| 摘要 |
A syringe as disclosed having an elongated cylindrical tube open at both a first and second end. The first open end of the tube provides both a filling and dispensing opening for the contents of the tube. A cylindrical piston is slidably mounted within the tube and has a first axial end facing the fill and dispensing opening and a second axial end facing the opposite or second opening. The piston has an outside diameter slightly smaller than the inside diameter of the tube so that an annular clearance space is formed between the tube and the piston. A wiper extends radially outwardly from the second end of the piston and frictionally engages the cylindrical internal surface of the tube. In practice, when the syringe is filled, air is compressed through the annular opening and deflects the wiper such that the air escapes out of the syringe tube. The fill material, however, is sufficiently viscous such that, after air has been expelled from the tube, the viscous material slidably displaces the piston within the interior of the tube. A novel tamper evident cap is also disclosed for closing the second end of the tube. |
