| 摘要 |
A syringe, comprising a common barrel (6), piston (2) and serum capsule (1), has a detonator (4) that can be fitted in different positions according to the use of the syringe. The syringe, comprising a common barrel (6), piston (2) and serum capsule (1), has a detonator (4) that can be fitted in different positions according to the use of the syringe. It can be fitted behind the piston head (3) for a needle-less injection or to deploy the needle automatically, or beneath a needle supporting cylinder to retract the needle after injection. In the latter case there is a time delay to allow the needle to be withdrawn from the patient before it is retracted.
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