Set for blood processing

• US 20060173395A1
• Filed: 03/09/2006
• Published: 08/03/2006
• Est. Priority Date: 02/12/2002
• Status: Abandoned Application

• Current Assignee: Nxstage Medical Incorporated (Fresenius Medical Care AG)
• Original Assignee: Nxstage Medical Incorporated (Fresenius Medical Care AG)
• Inventors: Brugger, James M., Schnell, William J., Utterberg, David S., Andrews, G. Keith
• Application Number:
  US11/371,418
• Publication Number:
  US 20060173395A1
• Time in Patent Office: Days
• US Class Current: 604/6.90
• CPC Class Codes: A61M 1/3621 Extra-corporeal blood circuits single-needle circuits A61M1/30
• CPC Class Codes: A61M 1/3627 Degassing devices; Buffer reservoirs; Drip chambers; Blood filters
• CPC Class Codes: A61M 1/3643 Priming, rinsing before or after use
• CPC Class Codes: A61M 1/3644 Mode of operation
• CPC Class Codes: A61M 39/20 Closure caps or plugs for connectors or open ends of tubes

Abstract

A combined arterial and venous blood tubing set is provided for transport of blood between a patient and a blood processing unit. The set comprises an arterial set component comprising arterial tubing having an arterial patient connector at one end and an arterial unit connector at the other. A venous set component has venous tubing with a venous patient connector at one end and a venous unit connector at the other end. The arterial and venous patient connectors, and the arterial and venous unit connectors, are respectively, substantially, and releasably directly connected to each other. As a result of this, the arterial, and venous set components cooperate to form a loop. Other features of improved sets are also disclosed.

Claims

1. A tubular medical fluid set comprising a bubble trap chamber having a top wall and a side wall, said top wall defining a port which communicates with flow tubing, said port communicating with a port tube extending longitudinally into said chamber adjacent to said side wall, said port tube forming a baffle whereby medical fluid entering said chamber through said port is directed through the port tube and circumferentially about said chamber side wall and the baffle causing a turbulent flow.

2. The tubular set of claim 1 wherein the chamber includes a second baffle for interrupting the circumferential flow.

3. The tubular set of claim 1 wherein the chamber provides for an airspace at the top wall.

4. The tubular set of claim 1 wherein the port tube includes an inner tube spaced below the wall, the inner tube including an end having an aperture that directs flow circumferentially out of the inner tube end.

5. The tubular set of claim 4 wherein the port tube is formed by a tubular wall and the aperture is formed at least partially in the tubular wall.

6. A tubular medical fluid set comprising an in-line bubble trap chamber having a top wall and a tubular side wall, said top wall defining a port which communicates with flow tubing of said tubular set, said port directing flow circumferentially into said bubble trap chamber, whereby medical fluid entering said chamber through said port is directed circumferentially about said chamber side wall and a baffle disposed within the chamber to cause a turbulent flow, to prevent formation of a whirlpool.

7. The tubular set of claim 6 wherein the flow tubing forms the baffle.

8. The tubular set of claim 6 wherein the port forms the baffle.

9. The tubular set of claim 6 wherein the port comprises a port tube that extends longitudinally into the chamber adjacent the sidewall and receives medical fluid from the flow tubing.

10. The tubular set of claim 9 wherein a portion of the port tube forms the baffle.

11. The tubular set of claim 9 further comprising a component disposed within the chamber and the component forms the baffle.

12. The tubular set of claim 9 wherein the chamber includes multiple baffles.

13. The tubular set of claim 6 wherein the chamber includes air trapped therein.

14. The tubular set of claim 6 wherein microbubbles are disposed within the chamber.

15. The tubular set of claim 6 wherein air is vented out of the chamber.

16. The tubular set of claim 6 in which said chamber defines a liquid level therein having a predetermined air volume which has a volume of at least 4 cc.

17. A tubular medical fluid set comprising a bubble trap chamber having a top wall, a port communicating with flow tubing of the tubular set, said port communicating with a port tube extending into said chamber, said port tube having an aperture spaced below said top wall, said aperture being positioned to direct flow out of said tube circumferentially into the bubble trap chamber, whereby blood entering said chamber through said aperture is directed circumferentially about said chamber, said chamber having a component which serves as a baffle, said baffle being radially outwardly spaced from a center of said chamber and extending longitudinally along an upper portion of said chamber and the baffle causes turbulent flow at the level of said baffle.

18. The tubular set of claim 17 wherein the aperture is formed at an inner tube end of the port tube.

19. The tubular set of claim 17 wherein the aperture is formed in a side of the port tube.

20. The tubular set of claim 17 wherein the port tube forms the baffle.

21. The tubular set of claim 17 wherein the chamber includes multiple baffles.

22. The tubular set of claim 17 in which said baffle comprises a tube that is joined to an inner surface of a side wall of said bubble trap.

23. The tubular set of claim 22 in which said port tube also extends longitudinally and comprises a tube that is joined to an inner surface of a side wall of said bubble trap.

24. The tubular set of claim 17 in which said chamber defines a liquid level therein having a predetermined air volume which has a volume of at least 4 cc.

25. The tubular set of claim 17 in which said port tube also extends longitudinally and comprises a tube that is joined to an inner surface of a side wall of said bubble trap.

26. A bubble trap chamber comprising:

a port for receiving blood and whereby blood entering said chamber through said port is directed circumferentially about said chamber,

a first chamber portion defining a turbulent blood area where interference with the circumferential flow of blood is provided at a position that is radially outwardly spaced from a center of the chamber; and

a second chamber portion defining a circumferential flow area where a substantially circumferential flow of blood is provided and air bubbles in the blood rise from the circumferential flow area upwardly through the turbulent blood area.

27. The bubble trap chamber of claim 26 further comprising a top wall and the port disposed in the top wall.

28. The bubble trap chamber of claim 26 further comprising a port tube extending longitudinally into the chamber and in communication with the port, the port tube extending through the first chamber portion and into the second chamber portion.

29. The bubble trap chamber of claim 28 wherein the port tube includes an aperture that is oriented at an end of the port tube and the aperture expels blood into the second chamber portion in a substantially circumferential flow.

30. The bubble trap chamber of claim 26 further comprising a baffle disposed within the chamber within the first chamber portion, the baffle interfering with the substantially circumferential flow of blood and creating turbulence.

31. The bubble trap chamber of claim 26 further comprising a longitudinal axis of the chamber and a port tube extending longitudinally into the chamber substantially parallel to the longitudinal axis and radially spaced from the longitudinal axis.

32. The bubble trap chamber of claim 26 wherein the first chamber portion is located at a different height within the chamber than the second chamber portion.

33. The bubble trap chamber of claim 26 in which said blood in said chamber below said first chamber portion is free to flow circumferentially without direct interference by a baffle.

34. The bubble trap chamber of claim 26 further comprising a baffle disposed in the chamber that comprises a tube other than said port, said other tube being joined to an inner surface of a side wall of said bubble trap chamber.

35. The bubble trap chamber of claim 26 further comprising an aperture formed by a port tube in communication with the port and in which said aperture defines a single flow inlet.

36. The bubble trap chamber of claim 35 wherein the aperture is formed in a side wall of the port tube.

37. A method of processing fluid between turbulent and non-turbulent areas in a chamber, the method comprising the steps of:

providing a chamber having a port and a baffle;

receiving a fluid flow through the port;

expelling fluid from the port into the chamber in a substantially circumferential flow; and

interfering with the substantially circumferential flow of fluid by exposure to the baffle at a position that is radially outwardly spaced from a center of the chamber in order to provide a substantially turbulent flow in a first area that is spaced from a second area of less turbulent flow.

38. The processing method of claim 37 further comprising the steps of:

forming a partially circumferential flow in the second area;

driving microbubbles from the second area to the first area; and

causing the microbubbles to rise upwardly through the turbulent flow.

39. The processing method of claim 37 wherein the chamber includes a port tube extending into the chamber from the port, and the port tube includes an aperture for expelling the fluid into the chamber in a substantially circumferential flow.

40. The processing method of claim 37 further comprising the step of causing microbubbles to rise into an airspace at top of the chamber.

41. The processing method of claim 37 further comprising the step of venting microbubbles out of the chamber.

42. A protector for a female luer connector, which comprises:

an outer sleeve, a central transverse wall defined in said outer sleeve, a male luer projecting axially within said sleeve from said transverse wall to engage said female luer connector within the sleeve;

a tube projecting axially within said sleeve from said transverse wall in the direction opposed to said male luer, said tube and male luer having connected lumens, said tube having an outer end that is substantially recessed within said sleeve.

43. The protector of claim 42 in which said sleeve has an inner wall free of screw threads.

44. The protector of claim 43 in which said sleeve inner wall defines axially extending ribs to facilitate axially sliding connection and retention with a female luer connector.

45. The protector of claim 42 in which said tube outer end terminates at a point no more than about two thirds of the distance from the transverse wall to the end of the tube opposed to said male luer.

46. The protector of claim 45 in which a hinged cap is attached to said outer sleeve in a position permitting closure of said cap over the outer sleeve end that is opposed to said male luer.

47. The protector of claim 42 in which said sleeve has an inner wall free of screw threads, said inner wall defining axially extending ribs to facilitate axially sliding connection and retention with a female luer connector, said tube outer end terminating at a point no more than about two-thirds of the distance from the transverse wall to the end of the tube opposed to said male luer.

48. The protector of claim 47 in which a hinged cap is attached to said outer sleeve in a position permitting closure of said cap over the outer sleeve end that is opposed to said male luer.