissue regions with IRE while keeping thermal effects negligible, providing a greater advantage for IRE over conventional thermal techniques. Cooling can be achieved by placement of one or more hollow chambers within the body of the device. The cooling chambers can be closed or open. Open chambers can be attached at the proximal end to fluid pumping elements to allow for circulation of the fluid (e.g., water) through the device during use.
In embodiments, the device comprises an outer protector that is designed to be movable up and down along the length of the device.
The invention provides a system for performing IRE tumor tissue ablation. As depicted in
In this embodiment, device 1100 comprises further elements for use. More specifically, device 1100 comprises a height adjustment apparatus 1151 at its proximal end to effect movement of outer sheath 1160. Outer sheath 1160 further comprises markings or scores 1168 on its surface to indicate amount of movement of outer sheath 1160 after implantation of device 1100 into tumor tissue.
The invention provides a system for accurately controlling the distances between multiple electrodes of singular or multiple polarities during a charge. The device places electrode types within an adjustable part of a handle that may be maneuvered by a surgeon or attached to a harness system, as described above. The adjustable portion of the handle may be used to control the relative depths of penetration as well as separation distances of each electrode relative to one or more additional electrodes placed within the system.
The system and method of the invention can include the use of multiple devices for treatment of tumors. The devices can be implanted in the tumor at varying distances from each other to achieve desired cell killing. Alternatively, the system and method can include the use of a single device having multiple electrodes along its tip. Modeling of placement of multiple devices or a single device with multiple electrodes in tissue was performed, and exemplary electrical fields generated are depicted in
Numerical models representing two needles and an axis symmetric needle electrode configuration have been developed to compare the increase in treatment area shown by the electric field distribution for the same thermal effects between 100 and 50 us pulse lengths. The area/volume of tissue that increased by at least 1 degree Kelvin was determined for a 100 us pulse. This area/volume was then used for the 50 us pulse to determine the electric field magnitude that would cause the same increase in temperature. A contour line has been created within these models to represent the region treated with the IRE threshold of 700V/cm. The results are shown in
To provide exquisite control of electrical fields, and thus cell killing, the size of the electrode tips may be adjusted. In addition to real-time electrode manipulation capabilities, integrating multiple electrode types within the same procedure can make a large impact on enhancing electric field distribution selectivity. This can be done by incorporating such variations as a needle electrode with a single probe or parallel needle electrodes with the conductive surface of one being a different dimension (e.g., longer) than the other. As shown in
We have discovered that a highly customizable electric field distribution may be attained by combining multiple electrode charges within the same pulse. This allows a highly customized and controllable treatment protocol to match the dimensions of the target tissue. In addition, the invasiveness of the treatment may be decreased by reducing the number of electrode placements required for treatment. In order to demonstrate the great flexibility in electric field distribution shape, 2-dimensional and axis symmetric models were developed with 3 and 4 electrode arrays along a single axis. The results are depicted in
We have done some preliminary studies and determined that the electric field distribution may be altered, and thus controlled, by changing the diameter and shape of the electrode between the conducting surfaces. This fact can be used to design and develop an electrode with an expandable/contractible interior and deformable exterior to change its size in real-time before or during a treatment to alter, and thus specify the electric field distribution in a manner that may be desirable during treatment. The ability to adjust this dimension in real-time is made additionally useful by the fact that a significantly smaller electrode may be inserted to keep it minimally invasive, and then expand the dimension once the electrode has reached the target tissue. In embodiments, the invention includes the use of a balloon between regions of charge that may be inflated/deflated during treatment to alter field distribution.
With the application of electric potentials, electrical forces may drive ions towards one electrode or the other. This may also lead to undesirable behavior such as electrolysis, separating water into its hydrogen and oxygen components, and leading to the formation of bubbles at the electrode-tissue interface. These effects are further exacerbated for multiple pulse applications. Such effects may cause interference with treatment by skewing electric field distributions and altering treatment outcomes in a relatively unpredictable manner. By altering the polarity between the electrodes for each pulse, these effects can be significantly reduced, enhancing treatment predictability, and thus, outcome. This alternating polarity may be a change in potential direction for each pulse, or occur within each pulse itself (switch each electrode's polarity for every pulse or go immediately from positive to negative potential within the pulse at each electrode).
Using a bipolar electrode with 4 embedded electrodes, one can use the middle two electrodes to inject a sinusoidal current (˜1-5 mA) that is low enough in magnitude to not generate electroporation and measure the voltage drop across the remaining two electrodes. From this setup one can calculate the impedance of the tissue and gather the conductivity of the tissue which is needed for treatment planning. One can do this analysis in a dynamic form after each electroporation pulse. Conductivity increases as a function of temperature and electroporation; therefore, for accurate treatment predictions and planning, the dynamic conductivity is needed and we can use the bipolar or unipolar electrodes to map the conductivity distribution before IRE treatment and during to adjust the pulse parameters.
According to the method, a tissue is exposed to an electrical field that is adequate in time and power to cause killing of cells of the tissue, but not adequate to significantly destroy the scaffolding upon and within which the cells exist. Furthermore, the electrical field does not cause irreversible tissue damage as a result of heating of the tissue. Various ways of providing such an electrical field are possible. General parameters follow; however, those of skill in the art are fully capable of devising alternative combinations to achieve the same end result without undue experimentation. In typical embodiments, one or more electrical pulses are applied to the tissue to cause cell membrane disruption as a result of the electricity and not substantially as a result of heat. Where two or more pulses are used, the pulses are separated by a period of time that allows, among other things, the tissue to cool so that thermal damage does not occur to a significant extent. For example, one or more electrical pulses can be applied to the tissue of interest for a duration in a range of from about 5 microseconds (μs) to about 62 seconds. For convenience, a short period of treatment might be desired. As such, in preferred embodiments, electrical pulses are applied for a period of about 1-10000 μs. Further, although there is no limit on the number of pulses to be delivered to the tissues, in preferred embodiments, from about 1 to about 100 pulses are applied to the tissue. For example, in an exemplary embodiment, about 10-1000 pulses of about 100 μs each in duration are applied to the tissue to cause cellular ablation.
The following are parameters that can be manipulated within the IRE treatments discussed herein.
The methods used to model tissue ablation are similar to the ones described by Edd and Davalos for predicting IRE areas based on the electric field and temperature distribution in the tissue (Edd, J. F, et al., 2007, “Mathematical modeling of irreversible electroporation for treatment planning.”, Technology in Cancer Research and Treatment., 6:275-286.) The methods are disclosed in Garcia et al., “Irreversible electroporation (IRE) to treat brain cancer.” ASME Summer Bioengineering Conference, Marco Island, FL, Jun. 25-29, 2008.
We have modeled a new electrode design for the application of IRE in brain tissue. According to our results, IRE can be an effective technique for minimally invasive brain tumor removal. The treatment does not induce substantial thermal effects in the brain, protecting the integrity of this organ, which is susceptible to small fluctuations in temperature.
In an embodiment of the method of the invention, the method includes delivering electrical signal(s) through tissue to determine its electrical properties before administering IRE by monitoring the voltage and current. Following from that, one may apply intermittent and post-IRE pulse(s), which can be used to determine the success of the procedure and adjust IRE pulse parameters.
Specific conductivity can be important for treatment planning of irreversible electroporation (IRE). For many applications, especially when treating tumors in the brain, the volume (area) of IRE must be predicted to maximize the ablation of the tumorous tissue while minimizing the damage to surrounding healthy tissue. The specific electrical conductivity of tissue during an irreversible electroporation (IRE) procedure allows the physicians to: determine the current threshold; minimize the electric current dose; decrease the Joule heating; and reduce damage to surrounding healthy tissue. To measure the specific conductivity of tissue prior to an IRE procedure the physician must: establish the electrode geometry (shape factor); determine the physical dimensions of the tissue; apply a small excitation AC voltage signal (1 to 10 mV); measure the AC current response; calculate the specific conductivity (o) using results from the prior steps. This procedure will not generate tissue damage (low amplitude AC signals) and will supply the physician (software) with the required information to optimize IRE treatment planning, especially in sensitive organs like the brain which is susceptible to high electrical currents and temperatures. Thus, the IRE procedure is well monitored and can also serve as a feedback system in between series of pulses and even after the treatment to evaluate the area of ablation.
Special Cases for electrode geometry:
Nomenclature (units in brackets):
Electrical conduction between a two-cylinder (needle) arrangement of length L in an infinite medium (tissue). It is important to note that this formulation is most accurate when L»R1, R2 and L»w. The electrical conductivity can be calculated from,
where the shape factor (S) corresponding to the electrode dimensions and configuration is given by,
The specific conductivity (σ) of the tissue can be calculated since the voltage signal (Ve) and the current responses (i) are known.
Explanation of electrical concepts: By using the bipolar electrode described in the priority document, one can apply a small excitation AC voltage signal (1 to 10 mV),
V(t)=V0 Sin(wt)
where V(t) is the potential at time t, V0 is the amplitude of the excitation signal and w is the frequency in radians/s. The reason for using a small excitation signal is to get a response that is pseudo-linear since in this manner we can determine the value for the impedance indicating the ability of a system (tissue) to resist the flow of electrical current. The measured AC current (response) that is generated by the excitation signal is described by
I(t)=I0 Sin(wt+q)
where I (t) is the response signal, I0 is the amplitude of the response (I01V0) and q is the phase shift of the signal. The impedance (Z) of the system (tissue) is described by,
Z=(V(t))/(I(t))=(V0 Sin(wt))/(I0 Sin(wt+q))=Z0(Sin(wt))/(Sin(wt+q))
It is important to note that the measurement of the response is at the same excitation frequency as the AC voltage signal to prevent interfering signals that could compromise the results. The magnitude of the impedance |Z0| is the electrical resistance of the tissue. The electrical resistivity (W m) can be determined from the resistance and the physical dimensions of the tissue in addition to the electrode geometry (shape factor). The reciprocal of the electrical resistivity is the electrical conductivity (S/m). Therefore, after deriving the electrical resistivity from the methods described above, the conductivity may be determined.
It will be apparent to those skilled in the art that various modifications and variations can be made in the practice of the present invention without departing from the scope or spirit of the invention. Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
The present application claims priority to and is a Continuation application of U.S. patent application Ser. No. 16/275,429, filed Feb. 14, 2019 (published as U.S. Patent Application Publication No. 2019/0175260 on Jun. 13, 2019 and which issued as U.S. Pat. No. 10,959,772 on Mar. 30, 2021), which is a Continuation application of U.S. patent application Ser. No. 14/627,046, filed Feb. 20, 2015 and published as U.S. Patent Application Publication No. 2015/0164584 on Jun. 18, 2015 (which issued as U.S. Pat. No. 10,245,105 on Apr. 2, 2019). The '046 application claims priority to and is a Continuation application of U.S. patent application Ser. No. 12/491,151, filed Jun. 24, 2009 and published as U.S. Patent Application Publication No. 2010/0030211 on Feb. 4, 2010 and issued as U.S. Pat. No. 8,992,517 on Mar. 31, 2015. The '151 application claims priority to and the benefit of the filing dates of U.S. provisional patent application No. 61/171,564, filed Apr. 22, 2009, U.S. provisional patent application No. 61/167,997, filed Apr. 9, 2009, and U.S. provisional patent application No. 61/075,216, filed Jun. 24, 2008. The '151 application is a Continuation-In-Part application of U.S. patent application Ser. No. 12/432,295, filed Apr. 29, 2009 and published as U.S. Patent Application Publication No. 2009/0269317 on Oct. 29, 2009 and issued as U.S. Pat. No. 9,598,691 on Mar. 21, 2017. The '295 application claims priority to and the benefit of the filing date of U.S. provisional patent application No. 61/125,840, filed Apr. 29, 2008. The entire disclosure of each of these patent applications is hereby incorporated herein by reference.
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| Number | Date | Country | |
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| 20210186600 A1 | Jun 2021 | US |
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| 61171564 | Apr 2009 | US | |
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| 61075216 | Jun 2008 | US | |
| 61125840 | Apr 2008 | US |
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| Child | 16275429 | US | |
| Parent | 12491151 | Jun 2009 | US |
| Child | 14627046 | US |
| Number | Date | Country | |
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| Parent | 12432295 | Apr 2009 | US |
| Child | 12491151 | US |
