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Calibrated arterial pressure measurement device

  • US 4,677,984 A
  • Filed: 09/24/1984
  • Issued: 07/07/1987
  • Est. Priority Date: 09/24/1984
  • Status: Expired due to Fees
First Claim
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1. An apparatus for measuring arterial blood pressure and recreating the arterial blood pressure waveform throughout the cardiac cycle of a patient, comprising:

  • an inflatable cuff;

    a source of selectively variable pneumatic pressure connected to said cuff to inflate and deflate said cuff;

    a pressure transducer connected such that it detects the magnitude of the pneumatic pressure applied to said cuff and provides a transducer output signal responsive to said magnitude, said transducer output signal including transitions corresponding to increases in the detected pressure magnitude at the beginning of arterial blood flow beneath said inflatable cuff during a cardiac cycle and transitions corresponding to decreases in the detected pressure at the end of arterial blood flow beneath said inflatable cuff during a cardiac cycle;

    an electrocardiographic means for sensing the electrical signals of the patient'"'"'s heart and for providing an R-wave output signal responsive to the R-wave in said electrical signals; and

    a control means electrically connected to receive said transducer output signal and said R-wave output signal, which control means processes said output signals to calculate the elapsed times from the occurrence of the R-wave in a cardiac cycle to said transitions in said transducer output signal and to accumulate data corresponding to said calculated elapsed times and the magnitude of said pneumatic pressure for each cardiac cycle, and to provide output information corresponding to the magnitude of the blood pressure of the patient with respect to time within the cardiac cycle, said control means further providing control signals to said source of variable pneumatic pressure to control the rates of increase and decrease of said pneumatic pressure.

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