Importance

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Abstract

A back pressure sensor comprising a flexible beam having a pivot end with a pivot pin and a drive connector end with a means for engaging a pump drive. A pump actuator is connected to the flexible beam at a position intermediate the ends and connects with a positive displacement pumping member. A sensor beam is attached to the flexible beam at a connecting point spaced from said pivot end. A first capacitor plate is mounted on the flexible beam at a point which is spaced from the connecting point. A second capacitor plate is mounted on the sensor beam in a position facing and spaced apart from the first capacitor plate at a distance therefrom which permits formation of a capacitance coupling therebetween. The back pressure sensor is particularly advantageous for use with positive displacement pumps such as diaphragm pumps, peristaltic pumps and piston pumps used in parenteral solution delivery systems where substantially increases in back pressure present a hazard to the patient to which liquid is being infused.

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First Claim