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 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.
1 Assignment
0 Petitions
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
51 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 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. - 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 coil and a capacitance; a battery; a rectifier between the battery and the tank circuit; a capacitor low side switch coupled between the capacitance and ground and an inductor low side switch coupled between the coil and ground; a controller in electrical communication with the capacitor low side switch and inductor low side switch, the controller comprising logic to close the capacitor low side switch and the inductor low side switch upon detecting an overcharge condition; and medical circuitry in electrical communication with the battery. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29)
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30. An implantable medical device, comprising:
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a tank circuit comprising a coil and a capacitance; a battery; a rectifier between the battery and the tank circuit; a circuit pathway including a switch in series with a resistor, the circuit pathway being in parallel with the coil; a controller comprising logic to set the switch of the circuit pathway to a first state while an overcharge condition is undetected, and to set the switch of the circuit pathway to a second state upon detecting the overcharge condition; and medical circuitry in electrical communication with the battery. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38)
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39. An implantable medical device, comprising:
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a tank circuit comprising a coil and a capacitance; drive circuitry coupled to opposite sides of the tank circuit; a battery; a rectifier between the battery and the tank circuit; a controller in electrical communication with the drive circuitry, the controller comprising logic to control the drive circuitry to ring the tank circuit when detecting an overcharge condition while receiving recharge energy; and medical circuitry in electrical communication with the battery. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46, 47)
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48. A medical system, comprising:
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an external device comprising; an inductive charging module that emits recharge energy; a controller that activates the inductive charging module; and an implantable medical device comprising; a tank circuit comprising a coil and 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.
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49. A medical system, comprising:
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an external device comprising; an inductive charging module that emits recharge energy; a controller that activates the inductive charging module; and an implantable medical device comprising; a tank circuit comprising a coil and a capacitance; a battery; a rectifier between the battery and the tank circuit; a capacitor low side switch coupled between the capacitance and ground and a inductor low side switch coupled between the coil and ground; a controller in electrical communication with the capacitor low side switch and inductor low side switch, the controller comprising logic to close the capacitor low side switch and the inductor low side switch upon detecting an overcharge condition; and medical circuitry in electrical communication with the battery.
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50. A medical system, comprising:
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an external device comprising; an inductive charging module that emits recharge energy; a controller that activates the inductive charging module; and an implantable medical device comprising; a tank circuit comprising a coil and a capacitance; a battery; a rectifier between the battery and the tank circuit; a circuit pathway including a switch in series with a resistor, the circuit pathway being in parallel with the coil; a controller comprising logic to set the switch of the circuit pathway to a first state while an overcharge condition is undetected, and to set the switch of the circuit pathway to a second state upon detecting the overcharge condition; and medical circuitry in electrical communication with the battery.
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51. A medical system, comprising:
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an external device comprising; an inductive charging module that emits recharge energy; a controller that activates the inductive charging module; and an implantable medical device comprising; a tank circuit comprising a coil and a capacitance; a battery; a rectifier between the battery and the tank circuit; drive circuitry coupled to opposite sides of the tank circuit; a battery; a rectifier between the battery and the tank circuit; a controller in electrical communication with the drive circuitry, the controller comprising logic to control the drive circuitry to ring the tank circuit when detecting an overcharge condition while receiving recharge energy; and medical circuitry in electrical communication with the battery.
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Specification