B. Michaux, J.J. Vanhoutte, M.Y. Jaffrin, G. Fontenier Departement Genie Biologique, Universite de Technologie de Compiegne/France Mercury strain gauge plethysmography has first been described by Whitney in 1953 (1) in order to assess blood f low in the linibs. It is an attractive method because it is external, simple and can be used on fingers s well s limbs. This method has been widely used in measurement o£ flow (1,2,5,9,11), systolic (6,8), diastolic and venous pressure (8). The results seem to be in good agreement with various others methods (6,7,9). A silastic capillary filled with mercury is attached around the limb. The diange in girth of the limb induces a change o£ the resistarce of the mercury column dR/R = 2 dL/L (R and L being the resistance of the gauge and the girth of the limb) For isotropic radial dilatations dS = 2 dL/L = dR/R where S is the local sectional area of the limb. It is then necessary to measure simultaneously R and dR, in order to eompute dL. The girth L can be measured directly. The mercury strain gauge plethysmographs generally use the Wheatstone bridge technique, either using direct current (1,11) or alternating current
Biomedizinische Technik / Biomedical Engineering – de Gruyter
Published: Jan 1, 1976
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