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    • 8. 发明授权
    • Self venting syringe plunger
    • 自动注射器柱塞
    • US4632672A
    • 1986-12-30
    • US785071
    • 1985-10-07
    • James R. Kvitrud
    • James R. Kvitrud
    • A61B5/15A61B5/14
    • A61B5/150236A61B5/15003A61B5/150213A61B5/150244A61B5/153A61M2005/3123
    • A syringe having a barrel adapted to receive a plunger with a through passageway from the bottom wall of a groove in which an O-ring seal is positioned to the rear surface of the plunger. Upon insertion of the plunger into the barrel, the O-ring will move to a position adjacent a rear wall defining the groove over the passageway and allow air to escape from within the barrel through the passageway. When the pressure used to seat the plunger against material within the barrel is removed, the plunger will rebound slightly causing the plunger to move relative to the O-ring so that the O-ring makes an air tight seal between the plunger and the barrel. When pressure is again applied to the plunger to press the material out of the barrel, the plunger will again move relative to the O-ring to again position the O-ring over the passageway, however, the O-ring will seal the passageway sufficiently to restrict escape of a significant amount of the viscous material through the passageway.
    • 一种注射器,其具有适于从其中O形环密封件定位在柱塞的后表面的槽的底壁接收具有通道的柱塞。 在将柱塞插入筒体中时,O形环将移动到邻近通道上限定凹槽的后壁的位置,并允许空气通过该通道从筒体内逸出。 当用于将柱塞抵靠在筒内的材料的压力被移除时,柱塞将稍微反弹,使得柱塞相对于O形环移动,使得O形环在柱塞和筒之间形成气密密封。 当压力再次施加到柱塞上以将材料挤出筒体时,柱塞将再次相对于O形环移动,以将O形环再次定位在通道上方,然而,O形环将充分密封通道 以限制大量粘性材料通过通道的逸出。