| 摘要 |
<p>An adjustable intra-luminal valvulotome (10') comprises a hollow tubular member (12) and a pair of substantially identical, opposed cutting blades (18a', 18b') provided at the distal end of the tubular member. Each of the cutting blades has a first cutting blade (60') at its trailing edge (70') and a second cutting blade (62') at one side generally transverse to the first cutting blade. The outer faces (80') of the cutting blades have a complex convex surface. The cutting blades are movable between an extended position and a retracted position with respect to the distal end of the tubular member and between an open position in which the cutting blades are spaced apart from each other and a closed position in which said cutting blades are drawn tightly against each other, by the operation of a pair of spring wires (24, 26) respectively attached to the cutting blades and slidable within the tubular member. The distal end of the tubular member is provided with a receptacle (38') for receiving the first cutting edges of the cutting blades in the retracted position. A coil spring (56) can be provided within the tubular member, through which the spring wires pass, to facilitate movement of the cutting blades between their open and closed positions.</p> |
