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Defibrillator electrode
| Details |
Inventors: Milijasevic, Zoran; Holley, Loraine K.; Skalsky, Michael;
Assignee: Telectronics N.V. (NL)
Primary Examiner: Jaworski; Francis
Assistant Examiner:
Attorney, Agent or Firm: Finnegan, Henderson, Farabow, Garrett & Dunner
A patch-type defibrillator electrode for direct contact with the heart has a thin, flat, flexible generally circular mesh or foil conductive member with a pattern of slits for enabling continuous contact with the three dimensional, time-varying heart surface topography. The slit pattern includes two pairs of non-intersecting semicircular slits oriented along mutually perpendicular axes, and interior portions of the conductive member are flexibly movable in a direction normal to the plane member and are flexibly tiltable about the axes to provide the conforming contact. The slits may also be radial slits which do not meet at the center so the leaves of conductive members are independently mobile with respect to every other leaf. A Dacron envelope having a thrombus formation inhibiting agent surrounds the conductive member including the peripheral edges to reduce the risk of tissue burning from current supplied to the center of the conductive member by an electrode lead. |
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DETAILED DESCRIPTION What is claimed is: 1.
An apparatus for use as an electrode for implantation in a patient and affixation to tissue therein having a three dimensional, time-varying surface topography, the apparatus comprising: a tissue-contacting member including a sheet of electrically conductive, flexible material having a generally unflexed planar shape, and a plurality of elongated slits arranged in a pattern in said sheet, said slits allowing the sheet to conform to the tissue and to any movement thereof, a part of at least one interior portion of said sheet defined by said pattern being flexibly movable in a direction perpendicular to the plane of said sheet past sheet portions separated from said movable portion by said pattern of slits for continuously conforming said tissue-contacting member to the tissue during any movement of the tissue.
2.
Apparatus as in claim 1 wherein said slit pattern is arranged to allow said one interior portion defined by said slit pattern to be flexibly tiltable about at least one axis lying in the plane of said sheet.
3.
Apparatus as in claim 1 wherein said slit pattern is arranged to allow said one interior portion defined by said slit pattern to be flexibly tiltable about two axes lying in the plane of said sheet, said axes being mutually perpendicular to one another.
4.
Apparatus as in claim 1 wherein each of said plurality of slits terminates short of the edge of said sheet, said sheet having an unslit peripheral portion.
5.
Apparatus for use as an electrode adapted for implantation in a patient for contact with tissue having a time-varying, three dimensional surface topography, the apparatus comprising: a sheet of electrically conductive flexible material having a distal surface for contacting the tissue and an opposed proximal surface; and a plurality of slits formed in said sheet in a pattern, said plurality of slits including a first pair of complementary slits extending generally in a first sheet direction, a part of the sheet portion central to said pair of slits being flexibly movable past first sheet portions separated from said central sheet portion by said first pair of slits, in a direction normal to said proximal and said distal surfaces for continuously conforming said electrically conductive flexible material to the tissue during any movement of the tissue
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