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Microprocessor controlled apparatus for the noninvasive determination of peripheral outflow and flow disturbances

  • US 5,009,231 A
  • Filed: 03/17/1987
  • Issued: 04/23/1991
  • Est. Priority Date: 03/18/1986
  • Status: Expired due to Term
First Claim
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1. A measurement apparatus for the noninvasive determination of peripheral blood outflow and flow disturbances in veins of human beings, said apparatus including at least one light transmitter and one light receiver for directing and receiving reflected light from an extremity of said being, an evaluation and read-out circuit to ascertain blood outflow and inflow in the veins by means of measuring the change in light reflection, said evaluation and read-out circuit including means to raise, prior to said measuring, the current flowing through the light transmitter until the signal-to-noise ratio of the receiver has attained a specific value.

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