| 摘要 |
A safety pen needle assembly is provided herein which includes a tubular carrier (12) having a distal end, a proximal end and a transverse engagement wall (30) located between the proximal and distal ends. The engagement wall includes an aperture (32). A needle (16) is further provided having a distal end, for injection into a patient, and a proximal end, along with a needle hub (14). The needle is fixed to the needle hub so as to move therewith, and the needle hub is disposed in the carrier distally of the engagement wall. The assembly also includes a shield (18) for selectively covering the distal end of the needle. A first biasing element (20) is provided for urging the needle hub from a first hub position where the needle extends through the aperture of the engagement wall to a second hub position where the proximal end of the needle is located distally of the proximally-facing outer surface of the engagement wall. In addition, a second biasing element (22) is provided for urging the shield from a first shield position where the distal end of the needle is not covered by the shield to a second shield position where the distal end of the needle is covered by the shield.
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