Non-invasive detector of variations in blood vol. or pressure - uses microprocessor and electronic pump controller for computation and display of incremental volume of exercised limb

摘要

Air is pumped (8) through a valve (7) and pneumatic coupler (4) into a cuff at a basic pressure of 10 to 20 torr. An electronic controller (10) instigates additional pumping during one or more short intervals while the consequent increase in pressure is measured by a sensor (S) calibrated in millilitres from knowledge of the pump vol. and air compressibility and temp. The controller calculates the enclosed tissue vol. at rest so that the measured changes in vol. can be expressed also in percentage terms when the limb (E) is exercised. USE/ADVANTAGE - Variations in vol. of extremities or of pressure in a subcutaneous vessel during exercise can be evaluated in both relative and absolute units.