A combined percutaneous needle, stylet and needle guard. The guard has a friction fit with the distal end of the needle and stylet to retain the guard. When in use, the guard is transferred to the hub end of the needle to interfit with a proximal end of the needle and serve as a guide for a guidewire...http://www.google.com/patents/US4846804?utm_source=gb-gplus-sharePatent US4846804 - Combined needle protector and guidewire feeder
