Peristaltic pump tube loading assembly

• US 5,387,088 A
• Filed: 01/18/1994
• Issued: 02/07/1995
• Est. Priority Date: 01/18/1994
• Status: Expired due to Term

• Current Assignee: Haemonetics Corporation
• Original Assignee: Haemonetics Corporation
• Inventors: Sacco, Victor Jr., Loible, James R., Baruch, Nicholas D., Lanciano, Andrew P., Knapp, Tracey E.
• Primary Examiner(s): Gluck, Richard E.
• Assistant Examiner(s): KORYTNYK, PETER G
• Application Number:
  US08/183,483
• Time in Patent Office: 385 Days
• Field of Search: 417/474-477, 417/477 R
• US Class Current: 417/53
• 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 assembly for easy loading includes a pump housing having a curved surface. A stationary tubing manifold from which a loop of tubing extends is positioned in line with the curved surface. A pump rotor rotatable about an axis is positioned adjacent to the curved surface. The rotor has a groove located above the curved surface encircling the rotor for retaining and stretching the loop of tubing in loading position between the rotor and the manifold. During loading, a notch located on the rotor progressively captures and urges the tubing downward between the curved surface and the pump rotor when the rotor is rotated.

Claims

1. A peristaltic pump assembly comprising:

a loop of tubing;

a pump housing having a curved surface; and

a pump rotor extending along and rotatable about a longitudinal axis for progressively and intermittently compressing the loop of tubing against the curved surface, the pump rotor having a first portion extending beyond the housing along the longitudinal axis and concentric thereto and a second portion extending along the longitudinal axis adjacent to the curved surface of the housing, with a groove formed in the first rotor portion and a flange provided between the groove and second rotor portion, said groove encircling the rotor about the first rotor portion for retaining the loop of tubing opposite the curved surface, a notch in the flange extending between the groove and the second rotor portion which, as the rotor is rotated during loading, progressively captures the tubing to urge it downward between the curved surface and the second portion of the rotor.

2. The peristaltic pump assembly of claim 1 wherein the loop of tubing passes through a slot in the pump housing.

3. The peristaltic pump assembly of claim 1 further comprising a manifold mount for securing the tubing to the pump housing at the same elevational level as the curved surface.

4. The peristaltic pump assembly of claim 1 in which the notch includes a leading edge having an angled upper surface and a following edge having an angled lower surface.

5. The peristaltic pump assembly of claim 1 in which the second portion of the pump rotor further comprises a constant diameter roller for intermittently and progressively compressing the loop of tubing against the curved surface.

6. The peristaltic pump assembly of claim 1 further comprising a bushing encircling the groove for reducing friction between the tubing and the rotor.

7. A peristaltic pump assembly comprising:

a loop of tubing;

a pump housing having a curved surface; and

a pump rotor extending along and rotatable about a longitudinal axis for progressively and intermittently compressing the loop of tubing against the curved surface, the pump rotor having a first portion extending beyond the housing along the longitudinal axis and concentric thereto and a second portion extending along the longitudinal axis adjacent to the curved surface of the housing, the second portion including a constant diameter roller, a groove formed in the first rotor portion and a flange provided between the groove and second rotor portion, said groove encircling the rotor about the first rotor portion above the curved surface for retaining the loop of tubing opposite the curved surface, a notch in the flange extending between the groove and the second rotor portion which, as the rotor is rotated during loading, progressively captures the tubing to urge it downward between the curved surface and the second portion of the rotor.

8. The peristaltic pump assembly of claim 7 wherein the loop of tubing passes through a slot in the pump housing.

9. The peristaltic pump assembly of claim 7 further comprising a manifold mount for securing the tubing to the pump housing at the same elevational level as the curved surface.

10. The peristaltic pump assembly of claim 7 in which the notch includes a leading edge having an angled upper surface and a following edge having an angled lower surface.

11. The peristaltic pump assembly of claim 7 further comprising a bushing encircling the groove for reducing friction between the tubing and the rotor.

12. A method of loading tubing between a curved surface of a pump housing and a pump rotor extending beyond the housing along a longitudinal axis in a peristaltic pump, the pump rotor having a first portion extending along the longitudinal axis and concentric thereto and a second portion extending along the longitudinal axis adjacent to the curved surface of the housing, the method comprising the steps of:

retaining a loop of tubing opposite the curved surface with a groove formed in the first rotor portion, a flange being provided between the groove and the second portion, said groove encircling the pump rotor about the first rotor portion above the curved surface; and

rotating the pump rotor about the longitudinal axis to progressively capture the tubing with a notch in the flange extending between the groove and the second rotor portion to urge it downward between the curved surface and the second portion of the rotor.

13. The method of claim 12 further comprising the step of securing the tubing to the pump housing at the same elevational level as the curved surface with a tubing mount.

14. The method of claim 12 further comprising the step of providing slots in the pump housing for passing the loop of tubing through the pump housing.

15. The method of claim 12 in which the notch includes a leading edge having an angled upper surface and a following edge having an angled lower surface.

16. The method of claim 12 in which the second portion of the pump rotor has a constant diameter roller for intermittently and progressively compressing the loop of tubing against the curved surface.

17. The method of claim 12 further comprising the step of reducing friction between the tubing and the rotor with a bushing encircling the groove.