The invention relates to a device and method for approximating two
vessels. The device includes a first catheter and a second catheter. The
second catheter is slidably disposed in the first catheter. A first
expansible member is disposed on the first catheter, and a second
expansible member is disposed on the second catheter. The medical device
also includes a locking mechanism for interlocking the first catheter and
second catheter to prevent relative movement between the first and second
catheters.