System and method for high pressure delivery of gas-supersaturated fluids

• US 6,782,924 B2
• Filed: 06/14/2001
• Issued: 08/31/2004
• Est. Priority Date: 08/15/1997
• Status: Expired due to Fees

• Current Assignee: TherOx Incorporated (Asahi Kasei Corporation)
• Original Assignee: TherOx Incorporated (Asahi Kasei Corporation)
• Inventors: Gessert, James M., Daoud, Adib G.
• Primary Examiner(s): MAUST, TIMOTHY LEWIS
• Application Number:
  US09/882,798
• Publication Number:
  US 20020032402A1
• Time in Patent Office: 1,174 Days
• Field of Search: 141/2, 141/18, 141/21, 141/25, 141/27, 141/98, 141/285, 141/301, 604/23, 604/26, 604/154, 222/309, 222/340
• US Class Current: 141/2
• CPC Class Codes: A61M 1/32 Oxygenators without membranes
• CPC Class Codes: A61M 2202/0476 Oxygenated solutions

Abstract

A system and method for generating a gas-supersaturated fluid and delivering the fluid at high delivery pressures to thereby prevent bubble nucleation is disclosed. The system comprises a housing for containing a removable fluid assembly for housing a fluid to be gas-supersaturated and a drive assembly for delivering the fluid to a delivery site. The housing assembly comprises a cylinder and a piston which may be advanced along the inner surface of the cylinder to pressurize and to deliver the fluid. To generate a gas-supersaturated fluid, the housing assembly is removed from the system housing, filled with a fluid, and gas is introduced at or slightly above the desired gas partial pressure into the cylinder. To deliver the gas-supersaturated fluid, the fluid assembly is returned to the system housing and the drive assembly advances the piston to increase the hydrostatic pressure to the desired delivery pressure and, after opening a valve, to deliver the gas-supersaturated fluid at the desired high delivery pressure to a delivery site.

Claims

1. A system for pressurizing a gas-enriched fluid comprising:

a fluid assembly having a receptacle for holding the gas-enriched fluid, and having a piston adapted to travel within the receptacle to contain the gas-enriched fluid within the receptacle, the piston comprising;

a seal adapted to seal the piston within the receptacle;

a port extending through the piston;

a valve operatively arranged relative to the port to permit introduction of the gas-enriched fluid into the receptacle; and

a drive assembly adapted to advance the piston within the receptacle to pressurize gas-supersaturated fluid within the receptacle.

3. The system, as set forth in claim 1, wherein the valve comprises a check valve, the check valve having a valve seat, a ball, and a spring, the spring biasing the ball toward the valve seat.

4. The system, as set forth in claim 3, wherein the piston comprises an actuator being moveable in a first direction to move the ball away from the valve seat and being moveable in a second direction to move the ball into contact with the valve seat.

5. The system, as set forth in claim 4, wherein the gas-enriched fluid may be introduced into the receptacle through the piston when the actuator moves the ball in the first direction.

6. The system, as set forth in claim 3, wherein the gas-enriched fluid may the gas-enriched fluid may be introduced into the receptacle through the piston when the gas-enriched fluid overcomes the force of the spring to move the ball away from the valve seat.

7. The system, as set forth in claim 1, wherein the port is adapted to accept a cannula for the introduction of the gas-enriched fluid into the receptacle.

8. The system, as set forth in claim 1, wherein the receptacle comprises a piston cap which retains the piston within the receptacle.

9. The system, as set forth in claim 3, wherein the check valve prevents the gas-enriched fluid from escaping from the receptacle.

10. The system, as set forth in claim 1, wherein the seal comprises a high pressure seal disposed about a peripheral portion of the piston.

11. The system, as set forth in claim 1, wherein drive assembly comprises a drive screw and a piston pusher, the piston pusher being disposed on the drive screw and being moveable along the drive screw and into contact with the piston in response to rotation of the drive screw.

12. The system, as set forth in claim 11, wherein the drive assembly comprises a motor being drivingly coupled to a gear box, the gear box being operably coupled to the drive screw to cause rotation of the drive screw.

13. The system, as set forth in claim 1, comprising a housing, the fluid assembly and the drive assembly being disposed in the housing.

14. The system, as set forth in claim 1, comprising a display coupled to the system to indicate given operating parameters to a user.

15. The system, as set forth in claim 1, comprising a control panel coupled to the system to input given operating parameters into the system.

2. The system, as set forth in clam 1, wherein the receptacle is cylindrical.

16. A system for pressurizing fluid comprising:

a rotatable power screw having a first end and a second end;

a piston pusher traveling on the power screw in response to rotation thereof, the piston pusher having a collar portion engaging the power screw and a depending portion extending from the collar portion along the power screw;

a support plate located adjacent the first end of the power screw, the support plate having an aperture configured to pass the depending portion of the piston pusher therethrough;

a fluid receptacle disposed on an opposite side of the support plate from the power screw; and

a piston disposed in the fluid receptacle, the piston being slidable within the fluid receptacle in response to a force exerted on the piston by the depending portion of the piston pusher, the piston comprising;

a seal adapted to seal the piston within the receptacle;

a port extending through the piston; and

a valve operatively arranged relative to the port to permit introduction of the fluid into the receptacle.

17. The system, as set forth in claim 16, wherein the valve comprises a check valve, the check valve having a valve seat, a ball, and a spring, the spring biasing the ball toward the valve seat.

18. The system, as set forth in claim 17, wherein the piston comprises an actuator being moveable in a first direction to move the ball away from the valve seat and being moveable in a second direction to move the ball into contact with the valve seat.

19. The system, as set forth in claim 18, wherein the fluid may be introduced into the receptacle through the piston when the actuator moves the ball in the first direction.

20. The system, as set forth in claim 17, wherein the fluid may be introduced into the receptacle through the piston when the fluid overcomes the force of the spring to move the ball away from the valve seat.

21. The system, as set forth in claim 16, wherein the port is adapted to accept a cannula for the introduction of the fluid into the receptacle.

22. The system, as set forth in claim 16, wherein the receptacle comprises a retainer which retains the piston within the receptacle.

23. The system, as set forth in claim 17, wherein the check valve prevents the fluid from escaping from the receptacle.

24. The system, as set forth in claim 16, wherein the seal comprises a high pressure seal disposed about a peripheral portion of the piston.

25. The system, as set forth in claim 22, wherein the retainer comprises a piston cap.

26. The system, as set forth in claim 16, comprising a motor being drivingly coupled to a gear box, the gear box being operably coupled to the power screw to cause rotation of the power screw.

27. The system, as set forth in claim 16, comprising a display coupled to the system to indicate given operating parameters to a user.

28. The system, as set forth in claim 16, comprising a control panel coupled to the system to input given operating parameters into the system.

29. A method for introducing gas-enriched fluid into a high pressure vessel comprising the acts of:

(a) providing a receptacle having a piston therein, the piston comprising a seal adapted to seal the piston within the receptacle, a port extending through the piston, and a valve operatively arranged relative to the port to permit introduction of the fluid into the receptacle; and

(b) delivering gas-enriched fluid into the receptacle through the valve and the port in the piston.

30. The method, as set forth in claim 29, comprising the act of:

advancing a piston to pressurize the gas-enriched fluid within the receptacle.

31. The method, as set forth in claim 30, further comprising a method of delivering the gas-enriched fluid comprising the acts of:

delivering the pressurized gas-enriched fluid to a delivery site; and

advancing the piston during delivery to continue to pressurize the gas-enriched fluid within the receptacle.

32. The method, as set forth in claim 29, wherein the valve comprises a check valve, the check valve having a valve seat and a valve body, and wherein the piston comprises an actuator being moveable in a first direction to move the valve body away from the valve seat and being moveable in a second direction to move the valve body into contact with the valve seat, wherein act (a) comprises the act of:

moving the actuator in the first direction to move the valve body away from the valve seat.

33. The method, as set forth in claim 32, wherein act (b) comprises the act of:

introduced the gas-enriched fluid into the receptacle through the piston when the actuator moves the ball in the first direction.

34. The method, as set forth in claim 29, wherein the valve comprises a check valve, the check valve having a valve seat, a valve body, and a spring, wherein act (b) comprises the act of:

introducing the gas-enriched fluid into the receptacle (through the piston when the fluid overcomes the force of the spring to move the valve body away from the valve seat.

35. The method, as set forth in claim 29, wherein act (a) comprises the act of placing the receptacle within a fluid assembly of a fluid pressurization and delivery system.

36. The method, as set forth in claim 30, wherein the act of advancing the piston creates gas-supersaturated fluid in the receptacle.

37. The method, as set forth in claim 30, wherein the act of advancing the piston comprises the act of driving a piston pusher into contact with the piston.

38. The method, as set forth in claim 37, wherein the act of driving a piston pusher comprises the act of controllably rotating a power screw coupled to the piston pusher.

39. The method, as set forth in claim 29, wherein act (b) comprises the act of advancing the piston until hydrostatic pressure of the gas-enriched fluid reaches a given pressure.

40. A container for gas-supersaturated fluid comprising:

a receptacle for holding gas-supersaturated fluid, the receptacle having a port therein; and

a piston slidably disposed within the receptacle, the piston comprising;

a seal adapted to seal the piston within the receptacle;

a port extending through the piston; and

a valve operatively arranged relative to the port to permit introduction of the fluid into the receptacle.

41. The container, as set forth in claim 40, wherein the valve comprises a check valve, the check valve having a valve seat, a valve body, and a spring, the spring biasing the valve body toward the valve seat.

42. The container, as set forth in claim 41, wherein the fluid may be introduced into the receptacle through the piston when the fluid overcomes the force of the spring to move the valve body away from the valve seat.

43. The container, as set forth in claim 41, wherein the valve comprises a valve seat and a valve body, and wherein the piston comprises an actuator being moveable in a first direction to move the valve body away from the valve seat and being moveable in a second direction to move the valve body into contact with the valve seat.

44. The container, as set forth in claim 43, wherein the fluid may be introduced into the receptacle through the piston when the actuator moves the valve body in the first direction.

45. The container, as set forth in claim 40, wherein the port is adapted to accept a cannula for the introduction of the fluid into the receptacle.

46. The container, as set forth in claim 40, wherein the receptacle comprises a retainer which retains the piston within the receptacle.

47. The container, as set forth in claim 41, wherein the check valve prevents the fluid from escaping from the receptacle.

48. The container, as set forth claim 40, wherein the seal comprises a high pressure seal disposed about a peripheral portion of the piston.

49. The container, as set forth in claim 46, wherein the retainer comprises a piston cap.

50. The container, as set forth in claim 40, wherein the piston comprises a threaded annular recess.

51. The container, as set forth in claim 50, comprising a piston handle adapted to thread to the threaded annular recess of the piston.