Catheter tip to reduce wire lock

• US 20060135979A1
• Filed: 12/16/2004
• Published: 06/22/2006
• Est. Priority Date: 12/16/2004
• Status: Active Grant

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Scimed Life Systems Incorporated (Boston Scientific Corporation)
• Inventors: Eidenschink, Tracee E.J., Pederson, Gary
• Granted Patent: US 7,744,574 B2
• Time in Patent Office: Days
• US Class Current: 606/191
• CPC Class Codes: A61M 2025/0062 having features to improve the sliding of one part within another by using lubricants or surfaces with low friction coatings A61M2025/0046
• CPC Class Codes: A61M 2025/0081 Soft tip
• CPC Class Codes: A61M 25/0068 Static characteristics of the catheter tip, e.g. shape, atraumatic tip, curved tip or tip structure
• CPC Class Codes: A61M 25/008 Strength or flexibility characteristics of the catheter tip
• CPC Class Codes: A61M 25/0082 Catheter tip comprising a tool
• CPC Class Codes: A61M 25/09 Guide wires

Abstract

An elongate medical device and methods for making and using the same. The elongate medical device may be a catheter that includes an elongate tubular shaft having a lumen defined therein. A scraping member is coupled to an inner wall surface of the shaft and extends into the lumen. The scraping member is configured to remove debris that may build up or otherwise be disposed on another medical device such a guidewire.

Claims

1. A medical device, comprising:

an elongate tubular member having a proximal portion, a distal portion, an inner wall surface, and a lumen defined along the inner wall surface; and

a scraping member disposed along the inner wall surface adjacent the distal portion of the tubular member and extending into the lumen.

2. The medical device of claim 1, wherein the scraping member includes a metal, metal alloy, or polymer.

3. The medical device of claim 2, wherein the scraping member includes a radiopaque material.

4. The medical device of claim 1, wherein the distal portion includes a distal end and wherein the scraping member is disposed at the distal end.

5. The medical device of claim 1, wherein the distal portion includes a distal end and wherein the scraping member is disposed proximally of the distal end.

6. The medical device of claim 1, further comprising one or more additional scraping members and wherein each of the scraping members has an inside diameter.

7. The medical device of claim 6, wherein each scraping member has substantially the same inside diameter.

8. The medical device of claim 6, wherein at least two of the scraping members have different inside diameters.

9. The medical device of claim 8, wherein the scraping members each have an inside diameter and wherein the inside diameter of a first scraping member is greater than the inside diameter of a second scraping member positioned distally of the first scraping member.

10. The medical device of claim 1, wherein the scraping member includes a tapered or stepped inside diameter.

11. The medical device of claim 1, wherein the inside diameter of the scraping member is less than the inside diameter of the lumen.

12. The medical device of claim 1, wherein the inside diameter of the scraping member is substantially equal to the inside diameter of the lumen.

13. The medical device of claim 1, wherein the scraping member is tubular.

14. The medical device of claim 1, wherein the scraping member includes a coil.

15. The medical device of claim 1, wherein the scraping member includes a tapered leading edge.

16. The medical device of claim 1, wherein the scraping member is inflatable.

17. The medical device of claim 1, wherein the scraping member includes one or more springs coupled thereto.

18. The medical device of claim 17, wherein the scraping member is inset within a groove defined along the inner wall surface.

19. The medical device of claim 1, wherein the scraping member is adapted to define a variety of inside diameters.

20. A catheter, comprising:

a catheter shaft having a proximal portion, a distal tip portion, an inner wall surface, and a guidewire lumen defined along the inner wall surface; and

a scraping member attached to the inner wall surface adjacent the distal tip and extending into the lumen of the catheter shaft.

21. The catheter of claim 20, wherein the scraping member includes a metal, metal alloy, or polymer.

22. The catheter of claim 20, wherein the distal tip portion includes a distal end and wherein the scraping member is disposed at the distal end.

23. The catheter of claim 20, wherein the distal tip portion includes a distal end and wherein the scraping member is disposed proximally of the distal end.

24. The catheter of claim 20, further comprising one or more additional scraping members.

25. The catheter of claim 20, wherein the scraping member is adapted to define a variety of inside diameters.

26. A catheter and guidewire system designed for reducing guidewire lock, comprising:

an elongate catheter shaft having a guidewire lumen;

a guidewire slidably disposed in the guidewire lumen; and

means for removing debris from the guidewire disposed within the guidewire lumen.

27. A catheter, comprising:

an elongate catheter shaft having a guidewire lumen, the guidewire lumen having an inside diameter;

a guidewire slidably disposed in the guidewire lumen, the guidewire having an outside diameter;

a scraping member coupled to the guidewire lumen, the scraping member having an inside diameter; and

wherein the inside diameter of the scraping member has a first tolerance with the outside diameter of the guidewire, wherein the inside diameter of the guidewire lumen has a second tolerance with the outside diameter of the guidewire, and wherein the first tolerance is tighter than the second tolerance.

28. A method for removing debris from a guidewire, comprising the steps of:

providing a catheter shaft having a proximal portion, a distal tip portion, an inner wall surface, a guidewire lumen defined along the inner wall surface, and a scraping member attached to the inner wall surface adjacent the distal tip and extending into the lumen of the catheter shaft;

advancing the catheter shaft over a guidewire;

wherein debris is clumped on the guidewire; and

bringing the scraping member into contact with the debris clumped on the guidewire so that the scraping member substantially removes the debris from the guidewire.