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Portable pulse sensor

  • US 3,908,636 A
  • Filed: 02/15/1974
  • Issued: 09/30/1975
  • Est. Priority Date: 02/15/1974
  • Status: Expired due to Term
First Claim
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1. A cardiovascular instrument for audible detection of cardiovascular activity of a living subject comprising:

  • a case adapted for portability and unobtrusive storage upon the person of the subject;

    a test station within said case for receiving an appendage of a subject under test;

    an aperture in said case positioned to communicate with said test station within said case for passing an appendage of the subject therethrough into said test station;

    a light source positioned within and effectively mounted on said case, adjacent said aperture, and on one side of said test station in a position to impinge an appendage of the subject inserted through said aperture into said test station with light energy;

    an electro-optical transducer means positioned within said test station and effectively mounted on said case opposite and in optical alignment with said light source for being occulted by a appendage of the subject when inserted through said aperture into said test station to thereby receive light which has passed through said appendage of the subject;

    circuit means attached to said case and positioned therein and electrically connected to said photoelectric transducer for receipt of electrical signals therefrom and production of larger amplitude signals having a predetermined relationship to the cardiovascular activity of the subject and including a rate determining circuit which connects said larger amplitude signals to said electroacoustic transducer during a predetermined time interval;

    electroacoustic transducer means attached to said case and positioned therewithin and electrically connected to said circuit means for producing acoustic signals in response to the larger amplitude electrical signals produced thereby;

    electrical power source means mounted to and within said case and electrically connected to said light source and said circuit means for the supply of electrical operating potentials thereto; and

    switch means attached to and positioned within said case means at the terminal end of said test station for engagement by the appendage of the subject when inserted through said aperture into said test station and electrically connected between said source of electrical power and said light source and said circuit means for establishing electrical power when the appendage of the subject is inserted and for interrupting electrical power when the appendage is withdrawn from said test station.

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