Helically advancing constriction crossing mechanism and wire guide positioning method for performing percutaneous vascular procedures

摘要

A vascular procedure includes sliding a constriction crossing mechanism over a wire guide having a tip positioned at a proximal side of a constriction, and rotating a sheath of the mechanism about an axis relative another sheath of the mechanism. The method further includes helically engaging the sheaths, and guiding an intraluminal treatment device into or past the constriction. The mechanism includes a first sheath and a second sheath, and a tip coupled with the first sheath. The mechanism further includes a helical coupling between the first and second sheaths, which is configured to convert a torque on one of the sheaths to an axial force on the other of the sheaths for crossing a vascular constriction with the tip. An anchoring mechanism coupled with one of the sheaths includes a deployed state resisting displacement of the second sheath within a vascular structure of a patient.

主权项

1. A method of performing a percutaneous vascular procedure on a patient comprising the steps of:
sliding a vascular constriction crossing mechanism in a proximal to distal direction over a wire guide having a wire guide tip positioned at a first location on a proximal side of a vascular constriction; rotating one of a first sheath of the vascular constriction crossing mechanism and a second sheath of the vascular constriction crossing mechanism about an axis of rotation relative to the other of the first sheath and the second sheath; advancing a constriction crossing tip of the first sheath through the vascular constriction to a second location which is distal to the first location responsive to the rotating step and a helical engagement between threads of the first sheath and threads of the second sheath; and guiding an intraluminal treatment device to the second location.