Patent ID: 8911399
Filing Date: 2014-12-16
Classification: A61M

Abstract:
1. A balloon catheter comprising: a catheter shaft extending along a longitudinal axis; a first balloon mounted on the catheter shaft, the first balloon having a first portion attached to the catheter shaft, a second portion disposed distal of the first portion and attached to the catheter shaft, and a middle working region disposed from the first portion to the second portion, the first portion having an increasingly larger cross-sectional area along the longitudinal axis in a distal direction, the second portion having an increasingly smaller cross-sectional area along the longitudinal axis in the distal direction, the first portion and the second portion joined to one another by the middle working region; and a second balloon mounted around at least a portion of the first balloon, the second balloon having a middle working length, and a plurality of holes formed in the middle working length to define a perforated portion of the middle working length, the plurality of holes consisting of all of the holes through the second balloon, each of the first and second balloons movable to an expanded configuration to define an annular space therebetween, the annular space being in communication with the plurality of holes of the second balloon, the annular space being disposed between the perforated portion of the middle working length of the second balloon and a corresponding portion of the middle working region of the first balloon, the annular space being defined by a length extending between a first end disposed at a most proximal hole of the plurality of holes of the second balloon and a second end disposed at a most distal hole of the plurality of holes of the second balloon, wherein said annular space has an increasingly smaller cross-sectional area along the longitudinal axis in the distal direction along the length from the first end to the second end of the annular space.