Implantable devices using rechargeable zero-volt technology lithium-ion batteries

  • US 7,248,929 B2
  • Filed: 04/18/2003
  • Issued: 07/24/2007
  • Est. Priority Date: 07/30/1999
  • Status: Active Grant
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First Claim
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1. An implantable device comprising:

  • electronic circuitry that performs a specified function;

    an implantable rechargeable battery that provides operating power for the electronic circuitry; and

    battery charging and protection circuitry that receives power from an external charger and controls the charging of the rechargeable battery to protect the rechargeable battery from overcharge and undercharge conditions;

    wherein the implantable rechargeable battery comprises a lithium-ion or lithium-ion polymer battery having an anode electrode with a substrate made substantially from titanium whereby the rechargeable battery may discharge to zero volts without damage; and

    wherein the battery charging and protection circuitry applies a charging current to said rechargeable battery as a function of a rechargeable battery voltage.

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