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Technique for creating a zero reference for an external pressure transducer

  • US 4,763,649 A
  • Filed: 04/27/1987
  • Issued: 08/16/1988
  • Est. Priority Date: 11/27/1985
  • Status: Expired due to Fees
First Claim
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1. Apparatus for measuring the blood pressure of a patient, comprisinga catheter,a first transducer mounted in an end portion of said catheter so as to produce at an output thereof means including a signal corresponding to blood pressure variation thereat,a lumen contained within said catheter,means defining an opening in said lumen 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 component in which the low frequency components of the signal provided by said first transducer are de-emphasized,means for coupling a second transducer coupled to said lumen at a point remote from said opening for deriving a second signal component in which the high frequency components of the blood pressure variations at said opening are de-emphasized, andmeans for combining said signal components.

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