| 摘要 |
This invention relates to a safety needle to prevent needle stick injuries. The invention provides a safety needle accessory comprising a hollow needle having a base end and a sharp end, a hub surrounding the base end of the needle and having a connector for connection to an injection device, a sleeve surrounding the hub and slidable relative to the hub in an axial direction, an elastically deformable member, and a pack having a closed end covering the sharp end of the needle and an open end exposing the connector of the hub and which is releasably mounted over the needle, hub and sleeve. The sleeve is slidable in a first axial direction from a first position in which the needle is fully or partially covered by the sleeve to a second position in which the needle is exposed, via an intermediate position between the first and second positions in which the sharp end of the needle projects from the sleeve, and in a second axial direction from the second position to a third position in which the needle is fully covered by the sleeve. The deformable member is deformed by the sleeve sliding from the first to the second position and the force for sliding from the second to the third position is provided by the stored elastic energy in the deformable member. The closed end of the pack has a removable cap at a position on the pack such that removal of the cap exposes the sharp end of the needle but not the sleeve when the sleeve is in the intermediate position. |
