Technique for creating a zero reference for an external pressure transducer
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United States of America Patent
Stats
-
Aug 16, 1988
Issued Date -
N/A
app pub date -
Apr 27, 1987
filing date -
Nov 27, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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