| 摘要 |
PCT No. PCT/NL91/00144 Sec. 371 Date Apr. 19, 1993 Sec. 102(e) Date Apr. 19, 1993 PCT Filed Aug. 2, 1991 PCT Pub. No. WO92/04073 PCT Pub. Date Mar. 19, 1992An infusion or transfusion needle assembly includes a hollow needle fixed to a needle holder. The needle holder is surrounded by a sheath such that the sheath and the needle holder are axially slidable relative to one another. Releasable detent locking means are provided between the needle holder and the sheath to positively prevent axial movement of the needle holder and needle relative to the sheath, thereby locking the needle in an extended position for insertion into the skin of a patient. Unlocking means are provided for releasing the releasable detent locking means, thereby permitting axial movement of the needle holder and needle relative to the sheath so that the needle is movable from the extended position to a fully retracted position within the sheath. Once the needle is fully retracted, permanent detent locking means become operative to positively and permanently maintain the needle in the retracted position. |
