Patent ID: 6106249
Filing Date: 2000-08-22
Classification: A61M,F04B

Abstract:
A peristaltic pump for propelling liquid through a flexible tube segment, the pump comprising:a cam shaft carrying a plurality of cams each having a driving surface, the driving surfaces of adjacent cams being spaced at an angle to each other about the cam shaft;a plurality of cam followers which are each reciprocal in a common direction perpendicular to the axis of the cam shaft, each cam follower having a cam surface riding on the driving surface of a cam and a tube engaging surface for engaging the flexible tube segment, at least one of the cam followers being a restriction cam follower of which the tube engaging surface engages the flexible tube segment for a longer period than that of the other cam followers; anda motor for rotating the cam shaft whereby the cams cause the cam followers to each engage and occlude the flexible tube segment to form a propagating depression wave in the flexible tube segment for propelling liquid; the restriction cam followers preventing back flow of the liquid.