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External charger for a medical implantable device using field inducing coils to improve coupling

  • US 8,311,638 B2
  • Filed: 10/15/2009
  • Issued: 11/13/2012
  • Est. Priority Date: 10/15/2009
  • Status: Expired due to Fees
First Claim
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1. An external charger for use with an implantable medical device, comprising:

  • a primary coil for producing a first magnetic field for providing power to the implantable medical device;

    a plurality of position determination coils for producing second magnetic fields;

    an alignment sensing circuit for determining an alignment of the primary coil relative to the implantable medical device, wherein the determination is based on electrical measurements taken from the plurality of position determination coils; and

    a position indication circuit for receiving the determination and for indicating to a user a misalignment of the external charger relative to the implantable medical device.

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