Adjustable finger cuff assembly for a blood pressure measurement device

A finger cuff apparatus for selective occlusion of finger blood vessels for measuring blood pressure by inflation and deflation of an air inflatable cylindrical finger cuff to alter the diameter of the cuff in response to air pressure applied to the cuff, the apparatus being adjustable to manually vary the diameter of the cuff to accommodate different diameter fingers;

• the apparatus comprising:
• an inflatable finger cuff having an air tube affixed to a source of controlled air pressure and wrapped into a cylindrical configuration within a pair of coaxial hollow rings of fixed diameters, one stationary and the other a rotatable ring;
• a pull-tab adhered to the finger cuff along its entire length and having a tab end extending beyond the finger cuff through a slit in the stationary ring and into a retaining member in said rotatable ring;
• wherein rotation of the rotatable hollow cylindrical ring relative to the stationary ring pulls or pushes said pull-tab to alter the shape of the finger cuff, both of said rings remaining unchanged relative to one another during the measurement of blood pressure.