Implantable medical devices and systems having power management for recharge sessions
First Claim
1. An implantable medical device, comprising:
- a tank circuit comprising a variable reactance;
a battery;
a rectifier between the battery and the tank circuit;
a controller in electrical communication with the variable reactance, the controller comprising logic that sets the variable reactance to a first value when receiving recharge energy and sets the variable reactance to a second value upon detecting an overcharge condition while receiving recharge energy; and
medical circuitry in electrical communication with the battery.
1 Assignment
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Accused Products
Abstract
Implantable devices and related systems utilize power management features in conjunction with a recharge circuit that includes a coil and capacitance. The reactance such as the capacitance and/or inductance may be variable such that in the event of an overcharge condition, the reactance may be varied to change the resonant frequency of the circuit of the coil from the recharge frequency to another frequency to reduce the power being received. Other power management features may additionally or alternatively be employed. For instance, the device may send an uplink telemetry signal to an external device to request that recharge power be decreased. The device may switch additional resistance into the circuit of the coil to reduce the Q of the circuit. As another example, the device may clamp the circuit of the coil to ground.
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Citations
22 Claims
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1. An implantable medical device, comprising:
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a tank circuit comprising a variable reactance; a battery; a rectifier between the battery and the tank circuit; a controller in electrical communication with the variable reactance, the controller comprising logic that sets the variable reactance to a first value when receiving recharge energy and sets the variable reactance to a second value upon detecting an overcharge condition while receiving recharge energy; and medical circuitry in electrical communication with the battery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An implantable medical device, comprising:
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a tank circuit comprising a variable reactance; a battery; a rectifier between the battery and the tank circuit; a controller in electrical communication with the variable reactance, the controller comprising logic to set the variable reactance to a first value when receiving recharge energy and to set the variable reactance to a second value upon detecting an overcharge condition while receiving recharge energy; and medical circuitry in electrical communication with the battery, wherein the tank circuit comprises a first coil portion and a second coil portion, wherein the variable reactance comprises a variable capacitance that comprises; a first capacitor; a second capacitor; and a switch that places the second capacitor in a parallel relationship with the first capacitor when in a first state, the controller being in electrical communication with the switch, wherein a first node of the second capacitor is connected between the first coil portion and the second coil portion and a second node of the second capacitor is connected to the switch.
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22. An implantable medical device, comprising:
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a tank circuit comprising a variable reactance; a battery; a rectifier between the battery and the tank circuit; a controller in electrical communication with the variable reactance, the controller comprising logic to set the variable reactance to a first value when receiving recharge energy and to set the variable reactance to a second value upon detecting an overcharge condition while receiving recharge energy; and medical circuitry in electrical communication with the battery, wherein the tank circuit comprises a capacitor and a variable inductance, wherein the variable inductance comprises; a first coil portion; a second coil portion; and a switch that places the second coil portion in a parallel relationship with the first coil portion when in a first state, the controller being in electrical communication with the switch.
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Specification