| 摘要 |
<p>The syringe comprises a barrel A with a nozzle, a plunger F and a hollow needle C which, prior to use, lies wholly within the chamber K of the barrel. The nozzle is hermetically sealed by a fixed, resealable bung B of rubber or the like which is penetrable by the needle, the tip of which (before use) lies just behind the bung. The hilt or base end E of the needle is immovably attached to the plunger and contains a hole G through which air or fluid can pass between the needle interior and the barrel chamber. The barrel chamber may serve as an ampoule or vial in which case a protuberance P is provided on the inside of the barrel to prevent the plunger falling out. If the plunger is forced beyond this protuberance, a further protuberance R retains it. In a further embodiment, both the needle and nozzle are off-centre so that the needle may be immobilised beneath the shoulder of the barrel by rotation of the plunger (Fig.3).</p> |
