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Automatic blood pressure monitor employing artifact rejection method and apparatus

  • US 5,337,750 A
  • Filed: 07/30/1992
  • Issued: 08/16/1994
  • Est. Priority Date: 07/30/1992
  • Status: Expired due to Fees
First Claim
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1. In a method for using a blood pressure monitor of the type having a blood pressure cuff:

  • an air pump in fluid communication with said cuff to direct pressurized air into said cuff, an air valve in fluid communication with said cuff to selectively vent said cuff to atmosphere, a pressure transducer in fluid communication with said cuff generating an output including a pressure signal indicative of a steady state fluid pressure in said cuff corresponding to an occlusive pressure exerted by said cuff on an artery and a transient fluid pressure in said cuff indicative of an amplitude of an oscillometric waveform, a processor in electrical communication with said air pump and said air valve for selectively energizing said air pump or valve to pressurize or depressurize said cuff respectively comprising;

    (a) setting the steady state fluid pressure in said cuff to an initial value;

    (b) sampling the output of said transducer over a plurality of heartbeats to generate samples of said oscillometric waveform;

    (c) prior to identifying the existence of an oscillometric pulse during any period of time, summing the samples of said transducer output taken after one heartbeat with the samples of said transducer output taken at corresponding times after a plurality of other heartbeats to obtain composite samples of said oscillometric waveform over a plurality of heartbeats, said composite samples corresponding to an average oscillometric waveform;

    (d) storing said composite samples;

    (e) altering the steady state fluid pressure in said cuff;

    (f) repeating steps (b)-(e) a plurality of times; and

    (g) analyzing said average oscillometric waveforms to determine blood pressure.

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