| 摘要 |
A vascular dilatation device for enlarging a flow passage in an obstruction in a vessel carrying flowing blood. A flexible cylindrical dilatation member is provided for placement in the obstruction and has first and second ends and an intermediate portion between the first and second ends with an interior flow passage extending therethrough having a diameter and a longitudinally extending central axis. The diameter of the flow passage is variable with movement of the first and second ends relative to each other along the longitudinally extending central axis from a contracted position to an expanded condition. The flexible cylindrical dilatation member is comprised of a plurality of flexible elongate elements each of which extends helically about the longitudinally extending central axis. First and second collars respectively engage the first and second ends of the flexible cylindrical dilatation member to retain the first and second ends in contracted positions. A mechanism is provided for causing relative axial movement of the first and second ends towards each other to cause an intermediate portion of the flexible cylindrical dilatation member to expand to form a rigid cylinder and thereby enlarge the obstruction spaces between the flexible elongate elements at the first and second ends so that blood in the vessel can continue to flow through said first and second ends and through the interior flow passage. |
