| 摘要 |
Catheters and methods for supporting a guidewire or delivering a radiopaque, diagnostic or therapeutic agent through a vessel stenosis or other tortuous anatomy are disclosed. A catheter can comprise an elongate shaft body and a tip member disposed at a distal end of the shaft body. The shaft body can extend from a proximal end to the distal end and can define an inner lumen. The shaft body can include a liner, a braid member surrounding the liner, a multi-layer coil surrounding the braid member, and a polymer cover surrounding the multi-layer coil. The multi-layer coil can include first and second coil layers wound in opposing directions. An outer surface portion of the polymer cover can include one or more helical threads. In an example, the one or more helical threads are positioned around a distal end portion of the shaft body. The tip member can be made from a metal or a polymer and can also include one or more helical threads around its outer surface. |
| 主权项 |
1. A catheter, comprising:
an elongate shaft body extending from a proximal end to a distal end and defining an inner lumen, the shaft body including a liner, a braid member surrounding the liner, a multi-layer coil surrounding the braid member, and a polymer cover surrounding the multi-layer coil, the multi-layer coil including a first coil layer and a second coil layer surrounding the first coil layer, a proximal end of each of the first and second coil layers extending from a proximal portion of the shaft body to the shaft body's distal end, a distal end of each of the liner, the braid member, and the first and second coil layers extending beyond the distal end of the shaft body, a distal outer surface portion of the polymer cover of the shaft body including one or more helical threads configured to urge movement of the shaft body within vasculature via rotation applied to the shaft body's proximal end; and a tip member disposed at the distal end of the shaft body. |
