Patent ID: 8211137

Claim:
A method of delivering a medical device to a bifurcated vessel, the method comprising: providing a medical device including a catheter shaft defining a first guidewire lumen, a balloon disposed about a portion of a distal region of the catheter shaft, and a side branch tubular member defining a second guidewire lumen and coupled to a portion of the balloon, the balloon including a proximal waist and a distal waist being selectively rotatable about the distal region of the catheter shaft; advancing the medical device over a first guidewire and a second guidewire to a bifurcation in a vessel, wherein the first guidewire is received in the first guidewire lumen and the second guidewire is received in the second guidewire lumen, allowing the balloon to passively rotate about the catheter shaft; and after advancing the medical device over the first guidewire and a second guidewire, sealing the balloon to the catheter shaft; wherein the catheter shaft includes a proximal fixed body and a distal fixed body; wherein the proximal waist engages the proximal fixed body and the distal waist engages the distal fixed body when the balloon is sealed.