| 摘要 |
<p>Hypodermic syringe, having a cylinder (1), a piston (5) in said cylinder and a piston rod (6) with means for moving the piston towards or away from the needle (3) attached at one end of the cylinder. The invention being formed by an element on the piston rod, which is slidable along the piston rod in only one direction, towards the piston, and which engages the inner wall of the cylinder such that said element can only slide along said inner wall towards the needle. In its most simple form said element is a plate placed over a rib of a piston rod with a section in the form of a across, which plate has outer points which engage the iner wall and inner points which engage said rib.</p> |
