| 摘要 |
A hypodermic syringe provided with a container and an adapter connected to the container and on which a hypodermic needle can be placed with a piston slidable in the container and provided with a closed projecting part which in the extreme position of the piston in the container fills the adapter to leave unoccupied a small space between the inner wall of the adapter and the outer wall of the projection on the piston, the top of the projection then closing the passage of the hollow adapter to the hypodermic needle, and both the hollow space in the adapter and the projection on the piston preferably being tapered, the latter preferably at an angle smaller than the angle at which the hollow space tapers. |
