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Multiple frequency impedance measurement system

  • US 5,282,840 A
  • Filed: 03/26/1992
  • Issued: 02/01/1994
  • Est. Priority Date: 03/26/1992
  • Status: Expired due to Term
First Claim
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1. A cardiac pacemaker, comprising:

  • pulse generator means for generating cardiac pacing pulses and for delivering said cardiac pacing pulses to a patient'"'"'s heart;

    timing means coupled to said pulse generator means for controlling the rate at which said pacing pulses are generated;

    means for monitoring said patient'"'"'s body tissue, said means for monitoring comprising a pair of electrodes adapted to be in contact with said tissue to be monitored, signal generator means for generating electrical signals at at least first and second frequencies for application to said pair of electrodes, measuring means responsive to signals at said first and second frequencies, for measuring the impedance between said pair of electrodes at said first and second frequencies, and means for detecting changes in the relationship of said measured impedances at said first and second frequencies; and

    means coupled to said monitoring means and to said timing means for varying the rate at which said pacing pulses are generated in response to the detection of changes in said relationship of said impedances measured at said first and second frequencies.

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