| 摘要 |
A small-diameter surgical snare device (10) that is capable of fitting through existing balloon or guiding catheters includes metal tubing (12) along a section of a core wire (14). The distal end of the core wire (14) connects to one or more snare wires (50, 52) that form the snaring loop (16). The distal end of the snaring loop (16) supports a radiopaque coil or collar (25) that makes the end of the loop (16) visible under fluoroscopy. The snaring loop (16) may consist of one or two wires (50, 52) of an overlap of a tapered end of the core wire (14). A radiopaque coil (24) is attached to a distal end of the metal tubing (12), to provide flexibility and visibility to a distal region of the device. Alternatively, a polyimide tube and a short radiopaque marker may be includes at a distal end of the metal tubing. The polyimide tube fits inside of the metal tubing, to add strength and torsion control to the distal region of the device, while the radiopaque marker adds visibility. In all embodiments, a shrink tube is fit over the radiopaque coil or marker that is supported by the distal end of the metal tubing, to ensure that the coil does not stretch when the snaring loop is extended during use. |
