| 摘要 |
A needle assembly (10) comprising a needle (16) of elliptical cross section which extends through a cylindrical housing. A movable member (26) through which the needle (16) passes slidably locates within the housing and comprises a cylindrical tube (38) extending from the housing, with an elliptical opening (42) at the free end thereof. The needle (16) can only extend from the member (26) through the opening (42) when the housing member (26) is rotated into elliptical alignment with the needle and slid into the housing. |
