Automatic chemical injection device

Abstract

An embodiment provides an automatic liquid medication injection device comprising: an activation member slidably installed along a tubular housing, with its proximal end protruding from an initial position outside the housing; a first elastic member that presses the activation member in a proximal direction; a plunger having a plunger rod that slides within a liquid medication container to pressurize the liquid medication, a trigger arm extending from the plunger rod to its distal end, and a trigger protrusion that protrudes outward from the distal end of the trigger arm; a trigger housing that surrounds the outer peripheral surface of the plunger; a safety pin module installed within the tubular housing and inserted between a plurality of trigger arms to cause the trigger arms to expand radially outward, thereby maintaining the lock of the trigger housing and the trigger arms; and a second elastic member installed within the trigger housing that presses the plunger in a proximal direction; wherein the activation member pushes the safety pin module in the distal direction, thereby releasing the lock between the trigger arm and the locking protrusion and activating the plunger.

Description

[Technical Field]

[0001] The embodiment relates to an automatic liquid medicine injection device. [Background technology]

[0002] Autoinjectors are widely used to allow users to inject the liquid themselves without visiting a hospital, for chronic diseases that require continuous management, such as diabetes, or acute attacks that require prompt treatment, such as hypersensitivity shock in allergy sufferers.

[0003] A pen needle-type autoinjector has been developed and is widely used. It is portable and when inserted into the appropriate injection site, the needle is automatically inserted into the muscle and the injection solution is automatically injected using a device such as a spring.

[0004] Korean Patent Publication No. 10-2012-0028294 discloses a dangerous drug injection device.

[0005] According to the prior art, the injector shown in FIG. teeth , the user can of An outer housing adapted to accommodate and substantially house most of the components shown. G In some embodiments, the outer housing 14 is formed from two mating pieces (not shown) that can be configured to be joined together by snap or pressure assembly, or by adhesive or welding, or the like. external The housing 14 includes a fluid chamber 22 therein configured to store and deliver one or more fluid medicaments, such as, for example, one or more hazardous drugs. external Although formed from a pre-filled syringe 18 incorporated within the housing 14, other forms of fluid chambers or medicaments (e.g., including a hollow cartridge that can be pre-filled or re-filled) can be used. external It can be integrally formed within the housing 14 .

[0006] A locking device 80 is disposed at the distal end of the outer housing 14, i.e., at the top end of the housing, and is removably attached thereto by a number of tabs extending through aligned openings formed in the outer housing 14 to form a pressure-fit assembly between the locking device 80 and the outer housing 14. The locking device 80 may be attached to, for example, an injector. of The locking device 80 is configured to prevent or reduce the possibility of the injector being accidentally fired during transport or handling. of To allow for unrestricted use, the injector of It can be removed by the user.

[0007] Also, safety caps 11 The injector of The cap can be secured to the distal end of the outer housing 14 by a press fit, threaded fit, or the like, to prevent accidental movement of the needle guard 66 during shipping or handling prior to injection.

[0008] However, conventional automatic liquid medicine injection devices are provided with a separate locking device 80 and safety cap 11 to prevent accidental operation during handling, and in this case, the procedure for operating the autoinjector involves three steps: removing the locking device 80, removing the safety cap 11, and injecting the liquid medicine.

[0009] Therefore, there is a demand for the development of an automatic liquid medicine injection device that has a simplified structure, reduces the number of parts, is easy to assemble, and can quickly inject liquid medicine by reducing the number of steps required by the user when using the device. Summary of the Invention [Problem to be solved by the invention]

[0010] An object of the embodiment is to provide an automatic liquid medicine injection device which has a simplified structure, reduces the number of parts, and is easy to assemble. [Means for solving the problem]

[0011] The embodiment includes a tube-shaped housing that forms the exterior; a liquid medicine container that includes a liquid medicine storage section that stores the liquid medicine and an injection needle that can penetrate the skin and inject the liquid medicine stored in the liquid medicine storage section and is fixed to the tube-shaped housing; an activation member that is slidably installed along the tube-shaped housing and has a proximal end that protrudes from an initial position to the outside of the housing; a first elastic member that presses the activation member in the proximal direction; a plunger that includes a plunger rod that slides within the liquid medicine container to pressurize the liquid medicine, a trigger arm that extends from the plunger rod to a distal end, and a trigger protrusion that protrudes outward from the distal end of the trigger arm; The automatic liquid drug injection device includes: a trigger housing that surrounds the outer peripheral surface of the plunger; a safety pin module that is installed within the tubular housing and has a safety pin that is inserted between multiple trigger arms to cause the trigger arms to expand radially outward, thereby maintaining the locking of the trigger housing and the trigger arms; and a second elastic member that is installed within the trigger housing and presses the plunger in the proximal direction; and the activation member pushes the safety pin module in the distal direction, thereby releasing the lock on the trigger arms and the locking protrusion, and activating the plunger.

[0012] In another aspect of the embodiment, the trigger housing includes an annular locking projection extending radially inward, and the trigger arm is expanded radially outward by a safety pin; trigger The automatic liquid medicine injection device is characterized in that the protrusion is locked with the locking protrusion.

[0013] In another aspect of the embodiment, an automatic liquid medication injection device is provided, further comprising a fixation element that moves distally to fix the safety pin module after it has been removed from within the trigger arm.

[0014] In another aspect of the embodiment, there is provided an automatic medication injection device, wherein the tubular housing further comprises a distal cap coupled to a distal end thereof, and the fixing element is formed on the distal cap. [Effects of the Invention]

[0015] Furthermore, the automatic liquid medicine injection device provided by the embodiment has the advantage that it is easy to assemble and use since it has a small number of parts and a simple structure. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a diagram showing a chemical liquid injector equipped with an automatic feedback mechanism according to a conventional technique. [Figure 2] 1 is a cross-sectional view showing an initial state of an automatic liquid chemical injection device according to an embodiment. [Figure 3] 1 is a perspective view showing a trigger module of an automatic liquid chemical injection device according to one embodiment. FIG. [Figure 4] 1 is a cross-sectional view showing an initial state of a trigger module of an automatic liquid chemical injection device according to one embodiment. [Figure 5] 1 is a cross-sectional view showing a state when the trigger of the automatic liquid chemical injection device according to the embodiment has been released. FIG. [Figure 6] 1 is a cross-sectional view showing a state after chemical liquid injection is completed in the automatic chemical liquid injection device according to the embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0017] The following detailed description of the embodiments will be given with reference to the accompanying drawings. However, the concept of the present invention may be embodied in many different forms and is not limited to the embodiments disclosed herein. These embodiments are provided as examples so that this disclosure will be thorough and complete and will fully convey the scope of the concept of the present invention to those skilled in the art.

[0018] As used herein, the term "proximal end" refers to that end of a drug delivery device where drug delivery is provided. It is therefore that end of the drug delivery device that points toward the site of injection or delivery. This definition also extends to any internal or external component of the drug delivery device; i.e., the proximal end of any component is the end closest to the proximal end of the drug delivery device. The "distal end" is the end opposite the proximal end.

[0019] "Proximal direction" means a direction from the distal end to the proximal end along the central axis of the drug delivery device. "Distal direction" means the opposite direction from "proximal direction."

[0020] In addition, the term "tube type" refers to a product having an overall tube-shaped or cylindrical shape, and may have slits, holes, grooves, cutouts, etc. formed in parts of the tube or cylinder, or may include protrusions, projections, or flange shapes.

[0021] FIG. 2 is a cross-sectional view showing an initial state of the automatic liquid chemical injection device according to the embodiment, and FIG. 3 is a perspective view showing a trigger module of the automatic liquid chemical injection device according to the embodiment.

[0022] The automatic liquid medicine injection device according to the embodiment has a liquid medicine container, which is fixed by a liquid medicine holder 730, and which includes a liquid medicine storage section 710 that stores the liquid medicine within a tubular housing 100 that forms the exterior, and an injection needle 720 that can penetrate the skin and inject the liquid medicine stored in the liquid medicine storage section 710. Within the tubular housing 100, an activation member 200 and a first elastic member 300 that pressurizes the activation member 200 in the proximal direction are provided on the proximal side of the liquid medicine container, and a plunger 400 that pressurizes the liquid medicine and trigger modules 420, 500, 600, 800 that activate the inactivated plunger 400 by moving the activation member 200 are provided on the distal side of the liquid medicine container.

[0023] The automatic liquid medicine injection device according to the embodiment includes a tubular housing 100 that forms the exterior, and the proximal end side of the tubular housing 100 includes an activation member 200 that is slidably installed along the axial direction, and a first elastic member 300 that presses the activation member 200 in the proximal direction. cap 120 is closed and the proximal end 110 is open, but the proximal end 210 of the activation member 200 is exposed outside the proximal end of the tubular housing 100 before injection of the drug solution.

[0024] On the other hand, in the initial state, the plunger 400 is connected to the trigger modules 420, 500, 600, 800 and the trigger modules 420, 500, 600 are locked and deactivated by the movement of the activation member 200. 800 When the trigger is released, plunger 400 is activated and pressurizes the liquid medicine while sliding from within liquid medicine storage portion 710.

[0025] Within the tubular housing 100, cap Trigger modules 420, 500, 600, and 800 are installed near 120, and the trigger modules include a trigger housing 500 and P Ranja 400 Trigger Arm 420 a second elastic member 600 that is pressed between the trigger housing 500 and the plunger 400; and a safety pin module 800 that maintains the state in which the plunger 400 is coupled to the trigger housing 500.

[0026] The proximal end of the second elastic member 600 is supported by the plunger 400, and the distal end is supported by the trigger housing 500, and the second elastic member 600 is biased so as to be able to bias the plunger 400 in the proximal direction.

[0027] The plunger 400 is locked by the trigger module 420, 500, 600, 800 so as not to move in the proximal direction even under the pressure of the second elastic member 600 until the activation member 200 slides distally to release the trigger of the trigger module.

[0028] The plunger 400 is locked against proximal movement under the pressure of the second resilient member 600 until the activation member 200 slides distally to release the trigger of the trigger module.

[0029] The activation member 200 has a tube-shaped proximal end 210, and the end of the proximal end 210 has a contact surface that comes into contact with the user's skin. A hole is provided in the center of the contact surface, so that the injection needle 720 is exposed through the hole when the activation member 200 is retracted.

[0030] The activation member 200 further includes an activation arm 220 extending distally from the proximal end 210. As the activation arm 220 moves distally, it pushes the safety pin module 800 distally, thereby unlocking the trigger modules 420, 500, 600, and 800 and activating the plunger 400. In one embodiment, the activation member 200 further includes an activation sleeve 250 distally, where the activation arm 220 pushes the activation sleeve 250, which in turn pushes the safety pin module 800. However, the activation sleeve 250 may be omitted, and the activation arm 220 may directly push the safety pin module 800.

[0031] The plunger 400 is 700 The plunger rod 410 slides in the plunger rod 410 to inject a medicinal solution, and a plurality of trigger arms 420 extend distally from the distal end of the plunger rod 410. A ring-shaped support portion 412 for supporting the second elastic member 600 is formed near the proximal end of the plunger rod 410. The plurality of trigger arms 420 are formed at intervals along the outer periphery of the distal end of the plunger rod 410, and the plurality of trigger arms 420 are formed with gaps between each other, and a safety pin 830 of a safety pin module 800 (described later) is placed within the gaps. (See Figure 4) is inserted into the plunger rod 410. A trigger protrusion 422 that protrudes radially outward is formed at the distal end of the trigger arm 420. A packing portion 430 is installed at the proximal end of the plunger rod 410. The packing portion 430 is inserted into a medicinal solution storage portion 710 (described later) and packs the medicinal solution so that it can be injected through the injection needle 720 without tears when the plunger 400 is moved.

[0032] The trigger housing 500 includes a tubular body 510, and an annular locking protrusion 520 is formed along the inner circumferential surface of the body 510 at the distal end side. The distal end of the trigger arm 420 passes through the trigger housing 500 through a central hollow of the locking protrusion 520.

[0033] The safety pin module 800 is coupled to the distal end of the tubular housing 100. The safety pin module 800 is attached to the tubular body 810. (See Figure 4) and tubular fuselage 810 (See Figure 4) A head portion 820 formed at the distal end of the (See Figure 4) and head part 820 (See Figure 4) a safety pin 830 protruding from the trigger arm 420 in the proximal direction and inserted into the gaps between the trigger arms 420; (See Figure 4) It is equipped with:

[0034] When the trigger housing 500 is fixed to the tubular housing 100, the distal end of the trigger housing 500 is located within the safety pin module 800, i.e., the tubular body 810. (See Figure 4) Located inside.

[0035] The trigger protrusion 422 of the trigger arm 420 is secured to a safety pin 830 (See Figure 4) When inserted, the safety pin 830 of the safety pin module 800 spreads outward in the radial direction and locks with the locking protrusion 520 of the trigger housing 500. (See Figure 4) The lock between the trigger housing 500 and the trigger arms 420 will not be released unless the safety pin 830 is removed from the cavity between the plurality of trigger arms 420. At this time, it is preferable that the trigger arms 420 are elastically movable in the radial direction. (See Figure 4) When the safety pin 830 is not inserted between the trigger arms 420, it is desirable that the protruding radius of the trigger protrusion 422 is smaller than the diameter of the inner circumferential surface of the locking protrusion 520 of the trigger housing 500. (See Figure 4) When the trigger arm 420 is removed, the locking protrusion 520 and the trigger protrusion 422 are easily unlocked while the trigger arm 420 moves to its original position.

[0036] When the activation member 200 is moved distally from its initial position by the application of pressure by the user, the safety pin module 800 moves from a first position that locks the trigger module to a second position that releases the trigger of the trigger module.

[0037] At this time, the fixing element 122 is moved to the second position so that the position of the safety pin module 800 is fixed. (See Figure 4) 2 and 3, the tubular housing 100 includes a distal cap 120 closing the distal end, and the distal cap 120 includes a locking element 122 that locks the safety pin module 800 in the second position. (See Figure 4) The securing element 122 is hook-shaped and protrudes inward, and the securing element 122 is fastened to the tubular body 810 while the safety pin module 800 is moved to the second position. (See Figure 4) Thereafter, even if the activation member 200 moves again in the proximal direction and returns to the initial position, the position of the safety pin module 800 is fixed at the second position.

[0038] A medicinal solution container 700 including a medicinal solution storage section 710 for storing medicinal solution and an injection needle 720 for injecting the stored medicinal solution is installed in the tubular housing 100. The medicinal solution container 700 maintains a fixed position in the tubular housing 100 regardless of the movement of the activation member 200 or the plunger 400.

[0039] At this time, the proximal end of the plunger 400 is inserted to a predetermined depth into the medicinal solution storage section 710, and when the second elastic member 600 pressurizes the plunger 400, the plunger 400 moves proximally from within the medicinal solution storage section 710, and the medicinal solution is injected into the user's body through the injection needle 720.

[0040] Figure 4 is a cross-sectional view showing the initial state of the trigger module of an automatic liquid chemical injection device according to one embodiment, Figure 5 is a cross-sectional view showing the state of the automatic liquid chemical injection device according to one embodiment when the trigger is released, and Figure 6 is a cross-sectional view showing the state of the automatic liquid chemical injection device according to one embodiment after liquid chemical injection is completed.

[0041] As previously described, when activation member 200 is moved distally, activation arm 220 pushes head portion 810 of safety pin module 800 distally, releasing safety pin 830 and disengaging the trigger of the trigger module. With safety pin 830 removed, trigger protrusions 422 of trigger arm 420 move radially inward, easily disengaging the locking protrusions 520 of trigger housing 500 from trigger protrusions 422.

[0042] When the lock is released, the restoring force of the compressed second elastic member 600 causes the plunger 400 to receive a pressure force in the base end direction, causing the plunger 400 to move in the base end direction from within the medicinal solution storage section 710, pressurizing the medicinal solution so that it can be injected into the user's body through the injection needle.

Claims

1. A tubular housing that forms the exterior; a drug solution container fixed to the tube-shaped housing, the drug solution container comprising a drug solution storage section for storing the drug solution and an injection needle for penetrating the skin and injecting the drug solution stored in the drug solution storage section; an activation member slidably disposed along the tubular housing, the activation member having a proximal end protruding from an initial position outside the housing; a first resilient member that biases the activation member proximally; a plunger including a plunger rod that slides in the drug solution container to pressurize the drug solution, a trigger arm that extends from the plunger rod to a distal end, and a trigger protrusion that protrudes outward from the distal end of the trigger arm; a trigger housing surrounding the outer periphery of the plunger; a safety pin module disposed inside the tubular housing and including a safety pin inserted between the trigger arms to cause the trigger arms to expand radially outward, thereby maintaining the locking of the trigger housing and the trigger arms; and a second elastic member disposed within the trigger housing and biasing the plunger in a proximal direction; An automatic liquid medication injection device, characterized in that an activation member pushes a safety pin module distally, thereby unlocking a trigger arm and a locking protrusion and activating a plunger.

2. The trigger housing includes an annular locking projection extending radially inward; 2. The automatic liquid medicine injection device according to claim 1, wherein the trigger arm is expanded radially outward by a safety pin, and the protrusion is locked with the locking protrusion.

3. 10. The automatic medication injection device of claim 1, further comprising a locking element that moves distally to lock the safety pin module after removal from within the trigger arm.

4. the tubular housing further comprises a distal cap coupled to the distal end; 4. The automatic medication injection device of claim 3, wherein the fixation element is formed on the distal cap.

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