Patent ID: 7985235

Claim:
A balloon catheter adapted to be utilized with a guidewire, the catheter comprising: an elongated catheter shaft having a shaft proximal portion, a shaft distal portion, and a shaft transition portion disposed therebetween, wherein the catheter shaft transitions from a coaxial configuration to a non-coaxial multilumen configuration in the transition portion, each of the proximal, distal and transition shaft portions having a proximal end and a distal end; a balloon having a proximal end and a distal end, the proximal end of the balloon being attached to the distal end of the shaft distal portion; the catheter shaft including a guidewire tubular member having a bore and extending from the proximal end of the shaft proximal portion to the distal end of the balloon; an outer tubular member having a bore and extending from the proximal end of the shaft proximal portion to the shaft transition portion, the guidewire tubular member being coaxially disposed within the bore of the outer tubular member along the length of the outer tubular member; at least one distal tubular member, each distal tubular member having a bore and extending from the shaft transition portion to the proximal end of the balloon, the guidewire tubular member being disposed in a multi-lumen arrangement alongside the distal tubular members along the length of the distal tubular members; the space between the exterior of the guidewire tubular member and the interior of the outer tubular member defining a proximal inflation/deflation lumen extending between the proximal end of the shaft proximal portion and the shaft transition portion; and the bore of the distal tubular member defining a distal inflation/deflation lumen extending between the shaft transition portion and the interior of the balloon.