| 摘要 |
A safety mechanism for a hypodermic needle comprises a base adapted to be fixed with respect to the needle and a tubular sheath mounted for relative longitudinal movement with respect to the base between a first position for covering the needle and a second position wherein the needle can at least partially protrude from the outer end of the sheath. A latch mechanism cooperative between the base and the sheath is selectively repeatedly shiftable between a latching mode wherein the sheath is latched in its first position, and a free mode wherein the sheath is reciprocable between its first and second positions, the latch including detents for releasably retaining the latch in its free mode. |
