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Peristaltic pump having variable occlusion rates

  • US 4,519,754 A
  • Filed: 11/17/1983
  • Issued: 05/28/1985
  • Est. Priority Date: 09/29/1981
  • Status: Expired due to Fees
First Claim
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1. A peristaltic pump having a fixed variable occlusion path and adapted to selectively vary the occlusion rate to cause dissipation of heat due to tube deformation stresses comprising:

  • a housing;

    a rotor mounted on said housing and adapted for rotation about its longitudinal axis, at least three compression rollers carried by said rotor for movement in a circular path during rotation of said rotor, a reaction member mounted on said housing and having a reaction surface of substantial uniform radius adapted to partially encircle about 270°

    of the circular path traveled by said at least three compression rollers, a compressible flow tube interposed between said rotor and said reaction surface and adapted to be occluded by said compression rollers during movement through said circular path, said tube having an inlet end and having an outlet end from which the fluid flows;

    pivot means for pivotally mounting one terminal end of the reaction member to the housing at a fixed pivot axis for pivotal movement about the fixed axis adjacent the inlet end of the flow tube;

    cam means connected to opposite reaction member terminal end and being adjustable to move the reaction surface of the reaction member about the pivot means toward the compression rollers to cause a progressively increasing occlusion of the tube from the beginning of the reaction surface in a first zone of approximately 90°

    to a fixed point of maximum occlusion, a second zone of decreasing occlusion extending from the fixed point of maximum occlusion through a central portion of the reaction member, and a third zone decreasing to substantially zero occlusion extending to the outlet end of the reaction member;

    said cam means and said pivot means being releasably mounted on said housing to permit axial removal of the reaction member relative to the rotor to permit tube replacement.

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