| 摘要 |
A self-expanding stent delivery system (10) for medical treatment of a patient comprises a catheter system (12) with an elongate flexible shaft and a stent (24) mounted about the shaft near the distal end (16), the shaft having an inner member (26), a tubular sheath (28) surrounding a portion of the inner member (26), and a flexible tapered tip (18) affixed to a distal end of the inner member (26). A portion of the sheath (28) surrounds and compresses the self-expanding stent (24) during an initial configuration, in which a distal end of the sheath (28) touches the tapered tip (18). The tip (18) has a distal tapered surface (54) tapering from a narrow distal dimension to a wider base dimension comparable to a distal dimension of the sheath (28), the tip (18) further having a collar (76) smaller than the base dimension and reverse taper (74) narrowing from the base dimension to the collar (76) in a proximal directions. |
