Lumen reentry mechanism and method

摘要

A lumen reentry mechanism includes a catheter configured to bypass an area of stenosis, and having a longitudinal passage with a side hole. A piercing tool is positioned within the passage and has a transverse end section with a cutting tip, trapped between first and second longitudinally extending beads within the passage. Trapping of the piercing tool limits contact between the cutting tip and an inner surface of the catheter. Related methodology is also disclosed.

主权项

1. A lumen reentry mechanism comprising:
a catheter including an elongate tubular body for bypassing an area of stenosis in a vein or artery via a subintimal space, the elongate tubular body having a proximal body end and a distal body end, and defining a longitudinal axis, a passage extending longitudinally between the proximal and distal body ends, and a side hole connecting with the passage; the elongate tubular body further having a first and a second bead extending longitudinally between the proximal body end and the side hole, and projecting into the passage; and a piercing tool within the passage including an elongate proximal shaft section oriented substantially parallel to the longitudinal axis, and an attached distal end section oriented transverse to the elongate proximal shaft section and having a cutting tip configured to exit the side hole for forming a reentry opening from the subintimal space to a lumen of the vein or artery; the piercing tool being slidable within the passage from a first position to an advanced position at which the cutting tip is in axial alignment with the side hole, and the distal end section being trapped between the first and second beads such that contact between the cutting tip and the elongate tubular body is limited during the sliding of the piercing tool.