Needle shield assembly having a single-use lock

A needle shield assembly having a single-use lock comprising:

• a needle cannula having a proximal end, a distal end and a lumen therethrough defining a longitudinal axis, said distal end of said needle cannula including a sharp tip;
• a hub having a proximal end for connecting to a fluid transfer device and a distal end connected to said proximal end of said needle cannula;
• a collar rotationally connected to said hub so that said collar can be rotated around said hub;
• an elongate rigid needle cover releasably engaging said hub and covering said needle cannula;
• an elongate needle shield having a distal end and a proximal end hingedly connected to said collar, said needle shield including two side walls defining a longitudinal opening and a back wall between said sidewalls opposite said longitudinal opening, said needle shield capable of pivoting from an open position wherein said needle cannula is exposed, to a closed needle protecting position wherein said needle cannula is within said longitudinal opening of said needle shield;
• at least a portion of said longitudinal opening being smaller than said needle cover so that said needle cover must be removed before said needle shield can be pivoted to said closed position;
• said needle shield including two parallel opposed locking arms at its proximal end and a locking aperture in each locking arm, said collar including two opposed locking pins, said locking arms being positioned so that when said needle shield is pivoted to said closed needle protecting position, said locking arms are deflected outwardly until said locking pins engage said locking apertures to permanently lock said needle shield in said closed position.