Implantable medical device having isolated multi-cell power sources
First Claim
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1. An implantable medical system, comprising:
- a hermetically sealed housing defining a housing interior;
a low power circuit disposed within the housing interior;
a high power output circuit disposed within the housing interior, wherein the high power output circuit includes a transformer assembly comprising a plurality of primary windings;
a power source disposed within the housing interior, the power source comprising;
a plurality of cells;
a cell isolation circuit including a plurality of current limiters, wherein each of the plurality of cells is coupled in series to a different one of the plurality of current limiters;
a first terminal coupled to the cell isolation circuit such that the low power circuit is coupled to the first terminal, wherein each cell of the plurality of cells is coupled to the first terminal through the different one of the plurality of current limiters; and
a second plurality of terminals, wherein each of the plurality of primary windings of the high power output circuit is coupled to a different one of each of the second plurality of terminals, wherein each of the plurality of cells is directly coupled to only one of the second plurality of terminals; and
a medical electrical lead coupled to the housing and in electrical communication with the high power output circuit.
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Abstract
Implantable medical device systems of the present disclosure may include a subcutaneous implantable cardioverter defibrillator (SICD) that is powered by a multi-cell power source that is connected to a transformer and power conversion circuitry to charge one or more relatively small, but powerful, high voltage capacitors to provide a relatively high discharge voltage. The SICD includes electrical isolation for the multi-cell power source to protect against cross-charging between the cells during the operational lifetime of the SICD.
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Citations
20 Claims
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1. An implantable medical system, comprising:
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a hermetically sealed housing defining a housing interior; a low power circuit disposed within the housing interior; a high power output circuit disposed within the housing interior, wherein the high power output circuit includes a transformer assembly comprising a plurality of primary windings; a power source disposed within the housing interior, the power source comprising; a plurality of cells; a cell isolation circuit including a plurality of current limiters, wherein each of the plurality of cells is coupled in series to a different one of the plurality of current limiters; a first terminal coupled to the cell isolation circuit such that the low power circuit is coupled to the first terminal, wherein each cell of the plurality of cells is coupled to the first terminal through the different one of the plurality of current limiters; and a second plurality of terminals, wherein each of the plurality of primary windings of the high power output circuit is coupled to a different one of each of the second plurality of terminals, wherein each of the plurality of cells is directly coupled to only one of the second plurality of terminals; and a medical electrical lead coupled to the housing and in electrical communication with the high power output circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An implantable medical system, comprising:
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a hermetically sealed housing defining a housing interior; a low power circuit disposed within the housing interior; a high power output circuit disposed within the housing interior, wherein the high power output circuit includes a transformer assembly comprising a plurality of primary windings; a power source disposed within the housing interior, the power source comprising a plurality of cells; and a cell isolation circuit including a plurality of current limiters, wherein each of the plurality of cells is coupled in series to a different one of the plurality of current limiters; wherein each cell of the plurality of cells is coupled to the low power circuit through the different one of the plurality of current limiters, and further wherein each of the plurality of primary windings of the high power output circuit is coupled to a different cell of the plurality of cells. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification