US 11,052,194 B2
Injection device for delivering a defined number of equal doses of a fluid substance
Adam Stefanski, Gniezno (PL); and Alberto Lozano Platonoff, Szczecin (PL)
Assigned to COPERNICUS SP. Z O.O., Szczecin (PL)
Appl. No. 16/315,580
Filed by COPERNICUS SP. Z O.O., Szczecin (PL)
PCT Filed Jun. 30, 2017, PCT No. PCT/EP2017/066317
§ 371(c)(1), (2) Date Jan. 4, 2019,
PCT Pub. No. WO2018/007259, PCT Pub. Date Jan. 11, 2018.
Claims priority of application No. 16461534 (EP), filed on Jul. 7, 2016.
Prior Publication US 2019/0224412 A1, Jul. 25, 2019
Int. Cl. A61M 5/20 (2006.01); A61M 5/24 (2006.01); A61M 5/315 (2006.01); A61M 5/32 (2006.01); A61M 5/34 (2006.01)
CPC A61M 5/20 (2013.01) [A61M 5/24 (2013.01); A61M 5/31541 (2013.01); A61M 5/31553 (2013.01); A61M 5/31583 (2013.01); A61M 5/3202 (2013.01); A61M 5/347 (2013.01); A61M 5/3156 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An injection device for delivering a defined number of equal doses of a fluid substance contained in a reservoir, the device having a housing within an arming mechanism and a dose delivery mechanism are arranged along a longitudinal axis of the housing, the housing being coupled to an enclosure adapted for receiving the reservoir with the fluid substance wherein
the arming mechanism comprises a setting sleeve which is axially non-displaceable and rotatable around said longitudinal axis of the housing in two opposite directions by a defined setting angle, the setting sleeve being coupled to a spring having a proximal end coupled to the housing so as to be strained by the rotation of the setting sleeve during arming of the device; and
the dose delivery mechanism comprises (i) a screw ring having an internal thread, (ii) a piston rod having an external thread and at least one longitudinal groove, and (iii) an immobilized blocking sleeve having at least one blocking projection engaging with the at least one longitudinal groove to prevent rotation of the piston rod, which is axially displaceable within the setting sleeve;
the screw ring is selectively engaged with the setting sleeve by projections and an elastic arm, the projections being arranged on an internal surface of the screw ring in equal distances defined by the defined setting angle and the elastic arm being located on a distal end of the setting sleeve, the elastic arm engaging one of said projections after each rotation by the defined setting angle,
wherein during arming of the device, the screw ring and the piston rod are immobilized by a trigger mechanism located on the housing, and
during delivery of each dose, the trigger mechanism is released allowing rotation of the screw ring and displacement of the piston rod along the housing by a defined distance due to unwinding of the spring, the displacement of the piston rod causing the fluid substance to be discharged from the reservoir,
wherein the device further comprises blocking means preventing arming of the device for delivery of a subsequent dose after said defined number of doses of the fluid substance have been delivered, the blocking means comprising at least one longitudinal protrusion located near the distal end of the setting sleeve on an inside surface of the setting sleeve, and at least one longitudinal arm located at a proximal end of the piston rod, the at least one longitudinal protrusion and the at least one longitudinal arm mutually blocking each other after said defined number of doses of the fluid substance have been delivered which prevents rotation of the setting sleeve by the defined setting angle in the arming direction.