The invention relates to a catheter device and guidewire system to enable the catheter to be exchanged over a conventional length guidewire without the use of a guidewire extension or exchange wire. The catheter device includes an elongated inflation shaft having a longitudinal inflation lumen, an extension...http://www.google.com.au/patents/US6200305?utm_source=gb-gplus-sharePatent US6200305 - Catheter having a variable length shaft segment and method of use
