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Implantable stimulator with terminal voltage control of a depletable voltage source

  • US 5,876,423 A
  • Filed: 06/04/1997
  • Issued: 03/02/1999
  • Est. Priority Date: 06/04/1996
  • Status: Expired due to Term
First Claim
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1. An implantable stimulator, comprising:

  • a depletable voltage source for supplying electrical energy, the voltage source having a terminal voltage which varies as a function of depletion of the voltage source;

    an output stage receiving electrical energy from the voltage source and including means for generating a stimulation voltage that is increased with respect to the terminal voltage of the voltage source and a stimulation energy storage device for storing the stimulation voltage;

    a control device receiving operational energy from the voltage source and being operatively connected for controlling a stimulation operation of the stimulation energy storage device; and

    a pump control device receiving operational energy from the voltage source and being operatively connected to the output stage for controlling at least one of a time interval and a current strength of the electrical energy supplied to the output stage so that a minimum operating voltage required for a safe operation of the control devices is maintained as the terminal voltage of the voltage source.

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