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WO1995005117A1 - Ensemble a electrodes - Google Patents

Ensemble a electrodes Download PDF

Info

Publication number
WO1995005117A1
WO1995005117A1 PCT/GB1994/001783 GB9401783W WO9505117A1 WO 1995005117 A1 WO1995005117 A1 WO 1995005117A1 GB 9401783 W GB9401783 W GB 9401783W WO 9505117 A1 WO9505117 A1 WO 9505117A1
Authority
WO
WIPO (PCT)
Prior art keywords
piercing member
skin piercing
skin
conduit
conduit means
Prior art date
Application number
PCT/GB1994/001783
Other languages
English (en)
Inventor
Iver Arne Langmoen
Original Assignee
Medinnova Sf
Cockbain, Julian, Roderick, Michaelson
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Medinnova Sf, Cockbain, Julian, Roderick, Michaelson filed Critical Medinnova Sf
Publication of WO1995005117A1 publication Critical patent/WO1995005117A1/fr

Links

Classifications

    • 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
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/07—Endoradiosondes
    • A61B5/076—Permanent implantation
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof

Definitions

  • the invention relates to transcutaneous conduit means, in particular for intracranial electrode assemblies.
  • a transcutaneous conduit attaching it to apparatus outside the body.
  • a conduit may simply take the form of a hollow tube, catheter or cannula through which fluid may be introduced into the body from outside or through which fluid may be drained out of the body, for example for diagnostic testing, for treatment and return, or to relieve pressure build up.
  • Other forms of conduit however include electrical leads for supply of power to or to transmit signals from devices surgically placed within the body.
  • the aperture in the skin through which it passes may either be especially created for it or must exist already, e.g. as a result of accident or injury or as a result of the implantation of the device to which the conduit is connected.
  • the conduit is passed through a pre ⁇ existing aperture which is subsequently closed up around the conduit or it is passed from outside the body through an aperture created for it.
  • the patient may respond to surgical excision of brain regions which are foci of epileptic activity. Such foci may occur deep within the brain and to identify them electrodes or electrode strips capable of detecting electrical activity at a plurality of sites are implanted, generally in the sub-dural cavity beneath the brain.
  • the leads to such electrodes are generally taken through the skin at a site remote from the site at which the electrodes themselves are inserted. This is generally done by piercing a hole through the skin from the outside with a stiletto (needle) and drawing the leads out from the body through this hole. As mentioned above however this brings about the risk of infection from the skin surface, a risk which is particularly severe in the case of the brain.
  • the invention provides a surgical implant apparatus comprising a conduit means with attached thereto a skin piercing member, which conduit means if hollow is sealed at at least the end attached to said skin piercing member.
  • the apparatus of the invention desirably has the interior of the conduit means sealed at the skin piercing member end. If the conduit contains an electrical lead however this will desirably be electrically connected to electrical contact means on the surface of the skin piercing member.
  • the conduit means is desirably attached at its end remote from the skin piercing member to an implantable device such as an electrode or electrode array.
  • the end of the conduit means remote from the skin piercing member may simply be open to allow fluid to pass therethrough.
  • the conduit means in the apparatus of the invention can itself take any suitable form although it will preferably comprise at least one electrical lead or at least one hollow fluid transfer conduit. In the latter case the skin piercing member will conveniently seal off the end of the conduit at which it is attached so that contamination of the interior of the conduit does not occur during passage through the skin.
  • the skin piercing member or its tip may be removed or a needle may be inserted into a portion of the conduit external to the body to allow fluid transfer in or out of the body.
  • the conduit means comprises as least one electrical lead and while such leads may be detachable from the skin piercing member, it is especially preferred that this member should provide one or more corresponding electrical contacts for connection to apparatus external to the body, e.g. voltage detection or current supply apparatus.
  • the skin piercing member it is particularly convenient for the skin piercing member to constitute an electrical jack or plug engageable with a receiving member to bring one or more electrical contacts on the piercing member into electrical contact with corresponding electrical contacts in the receiving member. In this way the skin penetration member, after passage out through the skin, may simply be plugged into a receiving socket in apparatus outside the body (after suitable wiping, cleaning and drying if desired) .
  • the invention thus provides a surgically implantable electrode assembly comprising electrode means connected to a skin piercing member by an electrical lead, said skin piercing member having on its surface an electrical contact member electrically connected to said electrode means by said lead.
  • the skin piercing member will conveniently take the form of an elongate spike having a central core member provided at one end with a piercing means (e.g. a point or spike) and with one or more annular electrically conducting contact members dispersed along its length, preferably spaced apart by electrically non-conducting annular members, e.g. of a plastics material such as Teflon.
  • a piercing means e.g. a point or spike
  • annular electrically conducting contact members dispersed along its length, preferably spaced apart by electrically non-conducting annular members, e.g. of a plastics material such as Teflon.
  • the core and the piercing means may be of unitary construction if desired, but if flexibility is required it will be preferred that the core be of a flexible material, e.g. plastics, while the piercing means will preferably be of hard material, e.g. metal or harder plastics. Where the core is itself electrically conducting, then it will generally be provided with a non-conducting sheath to isolate it electrically from one or more of the electrical contact members. In an alternative construction however the body of the skin piercing member may comprise a non-conducting matrix, with a plurality of laterally or circumferentially separated, axially extensive contact members embedded therein or carrying thereon a plurality of axially separated annular contact members.
  • the conduit means may be connected to the skin piercing member in any convenient manner, but where the conduit means are electrical leads these will, as indicated above, preferably be in electrical contact with a surface portion of the skin piercing member. Moreover such electrical leads will generally be provided along at least a portion of their length with an insulator coating.
  • the skin piercing member should be used to pierce the skin some centimetres away from the incision through which the conduit and any attached device are inserted for surgical implantation.
  • the skin piercing member will generally be so formed as to allow it to be moved subdermally before skin piercing occurs. While it may thus take an essentially needle-like or stiletto form with the skin piercing means on its tip, in an alternative embodiment the skin piercing means is provided as a flange so that skin piercing only occurs when the member having been pushed subdermally is then drawn back. The flange piercing the skin may be grasped, e.g.
  • the skin piercing member will preferably be 2 to 15 cm long, especially 5 to 10 cm. Its minimum cross-sectional dimension, e.g. its diameter if it is of circular cross section, will conveniently be in the range of 1 to 5 mm, especially 2-4 mm. If it takes the form of a flat strip, the maximum cross-sectional dimension, i.e. the strip width, will conveniently be in the range 2 - 12 mm .
  • the skin piercing member may be detachable from the conduit means and thus viewed from another aspect the invention provides an elongate skin piercing device having a skin piercing means and a plurality of surface electrical contact members each provided with electrical lead attachment sites.
  • the electrical lead attachment sites in the devices of the invention may comprise one part of a male-female socket but also may comprise a region, preferably an indentation, at which a lead may be attached by other conventional means, e.g. by soldering or by overlay of a curable adhesive or resin.
  • the contact members are annular rings disposed about a central core and separated by non-conducting rings, leads may be attached mechanically by placement between a connecting and a non-connecting ring and by axial compression of the rings, e.g. by tightening a screw or bolt in or on a threaded core.
  • the end of the conduit means remote from the skin piercing member may be or may be adapted to be connected to apparatus surgically implanted in the body, e.g. an electrode assembly.
  • apparatus surgically implanted in the body e.g. an electrode assembly.
  • Figure 1 is a perspective drawing of the intracranial electrode assembly according to the invention.
  • Figure 2 is a longitudinal sectional view of the skin piercing member in the assembly of Figure 1,- and
  • Figure 3 is a perspective view of an alternative skin piercing member for an electrode assembly as shown in Figure 1.
  • an intracranial electrode strip 1 comprising a flexible plastics strip 2 with disposed therein a plurality of electrode plates 3 each having an exposed metal surface 4 and each being electrically connected on the reverse side to an electrical lead 5.
  • Intracranial electrode strips of this type are known and have been in use for several years.
  • the electrical leads 5 are individually plastics coated between their extremities and are together encased in a plastics sheath 6 between electrode plates 3 and their junction to skin piercing member 7.
  • the skin piercing member comprises a conical steel spike 8 attached to a threaded core 9 which is provided with a plastics sheath 10.
  • core 9 Alternatively disposed about core 9 are conducting 11 and non-conducting 12 annular rings of brass and plastics, the entire assembly being held together by nut 13 screwed onto the threaded end of core 9.
  • a channel 14 along the side of the skin piercing member is a channel 14 in which the electrical leads 5 are disposed, with the different leads being held in electrical contact with the different conducting rings by cured adhesive 15 also disposed within channel 12.
  • spike 8 and core 9 are of metal. However if greater flexibility is required these can be of plastics in which case sheath 10 may be dispensed with.
  • the skin piercing member is in the form of a strip 16 having conducting surface portions 17 and a backwards directed flange 18 which is pointed to provide the means for skin piercing on insertion between the skin and the skull and subsequent slight retraction.
  • This configuration allows for careful positioning of the skin piercing flange before piercing occurs.
  • the electrode strip and the attached lead are inserted into the cranial cavity through a first incision in the scalp from the edges of which the skin is peeled back to prevent contact with the strip and lead and with any of the surgical implements being used.
  • the skin piercing member is then inserted between the peeled back skin and the underlying tissue and its spike is pushed out through the skin some centimetres away from the first incision.
  • the skin piercing member and the connected lead are then drawn through the skin and the skin piercing member is inserted, as an electrical jack, into the electrical potential monitoring apparatus.

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Veterinary Medicine (AREA)
  • Public Health (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • General Health & Medical Sciences (AREA)
  • Surgery (AREA)
  • Physics & Mathematics (AREA)
  • Molecular Biology (AREA)
  • Medical Informatics (AREA)
  • Pathology (AREA)
  • Biophysics (AREA)
  • Neurology (AREA)
  • Neurosurgery (AREA)
  • Psychology (AREA)
  • Cardiology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Radiology & Medical Imaging (AREA)
  • Electrotherapy Devices (AREA)

Abstract

Appareil chirurgical à implant pouvant avantageusement comporter un ensemble à électrodes et des conducteurs électriques raccordés à celui-ci, mais pouvant également comporter une canalisation d'amenée de fluide, comportant un conduit auquel est fixé un élément transdermique. Si ledit conduit est creux, il est obturé au moins à l'extrémité fixée à l'élément transdermique. Selon un mode préféré de réalisation, la canalisation (6) contient des conducteurs électriques (5) reliant des contacts électriques (11) prévus sur l'élément transdermique (7) aux électrodes (3, 4) d'un groupe d'électrodes (1), l'élément transdermique ayant lui-même la forme d'une fiche électrique pouvant s'engager dans une douille.
PCT/GB1994/001783 1993-08-17 1994-08-15 Ensemble a electrodes WO1995005117A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9317099.1 1993-08-17
GB939317099A GB9317099D0 (en) 1993-08-17 1993-08-17 Electrode assembly

Publications (1)

Publication Number Publication Date
WO1995005117A1 true WO1995005117A1 (fr) 1995-02-23

Family

ID=10740628

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1994/001783 WO1995005117A1 (fr) 1993-08-17 1994-08-15 Ensemble a electrodes

Country Status (2)

Country Link
GB (1) GB9317099D0 (fr)
WO (1) WO1995005117A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0832667A3 (fr) * 1996-09-27 1999-11-24 Medtronic, Inc. Electrode de stimulation du cerveau à haute résolution
US8150523B2 (en) 1999-06-11 2012-04-03 Cornell Research Foundation, Inc. Feedback method for deep brain stimulation with detection of generalized efference copy signals
EP2679152A4 (fr) * 2011-02-25 2015-10-07 Tohoku Microtec Co Ltd Sonde cérébrale et procédé de fabrication associé

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0009619A1 (fr) * 1978-09-30 1980-04-16 BIOTRONIK Mess- und Therapiegeräte GmbH & Co Ingenieurbüro Berlin Electrode pour stimulateur cardiaque pour application transveineuse
DE3203300A1 (de) * 1981-02-02 1982-08-26 Medtronic, Inc., 55440 Minneapolis, Minn. Implantierbare leitung
EP0199215A2 (fr) * 1985-04-25 1986-10-29 Westinghouse Electric Corporation Sonde électro-encéphalographique introduite dans l'épiderme
US4667686A (en) * 1985-05-16 1987-05-26 Cordis Corporation Pacer lead terminal assembly
US4735208A (en) * 1987-01-09 1988-04-05 Ad-Tech Medical Instrument Corp. Subdural strip electrode for determining epileptogenic foci
US4852573A (en) * 1987-12-04 1989-08-01 Kennedy Philip R Implantable neural electrode
US4903702A (en) * 1988-10-17 1990-02-27 Ad-Tech Medical Instrument Corporation Brain-contact for sensing epileptogenic foci with improved accuracy
WO1993009840A1 (fr) * 1991-11-18 1993-05-27 Medtronic, Inc. Conducteur temporaire bipolaire de stimulation et son connecteur, et cable bipolaire permanent pour le tronc nerveux

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0009619A1 (fr) * 1978-09-30 1980-04-16 BIOTRONIK Mess- und Therapiegeräte GmbH & Co Ingenieurbüro Berlin Electrode pour stimulateur cardiaque pour application transveineuse
DE3203300A1 (de) * 1981-02-02 1982-08-26 Medtronic, Inc., 55440 Minneapolis, Minn. Implantierbare leitung
EP0199215A2 (fr) * 1985-04-25 1986-10-29 Westinghouse Electric Corporation Sonde électro-encéphalographique introduite dans l'épiderme
US4667686A (en) * 1985-05-16 1987-05-26 Cordis Corporation Pacer lead terminal assembly
US4735208A (en) * 1987-01-09 1988-04-05 Ad-Tech Medical Instrument Corp. Subdural strip electrode for determining epileptogenic foci
US4735208B1 (en) * 1987-01-09 1995-07-04 Ad Tech Medical Instr Corp Subdural strip electrode for determining epileptogenic foci
US4852573A (en) * 1987-12-04 1989-08-01 Kennedy Philip R Implantable neural electrode
US4903702A (en) * 1988-10-17 1990-02-27 Ad-Tech Medical Instrument Corporation Brain-contact for sensing epileptogenic foci with improved accuracy
WO1993009840A1 (fr) * 1991-11-18 1993-05-27 Medtronic, Inc. Conducteur temporaire bipolaire de stimulation et son connecteur, et cable bipolaire permanent pour le tronc nerveux

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0832667A3 (fr) * 1996-09-27 1999-11-24 Medtronic, Inc. Electrode de stimulation du cerveau à haute résolution
US8150523B2 (en) 1999-06-11 2012-04-03 Cornell Research Foundation, Inc. Feedback method for deep brain stimulation with detection of generalized efference copy signals
EP2679152A4 (fr) * 2011-02-25 2015-10-07 Tohoku Microtec Co Ltd Sonde cérébrale et procédé de fabrication associé

Also Published As

Publication number Publication date
GB9317099D0 (en) 1993-09-29

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