Battery management for an implantable medical device
First Claim
1. Circuitry for an implantable medical device, comprising:
- a first charging path comprisinga source powered by an input voltage and configured to produce power to charge a battery at a battery terminal node, andan overvoltage switch configured to gate the produced power to the battery terminal node, wherein the overvoltage switch is opened if a battery overvoltage signal is asserted; and
at least one load switch comprising a first terminal directly connected to the battery terminal node and a second terminal coupled to a load within the implantable medical device, wherein the at least one load switch is configured to gate a battery voltage from the battery terminal voltage to the load, wherein the at least one load switch is opened at least if a battery undervoltage signal is asserted.
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Abstract
Battery management circuitry for an implantable medical device such as an implantable neurostimulator is described. The circuitry has a T-shape with respect to the battery terminal, with charging circuitry coupled between rectifier circuitry and the battery terminal on one side of the T, and load isolation circuitry coupled between the load and the battery terminal on the other side. The load isolation circuitry can comprise two switches wired in parallel. An undervoltage fault condition opens both switches to isolate the battery terminal from the load to prevent further dissipation of the battery. Other fault conditions will open only one the switches leaving the other closed to allow for reduced power to the load to continue implant operations albeit at safer low-power levels. The battery management circuitry can be fixed in a particular location on an integrated circuit which also includes for example the stimulation circuitry for the electrodes.
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Citations
17 Claims
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1. Circuitry for an implantable medical device, comprising:
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a first charging path comprising a source powered by an input voltage and configured to produce power to charge a battery at a battery terminal node, and an overvoltage switch configured to gate the produced power to the battery terminal node, wherein the overvoltage switch is opened if a battery overvoltage signal is asserted; and at least one load switch comprising a first terminal directly connected to the battery terminal node and a second terminal coupled to a load within the implantable medical device, wherein the at least one load switch is configured to gate a battery voltage from the battery terminal voltage to the load, wherein the at least one load switch is opened at least if a battery undervoltage signal is asserted. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification