Patent ID: 8382935

Claim:
A method of making a balloon catheter, comprising: a) providing a distal outer tubular member having a sidewall; b) forming an opening in said distal outer tubular member by piercing said sidewall; c) placing an inner tubular member in the outer tubular member and extending a proximal portion of the inner tubular member through said opening in the outer tubular member and along an outer surface of a portion of the outer tubular member proximal to the opening; d) positioning a polymeric filler material tube at least partially around an outer surface of at least the proximal portion of the inner tubular member; e) placing a crescent shaped mandrel in the outer tubular member to form a crescent-shaped portion of the outer tubular member lumen along-side the proximal portion of the inner tubular member; f) applying heat and radially inward force to bond the proximal portion of the inner tubular member to the outer surface of the portion of the outer tubular proximal to the sidewall opening; g) bonding the distal end of a proximal tubular member to the proximal end of the outer tubular member; and h) bonding a balloon to a distal end of the outer tubular member and to a distal end of the inner tubular member, so that the balloon has an interior in fluid communication with a lumen of the outer tubular member and a lumen of the proximal tubular member.