| abstract |
The present invention provides an automatic injector that performs sequential control of needle control and dose injection. A syringe (900) with a needle is movable within a housing (400) between a first position where the needle is housed inside the housing and a second position where the needle (902) protrudes outside the housing Be placed. Plunger rod barrel 1100 has at least one locking member configured to lock plunger rod 1500 to the plunger rod barrel under normal conditions. The syringe driver 1200 applies a force to the syringe to move the syringe with the plunger rod barrel, the plunger rod, and the plunger rod driver from the first position to the second position. In the second position, the locking member is unlocked to release the plunger rod, thereby activating the plunger rod driver to advance the plunger rod within the syringe to deliver at least one dose of medicament. [Selected figure] Figure 1 |