Safety puncturing system

A safety puncturing system, adapted to perform a Seldinger technique, for preventing needle stick injury to a user comprising a cannula and a flexible guidewire, wherein the cannula has a distal end having a bevel, a proximal end and a lumen for receiving the guidewire, wherein the guidewire has a proximal section having a proximal end and a distal end and a distal section, wherein the proximal section is releasably connected to the distal section and wherein the proximal end of the proximal section has an expanded region;

• wherein the proximal end of the cannula has a syringe cone and an undercut and wherein the expanded region has a projection or a collar which is adapted to permanently lock with the undercut at the proximal end of the cannula;
• and
• wherein the distal end of the proximal section of the guidewire extends distally beyond the distal end of the cannula when the proximal end of the cannula and the expanded region of the guidewire are permanently locked, and wherein the bevel of the cannula is automatically protected by expansion of the projection or collar at the distal end of the proximal section of the guidewire to prevent needle stick injury of a user on removal of the cannula and proximal section of the guidewire to a point that the distal end of the proximal section of the guidewire projects distally beyond the distal end of the cannula.