A dosing adjustment device that temporarily maintains the twist of a torsion spring that applies a rotational force

Abstract

The drug administration adjustment device according to the present invention comprises: an injection amount setting module (100) storing torque in a torsion spring (140) disposed in a housing (10) to set the amount of medicine to be injected; a medicine discharge module (200) moving by releasing the torque applied to the torsion spring (140) to discharge the set amount of medicine from the cartridge built into the cartridge holder (30) to the outside, and comprising a torsion spring (140) having both ends coupled to the housing (10) and the ratchet tube (120); and an anchor (170) slidably coupled to the inside of the housing (10) in a state of being rotatably coupled to the ratchet tube (120). The anchor (170) includes an anchor circumferential protrusion (171) formed on the inner surface along the circumferential direction and a shell coupling protrusion (172) formed on the outer surface along the axial direction, and includes: the anchor circumferential protrusion (171) formed on the inner surface along the circumferential direction; a tube rotation preventing protrusion (173) formed in a serrated shape as a step along the axial direction on the inner surface; and shell coupling protrusions (172, 174) formed on the outer circumferential surface along the axial direction. The tube rotation preventing protrusion (173) is coupled to the rotation preventing member (124) constituting the ratchet tube (120), so that the ratchet tube (120) rotatably coupled to the anchor (170) can only rotate in one direction.

Description

Technical Field

[0001] The present invention relates to a dosing adjustment device that temporarily maintains the twist of a torsion spring applied with a rotational force by a dose dial by rotatably coupling it to a tube linked to the dose dial and selectively fastening it to a housing. Background Art

[0002] An autoinjector is a device that allows patients, even those without medical training, to easily administer medication themselves without exposing the needle to the patient. There is a need for an autoinjector that is compact, easy to use and store, and has a simple structure that facilitates manufacturing, assembly, and usability, thereby reducing manufacturing and assembly costs and minimizing environmental impact.

[0003] The use of a drug delivery device for intradermal drug injection requires considerable skill and experience, and therefore a drug delivery device has recently been disclosed that, when applied to the skin and pressed, inserts an injection needle into the skin to automatically inject the drug.

[0004] Among the injectors for drug injection currently available on the market, pen-type injectors have the function of delivering multiple doses from a drug container, with the dose quantity set before delivery. Since most users of drug delivery devices are inexperienced, it is preferable to provide the user with some indication or information indicating that the dose delivery sequence has been completed and that the drug delivery device can be safely removed from the dose delivery site.

[0005] Korean Patent Publication No. 10-2017-0065623 provides a drug delivery device, specifically, disclosing a housing forming an interior space and having a longitudinal window; a rotatable dose dial axially fixed relative to the housing; a rotatable scale drum carrying markings for indicating the size of a set dose, wherein a sliding element of the scale drum is configured to slide axially relative to the housing during dose setting, and the markings carried by the scale drum are visible through the sliding window, so that the longitudinal window and the sliding window are combined with the markings to form a dose size display, and the rotatable scale drum rotates in the interior space defined by the housing during dose setting, and an internal feature portion is provided on the inner surface of the sliding element to engage with an external thread set on the outer surface of the scale drum.

[0006] Korean Patent Publication No. 10-2019-0017806 provides a drug delivery device, which includes a drug delivery device having a housing and an actuating mechanism arranged in the housing. Its structure includes not only a plunger rod arranged to act on a plug of a drug container, but also an actuating member arranged to be slidable and connected to the plunger rod. When the actuating member is operated to cause it to be displaced in the longitudinal direction of the actuating mechanism, the actuating member acts on the plug. Summary of the Invention

[0007] Technical issues

[0008] The present invention is proposed to solve the above-mentioned conventional problems, and its object is to provide a technology for a drug administration adjustment device, wherein when the drug injection amount is set by a dose dial and the set drug is injected by an injection button, the torsion of a torsion spring applied with a rotational force by the dose dial is temporarily maintained by an anchor having a structure that is rotatably coupled to a tube that is linked to the dose dial and selectively fastened to a housing.

[0009] Technical Solution

[0010] To achieve the above-mentioned purpose, the drug administration adjustment device according to the present invention comprises: a hollow shell 10; a dose dial 20 rotatably coupled to one side of the shell 10; a cartridge holder 30, which, when fixedly coupled to the other side of the shell 10, accommodates a cartridge containing a drug, and is coupled to an injection needle for discharging the drug on one side; an injection button 40, which is arranged in the dose dial 20 and preferably comprises: an injection volume setting module 100, which stores torque in a torsion spring 140 arranged in the shell 10 to set the amount of drug to be injected; a drug discharge module 200, which moves by releasing the torque applied to the torsion spring 140, thereby discharging the set amount of drug from the cartridge built into the cartridge holder 30 to the outside, and the injection volume setting module 100 comprises: a reset tube 110, which is switchably coupled to the reset tube 110 by the action of the injection button 40 on the dose dial 20; a ratchet tube 120, coupled to the outer side of the reset tube 110 and driven to rotate at the same time; a scale drum 130, slidably rotating along the axial direction on the outer surface of the ratchet tube 120; and a torsion spring 140, both ends of which are coupled to the housing 10 and the ratchet tube 120; and an anchor 170, slidably coupled to the interior of the housing 10 when rotatably coupled to the ratchet tube 120, the anchor 170 comprising: an anchor circumferential protrusion 171 protrudingly formed on the inner surface in the circumferential direction; a tube rotation preventing protrusion 173, formed as a step in a serrated shape on the inner surface in the axial direction; and housing coupling protrusions 172, 174, formed on the outer circumferential surface in the axial direction, the tube rotation preventing protrusion 173 being coupled to the rotation preventing member 124 constituting the ratchet tube 120, so that the ratchet tube 120 rotatably coupled to the anchor 170 can only rotate in one direction.

[0011] Preferably, the anchor 170 is rotatably coupled to the anchor coupling groove 122 formed as a groove on the ratchet tube 120 through the anchor circumferential protrusion 171 , and is detachably coupled to the anchor sliding portion 13 formed on the housing 10 through the housing coupling protrusions 172 , 174 .

[0012] Preferably, the guide rod 210 coupled to the reset tube 110 is connected to the interior of the piston rod 220 by a threaded rotation, so that the lower portion of the piston rod 220 can move linearly by rotating the guide rod 210, thereby providing a cartridge drug discharge structure coupled by a threaded connection between the piston rod 220 and the guide rod 210.

[0013] Preferably, both ends of the torsion spring 140 are respectively coupled to a spring seat 150 and a ratchet tube 120 that are non-rotatably coupled to the housing 10. When the dose dial 20 is rotated, the side of the torsion spring 140 fixed to the ratchet tube 120 rotates, while the other side of the torsion spring 140 fixed to the spring seat 150 remains fixed, thereby forming a twisted state of the spring.

[0014] Preferably, the button plate 160 is fixed to a plate fixing step 24 formed along a circumferential direction on the inner surface of the dose dial 20 on a first dial cavity formed by a partition wall in the dose dial 20 .

[0015] Preferably, the injection volume setting module 100 includes a button plate 160 fixedly arranged in the dose dial 20 and serving as a support for the button spring 50. The injection button 40 is slidably connected to the button plate 160. The drug discharge module 200 includes: a guide rod 210, which is switchably connected to the injection volume setting module 100 through the action of the injection button 40; a piston rod 220, which is threadedly connected to the outer side of the guide rod 210 and performs linear motion through the rotation of the guide rod 210, thereby discharging the drug in the cartridge built into the cartridge holder 30 to the outside. The injection button 40 is simultaneously driven to rotate with the rotation of the dose dial 20, but can be pushed stably by the button plate 160.

[0016] Technical Effects

[0017] As described above, according to the drug administration adjustment device of the present invention, the torsion spring is rotated in a state linked to the dose dial within the housing to store torque in the torsion spring, and the amount of the drug to be injected is set by the injection amount setting module. Thus, when the drug injection amount is set in advance according to the user's intention, the torsion spring, which applies a rotational force through the dose dial, is temporarily maintained by the anchor selectively fastened to the housing while being rotatably coupled to the tube linked to the dose dial.

[0018] Furthermore, through the reset tube that can be linked to the injection button, the guide rod is connected to the inside of the piston rod in a threaded rotation manner, so that the lower part of the piston rod can move linearly through the rotation of the guide rod, thereby having a stable cartridge drug discharge structure through the threaded connection between the piston rod and the guide rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A combined three-dimensional diagram showing a drug administration adjustment device according to an embodiment of the present invention.

[0020] Figure 2 Show Figure 1 An exploded perspective view of a dosing adjustment device.

[0021] Figure 3 Show Figure 1 A cross-sectional view of a dosing adjustment device.

[0022] Figure 4 Show Figure 3 Magnified view of the central area.

[0023] Figure 5 The interior of the housing is shown.

[0024] Figure 6 The diagram shows a state where the anchor is rotatably coupled to the ratchet tube.

[0025] Figure 7 Shows the partial shape of the ratchet tube.

[0026] Figure 8 The local shape of the anchor is shown.

[0027] Figure 9 A cross-sectional view showing the combined structure of the ratchet tube and the anchor.

[0028] Figure 10 The figure shows the connection between the dose dial and the reset tube.

[0029] Figure 11 Shows the combined state of the injection button, button plate, reset tube, spring seat and scale cylinder.

[0030] Figure 12 Shows a perspective view of the spring seat.

[0031] Figure 13 Shows the state in which the dose dial, scale cylinder, ratchet tube, reset tube and piston rod are combined.

[0032] Figure 14 Shows the combined state of the injection button, button plate and dose dial.

[0033] Figure 15 Show Figure 3 Magnified view of the left area.

[0034] Figure 16 Shown is the dose dial. DETAILED DESCRIPTION

[0035] The following describes embodiments of the present invention in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and can be implemented in various forms. The purpose of these embodiments is solely to provide a more complete disclosure of the present invention and to fully inform those skilled in the art of the present invention of its scope. The same symbols in the accompanying drawings refer to the same elements.

[0036] When assigning reference numerals to the constituent elements of the drawings, it should be noted that, for identical constituent elements, even if illustrated in different drawings, the identical constituent elements shall be assigned the same reference numerals as much as possible. Furthermore, when describing the embodiments of the present invention, if it is determined that a detailed description of a related well-known structure or function would obscure the gist of the embodiments of the present invention, such detailed description shall be omitted.

[0037] Next, refer to Figures 1 to 16 , illustrating a dosing adjustment device according to an embodiment of the present invention having a rotation of a guide rod 210 and a linear motion structure of a piston rod that moves in conjunction with the guide rod 210, thereby being able to stably inject a set drug through a dose dial.

[0038] The drug delivery device includes: a hollow housing 10; a dose dial 20 rotatably coupled to one side of the housing 10; a cartridge holder 30, which is fixedly coupled to the other side of the housing 10 and accommodates a cartridge containing a drug, and is coupled to one side with an injection needle for expelling the drug; an injection button 40, which is arranged on the outside of the dose dial 20; a button spring 50, which enables the injection button 40 to be pressed and restored within the dose dial 20; and a cover 60, which is detachably coupled to the outside of the cartridge holder 30.

[0039] The present invention includes: an injection volume setting module 100, which rotates in a state linked to the dose dial 20 within the housing 10, thereby storing torque in a torsion spring to set the amount of medicine to be injected; and a medicine discharge module 200, which is switchably coupled to the injection volume setting module 100 through the action of the injection button 40, and moves by releasing the torque applied to the torsion spring, thereby discharging the set amount of medicine set by the injection volume setting module 100 from the cartridge built into the cartridge holder 30 to the outside.

[0040] The injection volume setting module 100 includes: a reset tube 110, which is switchably coupled to the dose dial 20 through the action of the injection button 40; a ratchet tube 120, which is coupled to the outer side of the reset tube 110 and is simultaneously driven to rotate; a scale cylinder 130, which is slidably rotated along the axial direction on the outer surface of the ratchet tube 120; a torsion spring 140, both ends of which are coupled to the housing 10 and the ratchet tube 120; a spring seat 150, one side of the torsion spring 140 coupled to the ratchet tube 120 and the other side of which is fixed to the spring seat 150; a button plate 160, which is fixedly disposed in the dose dial 20 and serves to support the button spring 50; and an anchor 170, which is slidably coupled to the interior of the housing 10 along the axial direction while being rotatably coupled to the ratchet tube 120 in one direction.

[0041] The reset tube 110 is a hollow cylindrical structure, including: a button coupling groove 111 having a groove formed in the circumferential direction on the outer peripheral surface for coupling with the button leg 41 constituting the injection button 40; a dial coupling protrusion 112 that is detachably coupled to the tube coupling protrusion formed inside the dose dial 20; and a first tube coupling member 113 that is coupled to the ratchet tube 120 and can rotate simultaneously with the ratchet tube 120.

[0042] The ratchet tube 120 is a hollow cylindrical structure that can accommodate the reset tube 110 inside. It includes: a tube guide protrusion 121 formed on the outer circumferential surface in the longitudinal direction; an anchor coupling groove 122 formed in the circumferential direction so that the anchor 170 can be rotatably coupled to one side of the ratchet tube 120; a second tube coupling member 123 connected to the first tube coupling member 113 of the reset tube 110; a rotation preventing member 124 formed as a free end in the circumferential direction on one side of the ratchet tube 120 to couple to a tube locking protrusion 173 formed on the inner circumferential surface of the anchor 170; and a ratchet tube connecting member 125 protruding from the end of one side of the reset tube 110.

[0043] The scale cylinder 130 includes: a cylinder guide groove 131, which is formed along the longitudinal direction of the inner surface to correspond to the cylinder guide protrusion formed on the ratchet tube 120; and a cylinder rotation groove 132, which is formed along the spiral shape of the outer peripheral surface to correspond to the cylinder rotation protrusion 11 formed in a spiral shape on the inner surface of the shell 10.

[0044] The two ends of the torsion spring 140 are respectively connected to the spring seat 150 and the ratchet tube 120. When the dose dial 20 is rotated, the side 141 of the torsion spring 140 fixed to the ratchet tube 120 rotates, while the other side 142 of the torsion spring 140 fixed to the spring seat 150 remains fixed, thereby forming a twisted state of the spring.

[0045] The button plate 160 is a circular plate fixedly positioned within a first cavity formed on one side of the dose dial 20, with the dial partition wall serving as a reference point. It includes a central guide hole 161 and a plurality of button guide holes 162 radially formed about the central guide hole. The multiple button legs 41 that comprise the injection button 40 extend through and engage with these guide holes. This allows the injection button 40 to move linearly and stably via the button plate 160, while also securing the button spring 50 to the injection button 40. When the button spring 50 is positioned within the button plate 160 and pressure is applied to the injection button 40, the button plate 160 acts as the lowest point, compressing the injection button 40. The button spring 50 returns to its original position when the pressure is released.

[0046] Anchor 170 includes an anchor circumferential projection 171 formed as a circular protrusion along the inner surface, a first housing engaging projection 172 formed as a free end protrusion along the outer surface, a tube rotation preventing projection 173 formed as a stepped, serrated shape along the axial direction on the inner surface, and a second housing engaging projection 174 formed along the axial direction on the outer circumference. Anchor circumferential projection 171 engages with anchor engaging groove 122, a recessed groove formed in ratchet tube 120, while second housing engaging projection 174 engages with anchor sliding portion 13 formed on the inner surface of housing 10. Furthermore, tube rotation preventing projection 173 engages with rotation preventing member 124 forming part of ratchet tube 120, ensuring that ratchet tube 120, which is rotatably coupled to anchor 170, can rotate in only one direction and cannot rotate in the opposite direction.

[0047] That is, basically, when no pressure is applied to the injection button 40, the anchor 170 is prevented from rotating when it is engaged with the anchor sliding portion 13 formed on the housing 10 via the first housing engagement protrusion 172 and the second housing engagement protrusion 174. When the dose dial is operated in this state, even if the reset tube 110 and the ratchet tube 120 rotate, the anchor remains fixed and does not rotate.

[0048] In addition, when the dose dial is operated to complete the set drug injection amount, the ratchet tube 120 is prevented from reversing by the engagement between the tube rotation preventing protrusion 173 and the rotation preventing member 124 of the ratchet tube 120, thereby temporarily preventing the twisted elastic spring from relaxing.

[0049] refer to Figures 3 to 9 The anchor 170 is rotatably coupled to the anchor coupling groove 122 formed in the ratchet tube 120 via the anchor circumferential protrusion 171. Furthermore, the anchor 170 is detachably coupled to the anchor sliding portion 13 formed on the housing 10 via the housing first coupling protrusion 172 and the housing second coupling protrusion 174.

[0050] That is, the anchor 170 has a structure that slides up and down together with the ratchet tube 120 when the injection button 40 is pressed.

[0051] The anchor 170 combined with the ratchet tube 120 first provides a structure in which only the ratchet tube 120 rotates independently when the ratchet tube 120 is engaged with the inner groove of the housing 10 and does not rotate, thereby preventing the torsion spring from relaxing.

[0052] That is, the anchor plays a role of temporarily maintaining the twisted state of the torsion spring coupled to the ratchet tube 120 .

[0053] refer to Figures 10 to 12 The spring seat 150 is a structure disposed within the dose dial 20 and fixedly coupled to the housing 10 without swinging. It includes a spring seat engagement groove 151 that engages with the end of the torsion spring 140, and a ratchet 152 configured to produce a click when the dose dial 20 is rotated. Specifically, when the dose dial 20 is rotated, the ratchet protrusions 22 formed on one surface of the radially formed dial partition 21 within the dose dial 20 sequentially engage with the ratchet, providing feedback on the injection amount.

[0054] refer to Figures 14 to 16 A button plate 160 is disposed on the first dial cavity 20a, formed on one side relative to the dial partition wall 21 formed within the dose dial 20. The injection button 40 is slidably engaged through a plurality of button guide holes 162 formed in the button plate 160. The plurality of button guide holes 162 are radially arranged at a predetermined distance from the guide fixing hole 161. The distal ends of the plurality of button legs 41 form a curved leg hooking end, thereby preventing detachment when one end is inserted into the button guide hole 162.

[0055] The button plate 160 is fixed to a plate fixing step 24 formed on the inner surface of the dose dial 20 in a circumferential direction on the first dial chamber 20 a .

[0056] That is, the button plate 160 is coupled in conjunction with the rotation of the dose dial 20. In this state, the injection button 40 is rotated and driven simultaneously with the rotation of the dose dial 20, but the button plate 160 enables stable pushing action.

[0057] When the dose dial 20 is rotated without pressing the injection button 40 , the following is shown.

[0058] The reset tube 110 is coupled to a tube coupling tooth profile formed circumferentially on the inner side surface of the dose dial 20. The reset tube 110 is coupled to a scale drum 130, which is coupled to a ratchet tube 120 coupled to the other side of the reset tube 110 and slidably coupled to a drum guide arranged linearly along the outer surface of the ratchet tube 120. The scale drum 130 then positively engages with a drum guide spiral protrusion threadedly formed on the inner surface of the housing 10. Thus, rotation of the dose dial 20 ultimately moves the scale drum 130 a predetermined distance along the housing 10, while simultaneously storing the torque of the torsion spring 140.

[0059] The drug discharge module 200 includes: a guide rod 210, which is switchably coupled to the reset tube 110 by the action of the injection button 40; a piston rod 220, which is threadedly coupled to the outer side of the guide rod 210 and performs linear motion through the rotation of the guide rod 210, thereby discharging the drug in the cartridge built into the cartridge holder 30 to the outside; a rod holder 230, which is coupled to the cartridge holder 30 and is configured to pass through and couple with the piston rod 220 in the axial direction; and a rod locking member 240, which has a structure having a structure that is threadedly coupled to the outer surface of the piston rod 220 within the rod holder 230.

[0060] The guide rod 210 includes a guide body 211 having a guide spiral protrusion 212 that detachably engages with a guide engagement groove formed on the inner surface of the piston rod 220; a guide rotation protrusion 213 protruding from one outer surface of the guide body and detachably engaging with a guide engagement groove formed on the inner surface of the reset tube 110; and a guide ball 214, with the distal end of the guide body axially protruding and engaging with a guide fixing hole formed in the center of the button plate 160. Specifically, the guide rod 210 is fixedly coupled to the guide fixing hole of the button plate 160 of the dose dial 20, thereby engaging with the guide ball and rotating in place without swinging. In this state, the guide rotation protrusion allows for switching between engagement and disengagement with the reset tube 110, and the guide spiral protrusion is threadedly coupled to the piston rod 220, enabling relative movement.

[0061] The piston rod 220 has a hollow cylindrical shape so that the guide rod 210 can pass through and be connected along its axial direction, including a rod propulsion portion 221, which is formed with a locking and connecting protrusion and is rotatably connected to the rod locking piece 240; and a rod locking portion 222, which is formed with a locking shoulder 223, so that the rod locking piece 240 cannot rotate.

[0062] The rod holder 230 has a hollow cylindrical shape and is fixed to the outside of the cartridge holder 30 by a holder fixing shoulder 231 protruding along the circumferential direction on the outer peripheral surface of the rod holder, and the linear movement of the rod locking member 240 is realized by a locking guide portion 232 formed through the outer peripheral surface of the rod holder along the longitudinal direction.

[0063] The rod lock 240 is threadedly coupled to the outer surface of the piston rod 220 and can rotate in conjunction with the linear motion of the piston rod 220 .

[0064] The rod lock 240 includes a locking body 241 for engaging with the outer surface of the piston rod 220, and a locking projection 243 formed axially protruding from one side of the locking body. When inserted into the locking guide 232, the locking projection moves linearly along the axis of the cartridge holder 30. This structure allows the rod lock 240 to move in conjunction with the rotation of the piston rod 220. When rotation is restricted by the locking guide 232, the rod lock 240 can only move linearly with the locking guide 232.

[0065] In the present invention, a guide rod is threadedly coupled to the interior of the piston rod while a screw is formed in the piston rod. As the reset tube rotates, the guide rod coupled to the reset tube rotates in place, and the piston rod matched with the guide rod is lowered to the cartridge holder side.

[0066] A rod lock is rotatably coupled to the external thread of the piston rod. In this state, a rod holder is provided to wrap the piston rod and the rod lock, thereby enabling the rotation of the piston rod and the linear motion of the guide rod.

[0067] When the injection button 40 is actuated, the guide rod 210 coupled to the reset tube 110 is connected to the interior of the piston rod 220 by threaded rotation, thereby achieving linear motion of the lower portion of the piston rod 220 through the rotation of the guide rod 210 .

[0068] According to the above-mentioned medication adjustment device of the present invention, the guide rod 210 rotates and the piston rod moves linearly in conjunction with the guide rod 210 , thereby stably injecting the set medication through the dosage dial.

[0069] The above description is only used as an example to illustrate the technical ideas of the present invention. Ordinary technicians in the technical field to which the present invention belongs can make various modifications and variations without departing from the basic features of the present invention. Therefore, the embodiments disclosed in the present invention are not used to limit the technical ideas of the present invention, but to illustrate the present invention, and the scope of the technical ideas of the present invention is not limited to these embodiments. The scope of protection of the present invention should be interpreted by the attached claims, and all technical ideas within the scope of their equivalents should be understood to be included in the scope of the present invention.

Claims

1. A drug administration adjustment device, comprising: A hollow housing (10); a dosage dial (20) rotatably coupled to one side of the housing (10); The cartridge holder (30) is fixedly coupled to the other side of the housing (10) to accommodate the cartridge containing the drug, and is coupled to one side with an injection needle for discharging the drug; the injection button (40) is disposed in the dose dial (20). The invention is characterized by comprising: An injection volume setting module (100) stores torque in a torsion spring (140) disposed within the housing (10) to set the volume of medicine to be injected; and The drug discharge module (200) moves by releasing the torque applied to the torsion spring (140), thereby discharging a set amount of drug from the cartridge built into the cartridge holder (30) to the outside. The injection volume setting module (100) includes: a reset tube (110) which is switchably coupled to the dose dial (20) by the action of the injection button (40); a ratchet tube (120) which is coupled to the outer side of the reset tube (110) and is simultaneously driven to rotate; a scale cylinder (130) which is slidably rotated along the axial direction on the outer surface of the ratchet tube (120); a torsion spring (140) whose two ends are coupled to the housing (10) and the ratchet tube (120); and an anchor (170) which is slidably coupled to the interior of the housing (10) while being rotatably coupled to the ratchet tube (120). The anchor (170) includes: an anchor circumferential protrusion (171) formed on the inner surface in a circumferential direction; a tube rotation preventing protrusion (173) formed in a stepped shape in a serrated shape along the axial direction on the inner surface; and shell coupling protrusions (172, 174) formed on the outer circumferential surface in the axial direction. The tube rotation preventing protrusion (173) is coupled to the rotation preventing member (124) constituting the ratchet tube (120), so that the ratchet tube (120) rotatably coupled to the anchor (170) can only rotate in one direction. The drug discharge module (200) comprises: The guide rod (210) is switchably coupled to the reset tube (110) in the injection volume setting module (100) through the action of the injection button (40). The guide rod (210) coupled to the reset tube (110) is connected to the interior of the piston rod (220) by means of a threaded rotation, so that the lower portion of the piston rod (220) can be linearly moved by the rotation of the guide rod (210), thereby providing a cartridge drug discharge structure coupled by means of a threaded connection between the piston rod (220) and the guide rod (210).

2. The drug administration adjustment device according to claim 1, characterized in that: The anchor (170) is rotatably coupled to the anchor coupling groove (122) formed as a groove on the ratchet tube (120) through the anchor circumferential protrusion (171). Furthermore, the housing is detachably coupled to an anchor sliding portion (13) formed on the housing (10) via the housing coupling protrusions (172, 174).

3. The drug administration adjustment device according to claim 1, characterized in that: The two ends of the torsion spring (140) are respectively coupled to a spring seat (150) and a ratchet tube (120) which are non-rotatably coupled to the housing (10). When the dose dial (20) is rotated, The side of the torsion spring (140) fixed to the ratchet tube (120) rotates, while the other side of the torsion spring (140) fixed to the spring seat (150) remains fixed, thereby forming a twisted state of the spring.

4. The drug administration adjustment device according to claim 1, characterized in that: The button plate (160) is fixed to a plate fixing step (24) formed along a circumferential direction on the inner surface of the dose dial (20) on a first dial chamber formed by a partition wall in the dose dial (20).

5. The drug administration adjustment device according to claim 1, characterized in that: The injection volume setting module (100) includes a button plate (160) fixedly disposed in the dosage dial (20) and serving to support a button spring (50). The injection button (40) is coupled to the button plate (160) in a slidable penetrating state. The injection button (40) is driven to rotate simultaneously with the rotation of the dosage dial (20), but can be pushed stably by the button plate (160).

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