| 摘要 |
Heart lead removal apparatus is disclosed for removing a heart lead from the wall of a heart through a blood vessel leading to the heart. The apparatus comprises a flexible stylet wire with an expandable wire coil attached to the distal end for engaging the coiled structure of the heart lead. The stylet wire is inserted in the longitudinal passageway of the coiled structure to the distal end of the heart lead where the tip is typically secured to the heart wall with a number of tines formed from the insulating material surrounding the coiled structure. When inserted, the stylet wire is rotated in a direction to unwind and expand the wire coil and engage the heart lead coiled structure, thereby securing the stylet wire to the heart lead. A separator tube is inserted over the proximal end of the stylet wire and the heart lead and moved along the entire length of the heart lead to first separate the restricted heart lead from the blood vessel leading to the heart cavity. When fully inserted, the separator tube is positioned against the heart cavity wall, and the stylet wire is pulled while the separator tube is rotated back and forth to separate the heart lead tip from the heart wall. The separator tube, stylet wire, and heart lead are then removed from the heart cavity and blood vessel without causing any significant injury to the heart cavity wall.
|
