Patent ID: 7041125

Claim:
An intravascular balloon catheter, comprising: a) an elongated shaft having an outer tubular member defining an inflation lumen, and an inner tubular member defining a guidewire lumen, the inner tubular member comprising a polymeric tube with at least a section having an outer coiled support member wound in a first direction and embedded in the polymeric tube, and an inner coiled support member wound in a second direction opposite to the first direction and having coils spaced apart and spaced closer together than coils of the outer coiled support member, and the inner coiled support member has an inner surface with a lubricious coating thereon which is a discontinuous lubricious layer, and the outer coiled support member has a pitch which is not greater than about 40 to about 60 degrees with respect to a longitudinal axis of the tube to provide a desired flexibility, and the difference in pitch between the inner and outer coiled support member coils is about 10 to about 45 degrees to provide a desired tensile strength and stiffness; and b) an inflatable balloon on a distal shaft section having an interior in fluid communication with the inflation lumen.