A method and system for introducing one or more devices into a biological fluid vessel. The system includes a device having a coupling structure comprising a pair of spaced-apart fingers adapted for receiving a guidewire therebetween. Preferably, the system includes a guidewire having a constricted fitting...http://www.google.com.au/patents/US5046497?utm_source=gb-gplus-sharePatent US5046497 - Structure for coupling a guidewire and a catheter
