Antireflux cannula assembly system to prevent fluid egress and catheter with a safety device to prevent accidental needlesticks.

Cannula assembly antireflux system to prevent fluid egress and catheter safety device to prevent accidental needle sticks. The invention consists of a cannula radiopaque to channel blood vessels or body cavities with a catheter that guides. The safety device, which prevents accidental puncture, consists of a hollow metal cylinder which protects the sharp bevel end of the catheter when the stent and catheter are disengaged during performance of the technique. It also incorporates an anti-reflux valvular system housed therein, which prevents exit of body fluids outside during the maneuvers of connection cannula devices necessary for the administration of substances or sampling of biological products. The whole is protected by a sheath to the time of use.