Reinforced venous access catheter

• US 20060020256A1
• Filed: 07/20/2004
• Published: 01/26/2006
• Est. Priority Date: 07/20/2004
• Status: Active Grant

• Current Assignee: AngioDynamics, Inc.
• Original Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Inventors: Lareau, Raymond, Bell, Barbara, Bourne, George, Dimatteo, Kristian
• Granted Patent: US 7,850,675 B2
• Time in Patent Office: Days
• US Class Current: 604/523
• CPC Class Codes: A61M 2025/0031 characterized by lumina for withdrawing or delivering, i.e. used for extracorporeal circuit treatment
• CPC Class Codes: A61M 2025/0037 characterized by lumina being arranged side-by-side
• CPC Class Codes: A61M 2025/0059 having means for preventing the catheter, sheath or lumens from collapsing due to outer forces, e.g. compressing forces, or caused by twisting or kinking
• CPC Class Codes: A61M 2025/0063 having means, e.g. stylets, mandrils, rods or wires to reinforce or adjust temporarily the stiffness, column strength or pushability of catheters which are already inserted into the human body
• CPC Class Codes: A61M 25/0045 multi-layered, e.g. coated coating materials A61L29/08
• CPC Class Codes: A61M 25/0052 Localized reinforcement, e.g. where only a specific part of the catheter is reinforced, for rapid exchange guidewire port
• CPC Class Codes: A61M 25/0069 Tip not integral with tube

Abstract

A catheter for medical procedures comprises a shaft portion having a distal end insertable into a body lumen, the shaft portion having a wall defining a working lumen extending therewithin and a first strengthening element coupled to the wall to increase a burst pressure of the shaft portion, wherein the first strengthening element cooperates with a base material of the wall to define a flexible region of the shaft portion allowing the shaft portion to be atraumatically inserted into the body lumen.

Claims

1. A catheter for medical procedures comprising:

a shaft portion having a distal end insertable into a body lumen, the shaft portion including a wall defining a working lumen extending therewithin; and

a first strengthening element coupled to the wall to increase a burst pressure of the shaft portion, wherein the first strengthening element cooperates with a base material of the wall to define a flexible region of the shaft portion allowing the shaft portion to be atraumatically inserted into the body lumen.

2. The catheter according to claim 1, wherein the first strengthening element comprises a braid forming a tubular shell around at least a portion of the working lumen.

3. The catheter according to claim 2, wherein the braid is embedded in the base material of the wall.

4. The catheter according to claim 2, wherein the braid is disposed around an outer surface of the wall.

5. The catheter according to claim 1, wherein the wall comprises a reinforced portion and a non-reinforced portion separated from one another longitudinally along an axis of the shaft portion.

6. The catheter according to claim 2, wherein the braid is made of metal.

7. The catheter according to claim 2, wherein the braid is made of stainless steel.

8. The catheter according to claim 2, wherein the braid is made of Nitinol.

9. The catheter according to claim 2, wherein the braid is made of a polymer material.

10. The catheter according to claim 2, wherein the braid is made of a polyolefin.

11. The catheter according to claim 2, wherein the braid is made of kevlar.

12. The catheter according to claim 2, wherein the braid is made of vectran.

13. The catheter according to claim 2, wherein the braid is made of silk.

14. The catheter according to claim 1, wherein the wall is formed of a first layer of material having a durometer value increased with respect to material comprising a second layer of the wall, the first layer forming the first strengthening element.

15. The catheter according to claim 14, wherein the second layer extends radially outward of the first layer.

16. The catheter according to claim 14, wherein the first layer is adjacent to the working lumen.

17. The catheter according to claim 14, wherein the second layer comprises a thermoplastic polyurethane and the first layer comprises a polyether block-amide.

18. The catheter according to claim 14, wherein the first and second layers are coextruded.

19. The catheter according to claim 1, wherein the first strengthening element comprises reinforcing particles dispersed within the base material of the wall.

20. The catheter according to claim 1, wherein the first strengthening element comprises cross linking agents incorporated in the base material fo the wall and activated to strengthen the wall.

21. The catheter according to claim 1, further comprising an extension tube including a second strengthening element.

22. The catheter according to claim 1, wherein the first strengthening element is shorter than the shaft portion.

23. The catheter according to claim 1, wherein the burst pressure of the catheter is greater than about 300 PSI.

24. The catheter according to claim 1, further comprising a designed failure point adapted to fail at a pressure below the burst pressure of the catheter.

25. The catheter according to claim 24, further comprising an extension tube, the designed failure point being disposed on the extension tube.

26. The catheter according to claim 24, wherein the failure point is a reduced thickness portion of the wall.

27. The catheter according to claim 24, wherein the failure point is defined by a region of irregular geometry of at least one of inner and outer cross sections of the wall.

28. A peripherally inserted central catheter comprising:

a shaft formed of a flexible base material;

a strengthening element coupled to the shaft to raise a burst pressure of the shaft above a pressure generated during power injection; and

a flexible portion of the shaft allowing the shaft to be atraumatically navigated through a body lumen.

29. The central catheter according to claim 28, wherein the strengthening element comprises a first layer of material having a durometer value higher than that of a second layer of material.

30. The central catheter according to claim 29, wherein the first and second layers are disposed radially relative to one another to form a wall of the shaft.

31. The central catheter according to claim 29, wherein the first layer is radially within the second layer.

32. The central catheter according to claim 29, wherein an outer layer of lower durometer material defines the flexible portion.

33. The central catheter according to claim 28, wherein the strengthening element comprises a braid of material forming a tubular shell around a working lumen of the catheter.

34. The central catheter according to claim 33, wherein the braid is embedded in the base material.

35. The central catheter according to claim 33, wherein the braid is disposed on an outer surface of the shaft.

36. The central catheter according to claim 33, wherein the braid is formed of metal.

37. The central catheter according to claim 33, wherein the braid is formed of stainless steel.

38. The central catheter according to claim 33, wherein the braid is formed of Nitinol.

39. The central catheter according to claim 33, wherein the braid is formed of polymer material.

40. The central catheter according to claim 33, wherein the braid is formed of a polyolefin.

41. The central catheter according to claim 33, wherein the braid is formed of kevlar.

42. The central catheter according to claim 33, wherein the braid is formed of vectran.

43. The central catheter according to claim 33, wherein the braid is formed of silk.

44. The central catheter according to claim 33, wherein the braid extends along a proximal portion of the shaft.

45. The central catheter according to claim 28, wherein the atraumatic portion comprises a distal end of the shaft.

46. The central catheter according to claim 33, wherein the strengthening element does not extend along the atraumatic portion.

47. The central catheter according to claim 28, wherein the strengthening element comprises micro particles added to the base material in selected regions.

48. The central catheter according to claim 47, wherein the micro particles comprise one of clay and fumed silica.

49. The central catheter according to claim 28, wherein the strengthening element comprises cross linking agents disposed within the base material and activated to strengthen the wall.

50. The central catheter according to claim 31, wherein the first layer comprises a polyether block-amide.

51. The central catheter according to claim 32, wherein the second layer comprises a thermoplastic polyurethane.

52. The central catheter according to claim 28, further comprising a designated failure point on one of the shaft and an extension tube of the catheter, the designated failure point being adapted to fail at a pressure less than a burst pressure of the rest of the catheter.

53. The central catheter according to claim 52, wherein the designated failure point comprises a reduced thickness portion of the wall.

54. The central catheter according to claim 52, wherein the designated failure point comprises a region of irregular cross section of the wall.