Bifurcation stent delivery system and methods

摘要

A catheter assembly may include a main balloon arranged to reside within the main vessel, and a branch balloon configured to extend from the main vessel into the branch vessel. A stent may be situated around the main balloon and may include a branch aperture at a location between proximal and distal open ends of the stent. The branch balloon may extend from within the stent, through the branch aperture, and into the branch vessel. The branch balloon, when inflated, may extend into the branch vessel. The main balloon, when inflated, may also expand the stent within the main vessel. In some arrangements, the branch balloon, when inflated, can function as an anchor within the branch vessel that resists radial and axial movement of the stent relative to the branch vessel and main vessel during expansion of the stent by the main balloon.

主权项

1. A catheter assembly adapted for treatment of a vessel bifurcation, comprising:
a main catheter shaft having a proximal end portion and a distal end portion; a main balloon positioned at the distal end portion of the main catheter shaft, the main balloon extending within a main vessel of the vessel bifurcation; a branch balloon when inflated extending radially outward at a branch angle relative to the main balloon, the branch balloon having a length sufficient to extend into a branch vessel of the vessel bifurcation when the main balloon is in a deflated state and the branch balloon is in an inflated state, wherein the branch balloon has at least three distinct sections along a length of the branch balloon, including a base section adjacent the main balloon, and first and second sections extending away from the main balloon, the base, first, and second sections each having a length, wherein the combined lengths of the base, first, and second sections is equal to a length of the branch balloon, the base, first, and second sections having different maximum width dimensions, wherein the maximum width dimension of the base section is greater than the maximum width dimension of the first and second sections; a main guidewire housing defining a main guidewire lumen that extends through the main balloon; and a branch guidewire housing that defines a branch guidewire lumen, wherein the branch guidewire housing extends through branch balloon.