US20080071323A1 - Methods and Systems Employing Intracranial Electrodes for Neurostimulation and/or Electroencephalography - Google Patents
Methods and Systems Employing Intracranial Electrodes for Neurostimulation and/or Electroencephalography Download PDFInfo
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- US20080071323A1 US20080071323A1 US11/944,259 US94425907A US2008071323A1 US 20080071323 A1 US20080071323 A1 US 20080071323A1 US 94425907 A US94425907 A US 94425907A US 2008071323 A1 US2008071323 A1 US 2008071323A1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/02—Details
- A61N1/04—Electrodes
- A61N1/05—Electrodes for implantation or insertion into the body, e.g. heart electrode
- A61N1/0526—Head electrodes
- A61N1/0529—Electrodes for brain stimulation
- A61N1/0531—Brain cortex electrodes
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/02—Details
- A61N1/04—Electrodes
- A61N1/05—Electrodes for implantation or insertion into the body, e.g. heart electrode
- A61N1/0526—Head electrodes
- A61N1/0529—Electrodes for brain stimulation
- A61N1/0534—Electrodes for deep brain stimulation
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/02—Details
- A61N1/04—Electrodes
- A61N1/05—Electrodes for implantation or insertion into the body, e.g. heart electrode
- A61N1/0526—Head electrodes
- A61N1/0529—Electrodes for brain stimulation
- A61N1/0539—Anchoring of brain electrode systems, e.g. within burr hole
Abstract
Aspects of the invention relate to intracranial electrodes and methods for implanting and using intracranial electrodes. In one particular example, an intracranial electrode includes a shaft having a distal contact surface adapted to electrically contact a surface of a patient's brain, a head associated with the shaft, and threads adapted to fix the electrode with respect to the patient's skull. This electrode may have an adjustable length adapted to change a contact force of the distal contact surface against the surface of the brain by adjusting the length of the electrode.
Description
- The present invention relates to intracranial electrodes and methods for implanting and using intracranial electrodes. These electrodes and methods are particularly well suited for neurostimulation systems and may also be used in electroencephalography and other recording systems, e.g., evoked potential recordings.
- A wide variety of mental and physical processes are known to be controlled or influenced by neural activity in the central and peripheral nervous systems. For example, the neural functions in some areas of the brain (e.g., the sensory or motor cortices) are organized according to physical or cognitive functions. Several other areas of the brain also appear to have distinct functions in most individuals. In the majority of people, for example, the areas of the occipital lobes relate to vision, the regions of the left inferior frontal lobes relate to language, and the regions of the cerebral cortex appear to be involved with conscious awareness, memory, and intellect. Because of the location-specific functional organization of the brain, in which neurons at discrete locations are statistically likely to control particular mental or physical functions in normal individuals, stimulating neurons at selected locations of the central nervous system can be used to effectuate changes in cognitive and/or motor functions throughout the body.
- In several existing applications, neural functions are treated or augmented by electrical or magnetic stimulation powered by a neural stimulator that has a plurality of therapy electrodes and a pulse system coupled to the therapy electrodes. The therapy electrodes can be implanted into the patient at a target site for stimulating the desired portions of the brain. For example, one existing technique for masking pain in a patient is to apply an electrical stimulus to a target stimulation site of the brain. In other applications, stimulation of an appropriate target site in the brain has shown promise for treating damage to and disease and disorders of the brain, including damage from strokes and treatment of Alzheimer's disease, depression, obsessive-compulsive behavior, and other disorders.
- The brain can be stimulated in several known fashions. One type of treatment is referred to as transcranial electrical stimulation (TES), which involves placing an electrode on the exterior of the patient's scalp and delivering an electrical current to the brain through the scalp and the skull. TES, however, is not widely used because the delivery of the electrical stimulation through the scalp and the skull causes patients a great amount of pain and the electrical field is difficult to direct or focus accurately.
- Another type of treatment is transcranial magnetic stimulation (TMS), which involves using a high-powered magnetic field adjacent the exterior of the scalp over an area of the cortex. TMS does not cause the painful side effects of TES. Unfortunately, TMS is not presently effective for treating many patients because the existing delivery systems are not practical for applying stimulation over an adequate period of time. TMS systems, for example, are relatively complex and require stimulation treatments to be performed by a healthcare professional in a hospital or physician's office. The efficacy of TMS in longer-term therapies may be limited because it is difficult to (a) accurately localize the region of stimulation in a reproducible manner, (b) hold the device in the correct position over the cranium for the requisite period, and (c) provide stimulation for extended periods of time.
- Another device for stimulating a region of the brain is disclosed by King in U.S. Pat. No. 5,713,922, the entirety of which is incorporated herein by reference. King discloses a device for cortical surface stimulation having electrodes mounted on a paddle that is implanted under the skull of the patient. These electrodes are placed in contact with the surface of the cortex to create “paresthesia,” which is a vibrating or buzzing sensation. Implanting the paddle typically requires removal of a relatively large (e.g., thumbnail-sized or larger) window in the skull via a full craniotomy. Craniotomies are performed under a general anesthetic and subject the patient to increased chances of infection.
- A physician may employ electroencephalography (EEG) to monitor neural functions of a patient. Sometimes this is done alone, e.g., in diagnosing epileptic conditions, though it may also be used in conjunction with neurostimulation. Most commonly, electroencephalography involves monitoring electrical activity of the brain, manifested as potential differences at the scalp surfaces, using electrodes placed on the scalp. The electrodes are typically coupled to an electroencephalograph to generate an electroencephalogram. Diagnosis of some neurological diseases and disorders, e.g., epilepsy, may best be conducted by monitoring neural function over an extended period of time. For this reason, ambulatory electroencephalography (AEEG) monitoring is becoming more popular. In AEEG applications, disc electrodes are applied to the patient's scalp. The scalp with the attached electrodes may be wrapped in gauze and the lead wires attached to the electrodes may be taped to the patient's scalp to minimize the chance of displacement.
- EEG conducted with scalp-positioned electrodes requires amplification of the signals detected by the electrodes. In some circumstances, it can be difficult to pinpoint the origin of a particular signal because of the signal dissipation attributable to the scalp and the skull. For more precise determinations, EEG may be conducted using “deep brain” electrodes. Such electrodes extend through the patient's scalp and skull to a target location within the patient's brain. Typically, these deep brain electrodes comprise lengths of relatively thin wire that are advanced through a bore through the patient's skull to the desired location. If the electrodes are to be monitored over an extended period of time, the electrodes typically are allowed to extend out of the patient's skull and scalp and are coupled to the electroencephalograph using leads clipped or otherwise attached to the electrodes outside the scalp. To avoid shifting of the electrodes over time, the electrodes typically are taped down or held in place with a biocompatible cementitious material. The patient's head typically must be wrapped in gauze to protect the exposed electrodes and the associated leads, and the patient is uncomfortable during the procedure. This may be suitable for limited testing purposes-deep brain encephalography typically is limited to tests conducted in hospital settings over a limited period of time, usually no more than a few days—but could be problematic for longer-term monitoring, particularly in nonclinical settings.
- Screws have been used to attach plates or the like to patients' skulls.
FIG. 1 , for example, schematically illustrates a conventional cranial reconstruction to repair afracture 50 or other trauma. In this application, aplate 60 is attached to theouter cortex 12 of theskull 10 bycortical bone screws 62. Theplate 60 spans thefracture 50, helping fix the skull in place on opposite sides of thefracture 50. As can be seen inFIG. 1 , thescrews 62 do not extend through the entire thickness of the skull. Instead, thescrews 62 are seated in theouter cortex 12 and do not extend into thecancellous 18 or theinter cortex 14. In some related applications, thescrews 62 may be longer and extend into or even through thecancellous 18. Physicians typically take significant care to ensure that thescrews 62 do not extend through the entire thickness of the skull, though, because penetrating the skull can increase the likelihood of trauma to or infection in the patient's brain. -
FIG. 1 is a schematic illustration of a conventional cranial reconstruction. -
FIG. 2A is a schematic view in partial cross section of an intracranial electrode in accordance with one embodiment of the invention implanted in a patient. -
FIG. 2B is a schematic top elevation view of the implanted intracranial electrode ofFIG. 2A . -
FIG. 3A is a schematic illustration in partial cross section of an intracranial electrode in accordance with another embodiment of the invention implanted in a patient. -
FIG. 3B is a schematic top elevation view of the implanted intracranial electrode ofFIG. 3A . -
FIG. 4A is a schematic illustration in partial cross section of an intracranial electrode in accordance with yet another embodiment of the invention implanted in a patient. -
FIG. 4B is a side view of a dielectric member of the electrode ofFIG. 4A . -
FIG. 5 is a schematic illustration in partial cross section of an intracranial electrode in accordance with still another embodiment of the invention implanted in a patient. -
FIG. 6A is a schematic illustration in partial cross section of an intracranial electrode in accordance with a further embodiment of the invention implanted in a patient. -
FIG. 6B is a schematic top elevation view of the implanted intracranial electrode ofFIG. 6A . -
FIG. 7 is a schematic illustration in partial cross section of an intracranial electrode in accordance with still another embodiment of the invention implanted in a patient. -
FIG. 8 is a schematic side view of a broken-away portion of a patient's skull in which an intracranial electrode in accordance with another embodiment of the invention has been implanted. -
FIG. 9 is a schematic partial cross-sectional view taken along line 9-9 ofFIG. 8 . -
FIG. 10 is an isolation view of a portion of the implanted electrode ofFIG. 9 . -
FIG. 11 is a perspective view of selected components of the intracranial electrode ofFIGS. 8-10 . -
FIG. 12 is a schematic illustration in partial cross section of an intracranial electrode in accordance with yet another embodiment of the invention implanted in a patient. -
FIG. 13 is a schematic illustration in partial cross section of an intracranial electrode in accordance with one more embodiment of the invention implanted in a patient. -
FIG. 14 is a schematic illustration in partial cross section of an intracranial electrode in accordance with a further embodiment of the invention implanted in a patient. -
FIG. 15 is a schematic partial cross-sectional view of the intracranial electrode ofFIG. 13 with a retaining collar of the electrode in a radially compressed state. -
FIG. 16 is a schematic partial cross-sectional view of the intracranial electrode ofFIG. 14 with the retaining collar in a radially expanded state. -
FIG. 17 is a schematic illustration in partial cross section of a deep brain intracranial electrode in accordance with an alternative embodiment of the invention implanted in a patient. -
FIG. 18 is a schematic illustration in partial cross section of a deep brain intracranial electrode in accordance with still another embodiment of the invention implanted in a patient. -
FIG. 19 is a schematic overview of a neurostimulation system in accordance with a further embodiment of the invention. -
FIG. 20 is a schematic overview of a neurostimulation system in accordance with another embodiment of the invention. -
FIG. 21 is a schematic illustration of one pulse system suitable for use in the neurostimulation system ofFIG. 17 orFIG. 18 . -
FIG. 22 is a schematic top view of the array of electrodes inFIG. 17 . -
FIGS. 23-26 are schematic top views of alternative electrode arrays in accordance with other embodiments of the invention. - A. Overview
- Various embodiments of the present invention provide intracranial electrodes and methods for implanting and using intracranial electrodes. It will be appreciated that several of the details set forth below are provided to describe the following embodiments in a manner sufficient to enable a person skilled in the art to make and use the disclosed embodiments. Several of the details and advantages described below, however, may not be necessary to practice certain embodiments of the invention. Additionally, the invention can also include additional embodiments that are not described in detail with respect to
FIGS. 1-24 . - One embodiment of the invention provides an intracranial electrode that includes a shaft, a head, and threads. The shaft includes a distal contact surface adapted to electrically contact a surface of a patient's brain. The head is associated with the shaft and is sized to be positioned subcutaneously adjacent the patient's skull. This can ameliorate the difficulties associated with electrodes that protrude through the patient's scalp, including irritation of the skin and discomfort. The threads are carried by at least one of the head and the shaft and may be adapted to fix the electrode with respect to the patient's skull. This intracranial electrode has an adjustable length adapted to change a contact force of the distal contact surface against the surface of the brain by adjusting the length of the electrode. In one adaptation of this embodiment, the intracranial electrode includes an adjustment means that is adapted to adjust the length of the electrode.
- Another embodiment of the invention provides an intracranial electrode that includes an electrically conductive member, a dielectric member, and an anchor. The electrically conductive member has a blunt contact surface and the dielectric member has an interior in which the electrically conductive member is received. The anchor may be carried by the electrically conductive member or the dielectric member. The anchor is adapted to anchor at least one of the electrically conductive member and the dielectric member with respect to a patient's skull adjacent a brain surface such that the contact surface of the electrically conductive member is in electrical contact with the brain surface and the dielectric member electrically insulates the skull from the electrically conductive member.
- Another embodiment of the invention provides a neurostimulator system. This neurostimulator system includes an intracranial electrode, a lead, and a pulse system. The intracranial electrode may take the form of one of the preceding embodiments. In one particular implementation, the intracranial electrode includes a shaft including a distal contact surface adapted to electrically contact a surface of a patient's brain; a head associated with the shaft, with the head being sized to be positioned subcutaneously adjacent the patient's skull; and threads carried by at least one of the head and the shaft, with the threads being adapted to fix the electrode with respect to the patient's skull. The lead is adapted to be subcutaneously implanted beneath the patient's scalp. The lead has a first portion, which is adapted to be electrically coupled to the contact surface, and an electrically insulated implantable length. The pulse system is adapted to be implanted in the patient's body at a location spaced from the electrode. The pulse system is operatively coupled to the electrode via the lead to deliver an electrical stimulus to the brain via the electrode. If so desired, an array of such intracranial electrodes may be employed and the pulse system may be adapted to generate an electrical potential between the electrodes in the array.
- A method of implanting an intracranial electrode in accordance with another embodiment of the invention involves advancing a threaded electrode through a patient's skull until a contact surface of the electrode is in atraumatic contact with a surface of the patient's brain. The threaded electrode is electrically coupled to a lead. A head of the electrode and the length of the lead are covered with the patient's scalp, thereby enclosing the electrode. An electrical stimulus is delivered to the patient's brain via the electrode. This electrical stimulus may be generated by a pulse system electrically coupled to the electrode by the lead. In one adaptation of this embodiment, the method may also include adjusting a length of the electrode, e.g., to adjust the force of the contact surface of the electrode against the surface of the brain.
- For ease of understanding, the following discussion is subdivided into three areas of emphasis. The first section discusses certain intracranial electrodes; the second section relates to select embodiments of neurostimulation systems; and the third section outlines methods in accordance with other embodiments of the invention.
- B. Intracranial Electrodes
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FIGS. 2-15 illustrate intracranial electrodes in accordance with various embodiments of the invention. Like reference numbers are used throughout these figures to designate like or analogous elements. - FIGS. 2A-B illustrate an
intracranial electrode 100 in accordance with one embodiment of the invention. Thiselectrode 100 includes ahead 102 attached to a threadedshaft 110. Thehead 102 andshaft 110 may be integrally formed of an electrically conductive material, e.g., titanium or another biocompatible, electrical conductive metal. Thehead 102 may include one ormore slots 104, an allen head recess (not shown), or other structure (e.g., a square drive or TORX™ drive recess) adapted to facilitate turning theelectrode 100. As theelectrode 100 is turned, thethreads 112 of the threadedshaft 110 will advance a generally distally positionedcontact surface 115 of theelectrode 100 toward thedura mater 20. The length of theshaft 110 may be selected so that thecontact surface 115 of theelectrode 100 electrically engages the surface of thedura mater 20 without causing undue harm to thedura mater 20 or the underlying cerebral cortex. Thecontact surface 115 may comprise a relatively blunt end to reduce trauma to the dura mater and theunderlying brain tissue 25. - In one embodiment, the
intracranial electrode 100 is adapted to be electrically connected to a pulse system (1050 inFIG. 18 , for example), as described below. Theelectrode 100 may be connected to the pulse system in any desired fashion. In the illustrated embodiment, theelectrode 100 is coupled to such a pulse system by means of anelectrical lead 120. Theelectrical lead 120 shown inFIGS. 2A and 2B comprises an elongated, subcutaneouslyimplantable body 124, which may have an insulative sheath. An electrically conductive ring orwasher 122 may be attached to an end of thebody 124. In one embodiment, an opposite end of thebody 124 is physically attached to a component of the pulse system. In other embodiments, the leads may be operatively connected to one or more components of the pulse system without being physically attached thereto, e.g., using a transmitter and antenna or a magnetic coupling. Embodiments of pulse systems incorporating such wireless links are disclosed in U.S. Patent Application Publication No. US 2002/0087201, the entirety of which is incorporated herein by reference. - The
head 102 of theelectrode 100 is adapted to be implanted subcutaneously beneath the patient's scalp 30 (shown schematically inFIG. 2A ). As explained below, theelectrode 100 may be used to deliver an electrical signal to thebrain tissue 25 adjacent thecontact surface 115. At higher stimulus levels, electrical contact between the patient'sscalp 30 and thehead 102 of theelectrode 100 may be uncomfortable for the patient. If so desired, thescalp 30 may be electrically insulated from thehead 102. This may be accomplished by applying on the head 102 a quantity of a dielectric, biocompatible, cementitious material (not shown), which may be cured or dried in place. In another embodiment, thehead 102 may be covered with a separate cap 130 (shown in dashed lines inFIG. 2A ) formed of a dielectric material, e.g., a dielectric, biocompatible plastic, that may be glued, press-fit, or otherwise attached to thehead 102 and/or thelead 120. - The dimensions of the
electrode 100 can be varied to meet various design objectives. In one embodiment, however, theelectrode 100 is longer than the thickness of the patient's skull. More specifically, thehead 102 is adapted to be seated at an extracranial subcutaneous site while the threadedshaft 110 is only slightly longer than the skull thickness at the intended treatment site. Lengths on the order of 4-50 mm, for example, may be appropriate in certain applications. The diameter of thehead 102 and the threadedshaft 110 may also be varied. For most applications,shafts 110 having diameters (typically excluding the width of the threads 112) of no greater than 4 mm will suffice. Shaft diameters of about 1-4 mm are likely, with diameters of 1.5-2.5 mm being well suited for most applications. FIGS. 2A-B illustrate anelectrode 100 having aconstant diameter shaft 110, but it should be understood that the shaft diameter may vary. For example, theshaft 110 may taper distally to improve the ability of theshaft 110 to be self-tapping. Thehead 102 typically will have a larger diameter than an adjoining portion of theshaft 110. (It should be recognized thatFIGS. 2-15 are not drawn to scale. In particular, the aspect ratio of the electrodes is significantly reduced to better illustrate certain functional aspects of the designs.) -
FIG. 3A illustrates anintracranial electrode 150 in accordance with another embodiment of the invention. Thisintracranial electrode 150 is similar in many respects to theintracranial electrode 100 of FIGS. 2A-B. For example, theelectrode 150 includes an electrically conductive threadedshaft 110 defining a blunt,atraumatic contact surface 115 adjacent a distal end. - The connection of the
electrode 150 to thelead 160 in FIGS. 3A-B differs somewhat from the connection of theelectrode 100 and lead 120 in FIGS. 2A-B, however. In FIGS. 2A-B, theelectrode 100 is electrically coupled to thelead 120 by compressively engaging the electricallyconductive ring 122 of thelead 120 between theelectrode head 102 and theskull 10. In FIGS. 3A-B, theelectrode 150 includes ahead 152 includingslots 154 or other structure for engaging a screwdriver, wrench, or the like. Thehead 152 is adapted to engage acap 162 carried by thelead 160 that electrically couples thebody 164 of thelead 160 to thehead 152 of theelectrode 150. In the illustrated embodiment, thecap 162 comprises a dielectric body (e.g., a dielectric plastic material with some resilience) having an electrically conductiveinner surface 163, which may be provided by coating an interior surface of thecap 162 with a metal. In one embodiment, thecap 162 is adapted to resiliently deform to be press-fitted on thehead 152. Thebody 164 of thelead 160 may be coupled to the electrically conductiveinner surface 163 of thecap 162, thereby providing an electrical pathway between theelectrode 150 and a pulse system (not shown) operatively coupled to thelead 160. - In one embodiment, the
cap 162 is sized to be subcutaneously implanted beneath the patient'sscalp 30. In the illustrated embodiment, thehead 152 and thecap 162 both extend outwardly beyond theouter cortex 12 of the patient'sskull 10. In another embodiment (not shown) some or all of the length of thehead 152 and/or thecap 162 may be countersunk into a recess formed through theouter cortex 12 and/or an outer portion of the cancellous 18. This can improve patient comfort, which can be useful if theintracranial electrode 150 is intended to be implanted permanently or for an extended period of time. - FIGS. 4A-B schematically illustrate aspects of an
intracranial electrode 200 in accordance with another embodiment. Theelectrode 200 may comprise an electrically conductiveinner portion 205 and an electrically insulativeouter portion 206. In the illustrated embodiment, the electricallyconductive portion 205 of theelectrode 200 includes ahead 202 and a threadedshaft 210 defining acontact surface 215 for electrically contacting the patient'sdura mater 20. These elements of theelectrode 200 and their electrical connection to thelead 120 are directly analogous to theelectrode 100 shown in FIGS. 2A-B. The electrically insulativeouter portion 206 of theelectrode 200 shown inFIG. 4A comprises adielectric member 240 that is disposed between the threadedshaft 210 and the patient'sskull 10. As shown inFIG. 4B , thisdielectric member 240 may take the form of a tapered sleeve. Thesleeve 240 may have an upper ring-like portion 242 and a plurality ofdeformable flanges 244 extending distally therefrom. Theflanges 244 may be adapted to be urged outwardly into compressive contact with a bore formed in the patient'sskull 10 when the threadedshaft 210 is advanced into the interior of thesleeve 240. Although not shown inFIG. 4B , ribs or teeth may be provided on the exterior surfaces of theflanges 244 to further anchor thesleeve 240 in the cancellous 18. In one embodiment, thesleeve 240 is formed of a dielectric plastic and the threads of the threadedmember 210 may be self-tapping in the inner wall of thesleeve 240. - When implanted in a
skull 10 as shown inFIG. 4A , thedielectric sleeve 240 will electrically insulate theskull 10 from the electricallyconductive shaft 210 of theelectrode 200. (Thesleeve 240 need not completely electrically isolate the skull andshaft 210; it merely serves to reduce electrical conduction to theskull 10.) As explained below, some embodiments of the invention employ an array comprising a plurality of intracranial electrodes implanted at various locations in a patient'sskull 10. The use of a dielectric member such as thedielectric sleeve 240 can help electrically isolate each of theelectrodes 200 fromother electrodes 200 in the array (not shown). If so desired, theelectrode 200 may be provided with adielectric cap 230 sized and shaped to be implanted subcutaneously beneath the patient's scalp 30 (not shown inFIG. 4A ). Much like thecap 130 ofFIG. 2A , thiscap 230 may electrically insulate the patient's scalp from the electricallyconductive head 202. This may further improve electrical isolation of theelectrodes 200 in an array. -
FIG. 5 illustrates anintracranial electrode 250 in accordance with yet another embodiment of the invention. Thiselectrode 250 includes an electricallyconductive shaft 260 electrically coupled to a subcutaneouslyimplantable head 262 and a distally positionedcontact surface 265. Theshaft 260 is received in the interior of an externally threaded dielectric layer 280. Theshaft 260 may be operatively coupled to the dielectric layer 280 for rotation therewith as the electrode is threadedly advanced through the patient'sskull 10. In one embodiment, this may be accomplished by a spline connection between theshaft 260 and the dielectric layer 280. In other embodiments, the dielectric layer 280 may be molded or otherwise formed about theshaft 260. - In one particular embodiment, the dielectric layer 280 comprises an electrically insulative ceramic material. In another embodiment, the dielectric layer 280 comprises an electrically insulative plastic or other biocompatible polymer that has sufficient structural integrity to adequately anchor the
electrode 250 to theskull 10 for the duration of its intended use. If so desired, the dielectric layer 280 may be porous or textured to promote osseointegration of long-term implants. For shorter-term applications, the dielectric layer 280 may be formed of or covered with a material that will limit osseointegration. - In each of the preceding embodiments, the
intracranial electrode head 102 and thecontact surface 115 remains fixed. When the threadedshaft 110 is sunk into theskull 10 to a depth sufficient to compress theconductive ring 122 of thelead 120 between thehead 102 and theskull 10, this will also fix the distance from the exterior surface of theouter cortex 12 of theskull 10 to thecontact surface 115. The thickness of theskull 10 can vary from patient to patient and from site to site on a given patient's skull. Hence, the pressure exerted by thecontact surface 115 against thedura mater 20 will vary depending on the thickness of the skull. If theelectrode 100 is selected to be long enough to make adequate electrical contact with the dura mater adjacent the thickest site on a skull, the pressure exerted by thecontact surface 115 against thedura mater 20 may cause undue damage at sites where the skull is thinner. Consequently, it can be advantageous to provide a selection of electrode sizes from which the physician can choose in selecting anelectrode 100 for a particular site of a specific patient's skull. -
FIGS. 6-12 illustrate embodiments of electrodes with adjustable lengths. FIGS. 6A-B, for example, illustrate anintracranial electrode 300 that is adapted to adjust a distance between the outer surface of theskull 10 and acontact surface 315 of theelectrode 300. This, in turn, enables the contact force between thecontact surface 315 and the surface of thedura mater 20 to be varied without requiring multiple electrode lengths. - The
intracranial electrode 300 ofFIGS. 6A and 6B includes a probe orshaft 310 that has a blunt distal surface defining thecontact surface 315 of theelectrode 300. Theshaft 310 has aproximal end 312 that may include atorque drive recess 314 or the like to facilitate rotation of theshaft 310 relative to ahead 320 of theelectrode 300. At least a portion of the length of theshaft 310 is externally threaded. In the illustrated embodiment, the shaft has an externally threaded proximal length and an unthreaded surface along a distal length. - The
head 320 of theelectrode 300 comprises abody 322 and atubular length 324 that extends from thebody 322. Thebody 322 may be adapted to be rotated by hand or by an installation tool. In one embodiment thebody 322 is generally hexagonal to facilitate rotation with an appropriately sized wrench. In the particular embodiment shown in FIGS. 6A-B, thebody 322 has a pair ofrecesses 323 in its outer face sized and shaped to interface with a dedicated installation tool (not shown) having projections adapted to fit in therecesses 323. If so desired, the installation tool may be a torque wrench or other tool adapted to limit the amount of torque an operator may apply to thehead 320 of theelectrode 300 during installation. Thetubular length 324 may be externally threaded so thehead 320 may be anchored to theskull 10 by screwing thetubular length 324 into theskull 10. - The
head 320 includes an internally threaded bore 326 that extends through the thickness of thebody 322 and thetubular length 324. Thebore 326 has threads sized to mate with the external threads on theshaft 310. If so desired, a biocompatible sealant (e.g., a length of polytetrafluoroethylene tape) may be provided between the threads of thebore 326 and the threads of theshaft 310 to limit passage of fluids or infectious agents through thebore 326. - Rotation of the
shaft 310 with respect to thehead 320 will, therefore, selectively advance or retract theshaft 310 with respect to thehead 320. This will, in turn, increase or decrease, respectively, the distance between thelower face 323 of thehead body 322 and thecontact surface 315 of theshaft 310. As suggested inFIG. 6A , this may be accomplished by inserting atip 344 of atorque driver 340 into thetorque drive recess 314 in theshaft 310 and rotating thetorque driver 340. Thetip 344 of thetorque driver 340 may be specifically designed to fit thetorque drive recess 314. In the embodiment shown in FIGS. 6A-B, thetorque drive recess 314 is generally triangular in shape and is adapted to receive atriangular tip 344 of thetorque driver 340. If so desired, thetorque driver 340 may comprise a torque wrench or the like that will limit the maximum torque and operator can apply to theshaft 310 of theelectrode 300. - If so desired, the
torque driver 340 may includegraduations 342 to inform the physician how far theshaft 310 has been advanced with respect to thehead 320. As noted below, in certain methods of the invention, the thickness of the skull at the particular treatment site may be gauged before theelectrode 300 is implanted. Using this information and thegraduations 342 on thetorque driver 340, the physician can fairly reliably select an appropriate length for theelectrode 300 to meet the conditions present at that particular site. - In the embodiment shown in FIGS. 6A-B, the
head 320 and theshaft 310 are both formed of an electrically conductive material. Theconductive ring 122 of thelead 120 may be received in a slot formed in thelower face 323 of thebody 322. Alternatively, thering 122 may be internally threaded, permitting it to be threaded over the external threads of thetubular length 324 before thehead 320 is implanted. If so desired, thering 122 can instead be compressively engaged by thelower face 323 of thehead 320 in a manner analogous to the engagement of thehead 102 with thering 122 inFIG. 2A , for example. - In another embodiment, the
head 320 is formed of a dielectric material, such as a dielectric ceramic or plastic. This may necessitate a different connection between the lead 120 and theshaft 310, such as by electrically contacting thelead 120 to theproximal end 312 of theshaft 310. Employing adielectric head 320 can help electrically insulate theskull 10 from theelectrodes 300, improving signal quality and reducing interference between thevarious electrodes 300 in an array, as noted above. -
FIG. 7 schematically illustrates anintracranial electrode 350 in accordance with a further embodiment of the invention. Theelectrode 350 includes a shaft or probe 360 having aproximal end 362 and a distally locatedcontact surface 365. Theshaft 360 may include a first threadedportion 360 a and a second threadedportion 360 c. In the embodiment shown inFIG. 7 , the first and second threadedportions intermediate portion 360 b. In an alternative embodiment, the two threadedportions - The
intracranial electrode 350 of this embodiment also includes ahead 370 having an internally threadedbore 376 extending through its thickness. The threads of thebore 376 are adapted to mate with the threads of the first threadedportion 360 a. By rotating theshaft 360 with respect to the head 370 (e.g., with a screwdriver 340), the distance between thehead 370 and thecontact surface 365 can be adjusted in much the same manner described above in connection with FIGS. 6A-B. - The
head 320 of theelectrode 300 in FIGS. 6A-B has an externally threadedtubular length 324 that extends into theskull 10 and helps anchor theelectrode 300 to theskull 10. Theshaft 310 may then move with respect to the skull by rotating theshaft 310 with respect to thehead 320. In the embodiment shown inFIG. 7 , thehead 370 is not directly anchored to theskull 10. Instead, the threads of the second threadedportion 360 c are adapted to threadedly engage theskull 10 to anchor theelectrode 350 with respect to theskull 10 and thehead 370 is attached to the first threadedportion 360 a of theshaft 360. In one embodiment, theshaft 360 may be threaded into a pilot hole in theskull 10. Once theshaft 360 is positioned at the desired depth, thehead 370 may be screwed onto the first threadedportion 360 a of theshaft 360 to help fix theshaft 360 with respect to the skull and provide a less traumatic surface to engage the patient's scalp (not shown) when the scalp is closed over theelectrode 350. In another embodiment, the length of theelectrode 350 may first be adjusted by rotating theshaft 360 with respect to thehead 370. Once theelectrode 350 has the desired length, theshaft 360 may be advanced into theskull 10. Theshaft 360 may be graduated to facilitate adjustment to the appropriate length. If so desired, the first threadedportion 360 a may be threaded in a direction opposite the second threadedportion 360 c and/or the pitch of the threads in the first threadedportion 360 a may be different from the pitch of the threads in the second threadedportion 360 c. - In the embodiment of
FIG. 7 , theshaft 360 of theelectrode 350 extends through thedura mater 20 and thecontact surface 365 of theelectrode 350 is in direct contact with the cerebral cortex of the patient's brain. This is simply intended to illustrate one alternative application. In other embodiments, the length of theelectrode 350 may be selected so that thecontact surface 365 electrically contacts thedura mater 20 without extending therethrough, much as illustrated inFIG. 6A , for example. -
FIGS. 8-11 illustrate anintracranial electrode 400 in accordance with another embodiment of the invention. Theintracranial electrode 400 includes a shaft or probe 410 that is slidably received by ahead 420. Theshaft 410 comprises an electrically conductive material and defines anelectrical contact surface 415, e.g., on its distal end. - In the preceding embodiments, some or a majority of the head of the electrode extends outwardly beyond the outer surface of the
skull 10. In the particular implementation shown inFIGS. 8-10 , thehead 420 is received entirely within the thickness of theskull 10. It should be understood, though, that this is not necessary for operation of the device, and this is shown simply to highlight that the position of thehead 420 with respect to theskull 10 can be varied. In another embodiment, at least a portion of thehead 420 extends outwardly beyond the outer surface of theskull 10. - The
head 420 includes abase 430 and anactuator 422. Thebase 430 includes an externally threadedbody 432 and atubular length 434 that extends from thebody 432. A portion of thetubular length 434 carriesexternal threads 436. Thetubular length 434 may also include one ormore locking tabs 440, each of which includes anactuating surface 442. - The
actuator 422 has an internally threaded bore 424 that is adapted to matingly engage thethreads 436 on thebase 430. Rotating theactuator 422 with respect to the base 430 in a first direction will advance theactuator 422 toward theactuating surface 442 of each of thetabs 440. Theactuator 422 may urge against the actuating surfaces 442, pushing thetabs 440 inwardly into engagement with theshaft 410. This will help lock theshaft 410 in place with respect to thebase 430. Rotating theactuator 422 in the opposite direction will allow thetabs 440 to resiliently return toward a rest position wherein they do not brake movement of theshaft 410. The force with which theshaft 410 engages the dura mater 20 (not shown) then can be adjusted to a desired level by moving theshaft 410 with respect to thebase 430. When theshaft 410 is in the desired position, theactuator 422 may be moved into engagement with thetabs 440 to hold theshaft 410 in the desired position. -
FIG. 12 illustrates an adjustable-lengthintracranial electrode 450 in accordance with another embodiment. Theintracranial electrode 450 includes an axially slidable probe orshaft 452 and ahead 460. Thehead 460 includes abody 462 and an externally threadedtubular length 464. Thetubular length 464 includes an axially extendingrecess 466 sized to slidably receive a portion of theshaft 452. An O-ring 465 or the like may provide a sliding seal between thehead 460 and theshaft 452. - The
contact surface 455 of theshaft 452 is pushed against the surface of thedura mater 20 with a predictable force by means of aspring 454 received in therecess 466. InFIG. 12 , thespring 454 is typified as a compressed coil spring formed of a helically wound wire or the like. In this embodiment, anelectrical contact 469 of thelead 468 may be electrically coupled to the wire of thespring 454. Electrical potential may then be conducted to theshaft 452 by the wire of thespring 454. - In another embodiment (not shown), the
spring 454 comprises a compressed elastomer, which may take the form of a column that fills some or all of the diameter of therecess 466. The elastomer may comprise a biocompatible polymeric material, for example. In such an embodiment, the elastomer may be electrically conductive, e.g., by filling a polymeric material with a suitable quantity of a conductive metal powder or the like. In another embodiment, one or more wires may be embedded in the elastomeric material to conduct an electrical signal across the elastomer to theshaft 452. - In the illustrated embodiment and the alternative embodiment wherein the
spring 454 comprises an elastomer, thehead 460 may be formed of a dielectric material, helping electrically insulate theskull 10 from theshaft 452. In an alternative embodiment, thehead 460 may be formed of an electrically conductive material. Even though the other structural elements of theelectrode 450 may remain largely the same, this would avoid the necessity of having thelead 468 extend through thehead 460; an electricallyconducive ring 122 or the like instead may be employed in a manner analogous to that shown inFIG. 6A , for example. -
FIG. 13 depicts and adjustable-lengthintracranial electrode 475 in accordance with a different embodiment. Some aspects of theintracranial electrode 475 are similar to theintracranial electrode 450 shown inFIG. 12 . In particular, theintracranial electrode 475 includes an axially slidable probe orshaft 480 that is slidably received in an axially extendingrecess 488 in atubular length 492 of ahead 490. A proximal face of thebody 490 may include a pair of tool-receivingrecesses 494, which may be analogous to the tool-receivingrecesses 323 noted above in connection withFIG. 6A , to aid in the installation of thebody 490. If so desired, one or more seals may be provided between theshaft 480 and thebody 490. In the embodiment shown inFIG. 13 , thebody 490 carries a first O-ring 493 and theshaft 480 and carries a second O-ring 484 sealed against the interior of therecess 488. These O-rings may also serve as abutments to limit axial travel of theshaft 480 in therecess 488. - The
contact surface 481 of theshaft 480 is pushed against the surface of thedura mater 20 with a predictable force by means of aspring 486. Thespring 486 may be substantially the same as thespring 454 shown inFIG. 12 , and the various materials suggested above for thespring 454 may also be employed in thespring 486 ofFIG. 13 . - In
FIG. 12 , thespring 454 provides the electrical connection between the lead 468 and theshaft 452. In the embodiment ofFIG. 13 , however, thelead 496 may be connected directly to theshaft 480 through alumen 495 in thebody 490. Thislumen 495 is sized to slidably receive a reduced-diameter neck 482 of theshaft 480. As thebody 490 is screwed into theskull 10 and moves toward thebrain 25, contact between theshaft 480 and thedura mater 20 will urge theshaft 480 upwardly, moving theneck 482 upwardly within thelumen 495. - The
electrode 475 ofFIG. 13 may facilitate delivering a highly reproducible contact force of thecontact surface 481 of theshaft 480 against thedura mater 20. The position of the reduced-diameter neck 482 of theshaft 480 within thelumen 495 will vary in a fixed relationship with the force exerted on thespring 486 by theshaft 480. Since the force of theshaft 480 against thespring 486 is essentially the same as the force of theshaft 480 against thedura mater 20, knowing the position of theneck 482 within thelumen 495 can give the operator an indication of the force exerted against thedura mater 20. In one particular embodiment, the interior of thelumen 495 may be graduated to mark off the depth of theneck 482 in thelumen 495. In another embodiment, thebody 490 may be driven into theskull 10 until the height of theneck 482 in thelumen 495 reaches a predetermined point, e.g., when the top of theneck 482 is flush with the top of thebody 490. -
FIG. 14 illustrates anintracranial electrode 500 in accordance with still another embodiment of the invention. Thiselectrode 500 includes an electrically conductive probe orshaft 510 having ahead 512 and acontact surface 515. A radiallycompressible retaining collar 540 extends along a portion of the length of theshaft 510. As shown inFIG. 15 , the retainingcollar 540 may be adapted to assume a radially reduced configuration in response to a compressive force, indicated schematically by the arrows F. This compressive force F may be generated by collapsing the retainingcollar 540 and restraining it in the lumen of an introducing sheath (not shown) sized to be received in a bore through theskull 10. When this force F is removed (e.g., by retracting the introducing sheath), the retainingcollar 540 may expand radially outwardly away from theshaft 510, as illustrated inFIG. 16 . - To implant the
electrode 500 in theskull 10, theshaft 510 may be advanced into a bore in the skull until thecontact surface 515 exerts the desired contact force against thedura mater 20. Once theshaft 510 is in the desired position, the compressive force F on thecollar 540 may be released, allowing thecollar 540 to expand outwardly into compressive engagement with the lumen of the bore in theskull 10. This will help hold theelectrode 500 in place with respect to the skull without requiring permanent anchoring of theshaft 510 to theskull 10. - The
shaft 510 may be electrically coupled to a pulse system (not shown) by alead 520. Thelead 520 may include acap 522 having an electrically conductiveinner surface 524 coupled to abody 526 of the lead. Thelead 520 may be analogous to thelead 160 shown in FIGS. 3A-B. Any other suitable electrical connection between theshaft 510 and the pulse system may be employed. - In one embodiment, the
collar 540 comprises a dielectric material. This will help electrically insulate theskull 10 from theshaft 510. In another embodiment, thecollar 540 is electrically conductive and thelead 520 may be electrically coupled to theshaft 510 via thecollar 540. - In the embodiment shown in
FIG. 14 , theshaft 510 may have a length only a little longer than the thickness of the patient'sskull 10 and thecontact surface 515 may be relatively blunt. Such a design is useful for relatively atraumatic contact with thedura mater 20. In another embodiment suggested in dashed lines inFIGS. 15 and 16 , theelectrode 500 may instead have a substantiallylonger shaft 510 a and a relativelysharp contact surface 515 a. Such an embodiment may be useful for directly stimulating a particular location within the cerebral cortex or some other location within the deeper tissues of the brain. -
FIG. 17 schematically illustrates how certain principles of the invention can be embodied in a deep brainintracranial electrode 550. Theelectrode 550 generally includes a threadedshaft 560 having ahead 562. Thehead 562 may be coupled to a pulse system or a sensing unit (as described below) via alead 160 in the same manner lead 160 is attached to thehead 152 ofelectrode 150 in FIGS. 3A-B. (Like reference numbers are used in these figures to indicate like elements.) Theelectrode 550 also includes an elongateconductive member 570 that extends inwardly from theskull 10 to a selectedtarget site 28. Theconductive member 570, which may comprise a length of a conductive wire, may be electrically shielded by a dielectric sheath along much of its length and have an exposed, electricallyconductive tip 574. - In use, the
conductive member 570 may be slid freely through a pilot hole 11 formed through the skull to position thetip 574 at thetarget site 28 in a known manner. The pilot hole 11 may be larger than theconductive member 570 or be tapped to receive the threads of theshaft 560. With theconductive member 570 in place, theshaft 560 may be threaded into the pilot hole 11, crimping theconductive member 570 against an interior of the pilot hole 11. This will fix theconductive member 570 in place. If so desired, aproximal length 572 of theconductive member 570 may extend outwardly of the skull and be held in place by thehead 562. The threads of the threadedshaft 560 may also cut through the dielectric sheath of theconductive member 570 as theshaft 560 is screwed into place, making electrical contact with the conductive wire therein. -
FIG. 18 schematically illustrates a deep brainintracranial electrode 600 in accordance with an alternative embodiment of the invention. Thiselectrode 600 includes ahead 610 having a threadedshaft 620 with an axially-extendingopening 622 extending through the length of thehead 610. Thehead 610 may also include a gimbal fitting 630 adapted to slidably receive a length of a conductive member, which may comprise the same type of elongateconductive member 570 discussed above in connection withFIG. 17 . - The gimbal fitting 630 is adapted to allow an operator greater control over the placement of the electrically
conductive tip 574 of theconductive member 570. In use, thetip 574 of theconductive member 570 will be threaded through an opening in thegimbal fitting 630. By pivoting the gimbal fitting 630 with respect to the threadedshaft 620 of thehead 610, the angular orientation of theconductive member 570 with respect to the pilot hole 11 in theskull 10 can be accurately controlled. Once the operator determines that theconductive member 570 is at the appropriate angle, e.g., using a surgical navigation system such as that noted below, the operator may advance theconductive member 570 to position theconductive tip 574 at thetarget site 28. Once thetip 574 is in position, thecap 162 of a lead 160 may be press-fitted on thebody 610 of theelectrode 600. This will crimp theproximal length 572 of theconnective member 570 between thebody 610 and the conductiveinner surface 163 of thecap 162, providing an effective electrical connection between theconductive member 570 and thebody 164 of thelead 160. - C. Systems Employing Intracranial Electrodes
-
FIG. 19 is a schematic illustration of aneurostimulation system 1000 in accordance with one embodiment of the invention. Thisneurostimulation system 1000 includes anarray 1010 of intracranial electrodes and an internallyimplantable pulse system 1050. Thearray 1010 of electrodes may employ one or more electrodes in accordance with any one or more of the embodiments described above in connection withFIGS. 2-18 or any other suitable design. In the particular implementation depicted inFIG. 19 , the array 1010 (shown schematically inFIG. 20 ) includes a first implantableintracranial electrode 100 a and a second implantableintracranial electrode 100 b, each of which may be substantially the same as theelectrode 100 shown in FIGS. 2A-B. Theseelectrodes skull 10 into contact with thedura mater 20 at two spaced-apart locations. - The
pulse system 1050 may be implanted in the body of the patient P at a location remote from thearray 1010 ofelectrodes 100. In the embodiment shown inFIG. 19 , thepulse system 1050 is adapted to be implanted subclavicularly. In the alternative embodiment shown inFIG. 20 , thepulse system 1050 is adapted to be implanted in a recess formed in the patient'sskull 10. In either embodiment, each of theelectrodes 100 in thearray 1010 is electrically coupled to thepulse system 1050 by means of a separate lead (120 in FIGS. 2A-B) having an elongate, subcutaneouslyimplantable body 124. Hence,electrode 100 a is coupled to thepulse system 1050 by theelongate body 124 a of a first lead and theother electrode 100 b is coupled to thepulse system 1050 by theelongate body 124 b of another lead. In one embodiment, theelongate bodies 124 a-b are combined into a single subcutaneously implantable cable or ribbon. -
FIG. 21 schematically illustrates onepulse system 1050 suitable for use in theneurostimulation system 1000 shown inFIG. 19 . Thepulse system 1050 generally includes apower supply 1055, anintegrated controller 1060, apulse generator 1065, and apulse transmitter 1070. Thepower supply 1055 can be a primary battery, such as a rechargeable battery or other suitable device for storing electrical energy. In alternative embodiments, thepower supply 1055 can be an RF transducer or a magnetic transducer that receives broadcast energy emitted from an external power source and converts the broadcast energy into power for the electrical components of thepulse system 1050. - In one embodiment, the
controller 1060 includes a processor, a memory, and a programmable computer medium. Thecontroller 1060, for example, can be a computer, and the programmable computer medium can be software loaded into the memory of the computer and/or hardware that performs the requisite control functions. In an alternative embodiment suggested by dashed lines inFIG. 21 , thecontroller 1060 may include an integrated RF ormagnetic controller 1064 that communicates with anexternal controller 1062 via an RF or magnetic link. In such a circumstance, many of the functions of thecontroller 1060 may be resident in theexternal controller 1062 and theintegrated portion 1064 of thecontroller 1060 may comprise a wireless communication system. - The
controller 1060 is operatively coupled to and provides control signals to thepulse generator 1065, which may include a plurality of channels that send appropriate electrical pulses to thepulse transmitter 1070. Thepulse generator 1065 may have N channels, with at least one channel associated with each ofN electrodes 100 in thearray 1010. Thepulse generator 1065 sends appropriate electrical pulses to thepulse transmitter 1070, which is coupled to a plurality ofelectrodes 1080. In one embodiment, each of these electrodes is adapted to be physically connected to thebody 124 of a separate lead, allowing eachelectrode 1080 to electrically communicate with asingle electrode 100 in thearray 1010 on a dedicated channel of thepulse generator 1065. Suitable components for thepower supply 1055, theintegrated controller 1060, thepulse generator 1065, and thepulse transmitter 1070 are known to persons skilled in the art of implantable medical devices. - As shown in
FIG. 20 , thearray 1010 ofelectrodes 100 inFIG. 19 comprises a simple pair ofelectrodes FIGS. 23-26 illustrate alternative arrays that may be useful in other embodiments. InFIG. 23 , thearray 1010 a includes fourelectrodes 100 arranged in a rectangular array. Thearray 1010 b ofFIG. 24 includes sixteenelectrodes 100, also arranged in a rectangular array. Thearray 1010 c shown inFIG. 25 includes nineelectrodes 100 arranged in a radial array.FIG. 26 illustrates anarray 1010 d that includes fourelectrodes 100 x arranged in a rectangular pattern and afifth electrode 100 y at a location spaced from the other fourelectrodes 100 x. In using such an array, the fourproximate electrodes 100 x may be provided with the same polarity and thefifth electrode 100 y may have a different polarity. In some embodiments, the housing (1052 inFIG. 19 ) of thepulse system 1050 may serve the function of thefifth electrode 100 y. The precise shape, size, and location of thearray 1010 and the number ofelectrodes 100 in thearray 110 can be optimized to meet the requirements of any particular application. - The
electrodes 100 of thesearrays 1010 may be provided with electrical signals in a variety of different manners. In some circumstances, oneelectrode 100 or a subset of theelectrodes 100 may have one electrical potential and adifferent electrode 100 or subset of the electrodes 100 (or, in some embodiments, thehousing 1052 of the pulse system 1050) may have a different electrical potential. U.S. patent application Ser. No. 09/978,134, entitled “Systems and Methods for Automatically Optimizing Stimulus Parameters and Electrode Configurations for Neuro-Stimulators” and filed 15 Oct. 2001 (the entirety of which is incorporated herein by reference), suggests ways for optimizing the control of the electrical pulses delivered to theelectrodes 100 in anarray 1010. The methods and apparatus disclosed therein may be used to automatically determine the configuration of therapy electrodes and/or the parameters for the stimulus to treat or otherwise effectuate a change in neural function of a patient. - The preceding discussion focuses on use of intracranial electrodes (e.g.,
electrodes neurostimulation system 1000 shown inFIG. 19 , but a sensing unit (not shown) may be used in place of thepulse system 1050. Suitable components for such a sensing unit are known to those skilled in the art of electroencephalography. - D. Methods
- As noted above, other embodiments of the invention provide methods of implanting an intracranial electrode and/or methods of installing a neurostimulation system including an implantable intracranial electrode. In the following discussion, reference is made to the particular
intracranial electrode 100 illustrated in FIGS. 2A-B and to theneurostimulation system 1000 shown inFIG. 19 . It should be understood, though, that reference to this particular embodiment is solely for purposes of illustration and that the methods outlined below are not limited to any particular apparatus shown in the drawings or discussed in detail above. - As noted above, implanting conventional cortical electrodes typically requires a full craniotomy under general anesthesia to remove a relatively large (e.g., thumbnail-sized or larger) window in the skull. Craniotomies are performed under a general anesthetic and subject the patient to increased chances of infection.
- In accordance with one embodiment of the present invention, however, the diameter of the
electrode shaft 110 is sufficiently small to permit implantation under local anesthetic without requiring a craniotomy. In this embodiment, a relatively small (e.g., 4 mm or smaller) pilot hole may be formed through at least part of the thickness of the patient's skull adjacent a selected stimulation or monitoring site of the brain. When implanting theelectrode 100 of FIGS. 2A-B, it may be advantageous to extend the pilot hole through the entire thickness of the skull. Care should be taken to avoid undue trauma to the brain in forming the pilot hole. In one embodiment, an initial estimate of skull thickness can be made from MRI, CT, or other imaging information. A hand-held drill may be used to form a bore shallow enough to avoid extending through the entire skull. A stylus may be inserted into the pilot hole to confirm that it strikes relatively rigid bone. The drill may then be used to deepen the pilot hole in small increments, checking with the stylus after each increment to detect when the hole passes through the thickness of theinner cortex 14 of theskull 10. If so desired, the stylus may be graduated to allow a physician to measure the distance to the springy dura mater and this information can be used to select anelectrode 100 of appropriate length or, if an adjustable-length electrode (e.g.,electrode 300 of FIGS. 6A-B) is used, to adjust the electrode to an appropriate length. - The location of the pilot hole (and, ultimately the
electrode 100 received therein) can be selected in a variety of fashions. U.S. Patent Application Publication No. US 2002/0087201 and U.S. application Ser. No. 09/978,134 (both of which are incorporated hereinabove), for example, suggest approaches for selecting an appropriate stimulation site. When the desired site has been identified, the physician can bore the pilot hole to guide thecontact surface 115 of theelectrode 100 to that site. In one embodiment, the physician may use anatomical landmarks, e.g., cranial landmarks such as the bregma or the sagittal suture, to guide placement and orientation of the pilot hole. In another embodiment, a surgical navigation system may be employed to inform the physician during the procedure. Briefly, such systems may employ real-time imaging and/or proximity detection to guide a physician in placing the pilot hole and in placing theelectrode 100 in the pilot hole. In some systems, fiducials are positioned on the patient's scalp or skull prior to imaging and those fiducials are used as reference points in subsequent implantation. In other systems, real-time MRI or the like may be employed instead of or in conjunction with such fiducials. A number of suitable navigation systems are commercially available, such as the STEALTHSTATION TREON TGS sold by Medtronic Surgical Navigation Technologies of Louisville, Colorado, US. - Once the pilot hole is formed, the threaded
electrode 100 may be advanced along the pilot hole until thecontact surface 115 electrically contacts a desired portion of the patient's brain. If theelectrode 100 is intended to be positioned epidurally, this may comprise relatively atraumatically contacting thedura mater 20; if the electrode is to contact a site on the cerebral cortex, the electrode will be advanced to extend through the dura mater. Theelectrodes 100 may also be implanted to a selected depth within the cerebral cortex or at a deeper location in the brain. - In one embodiment, the length of the
electrode 100 is selected (or adjusted forelectrode 300, for example) to achieve the desired level of contact and the electrode will be advanced until a known relationship with the skull is achieved, e.g., when thehead 102 compresses thecontact ring 122 of thelead 120 against the exterior of theskull 10. In another embodiment, the thickness of theskull 10 need not be known to any significant accuracy before theelectrode 100 is implanted. Instead, theelectrode 100 may be connected, e.g., via thelead 120, to an impedance monitor and the impedance may be monitored as theelectrode 100 is being implanted. It is anticipated that the measured impedance will change when theelectrode 100 contacts thedura mater 20. Once this contact is detected, the physician may advance the electrode a small, fixed distance to ensure reliable electrical contact over time. - As noted above, the
electrode 100 may be coupled to alead 120. The timing of this coupling may vary with the nature of the coupling. For a lead 120 employing acontact ring 122 or the like positioned below thehead 102, the lead may be coupled to the electrode before the electrode is introduced into the skull. In other embodiments, the lead (e.g., lead 160 of FIGS. 3A-B) may be coupled to the electrode after the electrode is properly positioned with respect to the selected site of the brain. The lead, or at least a length thereof, may be implanted subcutaneously, e.g., by guiding it through a tunnel formed between the implant site and the intended site of a subclavicularly implantedpulse system 1050. The patient's scalp may then be closed over thehead 102 of theelectrode 100 so the electrode is completely enclosed. This can materially improve patient comfort compared to more convention systems wherein epilepsy monitoring electrodes or the like extend through the scalp to an extracorporeal connection. - Once the electrode is in place, an electrical stimulus may be delivered from a
pulse system 1050 to the patient's brain via thelead 120 and theelectrode 100. In certain embodiments of the invention discussed previously, a plurality ofelectrodes 100 may be implanted in an array (e.g.,array electrodes 100 may be coupled to thepulse system 1050 by an electricallyseparate lead 120. The precise nature of the stimulus delivered via the electrode(s) 100 can be varied as desired to diagnose or treat any particular condition. The type and frequency of stimulus may be selected as outlined in U.S. Patent Application Publication No. US 2002/0087201, for example, and also may be optimized as taught in U.S. application Ser. No. 09/978,134. - Unless the context clearly requires otherwise, throughout the description and the claims, the words “comprise,” “comprising,” and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense, that is to say, in a sense of “including, but not limited to.” Words using the singular or plural number also include the plural or singular number, respectively. When the claims use the word “or” in reference to a list of two or more items, that word covers all of the following interpretations of the word: any of the items in the list, all of the items in the list, and any combination of the items in the list.
- The above-detailed descriptions of embodiments of the invention are not intended to be exhaustive or to limit the invention to the precise form disclosed above. While specific embodiments of, and examples for, the invention are described above for illustrative purposes, various equivalent modifications are possible within the scope of the invention, as those skilled in the relevant art will recognize. For example, whereas steps are presented in a given order, alternative embodiments may perform steps in a different order. The various embodiments described herein can be combined to provide further embodiments.
- In general, the terms used in the following claims should not be construed to limit the invention to the specific embodiments disclosed in the specification, unless the above-detailed description explicitly defines such terms. While certain aspects of the invention are presented below in certain claim forms, the inventors contemplate the various aspects of the invention in any number of claim forms. Accordingly, the inventors reserve the right to add additional claims after filing the application to pursue such additional claim forms for other aspects of the invention.
Claims (30)
1. An intracranial electrode comprising:
a shaft including a distal contact surface adapted to electrically contact a surface of a patient's brain;
a head associated with the shaft, the head being sized to be positioned subcutaneously adjacent the patient's skull; and
threads carried by at least one of the head and the shaft, the threads being adapted to fix the electrode with respect to the patient's skull;
the electrode having an adjustable length adapted to change a contact force of the distal contact surface against the surface of the brain by adjusting the length of the electrode.
2. The intracranial electrode of claim 1 wherein the shaft is moveable with respect to the head to adjust the length of the electrode.
3. The intracranial electrode of claim 1 further comprising a spring adapted to move the shaft with respect to the head to adjust the length of the electrode.
4. The intracranial electrode of claim 1 further comprising a resilient elastomer adapted to move the shaft with respect to the head to adjust the length of the electrode.
5. The intracranial electrode of claim 1 wherein the shaft and the head include mating threads such that rotation of the shaft relative to the head adjusts the length of the electrode.
6. The intracranial electrode of claim 1 further comprising an abutment adapted to selectively engage the shaft, the abutment restricting movement of the shaft with respect to the head when engaged with the shaft and permitting movement of the shaft with respect to the head to adjust the length of the electrode when disengaged from the shaft.
7. The intracranial electrode of claim 1 wherein the shaft has a threaded length and a nonthreaded surface and the distal contact surface comprises at least a portion of the nonthreaded surface of the shaft.
8. The intracranial electrode of claim 1 wherein at least a portion of the head is adapted to be received in a bore in the patient's skull.
9. The intracranial electrode of claim 1 wherein the head includes a threaded member adapted to be received in a bore in the patient's skull and the shaft is adapted to move axially along a length of the threaded member.
10. The intracranial electrode of claim 1 wherein the head includes a threaded member adapted to be received in a bore in the patient's skull, the threaded member having internal threads that mate with external threads on the shaft such that rotation of the shaft relative to the head adjusts the length of the electrode.
11. The intracranial electrode of claim 1 wherein the shaft is electrically conductive and the head is electrically insulative.
12. The intracranial electrode of claim 1 wherein the shaft is electrically conductive and the head includes a length adapted to be received in the patient's skull and electrically insulate the patient's skull from the shaft.
13. The intracranial electrode of claim 1 wherein the head is electrically conductive, further comprising a dielectric cap adapted to electrically insulate the patient's scalp from the head.
14. The intracranial electrode of claim 1 further comprising a lead electrically coupled to the contact surface and adapted to carry an electrical signal to or from the contact surface.
15. The intracranial electrode of claim 1 further comprising a lead electrically coupled to the contact surface and adapted to carry an electrical signal subcutaneously from a pulse system to the contact surface.
16. The intracranial electrode of claim 1 further comprising a lead electrically coupled to the contact surface and adapted to be subcutaneously implanted adjacent a skull.
17. The intracranial electrode of claim 1 further comprising a lead electrically coupled to the contact surface, the lead being adapted for subcutaneous implantation and to deliver an electrical signal to or from the contact surface.
18. An intracranial electrode comprising:
a shaft including a distal contact surface adapted to electrically contact a surface of a patient's brain;
a head associated with the shaft, the head being sized to be positioned subcutaneously adjacent the patient's skull;
threads carried by at least one of the head and the shaft, the threads being adapted to fix the electrode with respect to the patient's skull; and
adjustment means adapted to adjust a length of the electrode to change a contact force of the distal contact surface against the surface of the brain.
19. An intracranial electrode, comprising:
an electrically conductive member having a blunt contact surface;
a dielectric member having an interior in which the electrically conductive member is received; and
an anchor carried by the electrically conductive member or the dielectric member and adapted to anchor at least one of the electrically conductive member and the dielectric member with respect to a patient's skull adjacent a brain surface such that the contact surface is in electrical contact with the brain surface and the dielectric member electrically insulates the skull from the electrically conductive member.
20. The intracranial electrode of claim 19 further comprising a dielectric cap adapted to electrically insulate the patient's scalp from the electrically conductive member.
21. The intracranial electrode of claim 19 further comprising a cap including an electrically conductive portion adapted to be electrically coupled to the electrically conductive member and a dielectric portion adapted to electrically insulate the patient's scalp from the electrically conductive member.
22. The intracranial electrode of claim 19 further comprising an electrical lead electrically coupled to the electrically conductive member.
23. The intracranial electrode of claim 19 wherein the anchor comprises an external surface of the dielectric member, an external surface of the electrically conductive member includes threads, and the dielectric member is adapted to urge the external surface outwardly into engagement with a lumen of a bore in the skull when the electrically conductive member is threaded into the interior of the dielectric member.
24. The intracranial electrode of claim 19 wherein the anchor is carried by the dielectric member and the electrically conductive member is adapted to move the contact surface with respect to the dielectric member.
25. The intracranial electrode of claim 19 wherein the anchor comprises threads carried by a threaded portion of the dielectric member and the electrically conductive member is slidable along a length of the threaded portion.
26. The intracranial electrode of claim 25 further comprising a spring adapted to push the contact surface of the electrically conductive member against the brain surface.
27. The intracranial electrode of claim 19 wherein the anchor comprises threads carried by the dielectric member and the electrically conductive member is fixed with respect to the dielectric member.
28. The intracranial electrode of claim 19 wherein the anchor comprises threads carried by the dielectric member and the electrically conductive member is splined for rotation with the dielectric member.
29. The intracranial electrode of claim 19 wherein the anchor member comprises an engagement surface of the dielectric member and the dielectric member comprises a compressible collar adapted to expand outwardly to engage the engagement surface with a lumen of a bore in the patient's skull.
30-51. (canceled)
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WO2004050175A1 (en) | 2004-06-17 |
US20040102828A1 (en) | 2004-05-27 |
AU2003295967A1 (en) | 2004-06-23 |
US7302298B2 (en) | 2007-11-27 |
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