# US 9,518,576 B1 · Peristaltic pump

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- Number: US 9,518,576 B1
- Document ID: US9518576B1
- Status: Granted
- Kind: B1
- Application number: 13/184,120
- Filed: 2011-07-15
- Granted: 2016-12-13
- Earliest claimed: 2010-07-15
- Assignees: Elemental Scientific, Inc.
- Applicants: Daniel R. Wiederin; Gary J. Barret
- Inventors: Daniel R. Wiederin; Gary J. Barret
- Web page: https://patentgrep.com/patent/US9518576B1

## CPC

- F04B 43/1284: {Means for pushing the backing-plate against the tubular flexible member}
- A61M 5/14232: {Roller pumps}
- F04B 43/12: having peristaltic action
- F04B 43/1223: {the actuating elements, e.g. rollers, moving in a straight line during squeezing}
- F04B 43/1253: {by using two or more rollers as squeezing elements, the rollers moving on an arc of a circle during squeezing}
- F04B 43/1261: {the rollers being placed at the outside of the tubular flexible member}
- F04B 43/1292: {Pumps specially adapted for several tubular flexible members}
- F04B 43/1276: {Means for pushing the rollers against the tubular flexible member}
- F04B: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F)
- A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)}

## Abstract

A peristaltic pump includes a rotating member operably coupled to a drive. The rotating member includes a plurality of rollers arranged in a circular configuration. A guide member defines a channel configured to direct a peristaltic tube around the rotating member so that the peristaltic tube interfaces with the plurality of rollers. The peristaltic tube is pressed against the plurality of rollers by a retaining shoe. The retaining shoe contains surface irregularities configured to restrict movement of the peristaltic tube. A keeper braces the restraining shoe against the peristaltic tube. The rotating rollers compressing the peristaltic tube against the retaining shoe as the rotating member rotates results in a peristaltic action that produces a nearly pulse free linear flow.

## Claims

### Claim 1

A peristaltic pump, comprising:
a pump housing;
a drive disposed at least partially within the pump housing;
a rotating member operably coupled to the drive, the drive configured to rotate the rotating member about an axis;
a plurality of rollers coupled to the rotating member in a circular configuration, the plurality of rollers configured to orbit about the axis of the rotating member;
a guide member coupled to the pump housing, the guide member defining a channel configured to guide a peristaltic tube around the rotating member so that the peristaltic tube is in proximity to the plurality of rollers;
a retaining shoe pivotally coupled to the pump housing, the retaining shoe configured to press the peristaltic tube against the plurality of rollers, the retaining shoe comprising a plurality of surface irregularities, the plurality of surface irregularities configured to restrict movement of the peristaltic tube; and
a keeper coupled to the pump housing, the keeper configured to brace the retaining shoe against the peristaltic tube, wherein the keeper comprises an adjustment mechanism configured to brace the retaining shoe against the peristaltic tube by exerting a force on the retaining shoe opposite a pivot of the retaining shoe and in a direction generally toward the axis of the rotating member.

### Claim 2 (depends on 1)

The peristaltic pump as recited in claim 1, wherein the rotating member comprises a top plate and a bottom plate for supporting the plurality of rollers.

### Claim 3 (depends on 1)

The peristaltic pump as recited in claim 1, wherein the drive comprises a motor.

### Claim 4 (depends on 1)

The peristaltic pump as recited in claim 1, wherein the retaining shoe comprises an upper ridge and a lower ridge for retaining the peristaltic tube.

### Claim 5 (depends on 1)

The peristaltic pump as recited in claim 1, further comprising:
a second retaining shoe, the retaining shoe and the second retaining shoe coupled together.

### Claim 6 (depends on 5)

The peristaltic pump as recited in claim 5, wherein the retaining shoe and the second retaining shoe are coupled together with a rod extending at least partially through the retaining shoe and the second retaining shoe.

### Claim 7 (depends on 1)

The peristaltic pump as recited in claim 1, wherein the retaining shoe defines a receiver for receiving the keeper.