Catheter tip to reduce wire lock
View Patent ↗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.
1. An intravascular catheter and guidewire system designed for reducing guidewire lock, comprising:
an elongate tubular member having a proximal portion, a distal portion, an inner wall surface, and a lumen having a first inner diameter defined along the inner wall surface;
a guidewire slidably disposed in the lumen, the guidewire having an outside diameter;
a hub disposed adjacent the proximal portion of the tubular member; and
a tubular rigid scraping member, the rigid scraping member having a second inner diameter and a continuous inner wall surface and a continuous outer surface, the outer surface of the rigid scraping member disposed along the inner wall surface of the tubular member adjacent the distal portion of the tubular member and extending into the lumen, wherein the scraping member is configured to provide radial reinforcement of the distal portion;
wherein the first inner diameter is approximately 0.010 inches to 0.020 inches and the second diameter is approximately 0.008 inches to 0.018 inches; and
wherein the second inner diameter of the scraping member has a first tolerance with the outside diameter of the guidewire, wherein the first inner 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.
2. 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.
3. 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.
4. The medical device of claim 1 , wherein the scraping member includes a tapered inside diameter.
5. The medical device of claim 1 , wherein the inside diameter of the scraping member is less than the inside diameter of the lumen.
6. The medical device of claim 1 , wherein the inside diameter of the scraping member is substantially equal to the inside diameter of the lumen.
7. The medical device of claim 1 , wherein the scraping member includes a tapered leading edge.
8. The medical device of claim 1 , wherein the scraping member is inset within a groove defined along the inner wall surface.
9. The medical device of claim 1 , wherein the scraping member is adapted to define a variety of inside diameters.
10. The medical device of claim 1 , wherein the scraping member includes a lubricious coating disposed on the inner wall surface.
11. The medical device of claim 1 , wherein the scraping member includes a metal, metal alloy, or polymer.
12. The medical device of claim 11 , wherein the scraping member includes a radiopaque material.
13. 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.
14. The medical device of claim 13 , wherein each scraping member has substantially the same inside diameter.
15. The medical device of claim 13 , wherein at least two of the scraping members have different inside diameters.
16. The medical device of claim 15 , 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.