INSULATIVE SHROUD FOR PLATE-TYPE ELECTRODES ADAPTED FOR CHRONIC IMPLANTATION
First Claim
1. A subcutaneous cardiac activity sensing device, comprising:
- an implantable medical device (IMD), wherein the exterior surface of the IMD housing is rendered electrically insulative;
a shroud member subsequently coupled to the part of the periphery of the IMD;
a header portion subsequently coupled to the shroud member and to a different portion of the periphery of the IMD;
at least one electrically insulated elongated conductor coupled to a hermetic feedthrough pin disposed between the IMD housing and the header portion; and
at least one electrode mechanically coupled to the elongated conductor and the shroud member.
1 Assignment
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Accused Products
Abstract
The invention provides diverse ways to reduce if not eliminate the possibility of an errant electrical path from one or more conductors of the shroud to a portion of the conductive housing of its corresponding IMD. That is—as described hereinbelow prior to backfilling the shroud with medical adhesive as a final fabrication step—according to various forms of the invention biocompatible electrical insulation is added between an IMD housing and the elongated conductors that couple to the surface electrodes. For example, a parylene coating can be added to the outside of the IMD housing using a simple spraying procedure and/or dip coating the IMD housing into the parylene. Parylene is a proven biocompatible, electrically insulative material. In addition to or in lieu of a coating or layer of parylene, a dielectric layer such as titanium nitride (TiN) or the like can be sputtered to the elongated conductors. Similarly, a layer of other materials could be added to the housing of the IMD and/or to the elongated conductors.
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Citations
20 Claims
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1. A subcutaneous cardiac activity sensing device, comprising:
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an implantable medical device (IMD), wherein the exterior surface of the IMD housing is rendered electrically insulative; a shroud member subsequently coupled to the part of the periphery of the IMD; a header portion subsequently coupled to the shroud member and to a different portion of the periphery of the IMD; at least one electrically insulated elongated conductor coupled to a hermetic feedthrough pin disposed between the IMD housing and the header portion; and at least one electrode mechanically coupled to the elongated conductor and the shroud member. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 20)
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19. A method of fabricating a cardiac sensing shroud assembly, comprising:
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rendering a conductive housing for an implantable medical device (IMD) electrically insulative; providing a resilient shroud member adapted to be mounted around at least a part of the peripheral portion of the housing; forming an aperture in a peripheral portion of the shroud member; and coupling a substantially flat surfaced electrode into engagement in the aperture of the resilient substantially clear shroud.
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Specification