Implantable medical devices having multi-cell power sources

摘要

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 that is selectively coupled between the first and second cells and a high power output circuit that is directly coupled to the first and second cells in a parallel configuration. An isolation circuit is coupled to the first cell, the second cell and the low power circuit to maintain a current isolation between the first cell and the second cell at least during delivery currents having a large magnitude that are delivered to the high power output circuit.

主权项

1. An implantable medical device, comprising:
a high power output circuit for delivery of an electrical stimulation therapy; a first cell directly coupled to the high power output circuit; a second cell directly coupled to the high power output circuit, the first and second cells being arranged in a parallel configuration; a low power control circuit directly coupled to the second cell, wherein the low power circuit receives a first level of current from the first and second cells; and an isolation circuit coupled to the first cell, the second cell, and the low power control circuit, wherein the isolation circuit is configured to maintain a current isolation between the first cell and the second cell such that a second level of current is delivered from both the first and second cells to the high power output circuit, wherein the second level of current is greater than the first level of current.