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

Claim 14:
15. A method for operating an external charging device in a wireless charging system, the method comprising:
driving, using signal generating circuitry of the external charging device, current through a coil at a charging frequency to induce current in a second coil in an implantable medical device;
generating, at monitoring circuitry of the external charging device, an output signal to monitor charging operations;
applying, using a comb filter of the external charging device, filtering to the output signal generated by the monitoring circuitry to remove noise from the output signal, the filtering applied based on the charging frequency;
processing the filtered output signal to detect a circuit state of charging circuitry of the implantable medical device during charging operations; and
varying the charging frequency based, in part, on detection of the circuit state of the charging circuitry of the implantable medical device.