Patent ID: 11969605
Assignee: ADVANCED NEUROMODULATION SYSTEMS, INC.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 9:
10. A wireless charging system comprising:
an implantable medical device comprising charging circuitry; and
an external charging device configured to wirelessly charge the implantable medical device, the external charging device comprising:
a coil;
signal generating circuitry coupled to the coil to drive current through the coil at a charging frequency to induce current in a second coil in the implantable medical device;
monitoring circuitry coupled to the coil to generate an output signal to monitor charging operations; and
a comb filter coupled to the monitoring circuitry, the comb filter configured to apply filtering to the output signal generated by the monitoring circuitry to remove noise from the output signal, wherein the filtering is applied based on the charging frequency;

wherein the external charging device is configured to process the filtered output signal to detect a circuit state of the charging circuitry of the implantable medical device during charging operations; and
wherein the external charging device is configured to vary the charging frequency based, in part, on detection of the circuit state of the charging circuitry of the implantable medical device.