Curvilinear peristaltic pump
First Claim
1. A curvilinear peristaltic pump which comprises:
- a curved, concave, platen;
a rotatable cam spaced from said platen;
means for rotating said cam in a first direction;
a plurality of pump fingers, each having a first end riding on said cam and a second end adjacent to said platen;
guide means for axially guiding said pump fingers in radial directions;
said cam configured to first sequentially move said pump fingers toward said platen and second sequentially allow said pump fingers to move away from said platen;
each of said pump fingers having a pinch finger extending beyond said second end, transversely across second end;
whereby a resilient tube may be interposed between said platen and said second pump finger ends so that as said pump fingers are sequentially moved toward said platen, liquid in said tube will be pumped in said first cam rotation direction and each pinch finger will occlude said tube when each said pump finger reaches a position closest to said platen.
7 Assignments
0 Petitions
Accused Products
Abstract
A curvilinear peristaltic pump for pumping liquids through a resilient tube. The pump includes a curved concave platen against which a resilient tube is placed. A multi lobed cam is positioned adjacent to the platen and tube. A plurality of pump fingers are mounted between the tube and cam in a manner permitting radial movement of the pump fingers. As the cam rotates, the fingers are pressed toward the tube sequentially so as to pump liquid through the tube. The lobe end presses the tube sufficiently to occlude the tube and prevent back flow without over pressing and damaging the tube. A transverse pinch finger is provided on each pump finger, extending from the tube pressing face of each pump finger. At the tube occluding position, the pump finger nearly occludes the tube and the pinch finger completes occlusion without pressing the tube beyond the fully occluded position. A fixed or slidable spring pressed pinch finger may be used.
114 Citations
20 Claims
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1. A curvilinear peristaltic pump which comprises:
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a curved, concave, platen; a rotatable cam spaced from said platen; means for rotating said cam in a first direction; a plurality of pump fingers, each having a first end riding on said cam and a second end adjacent to said platen; guide means for axially guiding said pump fingers in radial directions; said cam configured to first sequentially move said pump fingers toward said platen and second sequentially allow said pump fingers to move away from said platen; each of said pump fingers having a pinch finger extending beyond said second end, transversely across second end; whereby a resilient tube may be interposed between said platen and said second pump finger ends so that as said pump fingers are sequentially moved toward said platen, liquid in said tube will be pumped in said first cam rotation direction and each pinch finger will occlude said tube when each said pump finger reaches a position closest to said platen. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A curvilinear peristaltic pump which comprises:
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a curved, concave, platen; a rotatable multi-lobed cam spaced from said platen; means for rotating said cam in a first direction; a plurality of pump fingers, each having a first end riding on said cam and a second end adjacent to said platen; guide means for axially guiding said pump fingers in radial directions from a center of rotation of said cam; a resilient tube interposed between said platen and said pump fingers; said cam configured to first sequentially move said pump fingers toward said platen to compress said tube and second sequentially allow said pump fingers to be moved away from said platen by tube resiliency; each of said pump fingers sized to compress said tube as said cam moves said pump fingers forward said platen but not fully occlude said tube; and each of said pump fingers having a pinch finger extending transversely beyond said pump finger second end to fully occlude said tube as said cam moves said pump fingers toward said platen. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification