Pump Module For Use In A Medical Fluid Dispensing System

• US 20080287872A1
• Filed: 05/16/2007
• Published: 11/20/2008
• Est. Priority Date: 05/16/2007
• Status: Active Grant

• Current Assignee: Smiths Medical ASD, Inc. (Smiths Group International Holdings Ltd.)
• Original Assignee: Smiths Medical ASD, Inc. (Smiths Group International Holdings Ltd.)
• Inventors: Patzer, Charles R.
• Granted Patent: US 7,951,112 B2
• Time in Patent Office: Days
• US Class Current: 604/131
• CPC Class Codes: A61M 2205/12 with interchangeable cassettes forming partially or totally the fluid circuit
• CPC Class Codes: A61M 2205/128 with incorporated valves
• CPC Class Codes: A61M 2206/22 eliminating pulsatile flows, e.g. by the provision of a dampening chamber
• CPC Class Codes: A61M 5/1413 Modular systems comprising interconnecting elements
• CPC Class Codes: A61M 5/1422 with double acting or multiple pistons
• CPC Class Codes: A61M 5/385 using hydrophobic filters

Abstract

A pump module is provided for use in a medical fluid dispensing system that includes a pump body made of a non-compliant material and first and second pump chambers formed in the body. Each of the chambers has a first, open end and an opposite, closed end. The pump module further includes first and second pistons in the first and second pump chambers, respectively. At least one fluid inlet and a fluid outlet are selectively in fluid communication with the first and second pump chambers. Each of the pistons extends through the open end of a respective one of the pump chambers, with each of the pistons being operably translatable within the pump chamber toward and away from the closed end of the chamber. The pistons are translatable independently of one another.

Claims

1. A pump module for use in a medical fluid dispensing system comprising:

a pump body made of a non-compliant material;

first and second pump chambers formed in said body, each of said chambers having a first, open end and an opposite, closed end;

first and second pistons in said first and second pump chambers, respectively;

at least one fluid inlet selectively in fluid communication with said first and second pump chambers;

a fluid outlet selectively in fluid communication with said first and second pump chambers;

wherein

each of said pistons extends through said open end of a respective one of said pump chambers, each of said pistons being operably translatable within said respective one of said pump chambers toward and away from said closed end of said respective one of said pump chambers, said pistons being translatable independently of one another.

2. A pump module as recited in claim 1, wherein:

said first piston is translatable and rotatable within said first pump chamber and said second piston is translatable and rotatable within said second pump chamber.

3. A pump module as recited in claim 2, wherein:

said at least one fluid inlet comprises a single fluid inlet;

said first piston is rotatable to a first angular orientation wherein said single fluid inlet is in fluid communication with said first pump chamber and is rotatable to a second angular orientation wherein said fluid outlet is in fluid communication with said first pump chamber;

said second piston is rotatable to a first angular orientation wherein said single fluid inlet is in fluid communication with said second pump chamber and is rotatable to a second angular orientation wherein said fluid outlet is in fluid communication with said second pump chamber.

4. A pump module as recited in claim 2, wherein:

said at least one fluid inlet comprises first and second fluid inlets, each being selectively in fluid communication with said first and second pump chambers.

5. A pump module as recited in claim 2, wherein:

each of said pistons comprises a longitudinally extending channel formed therein and in fluid communication with a corresponding one of said pump chambers, each of said channels being selectively in fluid communication with said at least one fluid inlet and said fluid outlet.

6. A pump module as recited in claim 1, wherein:

said first and second pistons are disposed in opposing relationship with one another.

7. A pump module as recited in claim 6, wherein:

said body comprises a transverse wall separating said first and second pump chambers.

8. A pump module as recited in claim 1, wherein:

said pump body is made of a plastic material.

9. A pump module as recited in claim 1, further comprising:

a pair of porous air filters, each comprising a hydrophobic material and each being in fluid communication with one of said pump chambers, wherein each of said filters is operably effective for allowing any air entrained within a fluid being pumped out of a corresponding one of said pump chambers to pass through said filter and discharge from said pump module.

10. A pump module as recited in claim 1, wherein:

said at least one fluid inlet comprises first and second fluid inlets;

said pump module further comprises first and second inlet manifolds and an outlet manifold;

said first and second inlet manifolds define said first and second fluid inlets, respectively, and said outlet manifold defines said fluid outlet.

11. A pump module as recited in claim 1, wherein:

said at least one fluid inlet comprises a single fluid inlet;

said pump module further comprises an inlet manifold and an outlet manifold;

said inlet manifold defines said single fluid inlet and said outlet manifold defines said fluid outlet.

12. A pump module as recited in claim 1, wherein:

said pistons are disposed in a side-by-side relationship with one another.

13. A pump module as recited in claim 12, wherein:

said pump body comprises a pair of laterally spaced cylinders formed therein, each of said cylinders defining one of said pump chambers.

14. A pump module as recited in claim 1, further comprising:

an inlet manifold and an outlet manifold; and

an inlet valve and an outlet valve;

wherein

said at least one fluid inlet comprises a single fluid inlet, said inlet manifold defining said fluid inlet, said outlet manifold defining said fluid outlet;

said inlet valve comprises a stem extending into said inlet manifold downstream of said single fluid inlet and upstream of said pump chambers;

said outlet valve comprises a stem extending into said outlet manifold downstream of said pump chambers and upstream of said fluid outlet.

15. A pump module as recited in claim 1, further comprising:

an inlet valve and an outlet valve, each comprising a rotatable valve;

wherein

said at least one fluid inlet comprises a single fluid inlet;

said inlet valve is rotatable to a first angular orientation wherein said first pump chamber is in fluid communication with said single fluid inlet and is rotatable to a second orientation wherein said second pump chamber is in fluid communication with said single fluid inlet;

said outlet valve is rotatable to a first angular orientation wherein said first pump chamber is in fluid communication with said fluid outlet and is rotatable to a second angular orientation wherein said second pump chamber is in fluid communication with said fluid outlet.

16. A pump module as recited in claim 1, further comprising:

a manifold, said manifold defining said at least one fluid inlet and said fluid outlet.

17. A pump module as recited in claim 16, further comprising:

an inlet valve having a stem, said stem extending into said manifold downstream of said at least one fluid inlet and upstream of said pump chambers;

an outlet valve having a stem, said stem extending into said manifold downstream of said pump chambers and upstream of said fluid outlet.

18. A pump module as recited in claim 17, wherein:

said inlet and outlet valves are rotatable valves;

said at least one fluid inlet comprises a single fluid inlet;

said inlet valve is rotatable to a first angular orientation wherein said single fluid inlet is in fluid communication with said first pump chamber and is rotatable to a second angular orientation wherein said single fluid inlet is in fluid communication with said second pump chamber; and

said outlet valve is rotatable to a first angular orientation wherein said fluid outlet is in fluid communication with said first pump chamber and is rotatable to a second angular orientation wherein said fluid outlet is in fluid communication with said second pump chamber.

19. A pump comprising:

a pump body made of a non-compliant material;

first and second pump chambers formed in said body, each of said chambers having a first, open end and an opposite, closed end;

first and second pistons in said first and second pump chambers, respectively;

a fluid inlet selectively in fluid communication with said first and second pump chambers;

a fluid outlet selectively in fluid communication with said first and second pump chambers;

first and second linear actuators coupled to said first and second pistons, respectively;

wherein

each of said pistons extends through said open end of a respective one of said pump chambers;

said first linear actuator is operable for translating said first piston within said first pump chamber toward and away from said closed end of said first pump chamber;

said second linear actuator is operable for translating said second piston within said second pump chamber toward and away from said closed end of said second pump chamber; and

said first and second linear actuators are operable independently of one another wherein said first and second pistons are translatable independently of one another.

20. A pump as recited in claim 19, further comprising:

first and second rotational actuators.

21. A pump as recited in claim 20, wherein:

said first piston is mechanically coupled to said first rotational actuator, wherein said first piston is translatable and rotatable within said first pump chamber;

said second piston is mechanically coupled to said second rotational actuator, wherein said second piston is translatable and rotatable within said second pump chamber.

22. A pump as recited in claim 20, wherein:

said first rotational actuator is mechanically coupled to said first piston and is operable for rotating said first position to a first angular orientation wherein said first pump chamber is in fluid communication with said fluid inlet and is operable for rotating said first piston to a second angular orientation wherein said first pump chamber is in fluid communication with said fluid outlet;

said second rotational actuator is mechanically coupled to said second piston, wherein said second rotational actuator is operable for rotating said second piston to a first angular orientation wherein said second pump chamber is in fluid communication with said fluid inlet and is operable for rotating said second piston to a second angular orientation wherein said second pump chamber is in fluid communication with said fluid outlet.

23. A pump as recited in claim 20, further comprising:

an inlet valve and an outlet valve;

wherein

said first rotational actuator is mechanically coupled to said inlet valve and is operable for rotating said inlet valve to a first angular orientation wherein said fluid inlet is in fluid communication with said first pump chamber and is operable for rotating said inlet valve to a second angular orientation wherein said fluid inlet is in fluid communication with said second pump chamber;

said second rotational actuator is mechanically coupled to said outlet valve, wherein said second rotational actuator is operable for rotating said outlet valve to a first angular orientation wherein said fluid outlet is in fluid communication with said first pump chamber, and is operable for rotating said outlet valve to a second angular orientation wherein said fluid outlet is in fluid communication with said second pump chamber.

24. A system for dispensing medical fluids intravenously to a patient comprising:

a pump; and

a programmable controller;

wherein said pump comprises;

a pump body made of a non-compliant material;

first and second pump chambers formed in said body, each of said chambers having a first, open end and an opposite, closed end;

first and second pistons in said first and second pump chambers, respectively;

a fluid inlet selectively in fluid communication with said first and second pump chambers;

a fluid outlet selectively in fluid communication with said first and second pump chambers;

first and second linear actuators coupled to said first and second pistons, respectively; and

wherein

each of said pistons extends through said open end of a respective one of said pump chambers;

said first linear actuator is operable for translating said first piston within said first pump chamber toward and away from said closed end of said first pump chamber;

said second linear actuator is operable for translating said second piston within said second pump chamber toward and away from said closed end of said second pump chamber; and

said first and second linear actuators are controlled independently of one another by said programmable controller such that said first and second pistons are translatable independently of one another.

25. A system as recited in claim 24, further comprising:

a first rotational actuator mechanically coupled to said first piston;

a second rotational actuator mechanically coupled to said second piston;

wherein

said first and second rotational actuators are controlled independently of one another by said controller.

26. A system as recited in claim 24, further comprising:

inlet and outlet valves;

a first rotational actuator mechanically coupled to said inlet valve; and

a second rotational actuator mechanically coupled to said outlet valve;

wherein

said first and second rotational actuators are controlled independently of one another by said controller.

27. A method for pumping fluid in a medical fluid dispensing system comprising the steps of:

providing a pump module having a pump body made of a non-compliant material, the pump body having first and second pump chambers formed therein, each having a first, open end and an opposite, closed end, with the pump module further comprising a fluid inlet selectively in fluid communication with the first and second pump chambers and a fluid outlet selectively in fluid communication with the first and second pump chambers, the pump module further comprising first and second pistons in the first and second pump chambers, respectively;

providing first and second linear actuators, the first linear actuator being mechanically coupled to the first piston, the second linear actuator being mechanically coupled to the second piston;

translating the first and second pistons with the corresponding linear actuator within the respective one of the pump chambers toward and away from the closed end of the respective one of the pump chambers;

operating the linear actuators independently of one another.

28. A method as recited in claim 27, wherein the pump further includes a first rotational actuator mechanically coupled to the first piston and a second rotational actuator mechanically coupled to the second piston, said method further comprising:

rotating one of the pistons with the corresponding rotational actuator to a first angular orientation wherein the fluid inlet is in fluid communication with the corresponding pump chamber;

retracting the one of the pistons within the corresponding pump chamber to at least partially fill the corresponding pump chamber with medical fluid;

subsequently rotating the one of the pistons to a second angular orientation wherein the fluid outlet is in fluid communication with the corresponding one of the pump chambers and extending the one of the pistons within the corresponding pump chamber to pump the medical fluid out of the corresponding pump chamber and through the fluid outlet.

29. A method as recited in claim 27, wherein the pump further includes an inlet valve, a first rotational actuator mechanically coupled to the inlet valve, an outlet valve and a second rotational actuator mechanically coupled to the outlet valve, said method further comprising:

rotating the inlet valve with the first rotational actuator to a first angular orientation wherein the fluid inlet is in fluid communication with one of the pump chambers;

retracting the corresponding piston within the one of the pump chambers to at least partially fill the one of the pump chambers with medical fluid;

rotating the inlet valve with the first rotational actuator to a second angular orientation wherein the fluid inlet is fluidicly uncoupled with the one of the pump chambers;

subsequently rotating the outlet valve with the second rotational actuator to an angular orientation wherein the fluid outlet is in fluid communication with the one of the pump chambers and extending the corresponding piston within the one of the pump chambers to pump the medical fluid out of the one of the pump chambers and through the fluid outlet.