| 摘要 |
<p>A blade (7) is drawn by means of a rod (6) attached centrally of its cutting edge (9) so that a portion of the blade extends on either side of the rod. An elongate centering device (1) precedes the blade (7) and its protective encasement (10) so as to ensure that the device will not engage side branches of the vein. A catheter (14) follows the valve cutter so that fluid may be introduced into the vein to snap valves shut ahead of the cutting device. The assembly is drawn through a vein by a rod (5) having sufficient torsional rigidity to permit controlled orientation of the blade for efficient engagement and cutting of valve leaflets.</p> |
