| 摘要 |
Injection syringe has a body (12) in the form of an elongated tubular barrel with an end wall and a needle, and a piston which slides inside it. The end of the syringe barrel incorporates a moving needle guard (36) which is actuated by the movement of the piston to cover the needle as it is withdrawn from the patient's skin. The needle guard moves in a socket in the end of the syringe barrel and has its inner end in the form of a thrust surface which interacts with the piston, which is in two sections (62, 58) with the space between them containing the injected fluid. The guard is made in the shape of a ring with three inward extensions with ends which clip into place in the barrel. |
