Patent ID: 8308456
Filing Date: 2012-11-13
Classification: F04B

Abstract:
1. A pump finger/cam assembly for use in a finger-type peristaltic pump wherein a plurality of fingers sequentially compress and decompress a pump tube against a platen thereby causing peristaltic movement of fluid through the pump tube, said pump finger/cam assembly comprising: a cam having a concaved race formed therein, said cam rotating about an axis of cam rotation; a plurality of fingers, each finger defining an aperture and including: (i) a tube-compressing surface at one end, (ii) a roller at the other end, and (iii) a pin, each finger operable with a retraction apparatus, each retraction apparatus including a spring that includes a hooked end, the spring held in position by the pin, the hooked end of the spring (a) extending through the aperture defined in the finger and (b) configured to engage an aperture in the peristaltic pump, and wherein each retraction apparatus biases the finger toward the cam, said roller being rotatable about an axis of roller rotation; and said roller riding rotatably within the race of the cam such that the axis of roller rotation is substantially perpendicular to the axis of cam rotation.