Patent ID: 7037291

Claim:
A balloon catheter, comprising: a) an elongated shaft having an inflation lumen, and a guidewire receiving lumen, and i) a proximal shaft section comprising a proximal tubular member having a proximal end, a distal end, and a distal portion, and defining a proximal portion of the inflation lumen; ii) a distal shaft section comprising an outer tubular member having a proximal end and a distal end, and defining a distal portion of the inflation lumen, and an inner tubular member having a proximal end, a distal end, and a proximal portion in a side-by-side relationship with the distal portion of the proximal tubular member, the inner tubular member extending within the distal portion of the inflation lumen and beyond the distal end of the outer tubular member and defining the guidewire lumen in communication with a guidewire distal port at a distal end of the catheter shaft and a guidewire proximal port at the proximal end of the inner tubular member; and iii) a polymeric tubular reinforcing member on an inner surface of the distal portion of the proximal tubular member, having a proximal end, a distal end, and a length, and being formed of a first polymeric material having a glass transition temperature greater than a glass transition temperature of a second polymeric material forming the distal portion of the proximal tubular member; and b) a support mandrel extending within the proximal tubular member, adjacent to and bonded to an outer surface of the polymeric reinforcing member; and c) a balloon on the distal shaft section, having an interior in fluid communication with the inflation lumen.