A stent delivery system, comprising: (a) a stent, the stent defining an interior volume and having a distal open end, a proximal open end, and expandable structure defining a side branch aperture, the expandable structure being configured to move into a radial outward orientation; (b) a first catheter branch including: i. a distal end portion and a proximal end portion; and ii. a first balloon positioned on the first catheter branch, the first balloon having a distal end portion and a proximal end portion, the proximal end portion of the first balloon being positioned within the interior volume of the stent and the distal end portion of the first balloon being positioned distal of the distal open end of the stent; and (c) a second catheter branch including: i. a distal end portion and a proximal end portion; and ii. a second balloon positioned on the second catheter branch, the second balloon including a distal end portion, a proximal end portion, and an inflatable portion, the second balloon being movable between: a retracted orientation wherein the inflatable portion 59) is positioned proximal of the side branch aperture of the stent and the distal end portion of the second catheter branch extends through the side branch aperture; and an advanced orientation wherein the second balloon is advanced at least partially distally through the side branch aperture. (a) a stent, the stent defining an interior volume and having a distal open end, a proximal open end, and expandable structure defining a side branch aperture, the expandable structure being configured to move into a radial outward orientation; (b) a first catheter branch including: i. a distal end portion and a proximal end portion; and ii. a first balloon positioned on the first catheter branch, the first balloon having a distal end portion and a proximal end portion, the proximal end portion of the first balloon being positioned within the interior volume of the stent and the distal end portion of the first balloon being positioned distal of the distal open end of the stent; and i. a distal end portion and a proximal end portion; and ii. a first balloon positioned on the first catheter branch, the first balloon having a distal end portion and a proximal end portion, the proximal end portion of the first balloon being positioned within the interior volume of the stent and the distal end portion of the first balloon being positioned distal of the distal open end of the stent; and (c) a second catheter branch including: i. a distal end portion and a proximal end portion; and ii. a second balloon positioned on the second catheter branch, the second balloon including a distal end portion, a proximal end portion, and an inflatable portion, the second balloon being movable between: a retracted orientation wherein the inflatable portion 59) is positioned proximal of the side branch aperture of the stent and the distal end portion of the second catheter branch extends through the side branch aperture; and an advanced orientation wherein the second balloon is advanced at least partially distally through the side branch aperture. i. a distal end portion and a proximal end portion; and ii. a second balloon positioned on the second catheter branch, the second balloon including a distal end portion, a proximal end portion, and an inflatable portion, the second balloon being movable between: a retracted orientation wherein the inflatable portion 59) is positioned proximal of the side branch aperture of the stent and the distal end portion of the second catheter branch extends through the side branch aperture; and an advanced orientation wherein the second balloon is advanced at least partially distally through the side branch aperture. a retracted orientation wherein the inflatable portion 59) is positioned proximal of the side branch aperture of the stent and the distal end portion of the second catheter branch extends through the side branch aperture; and an advanced orientation wherein the second balloon is advanced at least partially distally through the side branch aperture.