Patent ID: 6960187

Claim:
A catheter comprising: an outer elongate tubular member having a proximal end and a distal end, wherein the outer elongate member has a first stiffness at a first location and a second stiffness less than the first stiffness at a second location, the second location being distal of the first location; an inner elongate tubular member having a proximal end and a distal end, the inner elongate tubular member having an inner surface defining a first lumen and having an outer surface, wherein at least part of the inner surface has a first coefficient of friction, and at least part of the outer surface has a second coefficient of friction that is greater than the first coefficient of friction; and a balloon; wherein the inner elongate tubular member is disposed coaxially within at least a portion of the outer elongate tubular member to define a second lumen therebetween, and wherein the balloon is attached to the distal end of the outer elongate tubular member and the distal end of the inner elongate tubular member.