초록 ▼

To increase precision of flow in multiple channels of a peristaltic pump, a plurality of spring biased cassettes are mounted to cooperate with a spool having a plurality of elongated rollers which orbit about its center so that each elongated roller in succession compresses a plurality of flexible t

To increase precision of flow in multiple channels of a peristaltic pump, a plurality of spring biased cassettes are mounted to cooperate with a spool having a plurality of elongated rollers which orbit about its center so that each elongated roller in succession compresses a plurality of flexible tubes in the channels against corresponding cam surfaces in the cassettes, spaced from the rollers by surfaces of the cassettes which are in contact with the rolles. In each cassette, the cam is mounted between side plates against which the rollers roll, which are spring biased against the rollers and hinged at a center location to provide precision determined only by the precision of the cam to side plate edge dimension. The cam is shaped to reduce pulses during roller lift-off from the cam surface to provide for pulse-free flow.

대표청구항 ▼

A method of pumping comprising the steps of: orbiting a plurality of rollers about a drive shaft in a circular orbit; positioning each of a plurality of flexible tubes in a corresponding one of a plurality of tube supports against a corresponding cam surface wherein each of the tube supports has mou

A method of pumping comprising the steps of: orbiting a plurality of rollers about a drive shaft in a circular orbit; positioning each of a plurality of flexible tubes in a corresponding one of a plurality of tube supports against a corresponding cam surface wherein each of the tube supports has mounted to it a corresponding guide surface spaced a programmed distance from the cam surface; resiliently mounting at least some of said guide surfaces against said rollers independently from the other guide surfaces wherein said tubes are compressed to a programmed degree along their lengths and said at least some of said guide surfaces are movable with respect to other of said guide surfaces during pumping.