Dosing control with instant feedback when using the dose dial

Abstract

The drug delivery device according to the present invention comprises: a hollow housing (10); a dose dial (20) rotatably coupled to one side of the housing (10); a cartridge holder (30) which, in a state of being fixedly coupled to the other side of the housing (10), accommodates a cartridge containing a drug, and is coupled to one side with an injection needle for discharging the drug; an injection button (40) disposed in the dose dial (20); and a spring seat (150) which is non-rotatably coupled to the housing (10) and comprises: an injection volume setting module (100) which stores torque in a torsion spring (140) disposed in the housing (10) to set the injection volume required. The invention relates to a drug discharge module (200) for discharging a set amount of drug from a cartridge built into the cartridge holder (30) by releasing the torque applied to the torsion spring (140) to move, thereby discharging a set amount of drug from the cartridge built into the cartridge holder (30) to the outside, wherein the spring seat (150) includes a ratchet (152) formed to correspond to a ratchet protrusion (22) formed on the dose dial (20) when the dose dial (20) is driven to rotate, and a plurality of ratchet protrusions (22) radially formed on one side of the inner partition wall of the dose dial (20) are sequentially connected with the ratchet (152) to produce a sound, thereby providing feedback on the injection amount.

Description

Technical Field

[0001] The present invention relates to a drug administration control device, in which a spring seat is non-rotatably combined with a shell body rotatably connected to a dosage dial, and instant feedback can be given to the setting of the drug dosage through discontinuous contact between a ratchet formed on the spring seat and a ratchet protrusion formed on the dosage dial. Background Art

[0002] An auto injector is a product that allows patients or people who have not received medical training to easily administer medication by themselves, without exposing the injection needle to the patient. An auto injector is needed that is small and easy to use and store, has a simple structure and is easy to manufacture, assemble and usable, thereby reducing manufacturing and assembly costs, and does not have a significant impact on the environment.

[0003] When using a drug delivery device for intradermal drug injection, considerable skills and experience are required, and therefore a drug delivery device has recently been disclosed, which, when attached to the skin and pressed, causes an injection needle to be inserted into the skin to automatically inject the drug.

[0004] Among the syringes for drug injection circulating on the market, pen-type syringes have the function of supplying multiple doses from a drug container, and setting the dose quantity before delivering the dose. Since most users of drug delivery devices have little experience, it is preferred to provide some indication or information to the user indicating that the dose delivery sequence has been executed and 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, a shell forming an internal space and having a longitudinal window; a rotatable dose dial fixed axially relative to the shell; a rotatable scale drum carrying a mark for indicating the size of a set dose, a sliding element of the scale drum is set to slide axially relative to the shell during dose setting, and the mark carried by the scale drum is visible through the sliding window, so that the longitudinal window and the sliding window are combined with the mark to form a dose size display, the rotatable scale drum rotates in the internal space defined by the shell 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, including a drug delivery device having a housing and an actuating mechanism arranged in the housing, wherein the structure includes not only a plunger rod arranged to act on a plug of a medicament container, but also an actuating member arranged to be slidable and connected to the plunger rod, and when the actuating member is operated to cause displacement in the longitudinal direction of the actuating mechanism, the actuating member acts on the plug. Summary of the invention

[0007] Problem that the invention aims to solve

[0008] The present invention is proposed to solve the above-mentioned existing problems, and its purpose is to provide a technology of a drug administration adjustment device. When the drug injection amount is set by a dose dial and the set drug is injected by an injection button, a spring seat is non-rotatably combined with the end of a shell to which the dose dial is rotatably connected, and the ratchet formed on the spring seat is discontinuously contacted with the ratchet protrusion formed on the dose dial, so that instant feedback can be given to the drug usage amount setting when the dose dial is used.

[0009] Technical solutions to solve problems

[0010] To achieve the above-mentioned purpose, the drug delivery device of the present invention comprises: 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 discharging the drug; an injection button 40, which is disposed in the dose dial 20; and a spring seat 150, which is non-rotatably coupled to the housing 10, preferably comprising: an injection volume setting module 100, which stores torque in a torsion spring 140 disposed in the housing 10 to set the required injection volume. The amount of the drug to be injected; and the drug discharge module 200, which moves by releasing the torque applied to the torsion spring 140, thereby discharging the set amount of the drug from the cartridge built into the cartridge holder 30 to the outside, and the spring seat 150 includes a ratchet 152 formed to correspond to the ratchet protrusion 22 formed on the dose dial 20 when the dose dial 20 is rotated and driven, and a plurality of ratchet protrusions 22 radially formed on one side of the inner partition wall of the dose dial 20 are connected with the ratchet 152 in sequence to make a sound, to provide feedback on the injection amount.

[0011] Preferably, the injection volume setting module 100 includes: a reset tube 110, which can be switchably combined with the dose dial 20 through the action of the injection button 40; a ratchet tube 120, which is combined with the outer side of the reset tube 110 and is simultaneously driven to rotate; a scale cylinder 130, which can rotate slidably along the axial direction on the outer surface of the ratchet tube 120; a torsion spring 140, both ends of which are combined with the housing 10 and the ratchet tube 120, and the guide rod 210 combined with the reset tube 110 is connected to the inside of the piston rod 220 by a threaded rotation, so that the lower part of the piston rod 220 can move linearly through the rotation of the guide rod 210, so as to have a cartridge drug discharge structure combined by a threaded manner between the piston rod 220 and the guide rod 210.

[0012] Preferably, both ends of the torsion spring 140 are respectively combined with the spring seat 150 and the ratchet tube 120. 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, so as to form a twisted state of the spring.

[0013] 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 in a first dial cavity formed by a partition wall in the dose dial 20 .

[0014] The injection volume setting module 100 includes a button plate 160 fixedly arranged in the dose dial 20 and playing the role of supporting 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 can be 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, so as to discharge 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 through the button plate 160.

[0015] Effects of the Invention

[0016] As described above, according to the drug administration adjustment device of the present invention, a rotational motion is performed in a housing in a state of linkage with a dose dial to store torque in a torsion spring, and the amount of the drug to be injected is set by an injection amount setting module, so that when the drug injection amount is set in advance according to the user's intention, the drug injection amount is set by the dose dial and the set drug is injected by the injection button, a spring seat is non-rotatably combined with the end of the housing to which the dose dial is rotatably connected, and the ratchet formed on the spring seat is discontinuously in contact with the ratchet protrusion formed on the dose dial, so that instant feedback can be given to the drug usage amount setting when the dose dial is used.

[0017] Furthermore, through the reset tube which can be linked with 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 which is coupled by the threaded manner between the piston rod and the guide rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A combined stereogram showing a drug delivery adjustment device according to an embodiment of the present invention;

[0019] Figure 2 Show Figure 1 An exploded perspective view of a drug delivery adjustment device;

[0020] Figure 3 Show Figure 1 A cross-sectional view of a drug delivery adjustment device;

[0021] Figure 4 Show Figure 3 A magnified view of region A;

[0022] Figure 5 A diagram showing the combined relationship between the dosage dial and the reset tube;

[0023] Figure 6 Shows the combined state of the injection button, button plate, reset tube, spring seat and scale cylinder;

[0024] Figure 7 A perspective view showing a spring seat;

[0025] Figure 8 The diagram shows the combined state of the dose dial, the scale cylinder, the ratchet tube, the reset tube and the piston rod.

[0026] Fig. 9 Shows the combined state of the injection button, button plate and dose dial.

[0027] Fig.10 Show Figure 3 A magnified view of region B;

[0028] Fig.11 The dose dial is shown. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various forms. The purpose of these embodiments is only to make the disclosure of the present invention more complete and to fully inform the scope of the present invention to ordinary technicians in the technical field to which the present invention belongs. The same symbols in the drawings refer to the same elements.

[0030] When assigning reference numerals to the constituent elements of the drawings, it should be noted that for the same constituent elements, even if they are illustrated in different drawings, the same constituent elements have the same reference numerals as much as possible. In addition, when describing the embodiments of the present invention, when it is determined that the detailed description of the relevant well-known structure or function will confuse the gist of the embodiments of the present invention, its detailed description will be omitted.

[0031] Next, refer to Figures 1 to 11 , 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, so that a set drug can be stably injected through a dose dial.

[0032] The drug delivery device includes: a hollow shell 10; a dose dial 20 rotatably coupled to one side of the shell 10; a cartridge holder 30, which accommodates a cartridge containing a drug while being fixedly coupled to the other side of the shell 10, 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; a button spring 50, which enables the injection button 40 to be pressed and restored in the dose dial 20; and a cover 60, which is detachably coupled to the outside of the cartridge holder 30.

[0033] The present invention includes: an injection volume setting module 100, which rotates in a housing 10 in a state linked with a dose dial 20, 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.

[0034] The injection volume setting module 100 includes: a reset tube 110, which can be 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 can slidably rotate 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 arranged in the dose dial 20 and plays a role in supporting the button spring 50; and an anchor 170, which can be slidably coupled to the inside of the housing 10 while being rotatably coupled to the ratchet tube 120.

[0035] The reset tube 110 is a hollow cylindrical structure, including: a button coupling groove 111, a groove formed in the circumferential direction of the outer surface to be coupled with the button leg 41 constituting the injection button 40; a dial coupling protrusion 112, which is detachably coupled to the tube coupling protrusion formed inside the dose dial 20; and a tube coupling member 113, which is coupled to the ratchet tube 120 and can rotate simultaneously with the ratchet tube 120.

[0036] The ratchet tube 120 is a hollow cylindrical structure that can accommodate the reset tube 110 inside, and includes: a tube guide protrusion 121 that is formed on the outer circumferential surface along the longitudinal direction; an anchor coupling groove 122 that is formed along the circumferential direction. A groove allows the anchor 170 to be rotatably coupled to one side of the ratchet tube 120; a second tube coupling piece 123 that is connected to the first tube coupling piece of the reset tube 110; and a tube spring hanging groove 124 that can be coupled to the end of the torsion spring 140.

[0037] The scale cylinder 130 includes: a cylinder guide groove 131, which is formed with a groove along the longitudinal direction on 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 with a groove along a spiral shape on the outer peripheral surface to correspond to the cylinder rotation protrusion formed in a spiral shape on the inner surface of the shell 10.

[0038] 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.

[0039] The spring seat 150 is a structure disposed inside the dose dial 20 and fixedly coupled to the housing 10 without swinging, and includes: a spring seat hooking groove 151 capable of coupling with the end of the torsion spring 140; and a ratchet 152 formed to correspond to the ratchet protrusion 22 formed on the dose dial 20 and make a clicking sound when the dose dial 20 is rotated. That is, when the dose dial 20 is rotated, the ratchet protrusion 22 formed on one surface of the dial partition wall 21 formed in the radial direction inside the dose dial 20 and the ratchet are sequentially coupled to provide feedback on the injection amount.

[0040] The button plate 160 is in the shape of a circular plate and is fixedly arranged in a first chamber formed on one side with the dial partition wall of the dose dial 20 as a reference. It includes a guide fixing hole 161 formed in the center of the button plate 160 and a plurality of button guide holes 162 formed radially with the guide center hole as the center. The plurality of button legs 41 constituting the injection button 40 are connected through the plurality of button guide holes. That is, the injection button 40 can perform stable linear motion through the button plate 160, and the button spring 50 is stably arranged on the injection button 40. When the button spring 50 is placed on the button plate 160 and presses the injection button 40, the button plate 160 is compressed as the lowest point, and returns to its original state when the pressure is released.

[0041] refer to Figures 8 to 11 A button plate 160 is disposed on the first dial chamber 20a formed on one side with the dial partition wall 21 formed in the dose dial 20 as a reference, and the injection button 40 is slidably coupled 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 certain distance with the guide fixing hole 161 as the center. The ends of the plurality of button legs 41 form leg hooking ends of a bent structure, thereby preventing the phenomenon of separation when one end is inserted into the button guide hole 162.

[0042] The button plate 160 is fixed to a plate fixing step 24 formed on the inner surface of the dose dial 20 in the circumferential direction on the first dial chamber 20 a .

[0043] That is, the button plate 160 is coupled in a linked manner with the rotation of the dose dial 20. In this state, although the injection button 40 is driven to rotate simultaneously with the rotation of the dose dial 20, the button plate 160 can perform a stable pushing action.

[0044] The anchor 170 includes an anchor circumferential protrusion 171 formed on the inner surface along the circumferential direction and a housing coupling protrusion 172 formed on the outer surface along the axial direction. The anchor circumferential protrusion 171 is correspondingly coupled to the anchor coupling groove 122 formed as a groove on the ratchet tube 120, and the housing coupling protrusion 172 is correspondingly coupled to the anchor sliding portion 11 formed on the inner surface of the housing 10.

[0045] When the injection button 40 is not pressed, the dose dial 20 is rotated as shown below.

[0046] The reset tube 110 is coupled to a tube coupling tooth shape formed along the circumferential direction on the inner side surface of the dose dial 20, and in a state of being coupled to a scale drum 130 coupled to a ratchet tube 120 coupled through the other side of the reset tube 110 and slidably coupled to a drum guide rail arranged in a straight line along the axial direction on the outer surface of the ratchet tube 120, the scale drum 130 is coupled in a form-fitting state with a drum guide spiral protrusion formed by a thread on the inner surface of the housing 10. Thus, the rotational drive of the dose dial 20 ultimately enables the scale drum 130 to move a predetermined distance along the housing 10 while storing the torque of the torsion spring 140.

[0047] The drug discharge device 200 includes: a guide rod 210, which is switchably coupled to the reset tube 110 through the action of the injection button 40; a piston rod 220, which is threadedly coupled to the outer surface of the guide rod 210 and performs linear motion through the rotational motion 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 be coupled to the piston rod 220 in the axial direction; and a rod locking member 240, which has a structure that is threadedly coupled to the outer surface of the piston rod 220 in the rod holder 230.

[0048] The guide rod 210 includes: a guide body 211, formed with a guide spiral protrusion 212 that can be detachably coupled to a guide coupling groove formed on the inner surface of the piston rod 220; a guide rotation protrusion 213 that is protrudingly formed on one side of the outer surface of the guide body and can be detachably coupled to the guide coupling groove formed on the inner surface of the reset tube 110; and a guide ball 214 that is coupled to a guide fixing hole formed in the center of the button plate 160 in a state where the end of the guide body is axially protruding. That is, the guide rod 210 is coupled to the guide fixing hole of the button plate 160 of the dose dial 20 by being fixedly coupled to the guide ball, so that it can rotate in place without swinging up and down. In this state, the guide rotation protrusion has a switching state that can be coupled to and separated from the reset tube 110, and the guide spiral protrusion is threadedly coupled to the piston rod 220, so that it can move relatively.

[0049] 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.

[0050] 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 a locking guide portion 232 formed through the outer peripheral surface of the rod holder along the longitudinal direction realizes the linear movement of the rod locking member 240.

[0051] 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 .

[0052] The rod lock 240 includes a lock body 241 for coupling with the outer surface of the piston rod 220 and a lock protrusion 243 formed and protruded in the axial direction on one side of the lock body. The lock protrusion moves linearly along the axial direction of the cartridge holder 30 when inserted into the lock guide 232. With the structure, the rod lock 240 moves in conjunction with the rotation of the piston rod 220, and can only move linearly with the lock guide 232 when the lock guide 232 restricts rotation.

[0053] The invention forms a screw in the piston rod, and the guide rod is threadedly coupled to the inside of the piston rod. As the reset tube rotates, the guide rod coupled to the reset tube rotates in situ, and the piston rod matched with the guide rod is lowered to the cartridge holder side.

[0054] The rod lock piece is rotatably coupled to the external thread of the piston rod. In this state, the rod holder is provided to wrap the piston rod and the rod lock piece, thereby realizing the rotation of the piston rod and the linear motion of the guide rod.

[0055] When the injection button 40 is actuated, the guide rod 210 coupled to the reset tube 110 is coupled to the interior of the piston rod 220 by threaded rotation, so that the lower portion of the piston rod 220 can move linearly by the rotation of the guide rod 210 .

[0056] According to the above, the drug administration adjustment device of the present invention has a rotation structure of the guide rod 210 and a linear motion structure of the piston rod that moves in conjunction with the guide rod 210, so that the set drug can be stably injected through the dosage dial.

[0057] The above description is only used as an example to illustrate the technical idea of ​​the present invention, and ordinary technicians in the technical field to which the present invention belongs can make various modifications and deformations 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 idea of ​​the present invention, but to illustrate the present invention, and the scope of the technical idea 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 their equivalent scope 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); A cartridge holder (30) which, in a state of being fixedly coupled to the other side of the housing (10), accommodates a cartridge containing a drug, and is coupled to one side with an injection needle for discharging the drug; an injection button (40) which is disposed in the dosage dial (20); and a spring seat (150) which is non-rotatably coupled to the housing (10). The invention is characterized by comprising: An injection volume setting module (100) stores torque in a torsion spring (140) disposed in the housing (10) to set the volume of the drug 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 spring seat (150) comprises a ratchet (152) formed to correspond to a ratchet protrusion (22) formed on the dose dial (20) when the dose dial (20) is driven to rotate, and a plurality of ratchet protrusions (22) radially formed on one side of an inner partition wall of the dose dial (20) are sequentially connected with the ratchet (152) to generate a sound, thereby providing feedback on the injection amount. The injection volume setting module (100) comprises: a reset tube (110) which is switchably coupled to the dosage 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); and a torsion spring (140) whose two ends are coupled to the housing (10) and the ratchet tube (120). The drug discharge module (200) comprises: a guide rod (210) coupled to the reset tube (110); and a hollow piston rod (220). The guide rod (210) is connected to the inside of the piston rod (220) by means of a threaded rotation, so that the lower part of the piston rod (220) can be linearly moved by the rotation of the guide rod (210), thereby having a cartridge drug discharge structure that is coupled by means of a thread between the piston rod (220) and the guide rod (210).

2. The drug administration adjustment device according to claim 1, characterized in that: The two ends of the torsion spring (140) are respectively coupled to the spring seat (150) and the ratchet tube (120). When the dosage dial (20) is rotated, The side of the torsion spring (140) fixed to the ratchet tube (120) is rotatable, while the other side of the torsion spring (140) fixed to the spring seat (150) remains fixed, so as to form a twisted state of the spring.

3. 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).

4. The drug administration adjustment device according to claim 1, characterized in that: The injection volume setting module (100) comprises a button plate (160) fixedly arranged in the dosage dial (20) and serving to support a button spring (50). The injection button (40) is slidably connected to the button plate (160). The guide rod (210) can be switchably coupled to the injection volume setting module (100) through the action of the injection button (40). The piston rod (220) is threadedly coupled to the outer side of the guide rod (210), and linearly moves through the rotation of the guide rod (210), thereby expelling the medicine in the cartridge built into the cartridge holder (30) to the outside. The injection button (40) is driven to rotate simultaneously with the rotation of the dosage dial (20), but a pushing action can be stably performed through the button plate (160).

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