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Perfusion ratio detector

  • US 4,424,814 A
  • Filed: 03/30/1981
  • Issued: 01/10/1984
  • Est. Priority Date: 03/30/1981
  • Status: Expired due to Fees
First Claim
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1. A perfusion ratio detector comprising;

  • means for detecting blood flow through the body including non-invasive ultrasonic detection means adapted for contact with the patient'"'"'s skin about a pressure point of the body,means coupled from said detecting means for providing a pulse signal the duration of which is representative of flow period,rate converter means coupled from said detection means responsive to the flow period signal and including means for providing a cyclic signal of frequency greater than the rate of the flow period pulse signal,gate means for receiving said flow period and cyclic signals to provide a gated pulse train representative of perfusion ratio,means for counting said gated pulse train,and means coupled from said means for counting for displaying, substantially instantaneously upon occurrence of said flow period signal, a visual indication of perfusion ratio so as to immediately inform the observer as to the efficacy of perfusion flow.

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