An auto-injector comprising: a housing for receiving a syringe having a barrel containing a medicament, a plunger and a needle; a plunger driver configured to act on the syringe plunger to move the syringe plunger through the housing during a needle insertion phase and an injection phase; a safety shroud; and a plunger driver latch coupled to said safety shroud and moveable between first and second positions and configured to: while in the first position before the needle insertion phase, latch the plunger driver at a pre-insertion position in the housing, move to the second position as a result of pressure applied to the safety shroud, to unlatch the plunger driver from the pre-insertion position and allow forward movement of the plunger driver to a post-insertion and injection position in the housing and latch the plunger driver at the post-insertion and injection position, and return to the first position upon removal or reduction of pressure on the safety shroud, to unlatch the plunger driver from the post-insertion and injection position and allow forward movement of the plunger driver to deploy the safety shroud.
AUTO-INJECTOR PLUNGER DRIVER LATCH
2021-04-14
Patent
Electronic Resource
English