Technique for creating a zero reference for an external pressure

Details Technique for creating a zero reference for an external pressure Technique for creating a zero reference for an external pressure

1987-04-27

1988-08-16

Hindenburg, Max

Surgery

Truss

Pad

128692, A61B 502

Patent

active

047636491

ABSTRACT:
Apparatus for measuring the blood pressure of a patient, comprising a catheter, a first transducer mounted in an end portion of said catheter so as to produce at an output thereof a signal corresponding to blood pressure variation thereat, means defining an opening in said catheter at a point near said first transducer so that the blood pressure at said opening is the same as the blood pressure applied to said first transducer, means coupled to said first transducer for deriving a first signal in which the low frequency components of the signal provided by said first transducer are de-emphasized, and means including a second transducer coupled to said catheter at a point remote from said opening for deriving a second signal in which the high frequency components of the blood pressure variations at said opening are de-emphasized.

REFERENCES:
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patent: 4023563 (1977-05-01), Reynolds et al.
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patent: 4423738 (1984-01-01), Newgard
patent: 4431009 (1984-02-01), Marino et al.
patent: 4456013 (1984-01-01), De Rossi et al.
patent: 4475556 (1984-10-01), Reiff
"Arterial Pressure Waveform Recording: A Clinical System", Wilkins et al., Bio-Med. Eng. 1972.

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