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Mitigation of respiratory artifact in blood pressure signal using line segment smoothing

  • US 5,752,919 A
  • Filed: 12/17/1996
  • Issued: 05/19/1998
  • Est. Priority Date: 12/17/1996
  • Status: Expired due to Fees
First Claim
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1. A blood pressure monitoring apparatus, comprising:

  • at least one pressure transducer which senses a patient'"'"'s blood pressure and outputs a blood pressure signal;

    an A/D converter which samples said blood pressure signal and outputs blood pressure samples;

    a microprocessor which processes said blood pressure samples to determine blood pressure characteristic values representative of a patient'"'"'s blood pressure, said microprocessor including respiration artifact reduction software which reduces respiratory artifacts in said blood pressure samples by determining, for each heart beat detected in said blood pressure samples, the blood pressure at a median point of a line connecting a blood pressure characteristic value for a current heart beat with a corresponding blood pressure characteristic value for a heart beat a predetermined number of heart beats prior to said current heart beat;

    a display buffer which stores a value of the blood pressure of said median point determined by said microprocessor as the blood pressure characteristic value for the current heart beat; and

    a display monitor which displays the blood pressure characteristic values stored in said display buffer as indicative of the patient'"'"'s blood pressure.

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