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Ocular pneumoplethysmograph and method of operation

  • US 3,911,903 A
  • Filed: 10/11/1973
  • Issued: 10/14/1975
  • Est. Priority Date: 10/11/1973
  • Status: Expired due to Term
First Claim
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1. An apparatus for determining blood pressure pulse waves at constantly changing levels of external vacuum as an indication of blood flow to a particular part of a human body comprising:

  • a. vacuum transmitting means attachable to a body portion to deform said portion in response to changing sub-atmospheric pressure in a system external to the body portion;

    b. detecting means for detecting pressure changes in said system in response to changes in the volume of the body portion;

    c. vacuum control means for continuously varying the sub-atmospheric pressure in said external system over a predetermined pressure range;

    d. said detecting means comprising a first chamber separated by a diaphragm from a second chamber, each of said chambers being operatively connected to said vacuum control means through a flow restrictor;

    e. said vacuum transmitting means being operatively connected to one of said chambers independent of said flow restrictor and operatively connected to said vacuum control means through said flow restrictor;

    f. and recording means for continuously recording pressure changes caused by said volume changes.

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