Device for rheoplethysmography by occlusion
First Claim
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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Abstract
The device for studying vascular behavior particularly in a lower limb of a patient comprises pressure applying means for causing occlusion of the 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 the limb under study and of variations in such electrical impedance, 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 from the signals, indices which are representative of the vascular behavior of the limb under study.
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Citations
14 Claims
- 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.
Specification