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Sphygmomanometer

  • US 4,821,734 A
  • Filed: 07/16/1987
  • Issued: 04/18/1989
  • Est. Priority Date: 04/21/1987
  • Status: Expired due to Term
First Claim
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1. A non-invasive manometer comprising:

  • pressure means attached to an appendage for applying a pressure thereto;

    pressure changing means for changing the pressure applied to said appendage;

    optical means for sensing a change in a blood vessel of the appendage due to the applied pressure of the pressure means and internal pressure of the blood vessel caused by beating of a heart, the optical means including a light emitting unit and a photosensitive unit, the units including at least first and second pairs of light emitting elements and photosensitive elements;

    shielding means for shielding the optical means from light external to the optical means;

    clock means for operating the light emitting and photosensitive units alternately in a time-divisional manner;

    said first pair of light emitting element and photosensitive element being disposed on said appendage closer to said heart than said second pair of light emitting element and photosensitive element, said second pair of light emitting element and photosensitive element, which is disposed on a peripheral side, for determining a systolic blood pressure; and

    comparison means for comprising outputs from two or more pairs of elements of the optical means, which are disposed closer to said heart and disposed on the peripheral side, to determine a diastolic pressure when said outputs coincide.

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