| 摘要 |
A retractable syringe needle, including a needle assembly featuring a needle-holding mechanism containing a hub and a means for securing a syringe barrel to the hub, a hypodermic needle extending through the hub; and a pin connected with said hub. The needle assembly is positioned inside a tubular container which has a tubular wall with a first longitudinal slot therein. The container has a first end adapted to receive a syringe barrel, and a second open end adapted to receive a syringe needle. The needle assembly is slidably mounted in the container so that the first longitudinal slot slidably engages the pin. The needle assembly may be moved from a first position where the needle is within the container to a second position where the needle is exposed by sliding the pin toward the second open end of the container and causing the needle to pass through the second open end. The retractable syringe needle additionally features a means for biasing the needle assembly toward said first position; and a means for releasably engaging the pin at a defined location in said first longitudinal slot so as to hold said needle assembly in the position which exposes the needle. Similar retractable needles for use in administration of intravenous fluids or collection of blood samples are also disclosed.
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