Catheter having transitioning shaft segments

A method of forming a balloon catheter comprising:

• providing an elongate tubular shaft including an outer tubular member having a proximal portion and a distal portion, the elongate tubular shaft including an inner tubular member having a distal length extending distally from the distal portion of the outer tubular member, the elongate tubular shaft having an inflation lumen and a guidewire lumen defined therein, the guidewire lumen extending along at least the distal length of inner tubular member;
• coupling a distal end section to a distal end of the inner tubular member, the distal end section having a proximal end and a distal end;
• and
• coupling a proximal portion of a balloon to the distal portion of the outer tubular member, and coupling a distal portion of the balloon to the distal end section, the balloon having a working length between the proximal portion and the distal portion, the balloon defining an inner chamber in fluid communication with the inflation lumen;
• wherein the proximal end of the distal end section is disposed within the inner chamber.