| 摘要 |
A vascular stent (8) for reducing hemodynamic disturbances caused by angioplasty. In one aspect, the stent is formed from a single, continuous filament (11) having a series of U-shaped bends (1-7'). The filament (11) is wrapped around a mandril (31), in a circular fashion, to align the curved portions of each bend (1-7') which are then connected. In another aspect of the vascular stent, the filament is formed into a substantially tubular body (22) having a plurality of oblong, open cells which are staggered around the circumference of the tube. When the body is formed in its unexpanded state, the long sides (14) of each oblong cell (39) are arranged substantially parallel to the longitudinal axis of the tubular body. The filament is preferably bonded at the point of tangency between adjacent sides (34, 36 and 38, 40) of a cell (39). When the body is expanded, the adjacent sides (34, 36) of each cell (39) extend oblique to the longitudinal axis of the body. In yet another aspect of the vascular stent, the single, continuous filament or wire is half-round (i.e., semi-circular) in transverse cross-section. In a completed stent, the semicircular wire profiles (25) are all on the exterior of the stent body while the planar portions (27) of the wire are all on the interior for providing a generally smooth interior surface. 39 |
