US 12,337,150 B2
Auto injector with bi-stable clutch plate
Christopher Belisle, Somerset, WI (US)
Assigned to Phillips-Medisize A/S, Struer (DK)
Appl. No. 17/436,775
Filed by Phillips-Medisize A/S, Struer (DK)
PCT Filed Mar. 23, 2020, PCT No. PCT/EP2020/057963
§ 371(c)(1), (2) Date Sep. 7, 2021,
PCT Pub. No. WO2020/193468, PCT Pub. Date Oct. 1, 2020.
Claims priority of application No. 19164529 (EP), filed on Mar. 22, 2019.
Prior Publication US 2022/0176042 A1, Jun. 9, 2022
Int. Cl. A61M 5/315 (2006.01); A61M 5/20 (2006.01); A61M 5/32 (2006.01); A61M 5/24 (2006.01); A61M 5/31 (2006.01)
CPC A61M 5/31543 (2013.01) [A61M 5/2033 (2013.01); A61M 5/3202 (2013.01); A61M 2005/2013 (2013.01); A61M 2005/2407 (2013.01); A61M 2005/2492 (2013.01); A61M 2005/3142 (2013.01)] 25 Claims
OG exemplary drawing
 
1. An auto injector for delivery of a medicament to a patient, the auto injector extending from a proximal end to a distal end, wherein the auto injector is adapted for receiving a cartridge assembly supporting a syringe comprising:
a syringe compartment containing the medicament;
a hollow needle through which the medicament can be delivered to a patient;
a stopper proximally movable inside the syringe compartment for evacuating the medicament in the syringe compartment; and
a syringe cap adapted for protecting the needle; and
wherein the auto injector comprises:
a housing defining a passageway formed by an inside surface of the housing and further including release ribs extending from the inside surface and into the passageway;
a plunger movably positioned in the passageway of the housing, the plunger being adapted for moving the stopper inside the syringe compartment proximally for delivery of the medicament;
a plunger spring between the housing and the plunger, and adapted for moving the plunger proximally for delivery of the medicament; and
a clutch assembly positioned in the passageway of the housing, the clutch assembly comprising a bi-stable clutch plate comprising a flexible ring part and one or more retention arms, the flexible ring part defining a radius and being movable between a first stable position during delivery of medicament and a second stable position, wherein a free end of the one or more retention arms extend radially outward from an outer perimeter of the flexible ring part and are engaged with the inside surface of the housing in the first stable position, and wherein the free end of the one or more retention arms extend radially inward from the outer perimeter of the flexible ring part and are disengaged from the inside surface of the housing in the second stable position, wherein the one or more retention arms extend at a first angle in the first stable position and the one or more retention arms extend at a second angle in the second stable position, and
wherein upon translation of the cartridge assembly into the auto injector after delivery of the medicament, the one or more retention arms are brought into contact with the release ribs and the flexible ring part is moved from the first stable position to the second stable position allowing the cartridge assembly to be removed and the auto injector to be reset.