| 摘要 |
The technical field of the invention is that of needleless pre-filled disposable syringes, operating with a gas generator, and used for intradermal, subcutaneous and intramuscular injections, of a liquid active principle for therapeutic use in human and veterinary medicine. The inventive needleless syringes use a reservoir ( 5 ) consisting of a tube ( 6 ) closed by an upstream plug-piston ( 7 ) and a downstream plug-piston ( 8 ) between which is contained the liquid active principle. Said needleless syringes are characterized in that they are capable of injecting a variable amount of liquid active principle ( 9 ) by adapting, through displacement of the downstream plug-piston ( 8 ) in the tube ( 6 ) the volume included between the two plug-pistons ( 7,8 ) to the amount of active principle ( 9 ) to be injected.
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