Diaphragm pumps and pumping systems
View Patent ↗A process fluid pump can include a pump chamber, an inlet valve, and an outlet valve. Diaphragm regions can define at least a portion of each of the pump chamber, the inlet valve, and the outlet valve. The diaphragm regions can each have an actuation region with a surface that is convexly shaped when the formed actuation region is in a natural unstressed first state, and each formed actuation region can be actuated by a motive fluid to transition to a second state in which the surface is non-convexly shaped.
1. A medical fluid pumping apparatus comprising:
a first rigid plastic member defining first, second, and third cavities, and first, second and third motive fluid passageways in fluid communication with the first, second, and third cavities, respectively, the first, second and third motive fluid passageways extending through the first rigid plastic member to a like surface of the member, and wherein the passageways are configured to mate with respective motive fluid connections on a mating surface of a pump control assembly via the like surface;
a second rigid plastic member defining a first cavity, the second rigid plastic member being permanently fixed to the first rigid plastic member such that the first cavity of the second rigid plastic member is aligned with the first cavity of the first rigid plastic member, and such that the first and second rigid plastic members permanently fixed together are collectively mountable to and removable from the mating surface of the pump control assembly;
a first preshaped diaphragm region disposed between the first and second rigid plastic members, the first preshaped diaphragm region cooperating with the first cavity of the first rigid plastic member to at least partially define a motive fluid portion of a pumping chamber, the first preshaped diaphragm region cooperating with the first cavity of the second rigid plastic member to at least partially define a medical fluid portion of the pumping chamber, the first preshaped diaphragm region separating the motive fluid portion of the pumping chamber from the medical fluid portion of the pumping chamber;
a second preshaped diaphragm region disposed between the first and second rigid plastic members, the second preshaped diaphragm region cooperating with the second cavity of the first rigid plastic member to at least partially define a motive fluid portion of an inlet valve, the second preshaped diaphragm region cooperating with the second rigid plastic member to at least partially define a medical fluid passage of the inlet valve, the second preshaped diaphragm region separating the motive fluid portion of the inlet valve from the medical fluid passage of the inlet valve, the second preshaped diaphragm region being configured to have a convex shape when unstressed and a non-convex shape when pressure is applied to the second preshaped diaphragm region by motive fluid in the motive fluid portion of the inlet valve such that the medical fluid passage of the inlet valve is operated by actuation of the second preshaped diaphragm region using motive fluid in the motive fluid portion of the inlet valve;
a third preshaped diaphragm region disposed between the first and second rigid plastic members, the third preshaped diaphragm region cooperating with the third cavity of the first rigid plastic member to at least partially define a motive fluid portion of an outlet valve, the third preshaped diaphragm region cooperating with the second rigid plastic member to at least partially define a medical fluid passage of the outlet valve, the third preshaped diaphragm region separating the motive fluid portion of the outlet valve from the medical fluid passage of the outlet valve, the third preshaped diaphragm region being configured to have a convex shape when unstressed and a non-convex shape when pressure is applied to the third preshaped diaphragm region by motive fluid in the motive fluid portion of the outlet valve such that the medical fluid passage of the outlet valve is operated by actuation of the third preshaped diaphragm region using motive fluid in the motive fluid portion of the outlet;
wherein the first preshaped diaphragm region is configured to draw medical fluid from a medical fluid source into the medical fluid portion of the pumping chamber and to pump medical fluid out of the medical fluid portion of the pumping chamber when the medical fluid pumping apparatus is connected to the medical fluid source and to one or more motive fluid sources and the first preshaped diaphragm region is actuated by motive fluid, and the second and third preshaped diaphragm regions are configured to respectively control medical fluid flow into and out of the medical fluid portion of the pumping chamber when the medical fluid pumping apparatus is connected to the medical fluid source and to the one or more motive fluid sources and the second and third preshaped diaphragm regions are actuated by motive fluid, and wherein the one or more motive fluid sources includes at least one of a positive pressure motive fluid source dedicated to providing positive pressure to multiple locations of the medical fluid pumping apparatus or a negative pressure motive fluid source dedicated to providing negative pressure to multiple locations of the medical fluid pumping apparatus.
2. The medical fluid pumping apparatus of claim 1 , wherein the medical fluid is blood.
3. The medical fluid pumping apparatus of claim 2 , wherein the medical fluid source is a patient.
4. The medical fluid pumping apparatus of claim 3 , wherein the medical fluid pumping apparatus is configured to draw the blood from the patient into the medical fluid pumping apparatus and to pump the blood from the medical fluid pumping apparatus to the patient.
5. The medical fluid pumping apparatus of claim 1 , wherein the first, second, and third diaphragm regions are separate diaphragms.
6. The medical fluid pumping apparatus of claim 1 , wherein a single diaphragm forms the first, second, and third diaphragm regions.
7. The medical fluid pumping apparatus of claim 1 , wherein the second preshaped diaphragm region is configured to have the non-convex shape when positive pressure is applied to the second preshaped diaphragm region by motive fluid in the motive fluid portion of the inlet valve.
8. The medical fluid pumping apparatus of claim 7 , wherein the third preshaped diaphragm region is configured to have the non-convex shape when positive pressure is applied to the third preshaped diaphragm region by motive fluid in the motive fluid portion of the outlet valve.
9. The medical fluid pumping apparatus of claim 1 , wherein the second and third preshaped diaphragm regions are configured to transition from the convex shape to the non-convex shape without stretching.
10. The medical fluid pumping apparatus of claim 1 , wherein the first preshaped diaphragm region is configured to have a convex shape when unstressed and a non-convex shape when pressure is applied to the first preshaped diaphragm region by motive fluid in the motive fluid portion of the pumping chamber.
11. The medical fluid pumping apparatus of claim 10 , wherein the first preshaped diaphragm region is configured to have the non-convex shape when positive pressure is applied to the first preshaped diaphragm region by motive fluid in the motive fluid portion of the pumping chamber.
12. The medical fluid pumping apparatus of claim 10 , wherein the first preshaped diaphragm region is configured to transition from the convex shape to the non-convex shape without stretching.
13. The medical fluid pumping apparatus of claim 10 , wherein the first preshaped diaphragm region is configured to have a dome shape when unstressed and an oppositely directed dome shape when pressure is applied to the first preshaped diaphragm region by motive fluid in the motive fluid portion of the pumping chamber.
14. The medical fluid pumping apparatus of claim 1 , further comprising a third member adjacent the second member, the first member and the third member being on opposite sides of the second member.
15. The medical fluid pumping apparatus of claim 1 , further comprising an inlet line in fluid communication with the inlet valve to permit medical fluid to flow into the inlet valve, and an outlet line in fluid communication with the outlet valve to receive medical fluid that flows out of the outlet valve.
16. The medical fluid pumping apparatus of claim 1 , wherein the first, second, and third motive fluid passageways are configured to permit motive fluid to pass therethrough to effect movement of the first, second, and third preformed diaphragm regions, respectively.
17. The medical fluid pumping apparatus of claim 16 , wherein the first, second, and third motive fluid passageways are configured to be placed in fluid communication with the one or more motive fluid sources provided by the pump control assembly.
18. A medical fluid pumping apparatus comprising:
a first rigid plastic member defining a pump chamber cavity, an inlet valve seat, and an outlet valve seat;
a first preshaped diaphragm region cooperating with the pump chamber cavity of the first rigid plastic member to at least partially define a medical fluid portion of a pumping chamber, the first preshaped diaphragm separating a motive fluid portion of the pumping chamber from the medical fluid portion of the pumping chamber;
a second preshaped diaphragm region cooperating with the inlet valve seat of the first rigid plastic member to at least partially define a medical fluid passage of an inlet valve, the second preshaped diaphragm region separating a motive fluid portion of the inlet valve from the medical fluid passage of the inlet valve, the second preshaped diaphragm region being configured to have a convex shape when unstressed and a non-convex shape when pressure is applied to the second preshaped diaphragm region by motive fluid in the motive fluid portion of the inlet valve such that the medical fluid passage of the inlet valve is operated by actuation of the second preshaped diaphragm region using motive fluid in the motive fluid portion of the inlet valve;
a third preshaped diaphragm region cooperating with the outlet valve seat of the first rigid plastic member to at least partially define a medical fluid passage of an outlet valve, the third preshaped diaphragm region being configured to have a convex shape when unstressed and a non-convex shape when pressure is applied to the third preshaped diaphragm region by motive fluid in a motive fluid portion of the outlet valve such that the medical fluid passage of the outlet valve is operated by actuation of the third preshaped diaphragm region using motive fluid in the motive fluid portion of the outlet valve;
wherein the first preshaped diaphragm region is configured to draw medical fluid into the medical fluid portion of the pumping chamber via the medical fluid passage of the inlet valve and to pump the medical fluid out of the medical fluid portion of the pumping chamber via the medical fluid passage of the outlet valve when the medical fluid pumping apparatus is connected to a medical fluid source and to one or more motive fluid sources and the first preshaped diaphragm region is actuated by motive fluid, and the second and third preshaped diaphragm regions are configured to respectively control medical fluid flow into and out of the medical fluid portion of the pumping chamber when the medical fluid pumping apparatus is connected to the medical fluid source and to the one or more motive fluid sources and the second and third preshaped diaphragm regions are actuated by motive fluid, and wherein the one or more motive fluid sources includes at least one of a positive pressure motive fluid source dedicated to providing positive pressure to multiple locations of the medical fluid pumping apparatus or a negative pressure motive fluid source dedicated to providing negative pressure to multiple locations of the medical fluid pumping apparatus; and
a second rigid plastic member permanently fixed to the first rigid plastic member, wherein the motive fluid portion of the pumping chamber, the motive fluid portion of the inlet valve and the motive fluid portion of the outlet valve are in fluid communication with a first motive fluid passageway, a second motive fluid passageway, and a third motive fluid passageway, respectively, defined by the second rigid plastic member, wherein the motive fluid passageways extend through the second rigid plastic member to a like surface of the second rigid plastic member, and wherein the motive fluid passageways are configured to mate with respective motive fluid connections on a mating surface of a pump control assembly via the like surface, and wherein the first and second rigid plastic members permanently fixed together are collectively mountable to and removable from the mating surface of the pump control assembly.
19. The medical fluid pumping apparatus of claim 18 , wherein the medical fluid is blood.
20. The medical fluid pumping apparatus of claim 19 , wherein the medical fluid source is a patient.
21. The medical fluid pumping apparatus of claim 20 , wherein the medical fluid pumping apparatus is configured to draw the blood from the patient into the medical fluid pumping apparatus and to pump the blood from the medical fluid pumping apparatus to the patient.
22. The medical fluid pumping apparatus of claim 18 , wherein the first, second, and third diaphragm regions are separate diaphragms.
23. The medical fluid pumping apparatus of claim 18 , wherein a single diaphragm forms the first, second, and third diaphragm regions.
24. The medical fluid pumping apparatus of claim 18 , wherein the second preshaped diaphragm region is configured to have the non-convex shape when positive pressure is applied to the second preshaped diaphragm region by motive fluid in the motive fluid portion of the inlet valve.
25. The medical fluid pumping apparatus of claim 24 , wherein the third preshaped diaphragm region is configured to have the non-convex shape when positive pressure is applied to the third preshaped diaphragm region by motive fluid in the motive fluid portion of the outlet valve.
26. The medical fluid pumping apparatus of claim 18 , wherein the second and third preshaped diaphragm regions each have a cord length of less than three percent and are configured to transition from the convex shape to the non-convex shape without stretching.
27. The medical fluid pumping apparatus of claim 18 , wherein the first preshaped diaphragm region is configured to have a convex shape when unstressed and a non-convex shape when pressure is applied to the first preshaped diaphragm region by motive fluid in the motive fluid portion of the pumping chamber.
28. The medical fluid pumping apparatus of claim 27 , wherein the first preshaped diaphragm region is configured to have the non-convex shape when positive pressure is applied to the first preshaped diaphragm region by motive fluid in the motive fluid portion of the pumping chamber.
29. The medical fluid pumping apparatus of claim 27 , wherein the first preshaped diaphragm region is configured to transition from the convex shape to the non-convex shape without stretching.
30. The medical fluid pumping apparatus of claim 27 , wherein the first preshaped diaphragm region is configured to have a dome shape when unstressed and an oppositely directed dome shape when pressure is applied to the first preshaped diaphragm region by motive fluid in the motive fluid portion of the pumping chamber.
31. The medical fluid pumping apparatus of claim 18 , wherein the first preshaped diaphragm region is disposed between the first and second members.
32. The medical fluid pumping apparatus of claim 31 , wherein the second member defines a cavity aligned with a domed pump chamber cavity of the first member, the cavity of the second member forming the motive fluid portion of the pumping chamber.
33. The medical fluid pumping apparatus of claim 18 , wherein the second and third preshaped diaphragm regions are disposed between the first and second members.
34. The medical fluid pumping apparatus of claim 33 , wherein the second member defines cavities aligned with the inlet and outlet valve seats of the first member, the cavities of the second member forming the motive fluid portions of the inlet and outlet valves.
35. The medical fluid pumping apparatus of claim 18 , further comprising a third member adjacent the first member, the second member and the third member being on opposite sides of the first member.
36. The medical fluid pumping apparatus of claim 18 , further comprising an inlet line in fluid communication with the inlet valve to permit medical fluid to flow into the inlet valve, and an outlet line in fluid communication with the outlet valve to receive medical fluid that flows out of the outlet valve.
37. The medical fluid pumping apparatus of claim 18 , wherein the first, second, and third motive fluid passageways are configured to permit motive fluid to pass therethrough to effect movement of the first, second, and third preformed diaphragm regions, respectively.
38. The medical fluid pumping apparatus of claim 37 , wherein the first, second, and third motive fluid passageways are configured to be placed in fluid communication with the one or more motive fluid sources provided by the pump control assembly.