| 摘要 |
<p>A syringe assembly comprise a barrel having an inside surface describing a chamber for retaining fluid. The barrel includes an open proximal end and a distal end with an elongated tip extending therefrom having a passageway therethrough in fluid communication with the chamber. A plunger rod includes an elongated body portion having a proximal end, a distal end and a stopper at the distal end. The stopper is slidably positioned in fluid-tight engagement within the barrel. An elongated projection extends distally outwardly from the distal end of the plunger rod. The elongated projection is shaped to fit within the passageway of elongated tip. Structure is provided to prevent the removal of a needle assembly from the elongated tip of the syringe barrel. A locking element is provided to prevent the proximal motion of the plunger rod with respect to the barrel after initial distal motion of the stopper to expel fluid from the syringe barrel.</p> |
