Importance

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Abstract

A peristaltic pump of the type having a housing, a rotor mounted on the housing and adapted for rotation about its longitudinal axis and carrying at least two compression rollers for movement in a circular path, a reaction member mounted on the housing and having a reaction surface adapted to at least partially encircle the circular path traversed by the compression rollers, and a compressible tube interposed between the rotor and reaction surface so that the compression rollers effect a peristaltic pumping action on the tube during rotation. The reaction member preferably extends approximately 270 degrees about the circular path of the compression rollers and is mounted on the housing through cam control means which enables adjustment of the reaction surface between a position concentric with the rotor and positions eccentric to the circular path of the rollers so as to effect variation in the rate of occlusion of the tube in a manner to obtain reduced thermal degradation of the tube and thereby prolong tube life.

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First Claim