US-12616791-B2 - Drug injection device

US12616791B2US 12616791 B2US12616791 B2US 12616791B2US-12616791-B2

Abstract

A disclosed drug injection device includes: a case having a drug container located therein at one side; and a discharge amount adjustment module that is provided at the other side inside the case and, while rotating by a set angle only in one direction, adjusts a discharge amount of a drug stored in the drug container while speed is reduced by a speed reduction unit consisting of a combination of gears; a rotation amount detection module that detects a rotation value of the speed reduction unit and transmits detected data to a control device; and a locking module for locking to restrict rotation of the speed reduction unit when the rotation value detected by the rotation amount detection module reaches a set value.

Inventors

Won Jae Jang

Assignees

Won Jae Jang

Dates

Publication Date: 20260505
Application Date: 20230630
Priority Date: 20220701

Claims (2)

1 . A drug injection device comprising: a case having a drug container located on one side therein; a discharge amount adjustment module provided on a side of the case different from the side of the case the drug container is located on, and being rotated by a set angle only in one direction; a rotation amount detection module configured to detect a rotation value of a deceleration unit and to transmit detected data to a controller; and a locking module configured to lock the deceleration unit in order to limit rotation of the deceleration unit when the rotation value detected by the rotation amount detection module reaches a set value, wherein the discharge amount adjustment module comprises: a dial spring having a first fastening hole formed in a center thereof such that a fixed shaft is coupled to the first fastening hole, spring arms formed radially on an outer circumferential surface of the dial spring, and a catching protrusion formed at an end of each spring arm; a dial configured to be rotated in a state in which a part of the dial is exposed through an opening of the case, wherein the part of the dial exposed through the opening of the case is configured to be directly manually rotated by a user, wherein when the dial is directly manually rotated by the user the drug in the drug container is discharged; the dial being provided with a coupling recess coupling the dial spring to the dial while having a second fastening hole of the dial and unidirectional teeth radially formed on an inner circumferential surface of the coupling recess; and the deceleration unit comprising a combination of gears and coupled to the dial so as to be interlocked therewith, the deceleration unit being configured to discharge some amount of the drug stored in the drug container while performing deceleration by multistage connection upon rotation of the dial, wherein the rotation amount detection module comprises: a magnetic body inserted into an end of a power gear of the deceleration unit so as to be rotated upon operation of the discharge amount adjustment module; and a sensor configured to detect a rotation value of the magnetic body and to transmit detected data to the controller, wherein the locking module comprises: an upper bracket provided in a bent state; a lower bracket having one end extending through a lower part of a vertical portion of the upper bracket and a gear stopper with gear teeth configured to stop rotation of a lock gear of the deceleration unit provided at an end of the lower bracket different from the lower bracket's end which extends through the upper bracket, the lock gear having an auxiliary gear formed at an end thereof; a magnet provided at a lower part of the lower bracket; and an electromagnet fixed to a lower part of a horizontal portion of the upper bracket, the electromagnet being magnetized by a flow of current, the electromagnet being configured to couple or separate the gear stopper to or from the lock gear of the deceleration unit according to polarity conversion; and a compression spring configured such that one end of the compression spring is supported by an end of the horizontal portion of the upper bracket vertically above the electromagnet and another end of the compression spring is supported by the end of the lower bracket extending through the vertical portion of the upper bracket, wherein the electromagnet and magnet are both disposed between the compression spring and the auxiliary gear in a direction parallel with the auxiliary gear's axis of rotation, wherein the controller sets a rotation value of the dial of the discharge amount adjustment module, and performs control of the gear stopper such that manual rotation of the dial is stopped when the dial is rotated by the rotation value which was set in the controller, wherein the unidirectional teeth are formed with alternating inclined and vertical surfaces such that, when the inclined surface contacts the catching protrusion of the dial spring, the spring arms are compressed to rotate the dial, and when the vertical surface contacts the catching protrusion of the dial spring, the spring arms are not compressed, wherein the drug in the drug container is discharged while the catching protrusion of the dial spring contacts the inclined surface from one end of the inclined surface to the other end of the inclined surface, wherein when the gear teeth of the gear stopper is engaged with the gear teeth of the auxiliary gear the dial cannot be rotated by the user and when the gear teeth of the gear stopper is disengaged from the gear teeth of the auxiliary gear the dial can be rotated by the user, and wherein the gear stopper is engaged with the auxiliary gear by moving vertically upward and the gear stopper is disengaged from the auxiliary gear by moving vertically downward.
2 . The drug injection device according to claim 1 , wherein the deceleration unit comprises: the power gear interlocked with the dial upon rotation of the dial; the lock gear engaged with one side of the power gear, a sub gear engaged with the power gear on a different side of the power gear than the side of the power gear the lock gear engages with; a rod gear engaged with the sub gear; and a screw helically engaged with a helical groove of the rod gear, the screw being configured to move an airtight portion provided in the drug container upon rotation of the rod gear.

Description

TECHNICAL FIELD The present invention relates to a drug injection device, and more particularly to a device for manually subcutaneously injecting a drug, such as insulin, while being portable. BACKGROUND ART In general, a drug injection device, which is used to inject a drug into a patient's body, is one of the active treatment means and is used by medical professionals such as doctors or nurses, but in most cases, the drug injection device is used by ordinary people, such as patients or guardians. Technology related to the drug injection device has been proposed in Korean Registered Utility Model No. 0486792. However, Patent Document 1 has problems such as pain and exposure of the medical history of patients with underlying diseases due to frequent drug injection for a long period of time, limited places for administration, over-injection, and difficulty in fine adjustment. In addition, other conventional patch-type drug injection devices have various problems such as “skin rash”, “blockage”, “removal upon further injection”, “drug residual amount”, “size” and “weight” of insulin pumps, and “price” and “maintenance cost”, and insulin pens have problems such as “hypoglycemia in case of abnormal injection” and “skin pain in case of additional injection”, and a solution is required to overcome the above problems. (Patent Document 1) Korean Registered Utility Model No. 0486792 (2018.06.25) Technical Problem The present invention has been made in view of the above conventional problems, and it is an object of the present invention to provide a drug injection device capable of solving the problems of pain caused by frequent drug injection and abnormality of fine adjustment injection. It is another object of the present invention to provide a drug injection device capable of solving problems of patch-type drug injection devices, such as “skin rash”, “blockage”, “removal upon further injection”, “drug residual amount”, “size” and “weight” of insulin pumps, and “price” and “maintenance cost”, and problems of insulin pens, such as “hypoglycemia in case of abnormal injection” and “skin pain in case of additional injection”. Technical Solution A drug injection device according to the present invention to accomplish the above objects includes a case having a drug container located on one side therein, a discharge amount adjustment module provided on the other side in the case, the discharge amount adjustment module being configured to adjust the discharge amount of a drug stored in the drug container in a state of being decelerated by a deceleration unit including a combination of gears while being rotated by a set angle only in one direction, a rotation amount detection module configured to detect the rotation value of the deceleration unit and to transmit detected data to a controller, and a locking module configured to lock the deceleration unit in order to limit rotation of the deceleration unit when the rotation value detected by the rotation amount detection module reaches a set value. The discharge amount adjustment module may include a dial spring having a first fastening hole formed in the center thereof such that a fixed shaft is coupled to the first fastening hole, spring arms formed radially on an outer circumferential surface thereof, and a catching protrusion formed at each of ends of the spring arms, a dial configured to be rotated in a state in which a part of the dial is exposed through an opening of the case, the dial being provided with a coupling recess configured to allow the dial spring to be coupled thereto while having a second fastening hole formed in the center thereof and unidirectional teeth radially formed on an inner circumferential surface of the coupling recess, and a deceleration unit coupled to the dial so as to be interlocked therewith, the deceleration unit being configured to discharge a very small amount of the drug stored in the drug container while performing deceleration by multistage connection upon rotation of the dial. The unidirectional teeth may be formed with alternating inclined and vertical surfaces such that, when the inclined surface contacts the catching protrusion of the dial spring, the spring arms are compressed to rotate the dial, and when the vertical surface contacts the catching protrusion of the dial spring, the spring arms are not compressed to prevent rotation of the dial. The deceleration unit may include a power gear interlocked with the dial upon rotation of the dial, a lock gear engaged with one side of the power gear, the locking gear having an auxiliary gear formed at an end thereof, a sub gear engaged with the other side of the power gear, a rod gear engaged with the sub gear, and a screw helically engaged with a helical groove of the rod gear, the screw being configured to move an airtight portion provided in the drug container upon rotation of the rod gear. The rotation amount detection module may include a magnetic body inserted into an end of a po