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Time sharing multipolar rheography apparatus and method

  • US 5,501,702 A
  • Filed: 07/19/1994
  • Issued: 03/26/1996
  • Est. Priority Date: 06/06/1994
  • Status: Expired due to Term
First Claim
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1. A pulse generator system comprising:

  • a plurality of electrodes, each adapted to be disposed at a separate site in a patient'"'"'s body;

    a plurality of conductive leads, each coupled at a distal end to one of said plurality of electrodes;

    first and second switching circuits coupled to a proximal end of each of said plurality of leads;

    a rheography pulse generating circuit coupled to said first switching circuit, said rheogmphy pulse generating circuit adapted to generate a constant current rheography pulse in response to a rheography pulse control signal;

    an impedance detection circuit having first and second terminals coupled to said second switching circuit, said impedance detection circuit adapted to produce an output voltage corresponding to an impedance present between said first and second impedance detection circuit terminals;

    control circuitry coupled to said first and second switching circuits and to said rheography pulse generating circuit. said control circuitry adapted to generate a source control signal identifying two of said plurality of leads, and to generate a recording control signal identifying two of said plurality of leads, and to generate said rheography pulse control signal;

    wherein said first switching circuit is responsive to said source control signal to couple said two leads identified by said source control signal to said rheography pulse generating circuit, and wherein said second switching circuit is responsive to said recording control signal to couple said two leads identified by said recording control signal to said first and second impedance detection circuit terminals, respectively;

    such that said rheography current pulse is conducted on said leads identified by said source control signal and such that said impedance detection circuit output voltage corresponds to impedance between said leads identified by said recording control signal.

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