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Non-invasive automatic blood pressure measuring apparatus

  • US 5,072,736 A
  • Filed: 01/19/1990
  • Issued: 12/17/1991
  • Est. Priority Date: 01/19/1990
  • Status: Expired due to Fees
First Claim
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1. A non-invasive automatic blood pressure measuring apparatus comprising:

  • a measuring cuff adapted for decompression after compression and attachment to a part of a body, the measuring cuff having a proximal side and a distal side;

    a blood flow meter non-invasively detecting the blood flow of the arteries on the proximal or distal side of said cuff.a moving average blood flow signal detecting means calculating a moving average blood flow signal from the blood flow of the arteries on the proximal or distal side of said cuff, the average blood flow signal detecting means calculating a 1% average blood flow signal value representative of a blood flow standing up point and a 99% average blood flow signal value representative of a blood flow returning point;

    a blood flow standing up point detecting means monitoring blood flow to detect the 1% average blood flow signal value during a decompression process of internal pressure on said cuff;

    a blood flow returning point detecting means monitoring the blood flow to detect the 99% average blood flow signal value during a further decompression process of internal pressure on said cuff;

    a maximal blood pressure holding means storing a maximal blood pressure value corresponding to the internal pressure in said cuff when the 1% average blood flow signal value is detected by the blood flow standing up point detecting means;

    a minimal blood pressure holding means storing a minimal blood pressure value corresponding to the internal pressure in said cuff when the 99% average blood flow signal value is detected by the blood flow standing up point detecting means; and

    an output means indicating or printing out the stored maximal and minimal blood pressure values.

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