Patent AU-2022211791-A1 (AU)
Title: Automatic injector
Inventor: HURLSTONE CHRISTOPHER JOHN
IPC: A61M5/00
Filed: 2022-08-01
Abstract: An automatic injector (100) comprising a housing; having a retention step formed on 
an inner surface of the housing; a cartridge having an opening therein and containing a 
medicament, the medicament rearwardly confined by a plunger received through the opening, 
the cartridge (160) including a needle assembly operative to dispense the medicament there 
through during a medicament dispensing operation, the needle assembly including a needle; a 
cartridge container (140) disposed within the housing and operative to receive the cartridge 
therein, the cartridge container having a ledge that abuts the retention step of the housing to 
limit movement of the cartridge container within the housing, the cartridge container having a 
closed front end except for an opening therein sized to receive the needle there through during 
the medicament dispensing operation, the closed front end operative to engage the cartridge 
and oppose continued movement of the cartridge after the needle passes through the front end 
opening; an actuation assembly (130) providing a stored energy source capable of driving the 
plunger within the cartridge to dispense the medicament through the needle assembly, the 
actuation assembly secured to the housing; and a needle cover (150) at least partially received 
within the housing and operative to receive therein at least the front end of the cartridge 
container, the needle cover extending beyond the housing and having an end surface operative 
to contact an injection site prior to a medicament dispensing operation, the end surface having 
an opening sized to receive the needle there through during a medicament dispensing 
operation; wherein: residual force from the energy source after activation of the automatic 
dispensing operation is contained within the cartridge container, the cartridge, the housing, and 
the actuation assembly to prevent kickback of the automatic injector from the injection site 
during a medicament dispensing operation.
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