The present invention relates generally to a catheter having a torque transmitting shaft which retains adequate flexibility. The catheter includes an elongate shaft having an outer surface. In a preferred embodiment, a raised pattern is disposed on the outer surface. Preferably, the raised pattern improves...http://www.google.ca/patents/US7488338?utm_source=gb-gplus-sharePatent US7488338 - Catheter having an improved torque transmitting shaft
