Catheter balloon systems and methods

A stent delivery system comprising:

• a catheter including a proximal end portion and a distal end portion, the distal end portion defining a first branch and a second branch, each of the first and second branches defining an inflation lumen, the second branch having a proximal end and a distal end, each of the proximal and distal ends of the second branch being coupled to the first branch;
• a first inflatable portion coupled to the first branch and in fluid communication with the inflation lumen of the first branch;
• and
• a second inflatable portion coupled to the second branch and in fluid communication with the inflation lumen of the second branch, and, when inflated, the second inflatable portion being generally bulbous in shape and configured to extend radially away from the first inflatable portion, wherein a length of the second inflatable portion is less than a length of the first inflatable portion;
• wherein the proximal end of the second branch is attached to the first branch adjacent a proximal end of the first inflatable portion and the distal end of the second branch is attached to the first branch adjacent a distal end of the first inflatable portion;
• wherein only one of the first and second branches includes a guidewire lumen, where the guidewire lumen extends through the first or second branch and through the corresponding first or second inflatable portion, wherein the guidewire lumen is distinct from the inflation lumen of the corresponding inflatable portion.

A stent delivery system, comprising:

• an elongate shaft including a proximal region, a distal region, and an inflation lumen, the elongate shaft defining a first guidewire lumen;
• a first balloon disposed about the distal region of the elongate shaft, wherein the first balloon is in fluid communication with the inflation lumen of the elongate shaft;
• a second balloon disposed adjacent the first balloon, the second balloon including a balloon body portion and a first balloon leg and a second balloon leg, the first balloon leg extending proximally from the balloon body portion and the second balloon leg extending distally from the balloon body portion, the first balloon leg having a proximal end coupled directly to the elongate shaft proximal of a proximal waist of the first balloon, and the second balloon leg having a distal end coupled directly to the elongate shaft distal of a distal waist of the first balloon, wherein the second balloon is in fluid communication with the inflation lumen via the first balloon leg and/or the second balloon leg;
• wherein the first and second balloons each have a length extending along a longitudinal axis of the elongate shaft, wherein the length of the second balloon body portion is less than the length of the first balloon.