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Apparatus and method for determining a plurality of hemodynamic variables from a single, chroniclaly implanted absolute pressure sensor

  • US 5,368,040 A
  • Filed: 08/02/1993
  • Issued: 11/29/1994
  • Est. Priority Date: 08/02/1993
  • Status: Expired due to Term
First Claim
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1. A method of pressure monitoring employing an absolute pressure sensor, which provides an output signal having an amplitude which varies according to pressure, comprising:

  • implanting said absolute pressure sensor in said right ventricle of said patient;

    deriving a first derivative of said output signal;

    deriving a second derivative of said output signal;

    providing said output signal to first, second and third holding means for storing signal amplitudes;

    enabling said first holding means and said second holding means in response to occurrence of an R-wave;

    thereafter storing a first output signal amplitude in said first holding means in response to said first derivative being less than zero, wherein said first stored output signal amplitude is equal to said patient'"'"'s pulmonary artery systolic pressure and, storing a second output signal amplitude in said second holding means in response to said second derivative being less than zero, wherein said second stored output value is equal to said patient'"'"'s pulmonary artery diastolic pressure;

    enabling said third holding means in response to occurrence of a P-wave;

    thereafter storing a third output signal amplitude in said third holding means in response to said first derivative being less than zero, wherein said third stored output signal amplitude is equal to said patient'"'"'s right atrial systolic pressure;

    delaying said output signal; and

    storing an amplitude of said delayed output signal in a fourth holding means for storing signal amplitudes in response to occurrence of said P-wave, wherein said stored amplitude of said delayed output signal is equal to said patient'"'"'s right atrial diastolic pressure.

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