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Inductively rechargeable implantable device with reduced eddy currents

  • US 9,531,195 B2
  • Filed: 04/29/2011
  • Issued: 12/27/2016
  • Est. Priority Date: 04/29/2011
  • Status: Active Grant
First Claim
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1. An implantable device, comprising:

  • a conductive case, adapted for subcutaneous implantation, encasing a rechargeable battery, a control circuitry, and an inductive recharging coil, the inductive recharging coil, coupled to the rechargeable battery and the control circuitry, adapted to provide recharging current to the rechargeable battery in response to a proximate electromagnetic field, the conductive case including an outer shell, the outer shell having an outer surface with a pattern of grooves disposed thereupon, the grooves being oriented substantially normal to an anticipated direction of eddy current flow in response to the proximate electromagnetic field generated by the inductive recharging coil wherein the inductive recharging coil is not attached to a magnetic shield;

    wherein the grooves are arranged in a substantially radial pattern on the outer surface of the outer shell;

    wherein a depth of at least one groove of the pattern of grooves is non-uniform along a radial length of the groove.

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