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Apparatus and method for measuring, formatting and transmitting combined intracardiac impedance data and electrograms

  • US 5,300,093 A
  • Filed: 09/14/1992
  • Issued: 04/05/1994
  • Est. Priority Date: 09/14/1992
  • Status: Expired due to Term
First Claim
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1. A cardiac apparatus, comprising:

  • means for measuring impedance within a patient'"'"'s body;

    means for deriving at least one time-varying physiological parameter a function of the measured impedance;

    means for selecting samples of said at least one time-varying physiological parameter;

    means for formatting the selected samples into a time sequence of digital samples representing the amplitude of said at least one time-varying physiological parameter;

    an external monitoring device;

    means for transmitting said formatted samples to said external monitoring device;

    means for measuring cardiac electrical signals within the patient'"'"'s body;

    means for selecting samples of said cardiac electrical signals;

    means for formatting the selected electrical signals into a time sequence of digital samples representing the amplitude of said cardiac electrical signals; and

    means for combining said at least one physiological parameter time sequence with said cardiac electrical signal time sequences into a combined sequence of digital samples, wherein said transmitting means transmits said combined sequence of digital samples to said external monitoring device, including;

    means for encoding said at least one physiological parameter time sequence into a serial data stream of signal bits,means for encoding said cardiac electrical signal time sequence into a time sequence of multiple-bit digital samples wherein the value of each multiple-bit sample corresponds to an instantaneous amplitude of the cardiac electrical signal, andmeans for truncating the multiple-bit digital samples by one bit for each of said at least one physiological parameter sequence and replacing each truncated bit with the single bit of said at least one time varying physiological parameter serial data stream of single bits.

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