Pump cassettes with piston and infusion pump systems

• US 10,293,102 B2
• Filed: 06/02/2015
• Issued: 05/21/2019
• Est. Priority Date: 12/01/2014
• Status: Active Grant

• Current Assignee: Carefusion 2200 Corporation (Becton, Dickinson & Co)
• Original Assignee: Carefusion 2200 Corporation (Becton, Dickinson & Co)
• Inventors: Magers, Corey Michael, Toro, Daniel, Abal, Daniel, Dodge, Santiago Roman, Vasko, Robert Steven, Browka, Edward
• Primary Examiner(s): Hayman, Imani N
• Assistant Examiner(s): Legette, Tiffany
• Application Number:
  US14/728,911
• Publication Number:
  US 20160151564A1
• Time in Patent Office: 1,449 Days
• CPC Class Codes: A61M 2205/12 with interchangeable cassettes forming partially or totally the fluid circuit
• CPC Class Codes: A61M 5/1452 pressurised by means of pistons
• CPC Class Codes: A61M 5/14586 pressurised by means of a flexible diaphragm
• CPC Class Codes: A61M 5/365 Air detectors A61M5/1684 takes precedence; in extracorporeal blood circuits A61M1/3626

Abstract

Pump cassettes, infusion systems, and methods are described. An example pump cassette may include a rigid body comprising a frame portion, a base portion, a compliant membrane disposed substantially therebetween, and two opposing longitudinal edge sections. The rigid body may include a controllable fluid pathway defined in part by the compliant membrane and extending from an inlet port to an outlet port. The pump cassette may include a piston disposed at least partially within the rigid body such that movement of the piston varies a volume of a pump chamber defined within the controllable fluid pathway.

Claims

1. A pump cassette comprising:

a rigid body comprising a frame portion, a base portion, a compliant membrane disposed substantially therebetween, and two opposing longitudinal edge sections, wherein the rigid body comprises a controllable fluid pathway defined in part by the compliant membrane and extending from an inlet port to an outlet port; and

a piston disposed at least partially within the rigid body such that movement of the piston varies a volume of a pump chamber defined within the controllable fluid pathway,

wherein the piston comprises a first seal that provides a sealed movable barrier of the pump chamber and a second seal that provides a sealed movable exterior-facing barrier,

wherein the first seal is disposed at a distance from the second seal that is longer than a stroke of the piston such that a first path of the first seal does not overlap a second path of the second seal.

2. The pump cassette of claim 1, wherein at least one of the base portion or the frame portion includes guiderails for prohibiting rotational movement of the piston within the rigid body.

3. The pump cassette of claim 1, further comprising a piston barrel in the rigid body, at least a portion of the piston barrel adjacent to and fluidly coupled with a portion of the fluid pathway, wherein the first seal is disposed in slidable contact with an internal wall of the piston barrel.

4. The pump cassette of claim 1, wherein the piston comprises a reduced tip portion comprising a frustoconical section having a smaller diameter proximal to a tip end of the piston and a larger diameter distal from the tip end.

5. The pump cassette of claim 1, wherein the piston is longitudinally moveable with respect to the rigid body and wherein the piston comprises an actuator-receiving portion.

6. The pump cassette of claim 5, wherein the actuator-receiving portion comprises opposing ramp portions and an elongate slot.

7. The pump cassette of claim 6, wherein the opposing ramp portions are disposed such that the opposing ramp portions angle downwardly towards the elongate slot with respect to an interface-facing side of the pump cassette.

8. The pump cassette of claim 7, wherein the elongate slot is arranged orthogonal to the movement of the piston.

9. The pump cassette of claim 1, wherein the first seal is disposed proximal to a tip end of the piston.

10. The pump cassette of claim 9, wherein the second seal is distal from the tip end with respect to the first seal.

11. The pump cassette of claim 10, wherein both the first seal and the second seal are circumferential.

12. The pump cassette of claim 11, wherein the piston comprises:

an actuator-receiving portion;

a center post extending from and integrally formed with the actuator-receiving portion; and

a sealing member disposed on the center post, wherein the first seal and the second seal are integral portions of the sealing member.

13. The pump cassette of claim 12, wherein the center post extends in a first direction from the actuator-receiving portion and wherein the center post comprises a plurality of protrusions extending in a direction perpendicular to the first direction from the center post at least partially into the sealing member.

14. An infusion pump system comprising:

a processing unit;

a cassette recess comprising;

a circularly moveable actuator mechanism disposed proximate to a back surface of the cassette recess and operably coupled to the processing unit, and

a plurality of cassette engagement slots,

wherein the cassette recess is adapted to receive a pump cassette comprising;

a rigid body comprising a frame portion, a base portion, a compliant membrane disposed substantially therebetween, and two opposing longitudinal edge sections, wherein the rigid body comprises a controllable fluid pathway defined in part by the compliant membrane and extending from an inlet port to an outlet port, and

a piston disposed at least partially within the rigid body such that movement of the piston varies a volume of a pump chamber defined within the controllable fluid pathway, wherein the piston comprises a first seal that provides a sealed movable barrier of the pump chamber and a second seal that provides a sealed movable exterior-facing barrier, wherein the first seal is disposed at a distance from the second seal that is longer than a stroke of the piston such that a first path of the first seal does not overlap a second path of the second seal.

15. The infusion pump system of claim 14, wherein the piston comprises an actuator-receiving portion such that when the pump cassette engages with the cassette recess, the actuator-receiving portion is sized and positioned to receive an actuator rod of the circularly moveable actuator mechanism for all positions of the actuator rod along a circular path.

16. The infusion pump system of claim 15, wherein the actuator-receiving portion comprises opposing ramp portions and an elongate slot having a width similar to a diameter of the actuator rod.

17. The infusion pump system of claim 15, wherein the actuator-receiving portion comprises guiderails for engaging with guideslots disposed on the rigid body.

18. The infusion pump system of claim 15, wherein first seal is proximal to a tip end of the piston, and wherein the second seal is distal from the tip end with respect to the first seal.