Diaphragm pump and related methods

• US 8,197,231 B2
• Filed: 11/26/2007
• Issued: 06/12/2012
• Est. Priority Date: 07/13/2005
• Status: Active Grant

• Current Assignee: Baxter Healthcare SA (Baxter International Inc.), Baxter International Inc., Purity Solutions ,LLC
• Original Assignee: Purity Solutions ,LLC
• Inventors: Orr, Troy J.
• Primary Examiner(s): Kramer, Devon C
• Assistant Examiner(s): LETTMAN, BRYAN MATTHEW
• Application Number:
  US11/945,177
• Publication Number:
  US 20080077068A1
• Time in Patent Office: 1,660 Days
• Field of Search: 417/322, 417/394, 417/395, 417/507, 417/521, 417/533, 417/413.1, 92/48, 92/49, 92/96, 92/98.R, 137/512.15, 137/512.4, 137/859, 604/6.11
• US Class Current: 417/395
• CPC Class Codes: A61M 1/14 Dialysis systems; Artificial kidneys; Blood oxygenators semi-permeable membranes characterised by the material, manufacturing processes therefor B01D71/00; Reciprocating systems for treatment of body fluids, e.g. single needle systems for hemofiltration or pheresis
• CPC Class Codes: A61M 1/3666 Cardiac or cardiopulmonary bypass, e.g. heart-lung machines
• CPC Class Codes: A61M 1/3667 with assisted venous return
• CPC Class Codes: A61M 2202/0413 Blood
• CPC Class Codes: A61M 5/14224 Diaphragm type
• CPC Class Codes: A61M 60/109 incorporated within extracorporeal blood circuits or systems
• CPC Class Codes: A61M 60/113 in other functional devices, e.g. dialysers or heart-lung machines
• CPC Class Codes: A61M 60/38 Blood oxygenation
• CPC Class Codes: A61M 60/43 using vacuum at the blood pump, e.g. to accelerate filling
• CPC Class Codes: A61M 60/847 arranged in a cassette
• CPC Class Codes: A61M 60/851 Valves
• CPC Class Codes: A61N 2005/1021 Radioactive fluid
• CPC Class Codes: F04B 2201/0601 Opening times
• CPC Class Codes: F04B 2201/0605 Leakage over a valve
• CPC Class Codes: F04B 23/04 Combinations of two or more pumps
• CPC Class Codes: F04B 43/06 Pumps having fluid drive
• CPC Class Codes: F04B 43/0736 with two or more pumping chambers in parallel
• CPC Class Codes: F04B 45/043 two or more plate-like pumping flexible members in parallel
• CPC Class Codes: F04B 45/0536 the actuating fluid being controlled by one or more valves
• CPC Class Codes: F04B 53/109 inlet and outlet valve forming one unit
• CPC Class Codes: F04B 7/02 : the valving being fluid-actuated
• CPC Class Codes: F04B 7/0275 : and being deformable, e.g. membranes
• CPC Class Codes: Y10T 137/7843 : Integral resilient member forms plural valves

Abstract

In some arrangements, a pump for moving a fluid has one or more pump chambers and one or more flow control valves with diaphragm actuation regions. Motive fluid can activate the diaphragm actuation regions, and a pattern of fluid flow can be controlled by varying the pressure levels of the motive fluid.

Claims

1. A process fluid pump comprising:

a first pump chamber configured to be actuated by a fluid pressure;

a first inlet valve configured to actively control the ingress of process fluid to the first pump chamber and a first outlet valve configured to actively control the egress of process fluid from the first pump chamber;

a substantially rigid first housing portion;

a substantially rigid second housing portion;

a substantially rigid third housing portion;

a first diaphragm portion disposed between the first and second housing portions and cooperating therewith to at least partially define the first pump chamber; and

a second diaphragm portion disposed between the first and third housing portions, the second diaphragm portion comprising a first and a second preformed actuation region, the first preformed actuation region cooperating with the first and third housing portions to at least partially define the first inlet valve, the second preformed actuation region cooperating with the first and third housing portions to at least partially define the first outlet valve,

wherein the first preformed actuation region defines a convex shape when in a natural unstressed state, and wherein the first preformed actuation region is configured to transition from the convex shape to an oppositely directed concave shape while positioned between the first and third housing portions, and

wherein the second preformed actuation region defines a convex shape when in a natural unstressed state, and wherein the second preformed actuation region is configured to transition from the convex shape to an oppositely directed concave shape while positioned between the first and third housing portions.

2. The process fluid pump of claim 1, wherein the first housing portion defines a first inlet valve seat and a first outlet valve seat, wherein the first preformed actuation region of the second diaphragm portion is configured to move between the first inlet valve seat and the third housing portion, and wherein the second preformed actuation region of the second diaphragm portion is configured to move between the first outlet valve seat and the third housing portion.

3. The process fluid pump of claim 2, wherein the first housing portion defines a first chamber channel in fluid communication with the first pump chamber and a second chamber channel in fluid communication with the first pump chamber, wherein the first preformed actuation region of the second diaphragm portion is configured to selectively substantially prevent fluid communication between the first chamber channel and the first inlet valve to prevent process fluid from entering the first pump chamber via the first chamber channel and the second preformed actuation region of the second diaphragm portion is configured to selectively substantially prevent fluid communication between the second chamber channel and the first outlet valve to prevent process fluid from exiting the first pump chamber via the second chamber channel.

4. The process fluid pump of claim 3, wherein the first housing portion defines a process fluid inlet channel and a process fluid outlet channel, wherein the first inlet valve is in fluid communication with the process fluid inlet channel and is configured to selectively permit process fluid to flow from the process fluid inlet channel to the first pump chamber via the first chamber channel, and wherein the first outlet valve is in fluid communication with the process fluid outlet channel and is configured to permit process fluid to flow from the first pump chamber to the process fluid outlet channel via the second chamber channel.

5. The process fluid pump of claim 1, wherein the third housing portion comprises a first motive fluid passageway in fluid communication with the first inlet valve and a second motive fluid passageway in fluid communication with the first outlet valve, wherein the first and second motive fluid passageways are configured to receive motive fluid to actuate the first inlet valve and the first outlet valve, respectively.

6. The process fluid pump of claim 1, further comprising a second pump chamber configured to be actuated by a fluid pressure, the first and second housing portions cooperating to at least partially define the second pump chamber.

7. The process fluid pump of claim 6, further comprising a second inlet valve configured to selectively permit process fluid to enter the second pump chamber and a second outlet valve configured to selectively permit process fluid to exit the second pump chamber.

8. The process fluid pump of claim 7, wherein the first and third housing portions at least partially define the second inlet valve and the second outlet valve.

9. The process fluid pump of claim 7, wherein the second inlet valve comprises a preformed actuation region of the second diaphragm portion and the second outlet valve comprises a preformed actuation region of the second diaphragm portion.

10. The process fluid pump of claim 9, wherein the first and second inlet valves and the first and second outlet valves comprise an integrated diaphragm media.

11. The process fluid pump of claim 1, wherein the first pump chamber comprises a preformed actuation region of the first diaphragm portion.

12. The process fluid pump of claim 11, further comprising a motive fluid passageway configured to deliver motive fluid to the first pump chamber, the motive fluid passageway extending through the first housing member.

13. The process fluid pump of claim 9, wherein a single plate comprises the second and third housing portions.

14. The process fluid pump of claim 9, wherein a first plate comprises the first housing portion, a second plate comprises the second housing portion, and a third plate comprises the third housing portion.

15. The process fluid pump of claim 9, wherein a single diaphragm media comprises the first and second diaphragm portions.