Patent ID: 11944790
Assignee: OWEN MUMFORD LIMITED
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 12:
13. An injection device for delivering a fluid from a syringe having a needle, the device comprising:
a casing;
a syringe carrier located within a proximal end of the casing for receiving a syringe and being movable along a longitudinal axis of the device between a stowed position and a needle insertion position:
a drive assembly located within a distal end of the casing and being movable along said longitudinal axis by an insertion driver in order to move said syringe carrier and the syringe from said stowed position to said needle insertion position, the drive assembly comprising
an insertion tube having a proximal end abutting said syringe carrier or the syringe,
a firing cartridge comprising a plunger, a reaction assembly releasably coupled to the plunger, and a delivery driver coupled between the plunger and the reaction assembly, wherein the firing cartridge is configured to move forward with the insertion tube until the syringe carrier reaches said needle insertion position and then to continue moving in a proximal direction through the insertion tube until said plunger contacts or approaches a bung within the syringe, whereupon said plunger is released from the reaction assembly and the reaction assembly is pushed rearwards to latch onto the insertion tube and thereby provide a reaction surface against which the delivery driver can act in order to push the plunger forwards,

the device further comprising a clip located within a proximal end of the insertion tube and being in a partially compressed state, the plunger being configured to push the clip out of an end of the insertion tube at or close to an end of travel of the plunger, thereby allowing the clip to expand against an inner surface of the casing or a component couple to the casing to produce an audible click.