Peristaltic pump having variable occlusion rates
First Claim
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.
5 Assignments
0 Petitions
Accused Products
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.
27 Citations
5 Claims
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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:
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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. - View Dependent Claims (2, 3, 4)
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5. A peristaltic pump having a variable occlusion path to dissipate heat due to tube occlusion stresses comprising:
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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 unitary reaction member mounted on said housing for swinging about a pivot axis and having a reaction surface of substantial uniform radius adapted to at least partially encircle the circular path traveled by said at least three compression rollers, a fixed pivot means pivotally mounting the reaction member at one end adjacent an inlet side of the pump and defining the pivot axis and variable occlusion path for the reaction member, a compressible flow tube interposed between said rotor and said reaction surface and adapted to be partially occluded by said compression rollers during movement through said circular path and means including cam control means mounting said reaction member on said housing and being adjustable to move said reaction member between a starting position wherein said reaction surface is substantially concentric with said circular path and a position wherein said reaction surface is eccentric to said circular path so as to enable selective variation in the occlusion rate of said tube by said compression rollers as they traverse said circular path, said reaction surface extending about said rotor so as to encircle approximately 270°
of the circular path traversed by said rollers, said reaction surface cooperating with said compressible tube and said compression rollers to define an arcuate region of partial occlusion of said tube during each revolution of said compression rollers with said reaction surface concentric with said circular path, said control means being operative to move said reaction member about its pivot axis to a position wherein said reaction surface is eccentric to said circular path and establishes during each revolution of said compression rollers a first arcuate region of approximately 90°
of progressively increasing occlusions to a fixed point of maximum occlusion approximately 90°
from the inlet portion of the flow tube, followed by a second arcuate region of approximately 90°
of progressively decreasing occlusions followed by a third arcuate region of approximately 90°
in which occlusion of said tube is progressively reduced to zero adjacent the outlet portion of the flow tube said cam control means including a lever handle mounted to turn the cam means with movement of the lever handle to swing the reaction member about its fixed axis and to vary the occlusion rate of the tube.
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Specification