Pump, motor and assembly for beneficial agent delivery

• US 10,232,111 B2
• Filed: 12/30/2014
• Issued: 03/19/2019
• Est. Priority Date: 12/31/2013
• Status: Active Grant

• Current Assignee: Abbvie Incorporated
• Original Assignee: Abbvie Incorporated
• Inventors: Anderson, Phil D., Dhami, Gurjinder, Smieja, Scott
• Primary Examiner(s): Freay, Charles G
• Application Number:
  US14/586,923
• Publication Number:
  US 20150184648A1
• Time in Patent Office: 1,540 Days
• Field of Search: 417474, 417479
• CPC Class Codes: A61M 2005/16863 Occlusion detection
• CPC Class Codes: A61M 2205/12 with interchangeable cassettes forming partially or totally the fluid circuit
• CPC Class Codes: A61M 2205/14 Detection of the presence or absence of a tube, a connector or a container in an apparatus
• CPC Class Codes: A61M 2205/16 with back-up system in case of failure
• CPC Class Codes: A61M 2205/50 with microprocessors or computers
• CPC Class Codes: A61M 2205/502 User interfaces, e.g. screens or keyboards
• CPC Class Codes: A61M 2205/6054 Magnetic identification systems
• CPC Class Codes: A61M 5/142 Pressure infusion, e.g. using 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: A61M 5/14244 adapted to be carried by the patient, e.g. portable on the body
• CPC Class Codes: A61M 5/16831 Monitoring, detecting, signalling or eliminating infusion flow anomalies low-level float-valves causing cut-off A61M5/40; indicating or recording presence, absence or direction of flow in general G01P13/0066
• CPC Class Codes: F04B 43/082 the tubular flexible member being pressed against a wall by a number of elements, each having an alternating movement in a direction perpendicular to the axes of the tubular member and each having its own driving mechanism
• CPC Class Codes: F04B 43/12 having peristaltic action
• CPC Class Codes: F04B 43/1223 the actuating elements, e.g. rollers, moving in a straight line during squeezing

Abstract

Pump includes a motor and a cam shaft coupled to the motor for rotation about a longitudinal axis of the cam shaft. The cam shaft has at least one radially-outward projection defining a helical engagement portion disposed along a length of the cam shaft. A plurality of finger plates are disposed along the length of the cam shaft, each finger plate mounted for movement in a transverse direction relative to the longitudinal axis of the cam shaft. Each finger plate has an aperture defined therein to receive the cam shaft therethrough. Each aperture has a substantially straight edge region and an opposing edge region. Engagement of the helical engagement portion with the substantially flat edge region during rotation of the cam shaft urges the finger plate transversely toward an extended position.

Claims

1. A peristaltic pump for delivery of a beneficial agent to a user, comprising:

a motor;

a cam shaft coupled to the motor for rotation about a longitudinal axis of the cam shaft, the cam shaft having a radially-outward projection defining a helical engagement portion disposed continuously along a length of the cam shaft; and

a plurality of finger plates disposed along the length of the cam shaft, each finger plate mounted for movement in a transverse direction relative to the longitudinal axis of the cam shaft, each finger plate having an aperture defined therein to receive the cam shaft therethrough, each aperture defined by a substantially straight edge region and an opposing edge region, each finger plate further having a substantially flat surface contacting an adjacent finger plate and a recessed area within and surrounded by the surface, the recessed area being configured to reduce surface friction between the contacting surfaces of the adjacent finger plates;

wherein engagement of the helical engagement portion with the substantially straight edge region of each finger plate during rotation of the cam shaft urges the finger plate transversely toward an extended position.

2. The peristaltic pump of claim 1, wherein each finger plate is free of transverse movement as the helical engagement portion passes along at least a portion of the opposing edge region thereof during rotation of the cam shaft.

3. The peristaltic pump of claim 1, wherein the opposing edge region comprises an arcuate edge.

4. The peristaltic pump of claim 1, wherein the recessed area is disposed proximate the aperture of the finger plate.

5. The peristaltic pump of claim 1, wherein the recessed area is recessed 0.1 mm relative the surface of the finger plate.

6. The peristaltic pump of claim 1, wherein each finger plate comprises an end surface at an end facing the direction of the transverse movement, and wherein the recessed area is spaced from the end surface.

7. The peristaltic pump of claim 1, wherein each finger plate comprises an end surface at an end facing the direction of the transverse movement, and wherein the end surfaces of the finger plates together define a contiguous surface facing the direction of the transverse movement.

8. The peristaltic pump of claim 1, wherein each finger plate is unbiased.

9. The peristaltic pump of claim 1, wherein each finger plate is biased away from the extended position.

10. The peristaltic pump of claim 1, wherein the plurality of finger plates are disposed parallel with each other and arranged for sequential movement toward the extended position.

11. The peristaltic pump of claim 1, further comprising a gap defined between an end plate of the plurality of finger plates and an interior wall of the peristaltic pump, the peristaltic pump further comprising a filler plate disposed within the gap.

12. The peristaltic pump of claim 11, wherein the filler plate has a different thickness than each of the plurality of finger plates, the different thickness being less than each of the plurality of finger plates.

13. The peristaltic pump of claim 11, wherein the filler plate has a different thickness than each of the plurality of finger plates, the different thickness being greater than each of the plurality of finger plates.

14. The peristaltic pump of claim 1, wherein the substantially straight edge region has a thickness greater than the opposing edge region.

15. The peristaltic pump of claim 1, wherein each finger plate comprises a ceramic material.

16. The peristaltic pump of claim 1, wherein the camshaft comprises a ceramic material.

17. The peristaltic pump of claim 1, further comprising one or more bevel gears coupling the motor to the cam shaft.

18. The peristaltic pump of claim 1, wherein the cam shaft comprises a chamfered portion formed at a radial end of the helical engagement portion.

19. The peristaltic pump of claim 1, wherein the helical engagement portion extends around the cam shaft greater than one revolution of the helical engagement portion.

20. The peristaltic pump of claim 1, further comprising:

a cassette including a cassette housing with a fluid reservoir defined therein, a delivery tube fluidly coupled with the fluid reservoir, the cassette housing having a cassette base region; and

a pump housing having a receiving region to receive the cassette base region, the plurality of finger plates disposed proximate the receiving region.

21. The peristaltic pump of claim 20, wherein each finger plate compresses a portion of the delivery tube in the extended position.

22. The peristaltic pump of claim 21, wherein when the cam shaft rotates out of engagement with the substantially straight edge region of each finger plate, the delivery tube is configured to urge the finger plate away from the extended position.

23. The peristaltic pump of claim 21, wherein the plurality of finger plates are disposed parallel with each other and arranged for sequential movement toward the extended position to sequentially compress the delivery tube to create a vacuum force to draw the beneficial agent from the fluid reservoir.

24. The peristaltic pump of claim 20, further comprising a beneficial agent contained in the fluid reservoir.

25. The peristaltic pump of claim 21, wherein the beneficial agent comprises one or more of levodopa and carbidopa.

26. The peristaltic pump of claim 1, wherein the recessed area is spaced from the substantially straight edge region.

27. The peristaltic pump of claim 26, wherein the recessed area has a contoured edge having a middle and opposing ends, the middle being spaced further from the substantially straight edge region than the opposing ends are from the substantially straight edge region.

28. The peristaltic pump of claim 4, wherein the recessed area is disposed between the aperture of the finger plate and an end surface at an end facing the direction of the transverse movement.

29. The peristaltic pump of claim 27, wherein the contoured edge is configured to strengthen the substantially straight edge region.