Peristaltic pump module having jaws for gripping a peristaltic pump tube cassett

• US 5,480,294 A
• Filed: 12/22/1993
• Issued: 01/02/1996
• Est. Priority Date: 12/22/1993
• Status: Expired due to Term

• Current Assignee: Fenwal Incorporated (Fresenius SE & Co. KGaA)
• Original Assignee: Baxter International Inc.
• Inventors: West, Richard L., Di Perna, Paul M.
• Primary Examiner(s): Bertsch, Richard A.
• Assistant Examiner(s): Korytnyk, Peter G.
• Application Number:
  US08/172,654
• Time in Patent Office: 741 Days
• Field of Search: 417/474, 417/475, 417/476, 417/477 R, 417/477 A, 417/477 F, 417/477 G, 417/477 E, 417/477.1, 417/477, 417/2, 417/477.7, 417/477.8, 417/477.6, 604/153
• US Class Current: 417/477.2
• CPC Class Codes: A61M 1/30 Single needle dialysis ; Reciprocating systems, alternately withdrawing blood from and returning it to the patient, e.g. single-lumen-needle dialysis or single needle systems for hemofiltration or pheresis
• CPC Class Codes: A61M 1/303 having a reservoir for treated blood to be returned
• CPC Class Codes: A61M 1/36222 Details related to the interface between cassette and machine
• CPC Class Codes: A61M 1/362227 the interface providing means for actuating on functional elements of the cassette, e.g. plungers
• CPC Class Codes: A61M 1/36224 with sensing means or components thereof
• CPC Class Codes: A61M 1/36225 with blood pumping means or components thereof
• CPC Class Codes: A61M 1/362261 at least one cassette surface or portion thereof being flexible, e.g. the cassette having a rigid base portion with preformed channels and being covered with a foil
• CPC Class Codes: A61M 1/362265 Details of valves
• CPC Class Codes: A61M 1/362266 Means for adding solutions or substances to the blood
• CPC Class Codes: A61M 1/3693 using separation based on different densities of components, e.g. centrifuging
• CPC Class Codes: A61M 1/3696 with means for adding or withdrawing liquid substances during the centrifugation, e.g. continuous centrifugation
• CPC Class Codes: A61M 2205/12 with interchangeable cassettes forming partially or totally the fluid circuit
• CPC Class Codes: F02B 2075/025 two
• 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 pumping apparatus includes a peristaltic pump rotor and pump race. A pump tube cassette includes a body for supporting a flexible tubing loop in an erect, outwardly bowed position for placement within the pump race and for removal from the pump race. A surface juxtaposed the peristaltic pump rotor and race carries a gripping jaw assembly. The gripping jaw assembly opens to receive the pump tube cassette body as the body is moved toward the pump rotor to place the tubing loop within the pump race. The gripping jaw assembly closes to secure the pump tube holder body on the surface in an orientation in which the tubing loop lies within the pump race for engagement with the peristaltic pump rotor.

Claims

1. A peristaltic pumping apparatus comprising

a peristaltic pumping element including a pump rotor rotatable about a rotational axis and a pump race circumferentially spaced about the axis,

a pump tube cassette including a body having a side edge and means on the side edge for supporting a flexible tubing loop in an erect, outwardly bowed position generally perpendicular to the side edge for placement within the pump race and for removal from the pump race by moving the body and the tubing loop, respectively, toward and away from the pumping element in a direction generally parallel to the rotational axis of the pump rotor, and

a surface spaced from the peristaltic pumping element in a plane that extends generally perpendicular to the rotational axis, including a gripping jaw assembly on the surface that opens to receive the pump tube cassette body as the body and the tubing loop are moved in the generally parallel direction toward the pumping element to place the tubing loop within the pump race and that closes against the pump tube cassette body to secure the pump tube cassette body on the surface in an orientation in which the tubing loop lies within the pump race for engagement with the peristaltic pump rotor.

2. An apparatus according to claim 1

wherein the gripping jaw assembly opens to release the pump tube cassette body as the body and the tubing loop are moved in the generally parallel direction away from the pumping element to remove the tubing loop from the pump race.

3. An apparatus according to claim 1

and further including means for releasably locking the gripping jaw assembly when closed.

4. A peristaltic pumping apparatus comprising

a peristaltic pumping element including first and second pump rotors, each including a pump race, the first and second pump rotors rotating about, respectively, first and second generally parallel rotational axes, the pump race for each pump rotor being circumferentially spaced about the respective one of the first and second rotational axes, the first and second pump rotors being spaced apart by a surface that extends generally perpendicular to the rotational axes,

a pump tube cassette including a body having first and second oppositely spaced side edges and means on the first and second side edges for supporting, respectively, first and second flexible tubing loops in an erect, outwardly bowed position generally perpendicular to the respective side edge for placement, respectively, within the pump races of the first and second pump rotors and for removal from the respective pump races by moving the body and the first and second tubing loops, respectively, toward and away from the pumping element in a direction generally parallel to the first and second rotational axis, and

the surface between the first and second pump rotors including a gripping jaw assembly that opens to receive the pump tube cassette body as the body and the first and second tubing loops are moved in the generally parallel direction toward the pumping element to place the first and second tubing loops within their respective pump races and that closes against the pump tube cassette body to secure the pump tube cassette body on the surface in an orientation in which the first and second tubing loops lie within their respective pump races for engagement with the respective peristaltic pump rotors.

5. An apparatus according to claim 4

wherein the gripping jaw assembly opens to release the pump tube cassette body as the body and the first and second tubing loops are moved in the generally parallel direction away from the pumping element to remove the first and second tubing loops from their respective pump races.

6. An apparatus according to claim 4

and further including means for releasably locking the gripping jaw assembly when closed.

7. A peristaltic pumping apparatus comprising

a peristaltic pumping element including a pump rotor and pump race,

a pump tube cassette including a body and means on the body for supporting a flexible tubing loop in an erect, outwardly bowed position for placement within the pump race and for removal from the pump race by moving the body, respectively, toward and away from the pumping element,

a surface juxtaposed the peristaltic pumping element including first and second gripping elements, each movable between a mutually open position to receive between them the pump tube cassette body and a mutually closed position gripping the pump tube cassette body to secure it on the surface, and the gripping elements being movable toward the mutually open position in response to movement of the body toward the surface to place the tubing loop within the pump race and movable toward the mutually closed position when the body rests on the surface in an orientation in which the tubing loop lies within the pump race for engagement with the peristaltic pump rotor, and

a locking mechanism that releasable holds the gripping elements in the mutually closed position including an electrically actuated solenoid selectively moveable into contact with at least one of the gripping elements to hold the gripping element in the mutually closed position.

8. An assembly according to claim 7

wherein the locking mechanism includes a manually actuated release.

9. A peristaltic pumping apparatus comprising

a peristaltic pumping element including a pump rotor and pump race,

a pump tube cassette including a body and means on the body for supporting a flexible tubing loop in an erect, outwardly bowed position for placement within the pump race and for removal from the pump race by moving the body, respectively, toward and away from the pumping element,

a surface juxtaposed the peristaltic pumping element including first and second gripping elements, each movable between a mutually open position to receive between them the pump tube cassette body and a mutually closed position gripping the pump tube cassette body to secure it on the surface, and a gripping mechanism for moving the gripping elements toward the mutually open position in response to movement of the body toward the surface to place the tubing loop within the pump race and for moving the gripping element toward the mutually closed position when the body rests on the surface in an orientation in which the tubing loop lies within the pump race for engagement with the peristaltic pump rotor, and

a locking mechanism that releasable holds the gripping elements in the mutually closed position including an electrically actuated solenoid selectively moveable into contact with at least one of the gripping elements to hold the gripping element in the mutually closed position.

10. An assembly according to claim 9

wherein the locking mechanism includes a manually actuated release.

11. An assembly according to claim 9

wherein the gripping mechanism includes a spring element for biasing the gripping elements toward the mutually closed position.

12. An assembly according to claim 9

wherein the gripping mechanism moves the gripping element toward the mutually open position in response to contact with the pump tube cassette body during movement toward the surface.

13. An assembly according to claim 12

wherein the gripping mechanism includes a detent surface that relieves the contact when the pump tube cassette body is adjacent the surface.

14. An assembly according to claim 13

wherein the gripping mechanism includes a spring element to move the gripping elements toward the mutually closed position in the absence of the contact.

15. An assembly according to claim 9

wherein the gripping mechanism moves the gripping elements toward the mutually open position in response to movement of the pump tube cassette body away from the surface to remove the tubing loop from the pump race.

16. An assembly according to claim 15

wherein the gripping mechanism moves the gripping element toward the mutually open position in response to contact with the pump tube cassette body during movement away from the surface.

17. An assembly according to claim 16

wherein the gripping mechanism includes a detent surface that relieves the contact when the pump tube cassette body is spaced a predetermined distance from the surface.

18. An assembly according to claim 17

wherein the gripping mechanism includes a spring element that moves the gripping elements toward the mutually closed position in the absence of the contact.