Inductively rechargeable external energy source, charger, system and method for a transcutaneous inductive charger for an implantable medical device
First Claim
1. A system, comprising:
- an implantable medical device adapted to be implanted within a patient, comprising;
a rechargeable power source; and
a secondary coil coupled to the rechargeable power source; and
an external device, comprising;
a housing having a surface adapted to assume a position in proximity to a surface of the patient during recharging of the rechargeable power source;
a primary coil adapted to be transcutaneously coupled to the secondary coil during the recharging; and
a temperature sensor in said external device and adapted to sense a temperature of the surface of the housing during the recharging; and
control circuitry to limit energy transfer based on the temperature of the surface of the housing to limit a temperature of the external device to no more than a predetermined temperature.
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Abstract
Techniques for transcutaneous transferral of energy to an implantable medical device are disclosed. An embodiment includes a system comprising an implantable medical device having a secondary coil. An external device is provided to transcutaneously transfer energy to the secondary coil. The external device comprises a housing having a side adapted to be positioned in proximity to the secondary coil when the external device is transferring energy to the secondary coil. A temperature sensor is coupled to the side to determine a temperature indicative of heat to which the patient is being exposed during the transfer of energy. A control circuit is adapted to control the transfer of energy to the secondary coil based on the temperature. For instance, the control circuit may limit transfer of energy by controlling times at which transfer of energy occurs or controlling an amplitude of a signal within the external device.
176 Citations
18 Claims
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1. A system, comprising:
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an implantable medical device adapted to be implanted within a patient, comprising; a rechargeable power source; and a secondary coil coupled to the rechargeable power source; and an external device, comprising; a housing having a surface adapted to assume a position in proximity to a surface of the patient during recharging of the rechargeable power source; a primary coil adapted to be transcutaneously coupled to the secondary coil during the recharging; and a temperature sensor in said external device and adapted to sense a temperature of the surface of the housing during the recharging; and control circuitry to limit energy transfer based on the temperature of the surface of the housing to limit a temperature of the external device to no more than a predetermined temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system, comprising:
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an implantable medical device implantable within a patient and comprising a secondary coil; and an external device to transcutaneously transfer energy to the secondary coil, the external device comprising; a housing having a side adapted to be positioned in proximity to the secondary coil when the external device is transferring energy to the secondary coil; a temperature sensor in said housing and coupled to the side to determine a temperature indicative of heat to which the patient is being exposed during the transfer of energy; and a control circuit adapted to limit the transfer of energy to the secondary coil based on the temperature; wherein the control circuit is adapted to limit the transfer of energy so that the temperature does not exceed a maximum temperature. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification