| 摘要 |
A needle assembly (10) includes a housing (12), a needle (14) projecting from the housing (12), a needle shield (16) displaceable relative to the needle (14) to vary the length of an unshielded portion of the needle (14) projecting from the needle shield (16) and locking means (48) for locking the needle shield (16) in a position in which the point (34) of the needle (14) is shielded by the needle shield (16). |
