Catheters and methods of manufacture and use

A balloon catheter, comprising:

• an outer elongate shaft having a wall thickness that is less than 0.0035 inches;
• an inner elongate shaft with a delivery lumen therein, the inner elongate shaft within the outer elongate shaft having a section that extends distally beyond the outer elongate shaft, the inner elongate shaft having a wall thickness that is less than 0.0035 inches;
• an adapter secured to a distal region of the outer elongate shaft, the adapter having a distal region extending distally beyond the outer elongate shaft, the distal region of the adapter having an outer surface disposed radially inward relative to an outer surface of a distal end of the outer elongate shaft;
• an inflatable balloon with a proximal end;
• a proximal collar radially outside of the proximal end of the balloon, the proximal collar compressing the proximal end of the balloon between the proximal collar and the outer surface of the distal region of the adapter, wherein an inner surface of the proximal end of the balloon is disposed radially inward relative to the outer surface of the distal end of the outer elongate shaft;
• the inflatable balloon having a distal end stabilized relative to the section of the inner elongate shaft that extends distally beyond the outer elongate shaft, the distal end of the inflatable balloon having an inner surface that is disposed radially inward relative to the outer surface of the distal end of the outer elongate shaft,
• the outer elongate shaft and the inner elongate shaft forming an inflation lumen that is in communication with the inflatable balloon to allow fluid to be advanced through the inflation lumen and into an internal volume of the balloon to inflate the balloon,
• wherein the inflatable balloon is disposed substantially at or below the outer diameter of the outer elongate shaft when in an unexpanded configuration.