Fail safe system for operating medical fluid valves

• US 20040010223A1
• Filed: 05/24/2002
• Published: 01/15/2004
• Est. Priority Date: 05/24/2002
• Status: Active Grant

• Current Assignee: Baxter Healthcare SA (Baxter International Inc.), Baxter International Inc.
• Original Assignee: Baxter International Inc.
• Inventors: Busby, Don, Hopping, Peter
• Granted Patent: US 7,087,036 B2
• Time in Patent Office: Days
• US Class Current: 604/30
• CPC Class Codes: A61M 1/153 the cassette being adapted for heating or cooling the treating fluid, e.g. the dialysate or the treating gas
• CPC Class Codes: A61M 1/155 with treatment-fluid pumping means or components thereof
• CPC Class Codes: A61M 1/1561 at least one cassette surface or portion thereof being flexible, e.g. the cassette having a rigid base portion with preformed channels and being covered with a foil
• CPC Class Codes: A61M 1/1565 Details of valves
• CPC Class Codes: A61M 1/159 specially adapted for peritoneal dialysis
• CPC Class Codes: A61M 1/166 Heating for sterilisation A61M1/1686
• CPC Class Codes: A61M 1/28 Peritoneal dialysis ; Other peritoneal treatment, e.g. oxygenation
• CPC Class Codes: A61M 1/288 Priming priming in extracorporeal blood circuits A61M1/3643
• CPC Class Codes: A61M 2205/12 with interchangeable cassettes forming partially or totally the fluid circuit
• CPC Class Codes: A61M 2205/122 using evacuated interfaces to enhance contact
• CPC Class Codes: A61M 2205/127 with provisions for heating or cooling
• CPC Class Codes: A61M 2205/33 Controlling, regulating or measuring
• CPC Class Codes: A61M 2205/3337 Controlling, regulating pressure or flow by means of a valve by-passing a pump
• CPC Class Codes: A61M 2205/3344 Measuring or controlling pressure at the body treatment site
• CPC Class Codes: A61M 2205/35 Communication
• CPC Class Codes: A61M 2205/3653 by Joule effect, i.e. electric resistance
• CPC Class Codes: A61M 2205/502 User interfaces, e.g. screens or keyboards
• CPC Class Codes: A61M 2205/581 by audible feedback
• CPC Class Codes: A61M 2205/583 by visual feedback
• CPC Class Codes: A61M 5/445 the media being heated in the reservoir, e.g. warming bloodbags
• CPC Class Codes: F04B 43/02 : having plate-like flexible members, e.g. diaphragms F04B43/14 takes precedence
• CPC Class Codes: F04B 45/04 : having plate-like flexible members, e.g. diaphragms F04B45/10 takes precedence
• CPC Class Codes: H05B 1/025 : For medical applications
• CPC Class Codes: Y10S 706/90 : Fuzzy logic
• CPC Class Codes: Y10T 137/87161 : With common valve operator

Abstract

A method, system and apparatus for performing peritoneal dialysis are provided. To this end, in part, a cam arrangement for operating a series of valves in cooperation with a pump that pumps fluid to and from a patient, the valves including a supply valve, a drain valve, a from patient valve and a to-patient valve is provided. The cam arrangement includes a camshaft and a series of cams connected to the camshaft. The cams are positioned and arranged to toggle back and forth between a first open position for the supply valve and a second open position for the drain valve, a third open position for the from-patient valve and the second open position, and the first open position and a fourth open position for the to-patient valve.

Claims

1. A cam arrangement for operating a series of valves in cooperation with a pump that pumps fluid to and from a patient, the valves including a supply valve, a drain valve, a from patient valve and a to patient valve, the cam arrangement comprising:

a camshaft; and

a series of cams connected to the camshaft, the cams positioned and arranged to toggle back and forth between;

a first open position for the supply valve and a second open position for the drain valve,

a third open position for the from-patient valve and the second open position, and

the first open position and a fourth open position for the to-patient valve.

2. The cam arrangement of claim 1, wherein the first open position is located between the second open position and the fourth open position.

3. The cam arrangement of claim 1, wherein the cams further define a plurality of positions wherein all the valves are closed between each of:

(i) the third open position and the second open position, (ii) the first open position and the second open position, and (iii) the first open position and the fourth open position.

4. The cam arrangement of claim 1, wherein the cams further define a fifth open position wherein all the supply valve, drain valve, from-patient valve, and to-patient valve are open.

5. The cam arrangement of claim 4, wherein the fifth open position is located between the third open position and the fourth open position.

6. The cam arrangement of claim 1, wherein the cams further define a sixth open position for a last-bag valve.

7. The cam arrangement of claim 6, wherein the fourth open position is located between the first open position and the sixth open position.

8. The cam arrangement of claim 6, wherein the cams are further positioned and arranged to toggle back and forth between the sixth open position and the fourth open position.

9. The cam arrangement of claim 1, wherein the fourth open position is arranged via a plurality of the cams that collectively open a flow path that cooperates with a fluid heater.

10. A method of operating a series of valves to pump fluid to and from a patient comprising the steps of:

(a) sequentially toggling a camshaft between a first open position for a from-patient valve and a second open position for a drain valve to drain fluid from a patient; and

(b) sequentially toggling the camshaft between a third open position for a supply valve and a fourth open position for a to-patient valve to fill the patient with fluid.

11. The method of claim 10, wherein at least one of the steps (a) and (b) further includes intermittently moving to a position wherein all of the valves are closed.

12. The method of claim 10, which includes the step of sequentially toggling the camshaft between the third open position and the second open position to perform a system prime.

13. The method of claim 10, which includes the step of sequentially toggling the camshaft between the third open position and the fourth open position to perform a patient line prime.

14. The method of claim 10, which includes the step of toggling the camshaft between a firth open position for a last-bag valve and the fourth open position to deliver a final fluid fill to the patient.

15. The method of claim 10, which includes the step of repeating steps (a) and (b) at least one time.

16. The method of claim 10, which includes the step of rotating the camshaft to a position where all the valves are open prior to a mechanical connection between a valve manifold and the camshaft.

17. A method of operating a series of valves to pump fluid through a line to and from a patient comprising the steps of:

allowing a hardware unit to be opened and a valve manifold to be placed therein;

preventing the opening of the hardware unit once fluid flow through the begins; and

sensing when a patient is isolated from the valve manifold and preventing fluid flow through the line.

18. The method of claim 17, wherein preventing the opening of the hardware unit includes moving a mechanical interlock.

19. The method of claim 17, which includes providing a camshaft that operates with the valve manifold and the step of restricting movement of the camshaft once fluid flow begins.

20. The method of claim 17, which includes the step of closing each of the valves after placing the manifold in the hardware unit and before fluid flow begins.

21. An automated medical fluid system comprising:

a series of valves;

a camshaft that operates the valves;

a motor that drives the camshaft; and

a controller that operates with the motor to;

sequentially toggle the camshaft between a first open position for a from-patient valve and a second open position for a drain valve to drain fluid from a patient; and

sequentially toggle the camshaft between a third open position for a supply valve and a fourth open position for a to-patient valve to fill the patient with fluid.