US 11,992,661 B2
Injection device fill volume management
Daniel Garson, Woodstock (GB); Andreas Artelsmair, Woodstock (GB); Matthew John Dobson, Woodstock (GB); Andrew Hung, Woodstock (GB); Abiodun Falodi, Woodstock (GB); Robert Dutton, Woodstock (GB); and Marco Caglio, Woodstock (GB)
Assigned to Owen Mumford Limited, Oxfordshire (GB)
Filed by Owen Mumford Limited, Woodstock (GB)
Filed on Jun. 15, 2022, as Appl. No. 17/840,740.
Application 17/840,740 is a continuation of application No. 16/585,322, filed on Sep. 27, 2019, granted, now 11,383,040.
Claims priority of application No. 1815826 (GB), filed on Sep. 28, 2018.
Prior Publication US 2022/0313920 A1, Oct. 6, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. A61M 5/315 (2006.01); A61M 5/20 (2006.01); A61M 5/32 (2006.01)
CPC A61M 5/31515 (2013.01) [A61M 5/2033 (2013.01); A61M 5/31585 (2013.01); A61M 5/3202 (2013.01); A61M 2005/2026 (2013.01); A61M 2005/2073 (2013.01); A61M 2207/00 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An assembly for a firing mechanism for use in an injection device and comprising:
a rear cap having an elongate member extending axially forwards when installed within the injection device;
a plunger carrier releasably connected to the elongate member and fixed in position relative to the elongate member before release from the elongate member;
a plunger releasably connected to the elongate member via the plunger carrier and, upon release of the connection between the plunger carrier and the elongate member, axially displaceable in a forward direction; and
a plunger driver to drive the plunger axially forwards upon release of the connection between the plunger carrier and the elongate member, the plunger driver positioned between the rear cap and the plunger and received within the plunger such that a first end of the plunger driver abuts a forward end of the plunger,
wherein the plunger and the rear cap define an axial length of the assembly, which in turn determines a start position of a forward end of the plunger before release of the connection to the elongate member,
wherein one or both of the plunger and the plunger carrier comprises a plurality of connection features for connection between the plunger and the plunger carrier during construction of the assembly, the plurality of connection features defining a plurality of different positions at which the plunger is releasably connectable to the plunger carrier, each of the plurality of different positions defining a different start position of the forward end of the plunger,
and wherein, during construction of the assembly, the plunger is releasably connectable to the plunger carrier at one of the plurality of positions defined by the plurality of connection features for controlling the axial length of the assembly and for defining the start position of the forward end of the plunger.