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Device for rheoplethysmography by occlusion

  • US 4,169,463 A
  • Filed: 06/06/1977
  • Issued: 10/02/1979
  • Est. Priority Date: 06/16/1976
  • Status: Expired due to Term
First Claim
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1. A device for rheoplethysmography by occlusion adapted in particular to the study of vascular behavior of a lower limb of a patient comprising pressure-applying means for causing occlusion of a lower limb under study, means for controlling the characteristics of progressive variation in the pressure applied by the pressure-applying means as a function of time during occlusion of the limb under study, a plethysmograph for delivering signals which are representative of an electrical impedance related to said limb under study and of the variations in said electrical impedance, of a normal limb of the same type as the limb under study, and means for determining, from coefficients of standardization which are characteristic of the healthy vascular operation of a normal limb of the same type as the limb under study and said signals, indices which are representative of the vascular behavior of said limb under study, said pressure-applying means including a control loop having a amplifier for establishing a comparison between a predetermined reference value and the value of the pressure within the collar, a transducer for measuring said collar pressure, a circuit means for controlling the inflation of the collar, and a pump which inflates said collar.

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