Monitoring multi-cell power source of an implantable medical device
First Claim
1. An implantable medical device, comprising:
- operational circuitry comprising a low power circuit and a high power output circuit, wherein the high power output circuit comprises a transformer having a first primary winding and a second primary winding;
a power source comprising at least first and second cells coupled to the operational circuitry, the first cell being coupled to the first primary winding and the second cell being coupled to the second primary winding;
an isolation circuit connected to the first and second cells to maintain current isolation between the first and second cells during delivery of energy to the high power output circuit during high power operation while allowing both the first and second cells to contribute current to power the low power circuit during low power operation, wherein the first and second cells are configured in a first configuration to deliver energy to the low power circuit and in a second configuration that is different from the first configuration to deliver energy to the high power output circuit;
a control circuit operable to selectively configure the first and second cells in the first and second configurations, wherein the first cell and second cell simultaneously deliver energy to the high power output circuit when configured in the second configuration; and
a monitoring circuit coupled to the power source to monitor an energy level of each of the first cell and the second cell and operable to compute a first value corresponding to a parameter of the first cell and a second value corresponding to the parameter of the second cell, wherein the monitoring circuit evaluates the first value and the second value to detect a fault condition associated with at least one of the first and second cells.
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Accused Products
Abstract
An implantable medical device includes a low-power circuit and a multi-cell power source. The cells of the power source are coupled in a parallel configuration. The implantable medical device includes both a low power circuit and a high power circuit that are coupled between the first and second cells. An isolation circuit is coupled to the first cell and the second cell in a safe parallel orientation and the first and second cells are configured in a first configuration to deliver energy to the low power circuit segment and in a second configuration that is different from the first configuration to deliver energy to the high power circuit segment. A monitoring circuit is coupled to the power source and operable to evaluate the first cell and the second cell to detect a fault condition associated with at least one of the first and second cells.
168 Citations
21 Claims
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1. An implantable medical device, comprising:
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operational circuitry comprising a low power circuit and a high power output circuit, wherein the high power output circuit comprises a transformer having a first primary winding and a second primary winding; a power source comprising at least first and second cells coupled to the operational circuitry, the first cell being coupled to the first primary winding and the second cell being coupled to the second primary winding; an isolation circuit connected to the first and second cells to maintain current isolation between the first and second cells during delivery of energy to the high power output circuit during high power operation while allowing both the first and second cells to contribute current to power the low power circuit during low power operation, wherein the first and second cells are configured in a first configuration to deliver energy to the low power circuit and in a second configuration that is different from the first configuration to deliver energy to the high power output circuit; a control circuit operable to selectively configure the first and second cells in the first and second configurations, wherein the first cell and second cell simultaneously deliver energy to the high power output circuit when configured in the second configuration; and a monitoring circuit coupled to the power source to monitor an energy level of each of the first cell and the second cell and operable to compute a first value corresponding to a parameter of the first cell and a second value corresponding to the parameter of the second cell, wherein the monitoring circuit evaluates the first value and the second value to detect a fault condition associated with at least one of the first and second cells. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An implantable medical device, comprising:
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operational circuitry comprising a low power circuit and a high power output circuit, wherein the high power output circuit comprises a transformer having a first primary winding and a second primary winding; a power source comprising at least first and second cells coupled to the operational circuitry, the first cell being coupled to the first primary winding and the second cell being coupled to the second primary winding; means for isolating the first cell from the second cell to maintain current isolation between the first and second cells during delivery of energy to the high power output circuit during high power operation while allowing both the first and second cells to contribute current to power the low power circuit during low power operation, wherein the first and second cells are arranged in a first configuration to deliver energy to the low power circuit and a second configuration that is different from the first configuration to deliver energy to the high power output circuit; means for selectively configuring the first and second cells in the first and second configurations, wherein the first cell and second cell simultaneously deliver energy to the high power output circuit when configured in the second configuration; and means for monitoring an energy level of the power source to compute a first value corresponding to a parameter of the first cell and a second value corresponding to the parameter of the second cell, wherein the monitoring circuit evaluates the first value and the second value to detect a fault condition associated with at least one of the first and second cells. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification