US 11,944,790 B2
Injection device
Matthew John Dobson, Woodstock (GB); Rosie Hutt, Woodstock (GB); and Abiodun Falodi, Woodstock (GB)
Assigned to Owen Mumford Limited, Oxfordshire (GB)
Appl. No. 17/276,006
Filed by Owen Mumford Limited, Woodstock (GB)
PCT Filed Sep. 13, 2019, PCT No. PCT/EP2019/074521
§ 371(c)(1), (2) Date Mar. 12, 2021,
PCT Pub. No. WO2020/053404, PCT Pub. Date Mar. 19, 2020.
Claims priority of application No. 1814914 (GB), filed on Sep. 13, 2018.
Prior Publication US 2022/0040408 A1, Feb. 10, 2022
Int. Cl. A61M 5/20 (2006.01); A61M 5/315 (2006.01); A61M 5/32 (2006.01)
CPC A61M 5/2033 (2013.01) [A61M 5/31501 (2013.01); A61M 5/3204 (2013.01); A61M 2005/2026 (2013.01); A61M 2005/206 (2013.01); A61M 2005/2073 (2013.01); A61M 2005/208 (2013.01); A61M 2205/581 (2013.01)] 20 Claims
OG exemplary drawing
 
1. 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 first formation fixed relative to the casing and a second formation fixed relative to the insertion tube, the first and second formations defining between them a plurality of stop positions for the insertion tube relative to the casing, spaced along the direction of said longitudinal axis, to prevent significant rearward movement of the insertion tube along said axis when the plunger is released from the reaction assembly.