Peristaltic Pump

• US 20080131300A1
• Filed: 10/20/2005
• Published: 06/05/2008
• Est. Priority Date: 11/26/2004
• Status: Abandoned Application

• Current Assignee: Debiotech S.A.
• Original Assignee: Debiotech S.A.
• Inventors: Junod, Florent, Neftel, Frederic
• Application Number:
  US11/791,485
• Publication Number:
  US 20080131300A1
• Time in Patent Office: Days
• US Class Current: 417/476
• CPC Class Codes: F04B 2205/01 Pressure before the pump inlet
• CPC Class Codes: F04B 2205/05 Pressure after the pump outlet
• CPC Class Codes: F04B 43/1269 the rotary axes of the rollers lying in a plane perpendicular to the rotary axis of the driving motor
• CPC Class Codes: F04B 43/14 having plate-like flexible members

Abstract

Peristaltic pump comprising—a pump body (3) with a face containing at least a first groove (4) covered by a flexible membrane (2) fixed to said pump body (3), in such a way as to form a fluid tight channel, said membrane (2) furthermore comprising a sealing ridge (19) which is in permanent contact against said groove (4) so as to obtain a resting fluid tight sealing segment in the channel, —a movable pressure element (7) adapted to temporarily press a portion of the membrane (2) above said groove (4) and form a moving sealing segment in the channel, —driving means (8) adapted to move said movable pressure element (7) along said groove, said driving means (8) furthermore being adapted to move said movable pressure element (7) exclusively along a plane which is parallel to said pump body face, said sealing ridge (19) and/or said groove (4) being adapted to let said movable pressure element (7) in said parallel plane when moving over said sealing ridge (19), characterized by the fact that the movable pressure element (7) is rotatably fixed to an axis (9) forming part of said driving means (8), said axis (9) being parallel to the membrane (2).

Claims

1. Peristaltic pump comprising

a pump body (3) with a face containing at least a first groove (4) covered by a flexible membrane (2) fixed to said pump body (3), in such a way as to form a fluid tight channel, said membrane (2) furthermore comprising a sealing ridge (19) which is in permanent contact against said groove (4) so as to obtain a resting fluid tight sealing segment in the channel,

a movable pressure element (7) adapted to temporarily press a portion of the membrane (2) above said groove (4) and form a moving sealing segment in the channel,

driving means (8) adapted to move said movable pressure element (7) along said groove, said driving means (8) furthermore being adapted to move said movable pressure element (7) exclusively along a plane which is parallel to said pump body face, said sealing ridge (19) and/or said groove (4) being adapted to let said movable pressure element (7) in said parallel plane when moving over said sealing ridge (19), characterized by the fact that the movable pressure element (7) is rotatably fixed to an axis (9) forming part of said driving means (8), said axis (9) being parallel to the membrane (2).

2. Peristaltic pump according to claim 1 wherein said sealing ridge is made of an elastomeric material which allows said sealing ridge to collapse when compressed by the movable pressure element (7).

3. Peristaltic pump according to claim 1 wherein said groove (4) contains a zone of greater depth (17), said zone forming a part of said permanent fluid tight sealing segment and said sealing ridge (19) being designed to tightly fill said zone of greater depth (17).

4. Peristaltic pump according to claim 1 wherein said pump body face contains additional grooves (13,14) and wherein said membrane (2) contains additional ridges (11,12), said additional ridges (11,12) being designed to be located in said additional grooves (13,14) in order to tightly fix the membrane (2) to the pump body (3).

5. Peristaltic pump according to claim 1 wherein said first groove (4) forms a non-complete circle.

6. Peristaltic pump according to claim 1 wherein said first groove (4) forms a complete circle.

7. Peristaltic pump according to claim 6 wherein said first groove (4) contains a fluid inlet (10) and a fluid outlet (10), said permanent fluid tight sealing segment being located on the shortest distance separating said inlet (10) from said outlet (10).

8. Peristaltic pump according to claim 5 wherein said driving means (8) comprise a crown (15) with a diameter at least identical to the first groove diameter.

9. Peristaltic pump according to claim 8 wherein the crown (15) is adapted to be in close contact with the membrane (2) when the membrane is not pressed by said movable pressure element (7).

10. Peristaltic pump according to claim 1 comprising several movable pressure elements (7).

11. Peristaltic pump according to claim 10 wherein said movable pressure elements (7) are separated by a rigid element (16) which is in close contact with the membrane (2).

12. Peristaltic pump according to claim 11 wherein said rigid element (16) contains several smaller movable pressure elements such as balls adapted to freely rotate on the membrane (2) when the driving means (8) are activated.

13. Peristaltic pump according to claim 1 wherein said pump body face contains at least another cavity (21) forming part of an element such as a valve, a pressure sensor, a flow sensor or a hub chamber, said other cavity being also covered by the membrane (2).

14. Peristaltic pump according to claim 1 wherein said membrane (2) is tightly fixed to the pump body.

15. Peristaltic pump according to claim 1 furthermore comprising a pressure sensor located within the channel entry, said pressure sensor being connected to a flow compensating means in such a way that any pressure difference recorded by said pressure sensor would adapt the fluid flow accordingly.

16. Peristaltic pump according to claim 1 furthermore comprising a pressure sensor located within the channel exit, said pressure sensor being connected to a flow compensating means in such a way that any pressure difference recorded by said pressure sensor would adapt the fluid flow accordingly.

17. Peristaltic pump according to anyone of the previous means furthermore comprising a flow compensating means, based on membrane wear, which is adapted to automatically correct the fluid flow after a certain time and/or a certain number of pumping cycles.

18. Peristaltic pump according to anyone of the previous means wherein said movable pressure element is a ball (7).