US-12623028-B2 - Drug injection control device having cartridge drug release structure through screw coupling between piston rod and rod guide

US12623028B2US 12623028 B2US12623028 B2US 12623028B2US-12623028-B2

Abstract

A drug injection control device allows a structure in which a piston rod moving with a rod guide makes a linear motion to stably inject a drug set through a dose dial. When an injection amount of drug is preset through an injection amount setting module configured to make a rotational motion with the dose dial in a housing to set the amount of drug to be injected by storing the twisting moment in a torsion spring, in actuating a drug delivery module switchably coupled to the injection amount setting module by an injection button on top of the drug injection control device, the rod guide is connected to the inside of the piston rod through a reset tube movably coupled to the injection button to allow a sub-linear motion of the piston rod.

Inventors

Hee Min Cho
Jong Deok YUN
Jae Cheon Kim
Ki Yoon Kang
Hyeong Chan SON
Seon Hye YOON

Assignees

POONGLIM PHARMATECH INC.

Dates

Publication Date: 20260512
Application Date: 20211102
Priority Date: 20201103

Claims (5)

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 of the cartridge holder 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 configured to make a rotational motion with the dose dial in the housing to set an amount of the drug to be injected by storing a twisting moment in a torsion spring; and a drug delivery module switchably coupled to the injection amount setting module by the operation of the injection button to deliver the injection amount of the drug set by the injection amount setting module from the cartridge embedded in the cartridge holder by moving through the release of the twisting moment applied to the torsion spring, wherein the injection amount setting module includes: a reset tube switchably coupled to the dose dial by the operation of the injection button, a ratchet tube coupled to an outer side of the reset tube to rotate at the same time, a scale drum which slidably rotates along an axial direction on an outer surface of the ratchet tube, and a torsion spring having two ends coupled to the housing and the ratchet tube, wherein the drug delivery module includes: a rod guide switchably coupled to the reset tube by the operation of the injection button, and 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, and wherein when the injection button operates, the rod guide coupled to the reset tube is connected to an inside of the piston rod by screw rotation coupling to allow a sub-linear motion of the piston rod through the rotation of the rod guide, thereby having a cartridge drug release structure through the screw coupling between the piston rod and the rod guide.
2 . The drug injection control device according to claim 1 , further comprising a spring base coupled to the housing, wherein the torsion spring has two ends coupled to the spring base and the ratchet tube, respectively, and wherein during the rotation through the dose dial, a side of the torsion spring fixed to the ratchet tube rotates, while an opposite side of the torsion spring fixed to the spring base is kept in fixed state, to get the spring twisted.
3 . The drug injection control device according to claim 1 , wherein the rod guide includes a guide body having a guide spiral protrusion separably coupled to a guide coupling groove formed in an inner surface of the piston rod, and a guide rotation protrusion protruding on an outer surface of one side of the guide body and separably coupled to a guide coupling groove formed on an inner surface of the reset tube.
4 . The drug injection control device according to claim 3 , wherein the rod guide is rotatably fixed without movement along the axial direction in the housing.
5 . The drug injection control device according to claim 1 , wherein the piston rod has an inner threaded surface and the rod guide has an outer threaded surface, the rod guide being disposed within the piston rod, and wherein the rod guide is selectively engageable to and disengageable from the reset tube by operation of the injection button to switch between a dose-setting state and a drug-delivery state.

Description

CROSS REFERENCE TO RELATED APPLICATIONS AND CLAIM OF PRIORITY This application claims benefit under 35 U.S.C. 119, 120, 121, or 365(c), and is a National Stage entry from International Application No. PCT/KR2021/015677, filed on Nov. 2, 2021, which claims priority to the benefit of Korean Patent Application No. 10-2020-0145235 filed in the Korean Intellectual Property Office on Nov. 3, 2020, the entire contents of which are incorporated herein by reference. BACKGROUND 1. Technical Field The present disclosure relates to a drug injection control device having a structure in which a rod guide rotates and a piston rod moving with the rod guide makes a linear motion to stably inject a drug set through a dose dial. 2. Background Art Autoinjectors are devices for easy self-administration by patients or even untrained personnel, and shield the patients from being exposed to syringe needles. There is a need for autoinjectors that are easy to use, acceptably small in size and simple to improve the manufacturing, assembly and use, resulting in reduced manufacturing and assembly costs, and have the minimized influence on the environment. Drug injectors used for subcutaneous injection require highly specialized skills and experience to use them, and recently, automatic drug injectors have been proposed, in which drugs are automatically injected via syringe needles that penetrate into the skin when pressed against the skin. Among the commercially available syringes for drug injection, pen-type syringes have functionality to feed multiple doses from drug containers, and the dose quantity is set immediately before the dose delivery. Since most of drug delivery device users have little experience, in some instances, it is desirable to provide the users with some types of indicators or information notifying that the dose delivery sequences were carried out and it is safe to remove the drug delivery devices from the dose delivery sites. Korean Patent Publication No. 10-2017-00065623 discloses a drug injector device including a housing having an internal space and a lengthwise window, a rotatable dose dial that is maintained in the axial direction with respect to the housing, and a rotatable scale drum to present an indication for displaying the size of the set dose, wherein a sliding element of the scale drum is configured to slide in the axial direction with respect to the housing during the dose setting, the indication presented by the scale drum can be seen through a sliding window and accordingly the lengthwise window and the sliding window are combined with the indication to form a dose size display, the rotatable scale drum is rotated in the internal space formed by the housing during the dose setting, and an inner surface of the sliding element has inner features coupled to outer screw threads on an outer surface of the scale drum. Korean Patent Publication No. 10-2019-0017806 discloses a drug injection device, and more particularly, a drug delivery device including a housing and an actuation mechanism arranged inside the housing, wherein the actuation mechanism includes a plunger rod arranged to act on a stopper of a drug container and an actuator arranged slidable and connected to the plunger rod for acting on the stopper when the actuator is operated by displacing it in a longitudinal direction of the actuation mechanism. SUMMARY The present disclosure is designed to solve the above-described problem of the conventional technology, and therefore the present disclosure is directed to providing a drug injection control device technology having a structure in which a rod guide rotates and a piston rod moving with the rod guide makes a linear motion to stably inject a drug set through a dose dial. To achieve the above-described object, a drug injection control device according to the present disclosure includes a hollow housing 10, a dose dial 20 rotatably coupled to a side of the housing 10, a cartridge holder 30 fixedly coupled to an opposite side of the housing 10 wherein a cartridge containing a drug is received in the cartridge holder 30 and an injection needle is coupled to a side to deliver the drug, an injection button 40 positioned on an outer side of the dose dial 20 and a cap separably coupled to an outside of the cartridge holder 30, and includes an injection amount setting module 100 configured to make a rotational motion with the dose dial 20 in the housing 10 to set an amount of the drug to be injected by storing a twisting moment in a torsion spring 140; and a drug delivery module 200 switchably coupled to the injection amount setting module 100 by the operation of the injection button 40 to deliver the injection amount of the drug set by the injection amount setting module 100 from the cartridge embedded in the cartridge holder 30 by moving through the release of the twisting moment applied to the torsion spring 140, and preferably, the injection amount setting module 100 may include a reset tube 110 s