Hose cassette for a peristaltic pump

• US 20010004444A1
• Filed: 12/14/2000
• Published: 06/21/2001
• Est. Priority Date: 12/15/1999
• Status: Active Grant

• Current Assignee: Christian Haser, Gotthilf Mehner, Peter Zentner
• Original Assignee: Christian Haser, Gotthilf Mehner, Peter Zentner
• Inventors: Haser, Christian, Zentner, Peter, Mehner, Gotthilf
• Granted Patent: US 6,468,059 B2
• Time in Patent Office: Days
• US Class Current: 417/477.2
• CPC Class Codes: A61M 1/72 Cassettes forming partially or totally the fluid circuit
• CPC Class Codes: A61M 1/82 Membrane pumps, e.g. bulbs
• CPC Class Codes: A61M 2205/12 with interchangeable cassettes forming partially or totally the fluid circuit
• CPC Class Codes: A61M 3/0201 Cassettes therefor
• CPC Class Codes: A61M 3/0258 by means of electric pumps
• CPC Class Codes: A61M 5/14228 with linear peristaltic action, i.e. comprising at least three pressurising members or a helical member
• 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 hose cassette (1), for a peristaltic pump (2), includes a cassette housing (3) and a flexible hose (4) extending through cassette housing (3). The hose (4) is guided in the cassette housing (3) along a circular segment. The cassette housing (3) has a cutout (5) for the engagement of a roller wheel (6) of a peristaltic to pump (2) into the interior of said circular segment. The hose cassette has connection elements (7), (8) for connecting the cassette housing (3) to the peristaltic pump (2). At least one hose leg (9), (10) to be connected to the circular segment is displaceably held between a mounting position and an operating position in the cassette housing (3).

Claims

1. A hose cassette (1) for a peristaltic pump (2), comprising a cassette housing (3), a flexible hose (4) extending through cassette housing (3), hose (4) being guided in cassette housing (3) along a circular segment and cassette housing (3) having a cutout (5) for the engagement of a roller wheel (6) of peristaltic pump (2) into the interior of said circular segment, and comprising connection elements (7), (8) for connecting cassette housing (3) to peristaltic pump (2),

characterized in that at least one hose leg (9), (10) to be connected to said circular segment is displaceably held between a mounting position and an operating position in cassette housing (3).

2. A hose cassette (1) according to

claim 1

, characterized in that the operating position is adjustable by that, for a cassette (1) mounted at a peristaltic pump (2), the displaceable hose leg (10) is adjustable by pulling at hose portion (11) being immediately adjacent to displaceable hose leg (10) and, arranged outside the cassette, displaceable hose leg (10) latching in the operating position.

3. A hose cassette (1) according to

claim 1

or

2

, characterized in that only one hose leg (10) is displaceable between the mounting position and the operating position, and that the other hose leg (9) is fixed in the longitudinal direction of hose end (4).

4. A hose cassette (1) according to one of

claims 1

to

3

, characterized in that the circular element extends over at least 90°

, preferably 170°

to 190°

, most preferably 180°

.

5. A hose cassette (1) according to one of

claims 1

to

4

, characterized in that hose (4) is formed at least in the area of the circular segment from a rubber-elastic material, in particular a natural or synthetic elastomer material, preferably a silicone caoutchouc or an elastomer polyurethane-(co)polymer.

6. A hose cassette (1) according to one of

claims 1

to

5

, characterized in that fixed hose leg (9) comprises a connection element (12) having stop surfaces (13) preferably extending orthogonally to the longitudinal extension of hose (4), said stop surfaces (13) resting against fixing surfaces (14) in cassette housing (2).

7. A hose cassette (1) according to one of

claims 1

to

6

, characterized in that connection element (12) of fixed hose leg (9) comprises a pressure sensor (15) communicating with peristaltic pump (1), for a cassette (1) mounted at peristaltic pump (2).

8. A hose cassette (1) according to one of

claims 1

to

7

, characterized in that displaceable hose leg (10) comprises a connection element (16) with a latch element.

9. A hose cassette (1) according to one of

claims 1

to

8

, characterized in that the latch element has a stop surface (17), by means of which for a cassette (1) mounted at peristaltic pump (2), a locking element (18) provided at peristaltic pump (2) can be lifted, during the displacement of displaceable hose leg (10), from the mounting position into the operating position against spring pressure from a locking position, and that the latch element comprises adjacent to stop surface (17) a blocking surface (19) in the direction of the operating position, the locking element (18) engaging in its locking position behind said blocking surface.

10. A hose cassette (1) according to one of

claims 1

to

9

, characterized in that locking element (18) is configured as a locking pin (18).

11. A hose cassette (1) according to one of

claims 1

to

10

, characterized in that hose (4), possibly together with connection elements (12, 16), can be removed from cassette housing (3).

12. A hose cassette (1) according to one of

claims 1

to

11

, characterized in that cassette housing (3) has a substantially half-oval shape with two plane half-oval surfaces, one half-oval surface being closed and the opposite half-oval surface being open and comprising cutout (5) for engagement of roller wheel (6).

13. A hose cassette (1) according to one of

claims 1

to

12

, characterized in that at least one positive-drive cutout (7) is provided at a wall (20) being orthogonal to said half-oval surfaces, and that spaced to positive-drive cutout (7), in relation to wall (20), at least one friction-drive element (8) is provided, by means of friction-drive element (8) a releasable connection to peristaltic pump (2) being achieved by moving friction-drive element (8) in a direction being parallel to wall (20).

14. A peristaltic pump (2) comprising a pump housing (21), a roller wheel (6) projecting over an outside wall (22) of pump housing (21), and comprising a hose cassette (1) according to one of

claims 1

to

13

, wherein connection elements (23, 24) being complementary to connection elements (7, 8) of the cassette are provided at outside wall (22).

15. A peristaltic pump (1) according to

claim 14

, wherein pressure sensor (15) is configured as a pressure chamber with a pressure membrane (15), and a pressure transducer (25) is mounted at pump housing (21) such that with mounted cassette (11). pressure membrane (15) will rest against pressure transducer (25).