Occlusion crossing device and method

摘要

A stent delivery catheter for positioning a stent across a lesion of a blood vessel is disclosed. The catheter includes an inflation balloon coupled to a distal region of the elongate shaft of the catheter and a stent loaded on the inflation balloon. The catheter may also include an occlusion balloon having a proximal waist secured to the elongate shaft and a distal waist secured to the elongate shaft. The occlusion balloon includes a first folded-over portion extending distal of the distal waist to a distalmost extent of the occlusion balloon and a second folded-over portion extending proximal of the proximal waist to a proximalmost extent of the occlusion balloon. The catheter further includes a fluid discharge port located distal of the occlusion balloon for discharging a lubricious fluid exterior of the elongate shaft toward the stent to facilitate advancing the stent across an occlusion.

主权项

1. A stent delivery catheter for positioning a stent across a lesion of a blood vessel, the stent delivery catheter comprising:
an elongate shaft having a proximal end, a proximal region proximate the proximal end, a distal end, and a distal region proximate the distal end; an inflation balloon including a proximal waist, a distal waist and a central region between the proximal waist and the distal waist, the inflation balloon secured to the distal region of the elongate shaft; a stent having a proximal end, a distal end and a length from the proximal end to the distal end, the stent disposed around the central region of the inflation balloon; and an occlusion balloon secured to the elongate shaft proximal of the inflation balloon, the occlusion balloon having a proximal waist secured to the elongate shaft and a distal waist secured to the elongate shaft, the occlusion balloon including a first folded-over portion extending distal of the distal waist to a distalmost extent of the occlusion balloon and a second folded-over portion extending proximal of the proximal waist to a proximalmost extent of the occlusion balloon, the occlusion balloon being inflatable from a pre-inflated state to an inflated state; wherein when the occlusion balloon is in the pre-inflated state the first folded-over portion has a length measured from the distal waist of the occlusion balloon to the distalmost extent of the occlusion balloon and the second folded-over portion has a length measured from the proximal waist of the occlusion balloon to the proximalmost extent of the occlusion balloon, wherein the length measured from the distal waist of the occlusion balloon to the distalmost extent of the occlusion balloon is greater than the length measured from the proximal waist of the occlusion balloon to the proximalmost extent of the occlusion balloon; wherein the sum of the lengths of the first folded-over portion and the second folded-over portion is greater than the length of the stent; wherein the occlusion balloon is configured to roll onto itself in the inflated state as the inflation balloon and stent are advanced across the lesion; and wherein the distalmost extent of the occlusion balloon is proximal of the stent in the pre-inflated state.