Peristaltic pump

• US 5,380,173 A
• Filed: 09/20/1993
• Issued: 01/10/1995
• Est. Priority Date: 09/20/1993
• Status: Expired due to Fees

• Current Assignee: Cole-Parmer Instrument Company (Thermo Fisher Scientific Incorporated)
• Original Assignee: Cole-Parmer Instrument Company (Thermo Fisher Scientific Incorporated)
• Inventors: Hellstrom, Steven P.
• Primary Examiner(s): Bertsch, Richard A.
• Assistant Examiner(s): KOCHAROV, MICHAEL
• Application Number:
  US08/123,807
• Time in Patent Office: 477 Days
• Field of Search: 417/474, 417/477, 417/477 B, 417/477 J
• US Class Current: 417/477.3
• CPC Class Codes: F04B 43/1253 by using two or more rollers as squeezing elements, the rollers moving on an arc of a circle during squeezing

Abstract

A peristaltic pump constructed of a relatively small number of components so that performance and reliability criteria can be satisfied in a relatively economical and compact pump. In a preferred embodiment, the occlusion bed pivots about a pair of hinge pins integrally molded with the occlusion bed which are received in lugs integrally molded with the base of the pump. The occlusion bed also preferably includes an integral resiliently-biased latch member which cooperates with a latch plate integrally molded in the base of the pump. The pump preferably includes a rotor in which each of the roller support pins is molded integrally with one of the end plates. To secure tubing in place on the pump, a pair of cantilevered leaf springs urge tubing into slots on tubing retainer plates disposed adjacent the rotor. The roller pins and rollers may be made of a low friction composite material which eliminates the need for bearings therebetween.

Claims

1. A peristaltic pump comprising:

a base,

a rotor supported on said base, said rotor comprising a support structure and a plurality of rollers mounted thereon; and

an occlusion bed supported on said base so as to be pivotable about a fixed axis perpendicular to the axis of said rotor and adjacent said base between an open position in which said occlusion bed is spaced from said rotor by a relatively large distance to enable loading and unloading of tubing, and a closed position in which said occlusion bed is spaced from said rotor by a relatively small distance to enable peristaltic pumping upon rotation of said rotor, with only a minor angular displacement of said occlusion bed being needed to shift said occlusion bed between said open and closed positions;

wherein said occlusion bed is a one-piece structure comprising an integral latch lever, and wherein said base includes a latch plate for cooperation with said latch lever to provide a snap-action lock mechanism for selectively maintaining said occlusion bed in said closed position.

3. A peristaltic pump in accordance with claim 1 wherein said rotor support structure comprises a shaft and first and second end plates supported on said shaft, and a plurality of roller pins extending between said end plates for supporting said rollers, and wherein each of said roller pins is formed integrally with a respective one of said end plates.

2. A peristaltic pump comprising:

a base;

a rotor supported on said base, said rotor comprising a support structure and a plurality of rollers mounted thereon; and

an occlusion bed supported on said base so as to be movable between an open position in which said occlusion bed is spaced from said rotor by a relatively large distance to enable loading and unloading of tubing, and a closed position in which said occlusion bed is spaced from said rotor by a relatively small distance to enable peristaltic pumping upon rotation of said rotor wherein said occlusion bed is a one-piece structure comprising an integral latch lever, and wherein said base includes a latch plate for cooperation with said latch lever to provide a snap-action lock mechanism for selectively maintaining said occlusion bed in said closed position; and

wherein said occlusion bed comprises a one-piece injection-molded member having a pair of axially aligned hinge pins extending outward on opposite sides thereof, and wherein said base comprises a pair of slots for receiving said hinge pins.

4. A peristaltic pump comprising:

a base;

a rotor supported on said base, said rotor comprising a support structure and a plurality of rollers mounted thereon; and

an occlusion bed supported on said base so as to be movable between an open position in which said occlusion bed is spaced from said rotor by a relatively large distance to enable loading and unloading of tubing and a closed position in which said occlusion bed is spaced from said rotor by a relatively small distance to enable peristaltic pumping upon rotation of said rotor, said occlusion bed comprising a one-piece member having a pair of axially aligned hinge pins formed integral therewith extending outward on opposite sides thereof to provide a pivot axis for movement of said occlusion bed between said open position and said closed position.

5. A peristaltic pump in accordance with claim 4 wherein said base comprises a pair of lugs integrally formed therewith and defining slots for receiving said hinge pins.

6. A peristaltic pump in accordance with claim 5 wherein said rotor comprises a shaft supported for rotation on said base, first and second end plates fixed to said shaft for rotation therewith, a plurality of roller pins extending between said end plates, and a plurality of rollers supported for rotation on said roller pins, each of said roller pins being formed integrally with a respective one of said end plate, each of said roller pins being in direct contact with its respective associated roller, said roller pins and rollers being respectively formed of a low friction material to enable rotation of said rollers on said roller pins without the necessity of intermediate bearings for rotatable support.

7. A peristaltic pump comprising:

a base;

an occlusion bed supported on said base and comprising an occlusion surface; and

a rotor supported on said base, said rotor comprising a shaft, a pair of end plates disposed generally transversely of said shaft and fixed thereto for rotation therewith, a plurality of roller supports extending between said end plates, and a plurality of rollers supported on said roller supports;

wherein said rotor comprises a pair of identical pieces, each of said identical pieces comprising an end plate formed integrally with one-half of said roller supports.

8. A peristaltic pump in accordance with claim 7 wherein each of said rollers and each of said roller supports comprises a material having a low coefficient of friction, and wherein no bearings are employed to support said rollers for rotation on said roller supports.

9. A peristaltic pump comprising:

a base;

a rotor supported on said base, said rotor comprising a support structure and a plurality of rollers mounted thereon;

an occlusion bed providing an occlusion surface for cooperation with said rotors in effecting peristaltic pumping; and

a tubing retainer supported on said base, said tubing retainer comprising a wall having a plurality of slots therein for receiving tubing, and at least one cantilevered leaf spring having at least one end portion movable between a closed position for retaining tubing in position, and an open position for permitting loading and unloading of tubing, said leaf spring being biased toward said closed position, said leaf spring being positioned to engage said tubing when in said closed position to maintain said tubing in its desired position.

10. A peristaltic pump in accordance with claim 9 wherein said occlusion bed is supported on said base so as to be movable between an open position in which said occlusion bed is spaced from said rotor by a relatively large distance to enable loading and unloading of tubing, and a closed position in which said occlusion bed is spaced from said rotor by a relatively small distance to enable peristaltic pumping upon rotation of said rotor, said occlusion bed being a one-piece structure comprising an integral latch lever, said base including a latch plate for cooperation with said latch lever to provide a snap-action lock mechanism for selectively maintaining said occlusion bed in said closed position.

11. A peristaltic pump in accordance with claim 10 wherein said occlusion bed comprises a pair of integral axially aligned hinge pins extending outward on opposite sides thereof, and wherein said base includes a pair of integral lugs defining slots for receiving said hinge pins.

12. A peristaltic pump in accordance with claim 11 wherein said rotor support structure comprises a shaft and first and second end plates supported on said shaft, and a plurality of roller pins extending between said end plates for supporting said rollers, and wherein each of said roller pins is formed integrally with a respective one of said end plates.