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Apparatus for the noninvasive determination and acoustical representation of the dynamic behavior of peripheral venous hemodynamic

  • US 4,836,212 A
  • Filed: 03/17/1987
  • Issued: 06/06/1989
  • Est. Priority Date: 03/18/1986
  • Status: Expired due to Fees
First Claim
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1. A measuring apparatus for the noninvasive determination of peripheral outflow and flow disturbances in the extremities of human beings, having at least one light transmitter and one light receiver as well as an evaluation and read-out unit to ascertain the temporal course of the outflow and inflow of blood in the veins by means of measuring the change in light reflection, whereby said evaluation and read-out circuit is provided with a digitally controlled tone generator and an electroacoustic transducer for emitting a first signal to indicate that the apparatus is ready to measure, a second succession of tones, the frequency of which follows the changes in the intensity of the light reflection until termination of blood outflow or inflow, and a third signal, which indicates the end of the measurement.

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