US 12,427,263 B2
Drug injection control device having structure in which rod lock screw-coupled to piston rod can make linear motion under restricted rotation within rod holder
Hee Min Cho, Jeollabuk-do (KR); Jong Deok Yun, Jeollabuk-do (KR); Jae Cheon Kim, Jeollabuk-do (KR); Ki Yoon Kang, Jeollabuk-do (KR); Hyeong Chan Son, Jeollabuk-do (KR); and Seon Hye Yoon, Jeollabuk-do (KR)
Assigned to POONGLIM PHARMATECH INC., Jeollabuk-Do (KR)
Appl. No. 17/795,624
Filed by POONGLIM PHARMATECH INC., Jeollabuk-do (KR)
PCT Filed Nov. 2, 2021, PCT No. PCT/KR2021/015680
§ 371(c)(1), (2) Date Jul. 27, 2022,
PCT Pub. No. WO2022/098045, PCT Pub. Date May 12, 2022.
Claims priority of application No. 10-2020-0145236 (KR), filed on Nov. 3, 2020.
Prior Publication US 2023/0057245 A1, Feb. 23, 2023
Int. Cl. A61M 5/315 (2006.01); A61M 5/24 (2006.01)
CPC A61M 5/31528 (2013.01) [A61M 5/24 (2013.01); A61M 5/31515 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A drug injection control device comprising:
a housing being hollow;
a dose dial rotatably coupled to a side of the housing;
a cartridge holder fixedly coupled to an opposite side of the housing wherein a cartridge containing a drug is configured to be received in the cartridge holder and an injection needle is configured to be coupled to a side to deliver the drug;
an injection button positioned on an outer side of the dose dial;
a cap separably coupled to an outside of the cartridge holder;
an injection amount setting module to set an amount of the drug to be injected by storing a twisting moment in a torsion spring positioned in the housing; and
a drug delivery module to deliver the drug from the cartridge embedded in the cartridge holder by moving through the release of the twisting moment applied to the torsion spring,
wherein the drug delivery module includes:
a rod guide switchably coupled to the injection amount setting module by the operation of the injection button,
a piston rod screw-coupled to an outer side of the rod guide to deliver the drug from the cartridge embedded in the cartridge holder by making a linear motion with a rotational motion of the rod guide,
a rod holder coupled to a side of the cartridge holder along an axial direction, and through which the piston rod is coupled along the axial direction, and
a rod lock screw-coupled to an outer surface of the piston rod in the rod holder, and
wherein when the injection button operates,
the rod lock is allowed to only make a linear motion by a sliding motion of the lock protrusion through a lock guide formed through the rod holder along a lengthwise direction on an outer circumferential surface with the rotation of the rod guide and the sub-linear motion of the piston rod, and
the rod lock can only make a linear motion under restricted rotation within the rod holder.