Patent ID: 7670364

Claim:
A stent delivery system for delivery and deployment of a stent within a vessel, comprising: a catheter, the catheter comprising a proximal portion, a distal portion and an inner shaft, the inner shaft having a distal portion; a first balloon mounted about the inner shaft, the first balloon having a collapsed state, an expanded state, a distal portion terminating at a distal end, a proximal portion terminating at a proximal end and a central portion positioned between the distal portion and the proximal portion, the central, distal and proximal portions defining a fluid chamber, wherein the fluid chamber is common to the central, distal and proximal portions, and each having an inner diameter when the first balloon is in the expanded state, wherein, when the first balloon is in the expanded state, the inner diameter of the central portion is less than the inner diameter of either the distal portion or the proximal portion; a second balloon mounted on the catheter, the second balloon being positioned about the first balloon, such that the entirety of the first balloon is within the second balloon, and having a collapsed state and an expanded state, the second balloon being between the first balloon and the stent and independently expandable relative to the first balloon, wherein the second balloon is not permeable by liquid; and a stent mounted on the catheter and positioned about the first balloon.