| 摘要 |
A disposable needle head assembly (10) including a needle portion (20) having a protruding hypodermic needle (29) and a hub portion (22) adapted to be secured to a standard syringe body (100), and a cover portion (30), the cover portion (30) being slidingly disposed over the needle portion (20) and including an internally extending nub which travels along a recessed track formed in an exterior of the hub of the needle portion (20), thereby guiding the axial movement of the cover portion (30) about the needle portion (20) and causing the cover portion (30) to be accordingly positioned in a needle exposing position during use, and an extended needle, containing position in to which the cover portion (30) is engaged automatically after use of the hypodermic needle (29).
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