A balloon catheter for use in angioplasty that includes a main shaft which is a flexible thin walled metal tube and a hollow, flexible torque transmitting shaft mounted at the distal end of the main shaft. A core member is connected to the torque transmitting shaft, and an inflatable balloon is mounted...http://www.google.com/patents/US4838268?utm_source=gb-gplus-sharePatent US4838268 - Non-over-the wire balloon catheter
