Implantable medical device having heat-shrink conforming shield
First Claim
1. An implantable cardioverter defibrillator (ICD) device capable of subcutaneous positioning within a patient, the implantable cardioverter defibrillator comprising:
- a housing comprising a biocompatible material at least a portion of which is conductive and used as an electrode for the ICD device;
circuitry positioned within the housing to control delivery of cardioversion/defibrillation countershocks, wherein the circuitry is susceptible to undesirable coupling effects;
an energy source coupled to the circuitry;
a capacitive energy storage system coupled to the energy source and the circuitry;
a first shape conforming isolation material encapsulating the circuitry inside the housing,a thin layer of conductive shielding material surrounding the first shape conforming isolation material; and
a second shape conforming isolation material encapsulating the thin layer of shielding material.
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Accused Products
Abstract
An implantable medical device, such as an implantable cardioverter defibrillator (ICD), utilizes a heat-shrink conforming shield to substantially isolate internal components and circuitry from the device housing and from each other. Preferably, the shield also protects the internal circuitry of the device from undesirable electro-magnetic coupling effects. The shape conforming isolation material provides an inexpensive, effective isolation barrier that helps shield the circuitry from undesired coupling effects and also protects the components from inadvertent shorts as well as potential damage during assembly and testing.
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Citations
12 Claims
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1. An implantable cardioverter defibrillator (ICD) device capable of subcutaneous positioning within a patient, the implantable cardioverter defibrillator comprising:
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a housing comprising a biocompatible material at least a portion of which is conductive and used as an electrode for the ICD device; circuitry positioned within the housing to control delivery of cardioversion/defibrillation countershocks, wherein the circuitry is susceptible to undesirable coupling effects; an energy source coupled to the circuitry; a capacitive energy storage system coupled to the energy source and the circuitry; a first shape conforming isolation material encapsulating the circuitry inside the housing, a thin layer of conductive shielding material surrounding the first shape conforming isolation material; and a second shape conforming isolation material encapsulating the thin layer of shielding material. - View Dependent Claims (2, 3, 4, 5)
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6. An implantable medical device comprising:
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a sealed housing made of a biocompatible conductive metallic material; circuitry positioned within the housing; at least a first heat-shrink shape conforming isolation material encapsulating a portion of the circuitry to shield the portion of the circuitry from the housing; a thin layer of conductive shielding material surrounding the first shape conforming isolation material; and a second shape conforming isolation material encapsulating the layer of shielding material. - View Dependent Claims (7, 8, 9, 10, 11)
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12. An implantable medical device comprising:
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a sealed housing made of a biocompatible conductive metallic material; circuitry positioned within the housing; at least a first shape conforming isolation material adhered to an inner surface of the housing to shield a portion of the circuitry from the housing; a thin layer of conductive shielding material surrounding the first shape conforming isolation material; and a second shape conforming isolation material encapsulating the layer of shielding material.
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Specification