Patent ID: 6032411
Filing Date: 2000-03-07
Classification: A01G

Abstract:
A tree syringe for injecting a liquid agent comprising:a barrel and a plunger,the barrel having a floor, a barrel wall and an injection stem, the barrel wall and the barrel floor defining the interior of the barrel, the injection stem protruding from the barrel floor away from the interior of the barrel, the injection stem having a passageway therethrough, the barrel floor having a thin membrane separating the injection stem passageway from the interior of the barrel,the plunger having a cap, a plunger wall and a drain stem, the plunger wall adapted to fit slidably and sealably inside the barrel wall, the drain stem mounted to the plunger wall and positioned to align with the thin membrane of the barrel floor, the drain stem adapted to break the thin membrane of the barrel floor when pushed therethrough, the drain stem also positioned and adapted to pass into the injection stem passageway, the drain stem also adapted to fit inside the injection stem passageway without blocking the injection stem passageway,whereby when the barrel is partially filled with the liquid agent and the plunger is inserted into the barrel with the drain stem of the plunger aligned with injection stem passageway of the barrel, and if the plunger is further inserted into the barrel, the drain stem pierces the thin membrane of the barrel floor and the liquid agent is expelled out through the injection stem.