Patent ID: 8840590

Claim:
A safety pen needle assembly comprising: a tubular carrier having a distal end, a proximal end and a transverse engagement wall located between said proximal and distal ends, said engagement wall having a proximally-facing outer surface and an aperture formed through said engagement wall; a needle having a distal end, for injection into a patient, and a proximal end; a needle hub, said needle being fixed to said needle hub so as to move therewith, said needle hub being disposed in said carrier distally of said engagement wall; a shield for selectively covering said distal end of said needle; a first biasing means for urging said needle hub from a first hub position where said needle extends through said aperture of said engagement wall to a second hub position where said proximal end of said needle is located distally of said proximally-facing outer surface of said engagement wall; a second biasing means for urging said shield from a first shield position where said distal end of said needle is not covered by said shield to a second shield position where said distal end of said needle is covered by said shield; and, a locking means for releasably retaining said shield in said first shield position, wherein upon a release of said locking means, said second biasing means urges said shield from said first shield position to said second shield position.