| 摘要 |
A fluid injector suitable for injecting medicaments into the human body comprises a tube (1) having a piston (3) slidable therein and a slidable sealing member (6) in one end thereof. A cap (10) is located over the one end and has a tubular needle (17) extending from it inwardly of the tube (1), the needle communicating via a fluid passage through the cap to an injector outlet (19) outside the tube. The cap and sealing member are provided with co-operating screw threads whereby rotation of the cap relative to the tube draws the sealing member along the tube and into engagement with the needle, which pierces a thin portion (8) of the sealing member, thereby establishing fluid communication between the interior of the tube and the injector outlet. |
