| 摘要 |
An introducer system for performing lead replacement includes a reclosable, split sheath introducer. The sheath may preferably be a two-part sheath assembled around an implanted lead body and advanced into an existing venous entry point over an implanted lead. The sheath may optionally be provided with a distal dissecting edge to aid in advancing the introducer through fibrous tissue that may adhere or interfere with the lead. The implanted lead may be removed and a replacement lead may be introduced through the same venous entry point via the introducer. The introducer may then be withdrawn and disassembled from the replacement lead. In alternative embodiments, the introducer may preferably include a one-part sheath having curvilinear overlapping flaps that enclose the sheath lumen but may be parted to allow assembly of the introducer over an implanted lead. Another embodiment of the present invention provides a reclosable, split guide catheter.
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