Patent ID: 8764727

Claim:
A medical balloon catheter comprising: a shaft having a proximal end and a distal end and including a cross-wound coil tube and a sleeve surrounding the cross-wound coil tube, the cross-wound coil tube including an inner coil disposed within an outer coil, the inner and outer coils being wound in opposite pitch directions, the inner and outer coils extending from the proximal end in an overlapping arrangement defining a proximal portion of the shaft, the inner coil extending distally beyond a distal end of the outer coil and defining a distal portion of the shaft, the proximal portion having a greater stiffness than the distal portion, wherein the inner coil extends beyond a distal end of the outer coil by a length that is between at least about 2 cm and a length equal to about an entire length of the outer coil, where the entire length of the outer coil is defined by a proximal end and the distal end of the outer coil, the shaft including an inflation lumen extending between the proximal and distal ends of the shaft and longitudinally through an interior of the inner coil; and a balloon having a proximal end and a distal end and a balloon wall interconnecting the proximal and distal ends, the proximal end fixed to the distal end of the shaft, the balloon wall defining a chamber in fluid communication with the inflation lumen, wherein a wire guide lumen extends through the distal portion of the shaft and the balloon chamber; and wherein the wire guide lumen comprises a tubular member extending from within the distal portion of the shaft and through the balloon chamber, the tubular member having a proximal tubular member end and a distal tubular member end, wherein the proximal tubular member end terminates at a proximal port just distal of the distal end of the outer coil and the distal tubular member end terminates near the distal end of the balloon.