| 摘要 |
<p>A safety needle device comprising a needle cannula, a hub including locking element, a compression spring and a needle guard including a tip portion opening along the injection axis for the needle cannula, wall portion and resilient locking portion, which is resilient radially and perpendicularly with respect to the injection axis, the resilient locking portion being operative to move rearwardly with respect to the locking element along a first surface of the locking element during injection, against the urging of the spring, and to move forwardly with respect to the locking element along a second surface of the locking element following injection, under the urging of the spring, into locking engagement with the locking element preventing further movement of the needle guard along the injection axis, the first and second surfaces being mutually spaced from each other along an axis extending radially and perpendicularly with respect to the injection axis.</p> |
