Patent ID: 8632503

Claim:
A safety pen needle assembly comprising: a hub; a needle fixed to said hub, said needle having a distal end, formed for insertion into a patient, and a proximal end; a first shield having a tubular body at least partially encircling a portion of said needle; a second shield having a tubular body at least partially encircling a portion of said needle; a first biasing means disposed to urge said second shield proximally towards said proximal end of said needle; and, releasable retaining means for releasably retaining said second shield in an initial position against the force of said first biasing means, wherein, a predetermined extent of distal movement of said first shield towards said distal end of said needle causes said retaining means to release said second shield, and, wherein, with said second shield being released, said second shield is urged proximally by said first biasing means to a second position where said second shield covers said proximal end of said needle.