Forwardly directable fluid jet crossing catheter

• US 20080319386A1
• Filed: 08/10/2007
• Published: 12/25/2008
• Est. Priority Date: 06/20/2007
• Status: Abandoned Application

• Current Assignee: Medrad Incorporated (Bayer AG)
• Original Assignee: Possis Medical, Inc. (Bayer AG)
• Inventors: Morris, David B., Kozak, Debra M., Bonnette, Michael J., Thor, Eric J.
• Application Number:
  US11/891,450
• Publication Number:
  US 20080319386A1
• Time in Patent Office: Days
• US Class Current: 604/95.02
• CPC Class Codes: A61B 17/32037 for removing obstructions from inner organs or blood vessels, e.g. for atherectomy
• CPC Class Codes: A61B 2017/003 Steerable
• CPC Class Codes: A61B 2017/00331 with preformed bends
• CPC Class Codes: A61B 2017/00867 shape memory effect for prostheses A61F2210/0014
• CPC Class Codes: A61B 2017/22094 for crossing total occlusions, i.e. piercing

Abstract

A forwardly directable fluid jet crossing catheter having a positionable jet body which can be longitudinally and rotationally positioned in order to direct a fluid jet stream to impinge, break through, and cross a chronic total occlusion. The distal end of the catheter includes a tip of super-elastic material having a flexible bend aligned within the distal portion of a sheath which tip is directable in response to the longitudinal and rotational orientation of a positionable jet body, whereby a fluid jet stream can be controlled in angular and rotational directions.

Claims

1. A fluid jet crossing catheter comprising an elongated flexible catheter tube attached to an operating handle, said catheter tube including a flexible, elongated tubular member having a proximal end and a distal end, said operating handle having an elongated tubular body with a proximal end and a distal end, said proximal end of said flexible, elongated tubular member being connected through the distal end of said elongated tubular body, a flexible, high pressure, elongated tube extending from within said elongated tubular body and through said flexible, elongated, tubular member, said flexible, high pressure, elongated tube having a movable tip which can be extended beyond said distal end of said flexible, elongated tubular member, said flexible, high pressure, elongated tube having a bent portion within said flexible, elongated tubular member, and said movable tip being controlled by a mechanism associated with said operating handle.

2. The fluid jet crossing catheter of claim 1, wherein said flexible, elongated tubular member has a first elongated tubular section and a second elongated tubular section, said first tubular section having a proximal end and a distal end, said second tubular section having a proximal end and a distal end, said proximal end of said first tubular section being attached to said distal end of said elongated tubular body, said distal end of said first elongated tubular section being attached to said proximal end of said second elongated tubular section.

3. The fluid jet crossing catheter of claim 2, wherein said bent portion of said flexible high pressure tube is located within said second elongated tubular section.

4. The fluid jet crossing catheter of claim 1, wherein said mechanism of said operating handle for controlling said movable tip includes a slideable and rotatable tubular actuator external to said elongated tubular body and a slideable and rotatable tubular mount internal to said elongated tubular body, said flexible, high pressure, elongated tube being fixedly attached to said internal tubular mount and said external tubular actuator and said internal tubular mount being in operative mechanical conjunction with each other to move said movable tip externally of said distal end of said second elongated tubular section in either a horizontally forward or rearward direction or in a rotational direction.

5. The fluid jet crossing catheter of claim 1, wherein said operating handle has a bored adapter sealed to the proximal end of said elongated tubular body and a tubular connector sealed to said bored adapter for the input of a pressurized fluid into said flexible, high pressure, elongated tube within said elongated tubular body.

8. The fluid jet crossing catheter of claim 1, wherein said flexible, high pressure, elongated tube has a third elongated tubular section and a fourth elongated tubular section, said third and fourth elongated tubular sections being connected to each other in tandem.

9. The fluid jet crossing catheter of claim 8, wherein said bent portion is within said second elongated tubular section.

10. The fluid jet crossing catheter of claim 9, wherein said third elongated tubular section is joined to said fourth elongated tubular section within said second elongated tubular section on the proximal side of said bent portion.

11. The fluid jet crossing catheter of claim 8, wherein said third tubular section is made from stainless steel and said fourth tubular section is made from nitinol.

12. The fluid jet crossing catheter of claim 11, wherein said tip, at said distal end of said fourth elongated tubular section, is annealed.

13. The fluid jet crossing catheter of claim 9, wherein portions of said fourth tubular section adjacent said bent portion are super-elastic as well as said bent portion.

14. The fluid jet crossing catheter of claim 5, wherein said flexible, elongated, high pressure tube includes a flexible tubular coil extending between said tubular connector and said flexible, elongated, high pressure tube, said flexible tubular coil forming an integral part of said flexible, elongated, high pressure tube.

15. The fluid jet crossing catheter of claim 2, wherein said distal end of said first elongated tubular section is attached to said proximal end of said second elongated tubular section by insertion thereof a short distance into said proximal end of said second elongated tubular section and is secured thereto by an adhesive, electric welding or some other suitable means.

16. The fluid jet crossing catheter of claim 2, wherein said first elongated tubular section has a curved indenture in the periphery thereof near its distal end for insertion of a guidewire tube which extends internally from said proximal end of said second elongated tubular section to said distal end of said second elongated tubular section.

17. The fluid jet crossing catheter of claim 1, wherein there is a radiopaque marker band on said movable tip and at least one radiopaque marker band on said flexible, elongated tubular member.

18. The fluid jet crossing catheter of claim 1, wherein said operating handle has a flexible strain relief member sealingly attached to the distal end of said elongated tubular body, said flexible strain relief member having a bore therethrough and a conically shaped outer surface wherein said flexible, elongated, tubular member extends through said bore.

37. The fluid jet crossing catheter of claim 4, wherein there is a threaded hole located approximately midway between the ends of said tubular actuator for insertion of an index screw cooperating with a key bore in said tubular mount to fixedly prevent the movement thereof or cooperating with a limit slot in said elongated tubular body to limit the rotational and longitudinal movement of said internal tubular mount.

6. (canceled)

7. (canceled)

19. A fluid jet crossing catheter comprising an elongated flexible catheter tube attached to an operating handle, said catheter tube including a flexible, elongated, tubular member having a proximal end and a distal end, said operating handle having an elongated tubular body with a proximal end and a distal end, said elongated tubular body having a bored adapter sealed to the proximal end of said elongated tubular body and a tubular connector sealed to said bored adapter for the input of a pressurized fluid, a flexible, high pressure, elongated tube being fixed to said bored adapter and in fluid communication with said tubular connector, said flexible, high pressure, elongated tube extending from said bored adapter, through said elongated tubular body, through said distal end of said elongated tubular body and through said elongated tubular member, said flexible, high pressure, elongated tube having a movable tip at said distal end of said flexible, elongated tubular member which movable tip can be extended beyond said distal end of said flexible, elongated tubular member, said flexible, high pressure, elongated tube having a bent portion within said flexible, elongated tubular member, and said movable tip being controlled by a mechanism associated with said operating handle.

20. The fluid jet crossing catheter of claim 19, wherein said mechanism includes a control wire having a proximal end and a distal end, said proximal end of said control wire being fixedly attached internally of said elongated tubular body and said distal end of said control wire being fixedly attached to and adjacent said bent portion within said flexible, elongated tubular member.

21. The fluid jet crossing catheter of claim 20, wherein said mechanism of said operating handle for controlling said movable tip further includes a slideable and rotatable tubular actuator external to said elongated tubular body and a slideable and rotatable tubular mount internal to said elongated tubular body, said slideable and rotatable tubular mount having a proximal end and a distal end, said proximal end of said control wire having an off center portion fixedly attached to said distal end of said slideable and rotatable tubular mount, said distal end of said control wire being fixedly attached to said flexible, high pressure, elongated tube adjacent the downstream side of said bent portion of said flexible, high pressure, elongated tube, said tubular actuator and said tubular mount being in operative mechanical conjunction with each other to move said control wire in a horizontal or rotational direction whereby said movable tip is moved externally of said distal end of said flexible, elongated, tubular member in either a horizontally forward or rearward direction or in a rotational direction.

22. The fluid jet crossing catheter of claim 21, wherein said flexible, elongated tubular member has a first elongated tubular section and a second elongated tubular section, said first elongated tubular section having a proximal end and a distal end, said second elongated tubular section having a proximal end and a distal end, said proximal end of said first section being attached to said distal end of said elongated tubular body, said distal end of said first section being attached to said proximal end of said second section.

23. The fluid jet crossing catheter of claim 22, wherein said bent portion of said flexible, high pressure, elongated tube is located within said second tubular section.

26. The fluid jet crossing catheter of claim 19, wherein said flexible, high pressure, elongated tube has a third elongated tubular section and a fourth elongated tubular section, said third and fourth elongated tubular sections being connected to each other.

27. The fluid jet crossing catheter of claim 26, wherein said bent portion is within said second elongated tubular section.

28. The fluid jet crossing catheter of claim 27, wherein said third elongated tubular section is joined to said fourth elongated tubular section within said second elongated tubular section on the proximal side of said bent portion.

29. The fluid jet crossing catheter of claim 28, wherein said third tubular section is made from stainless steel and said fourth tubular section is made from nitinol.

30. The fluid jet crossing catheter of claim 29, wherein said movable tip, at said distal end of said second section, is annealed.

31. The fluid jet crossing catheter of claim 30, wherein a portions of said fourth tubular section proximal to said bent portion are super-elastic as well as said bent portion.

32. The fluid jet crossing catheter of claim 19, wherein said distal end of said first elongated tubular section is attached to said proximal end of said second elongated tubular section by insertion thereof a short distance into said proximal end of said second elongated tubular section and is secured thereto by an adhesive, electric welding or some other suitable means.

33. The fluid jet crossing catheter of claim 32, wherein said first tubular section has a curved indenture in the periphery thereof near its distal end for insertion of a guidewire tube which extends internally from said proximal end of said second elongated tubular section to said distal end of said second elongated tubular section.

34. The fluid jet crossing catheter of claim 19, wherein there is a radiopaque marker band on said movable tip and at least one radiopaque marker band on said first elongated tubular section.

35. The fluid jet crossing catheter of claim 19, wherein said elongated tubular body has a flexible strain relief member sealingly attached to the distal end thereof, said flexible strain relief member having a bore therethrough and a conically shaped outer surface wherein said flexible, elongated, tubular member extends through said bore.

36. The fluid jet crossing catheter of claim 21, wherein there is a threaded hole located approximately midway between the ends of said tubular actuator for insertion of an index screw cooperating with a key bore in said tubular mount to fixedly prevent the movement thereof or cooperating with a limit slot in said elongated tubular body to limit the rotational and longitudinal movement of said internal tubular mount.

24. (canceled)

25. (canceled)