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Spinal cord stimulator system

  • US 9,887,574 B2
  • Filed: 03/10/2015
  • Issued: 02/06/2018
  • Est. Priority Date: 03/15/2013
  • Status: Active Grant
First Claim
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1. A wireless charger for automatically tuning an optimum frequency to inductively charge a rechargeable battery of an implantable pulse generator (IPG) that generates spinal cord stimulation signals for a human body, the wireless charger comprising:

  • a processor;

    a charging coil adapted to be wirelessly coupled to a receiving coil of the IPG to charge the rechargeable battery;

    a frequency generator configured to generate a charging signal under control of the processor;

    a power amplifier configured to receive the charging signal and generate an amplified charging signal under control of the charging signal;

    a reflected impedance sensor coupled to the charging coil to detect a reflected impedance of the charging coil;

    an optimization circuit coupled to the reflected impedance sensor and adapted to select an optimum frequency of the charging signal supplied to the charging coil based on the detected reflected impedances of a plurality of charging frequencies in a selected frequency range.

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