| 摘要 |
The internal surface of the cylindrical body (1) of the syringe is provided with two pairs (7 and 8) of diametrically opposite blind recesses (9 and 10) one of which (9) has a spiral configuration and the others (10) follow the generatrix. The longitudinal recess has a barrier (13), whereas the plunger (5) is provided with an elastic protrusion (17) which moves in the spiral groove (9) during the intake of the preparation and moves in the linear recess (10) during the injection. The protrusion (17) passes through the barrier (13) which prevents its return in the opposite direction, thus blocking the plunger (5) and preventing further use of the syringe. |
