| 摘要 |
<p>An accessory for an injection device of the kind in which liquid is drawn or expelled along a hollow needle 9 comprises a protective sleeve 1 for surrounding the needle 9. The sleeve 1 has at least an end portion 11 which is reciprocable in the direction of the length of the needle 9 between an extended position in which the point of the needle 9 is located within the sleeve 1 to shield the point of the needle 9 and a contracted position in which the point of the needle 9 projects from the sleeve 1, to enable an injection to be effected. A retaining arrangement, making use of a pin 19 located within a hooked portion 22 of a track 20, is provided for retaining the sleeve 1 in the extended position after the injection has been effected and preventing the point of the needle 9 from being exposed solely by application of pressure to the end portion 11 of the sleeve 1 in the direction of contracting movement.</p> |
