| 摘要 |
<p>Syringe has a barrel holding a piston on a plunger rod which has a resilient blocking member contacting the barrel inside surface to engage the sharp edge of a recess in the surface extending from the edge towards the needle end of the barrel. Engagement of the member with the edge prevents further retraction of the rod towards the barrel rear end. The rod is pref. slidably connected with the piston to allow limited relative movement. There is pref. at least one removable safety element which prevents the plunger assembly from being forced before use into a position with the member engaged with the recess edge.</p> |
