| 摘要 |
Disclosed is a heart lead removal apparatus (510) for removing a range of different sized implanted cardiac pacemaker or defibrillator leads (546) fro m the heart, typically through a blood vessel leading to the heart. The lead removal apparatus comprises a stylet (511), an expandable portion (513), and an actuator portion (512) which is manually advanced by the operator to caus e the expandable portion to engage the coils (548) within a pacemaker coil lum en (551). In one preferred embodiment, the expandable portion comprises a multifilar wire bundle (515) that is helically wound around the stylet and attached about the tip (558) thereof. The actuator portion, which comprises an elongate metal cannula attached to a first handle (522), is urged forward to contact the proximal end (545) of the expandable portion, thereby causing th e individual wires (514) of the multifilar wire bundle to deform outward in a random fashion.
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