Large capacity automatic injector

Abstract

The disclosed invention comprises: a main body portion to which a drug cartridge is coupled on one side of the interior; a piston rod that provides a pressurizing force to spray a drug stored inside the drug cartridge while rotating along the interior of the main body portion; a piston rod trigger provided on the other side of the interior of the main body portion to unlock a state so that the elastically supported piston rod moves toward the drug cartridge by means of elastic force upon operation; and a piston rod guide coupled to one end of the piston rod to guide the piston rod to rotate when the piston rod trigger is operated. According to the present invention, the drug administration process is simplified by designing for intuitive operation by the user, and the psychological burden on the patient is reduced by minimizing complex operation processes. Furthermore, the invention focuses on ensuring the safety and accuracy of drug administration through a precise injection volume control mechanism and structural improvements, and significantly enhancing the efficiency of the overall treatment process. In addition, the present invention maximizes user convenience by adopting a design that allows for easy loading of high-dose hormone preparations and similar drugs. Such technological advancements further advance the medical environment for infertility treatment and provide patients with a positive and stable treatment experience. In conclusion, the present invention is an innovative and practical technology that can substantially reduce the inconvenience and burden faced by patients during infertility treatment and contribute to increasing the likelihood of treatment success.

Description

Technology Field

[0001] The present invention relates to a large-capacity automatic syringe, and more specifically, to a syringe that is portable in a pen type and automatically injects drugs subcutaneously. Background Technology

[0002] Generally, women undergoing infertility treatment must endure a demanding treatment process involving the repeated administration of high-dose medication over long periods. Conventional disposable syringes clearly have technical limitations in meeting these treatment needs, acting as a major factor causing physical discomfort and psychological stress for patients. For example, while high-dose medications such as Prolutex require continuous and frequent administration, patients experience discomfort during the repetitive injection process due to a psychological fear of needles, pain during the injection, and a lack of ease of use. These issues hinder the sustainability of treatment and increase the burden felt by patients, thereby weakening their will to continue treatment.

[0003] Technology related to such automatic syringes has been proposed in Korean Registered Patent No. 0977283.

[0004] However, Patent Document 1 highlights the need for a new technical approach and an innovative solution to perform infertility treatment more effectively, as the amount of drug solution injected by the movement of the plunger is fixed, making it difficult to control the injection amount. Prior art literature

[0005] Korean Registered Patent No. 0977283 (August 16, 2010) The problem to be solved

[0006] The present invention has been devised in consideration of the above points, and the objective of the present invention is to provide a pen-type high-volume automatic syringe capable of administering high-dose drugs, which are essential in the treatment process for infertility or hormones, more safely and efficiently. means of solving the problem

[0007] A large-capacity automatic syringe (10) according to the present invention for achieving the above objective may be characterized by comprising: a main body (100) to which a drug cartridge is coupled to one side of the interior; a piston rod (300) that provides a pressurizing force to spray a drug stored inside the drug cartridge (700) while rotating along the interior of the main body (100); a piston rod trigger (200) provided on the other side of the interior of the main body (100) to unlock a locked state so that the elastically supported piston rod (300) moves toward the drug cartridge (700) by means of elastic force when operated; and a piston rod guide (500) coupled to one end of the piston rod (300) to guide the piston rod (300) to rotate when the piston rod trigger (200) is operated.

[0008] It may further include a protective cap (740) that is coupled to surround the injection needle (730) of the drug cartridge (700) while positioned inside the main body (100), and adjusts the withdrawal distance of the injection needle (720) as the upper portion, which is divided by the downward distance of the piston rod (300), moves downward.

[0009] The above main body (100) comprises: a first body (110); a second body (120) having one end spirally fastened to one end of the first body (110) and having a spiral projection (122) formed on one end; a body top (130) having a clip (136) attached to the other end of the first body (110) and having the protective cap (740) located inside, and a tip (140) having a length that is spirally fastened to the spiral projection (122) formed on one end of the second body (120) and is adjusted according to the amount of fastening. The device may be characterized by including a leveler (150) in which a scale (128) corresponding to a scale of a drug cartridge (700) is formed on the outer surface of one end of the second body (120) to which the tip (140) is spirally connected, so that when the position of the tip (140) is adjusted, one end comes into close contact with the other end of the tip (140) and the other end indicates the position of the scale (128).

[0010] The leveler (150) may be characterized by having a guide projection (7444) formed on the outer surface of the lower cap (744) of the protective cap (740) coupled to a groove (1520) formed along the inner surface, so that the protective cap (740) moves in conjunction with the movement.

[0011] The above piston rod (300) may be characterized by having a stopper projection (312) formed to support one end of an elastic part (600) located between the ends of the main body part (100) in the middle, and a screw groove (314) formed on the outer surface of one end so that the screw groove (314) is coupled to a screw projection (510) formed on the inner surface of the piston rod guide (500) and rotates when moving.

[0012] The device may further include a piston rod holder (400) positioned inside the main body (100) so that the locking projection (312) of the piston rod (300) remains engaged with the binding projection (410) provided at the end, and then detaches from the binding projection (410) when the piston rod trigger (200) is pressed.

[0013] The protective cap (740) may be characterized by including: an upper cap (742) in which the injection needle (730) is positioned inside while the end of the drug cartridge (700) is coupled; a lower cap (744) coupled to the lower part of the upper cap (742), having a radial guide projection (7444) formed on the upper outer surface, and adjusting the withdrawal distance of the injection needle (730) according to the movement distance of the upper cap (742); and a cap spring (746) in which both ends are supported inside the upper and lower caps (742, 744), which is compressed when the upper cap (742) descends and restored when the upper cap (742) rises.

[0014] The above piston rod trigger (200) may be characterized by being supported by a trigger spring (210) and moving to its original position when pressure is released. Effects of the invention

[0015] According to the present invention, the drug administration process is simplified by designing it for intuitive user operation, and the psychological burden on patients is reduced by minimizing complex operational procedures. Furthermore, the invention focuses on ensuring the safety and accuracy of drug administration through a precise injection volume control mechanism and structural improvements, while significantly enhancing the overall efficiency of the treatment process. In addition, the present invention maximizes user convenience by adopting a design that allows for the easy loading of high-dose hormone preparations and similar drugs. These technological advancements further improve the medical environment for infertility treatment and provide patients with a positive and stable treatment experience. In conclusion, the present invention is an innovative and practical technology that can substantially reduce the discomfort and burden faced by patients during infertility treatment and contribute to increasing the likelihood of treatment success.

[0016] To explain in more detail, since injecting a large volume of solution too quickly during the process of injecting medication from the cartridge can cause damage to skin tissue, the piston rod is rotated to control (slow down) the piston's movement speed, allowing for medication injection at a speed that prevents skin tissue damage. Additionally, a syringe equipped with a protective cap on the needle can be fixed and used without removing the cap. The second body can be disassembled to insert the syringe and then re-secured. The volume of the solution can be adjusted between 0.5cc and 1cc by operating the tip and leveler. The protective cap attached to the needle moves towards the upper cap during use, exposing the needle, and retracts after use, ensuring safety. The lower cap features a four-part connection point with the upper cap; it utilizes a piston structure that moves through the protrusions of the upper cap under piston force and is launched by a one-touch button, making it convenient to use. Since the medication cartridge is replaced while the protective cap is attached to the needle, it protects the needle and prevents bending. Although the medication cartridge is inserted into the main body, the amount of medication supplied can be visually checked through the scale formed on the main body, allowing for the medication's The injection volume can be perceived, and the degree of needle exposure is adjusted according to the compression length of the upper and lower caps, allowing it to be used according to skin thickness. Furthermore, since the drug supply volume can be adjusted proportionally to the degree of needle exposure, it is effective in delivering an accurate amount of medication. Brief explanation of the drawing

[0017] FIG. 1 is an exploded perspective view illustrating a large-capacity automatic syringe of the present invention. FIG. 2 is a perspective view illustrating a large-capacity automatic syringe of the present invention. FIG. 3 is a perspective view illustrating the state in which the second body is separated in the high-capacity automatic syringe of the present invention, and the state in which the drug cartridge is combined in the state in which the second body is separated. FIG. 4 is a front view showing the withdrawal length of the injection needle according to the position of the tip in the high-capacity automatic syringe of the present invention. FIG. 5 is a cross-sectional view showing the withdrawal length of the injection needle according to the position of the tip in the high-capacity automatic syringe of the present invention. FIG. 6 is a cross-sectional view showing the state before and after operation of the piston rod holder in a large-capacity automatic syringe according to the present invention. FIG. 7 is an exploded perspective view and an assembled perspective view illustrating a drug cartridge and a protective cap in a large-capacity automatic syringe according to the present invention. FIG. 8 is a cross-sectional view illustrating a protective cap in a large-capacity automatic syringe according to the present invention. FIG. 9 is an exploded perspective view illustrating a protective cap and a second body equipped with a tip, a leveler, and a guide projection in a large-capacity automatic syringe according to the present invention. FIG. 10 is a cross-sectional view illustrating the state in which a protective cap is linked with a leveler in a large-capacity automatic syringe according to the present invention. Specific details for implementing the invention

[0018] The above-mentioned objects, features, and other advantages of the present invention will become more apparent by describing preferred embodiments of the present invention in detail with reference to the accompanying drawings. Hereinafter, a high-capacity automatic syringe according to an embodiment of the present invention will be described in detail with reference to the attached drawings.

[0019] FIG. 1 is an exploded perspective view illustrating a large-capacity automatic syringe of the present invention, FIG. 2 is a perspective view illustrating a large-capacity automatic syringe of the present invention, FIG. 3 is a perspective view illustrating a state in which the second body is separated from the large-capacity automatic syringe of the present invention and a state in which a drug cartridge is combined with the second body separated, FIG. 4 is a front view showing the withdrawal length of the injection needle according to the position of the tip in the large-capacity automatic syringe of the present invention, FIG. 5 is a cross-sectional view showing the withdrawal length of the injection needle according to the position of the tip in the large-capacity automatic syringe of the present invention, FIG. 6 is a cross-sectional view partially illustrating the state before and after operation of the piston rod holder in the large-capacity automatic syringe according to the present invention, FIG. 7 is an exploded perspective view and an assembled perspective view illustrating the drug cartridge and protective cap in the large-capacity automatic syringe according to the present invention, FIG. 8 is a cross-sectional view illustrating the protective cap in the large-capacity automatic syringe according to the present invention, FIG. 9 is an exploded perspective view illustrating the protective cap equipped with a tip, a leveler, and a guide projection, and the second body in the large-capacity automatic syringe according to the present invention, FIG. 10 is a cross-sectional view illustrating the state in which a protective cap is linked with a leveler in a large-capacity automatic syringe according to the present invention.

[0020] Referring to FIGS. 1 to 10, a large-capacity automatic syringe (10) according to one embodiment of the present invention comprises a main body (100), a piston rod trigger (200), a piston rod (300), a piston rod holder (400), a piston rod guide (500), an elastic part (600), and a drug cartridge (700), and is a device equipped in a pen type that can control the dosage of a large-capacity drug stored in the drug cartridge (700).

[0021] As shown in FIGS. 1 to 6, the main body (100) has a piston rod trigger (200), a piston rod (300), a piston rod holder (400), a piston rod guide (500), an elastic part (600), and a drug cartridge (700) located inside, and includes a first body (110), a second body (120), a body top (130), a tip (140), and a leveler (150).

[0022] The first body (110) is formed with a through-hole, and a spiral projection (112) is formed on the lower outer surface to be spirally connected with a spiral groove (124) formed on the upper inner surface of the second body (120), and a spiral groove (114) is formed on the upper inner surface to be spirally connected with a spiral projection (132) formed on the lower outer surface of the body top (130).

[0023] The second body (120) is formed with a through-hole, and a spiral projection (122) is formed on the lower outer surface to be spirally connected with a spiral groove (142) formed on the upper inner surface of the tip (140), and a spiral groove (124) is formed on the upper inner surface to be spirally connected with a spiral projection (112) formed on the lower outer surface of the first body (110), and a scale (128) is marked on a step (126) formed on the outer surface adjacent to the spiral projection (122).

[0024] At this time, the scale (128) is marked with the same spacing as the scale formed on the body (710) of the drug cartridge (700), so that the amount of drug injected can be checked even if the scale cannot be visually checked while inserted inside the main body (100).

[0025] Then, the second body (120) is disassembled from the first body (110), a drug cartridge (700) is inserted, and the second body (120) is reassembled into the first body (110).

[0026] The body top (130) is formed with a through hole in the interior, and a spiral projection (132) is formed on the lower outer surface to be spirally connected to a spiral groove (114) formed on the upper inner surface of the first body (110), and a groove (134) is formed on the upper outer surface, and a clip (136) is attached to the groove (134) to be fastened to a pocket of clothing, etc.

[0027] And the body top (130) has a piston rod holder (400) fixed inside.

[0028] A protective cap (740) is attached to the inside of the tip (140) which is formed through, and a spiral groove (142) is formed on the upper side of the inner surface so as to be spirally fastened to a spiral projection (122) formed on the lower side of the outer surface of the second body (120).

[0029] Here, the tip (140) can adjust the withdrawal length of the injection needle (730) of the drug cartridge (700) according to the degree of connection with the lower outer surface of the second body (120).

[0030] That is, if the tip (140) is connected to the lower outer surface of the second body (120) to a greater degree, the withdrawal length of the injection needle (730) becomes longer, and if the connection to the lower outer surface of the second body (120) is less, the withdrawal length of the injection needle (730) becomes shorter.

[0031] For example, the tip (140) can be adjusted in length between approximately 4 and 8 mm by the scale (128).

[0032] The leveler (150) functions to level the tip (140), has a through-hole formed inside, and has a spiral groove (152) partially formed on the lower inner surface to be spirally connected to a spiral projection (122) formed on the lower outer surface of the second body (120).

[0033] At this time, when the leveler (150) is rotated and moved to a position where its lower part is in close contact with the upper part of the tip (140) so as to check the amount of drug injected from the drug cartridge (700), the scale (128) indicated by the upper part becomes the amount of drug injected.

[0034] Furthermore, the leveler (150) also has the function of moving its lower portion to a position where it is in close contact with the upper portion of the tip (140) to lock the tip (140) so that it cannot rotate.

[0035] Additionally, the leveler (150) has a groove (1520) formed at the lower part of the spiral groove (152), and a guide projection (7444) formed radially on the upper part of the outer surface of the lower cap (744) of the protective cap (740) is connected to the groove (1520), so that the protective cap (740) moves up and down.

[0036] That is, when the leveler (150) is rotated to rise, the protective cap (740) also rises, and when the leveler (150) is rotated to lower, the protective cap (740) also lowers.

[0037] In this way, the tip (140) and leveler (150) can be operated to adjust the volume of the injection solution to, for example, between 0.5cc and 1cc.

[0038] As shown in FIGS. 1 to 6, the piston rod trigger (200) is provided inside the body top (130) of the main body part (100) and unlocks the state so that the elastically supported piston rod (300) moves toward the drug cartridge (700) by means of elastic force when operated.

[0039] At this time, when the user applies pressure to the piston rod trigger (200), the guide shaft (202) provided at the lower center is coupled within the groove (3110) formed on the upper part of the piston rod (300), and as it descends, pressure is applied so that the locking projection (312) of the piston rod (300) is separated from the binding projection (410) of the piston rod holder (400).

[0040] And the piston rod trigger (200) functions as a one-touch button so that its upper end protrudes in the upper direction of the body top (130) and can be pressed by the user, and the maximum extension distance is limited as the projection (204) formed on the lower outer surface catches on the upper inner surface of the body top (130).

[0041] Furthermore, the piston rod trigger (200) is provided with a trigger spring (210) between the jaw (204) and the upper part of the piston rod holder (400) facing it, so that when the pressure is removed after being pressed, it rises back to its original position by the restoring force of the trigger spring (210).

[0042] As shown in FIGS. 1 and 5, the piston rod (300) moves along the inside of the first and second bodies (110, 120) to provide pressure to spray the drug stored inside the drug cartridge (700), and includes a piston rod body (310) and a pressure port (320).

[0043] The piston rod body (310) pressurizes the annular sealing material (720) of the drug cartridge (700) to discharge the drug stored inside the drug cartridge (700), and a groove (3110) is formed indented so that the guide shaft (202) of the piston rod trigger (200) is coupled thereto, a locking projection (312) is formed protruding along the outer surface at the center of the outer surface, a screw groove (314) is formed on the outer surface from the locking projection (312) to the bottom, and a spiral projection is formed at the bottom to be spirally coupled with the spiral hole of the pressure member (320).

[0044] Here, the screw groove (314) is spirally coupled to the screw projection (510) formed on the inner circumference of the piston rod holder (400), so that the piston rod (300) rotates when the piston rod (300) descends.

[0045] That is, when the piston rod trigger (200) is pressed, the guide shaft (202) lowers the piston rod (300), and then the lowered locking projection (312) separates from the binding projection (410) of the piston rod holder (400), and as the elastic part (600) in the compressed state is restored, the screw groove (314) of the piston rod (300) rotates along the screw projection (510) of the piston rod holder (400) and lowers.

[0046] The pressure member (320) is connected to a spiral projection formed at the bottom of the piston rod body (310) and pressurizes the sealing material (720) of the drug cartridge (700).

[0047] As shown in FIGS. 1 and 5, the piston rod holder (400) is fixed inside the body top (130), and the interior is formed through, so that the locking projection (312) of the piston rod (300) remains in a locked state with the binding projection (410) provided at the end, and then detaches from the binding projection (410) when the piston rod trigger (200) is pressed.

[0048] At this time, the binding projection (410) is formed on the inner surface protruding between the radial grooves so that it can be opened when the locking projection (312) is pressed.

[0049] As shown in FIGS. 1 and 5, the piston rod guide (500) is coupled to one end of the piston rod (300) and guides the piston rod (300) to rotate when the piston rod trigger (200) is operated, and a screw projection (510) is formed on the lower end of the penetrating inner surface.

[0050] At this time, the screw projection (510) engages with the screw groove (314) of the piston rod body (310) and guides the direction of rotation so that the piston rod body (310) rotates when the piston rod body (310) descends.

[0051] As shown in FIGS. 1, 5 and 6, the elastic part (600) is supported at both ends between the inner ceiling of the piston rod holder (400) and the locking projection (312) of the piston rod body (310) facing it.

[0052] That is, the elastic part (60) maintains a compressed state until the lower end of the piston rod body (310) presses the sealing material (720) of the drug cartridge (700), and when the upper end of the piston rod trigger (200) is pressed, the locking projection (312) of the piston rod body (310) separates from the binding projection (410) of the piston rod holder (400), and a restoring force is applied to press the sealing material (720) of the drug cartridge (700) while simultaneously rotating and lowering the piston rod (300).

[0053] As shown in FIGS. 1, 3, 5, 7 and 8, the drug cartridge (700) stores a drug inside and includes a body (710), a sealing material (720), an injection needle (730) and a protective cap (740).

[0054] The body (710) has a scale formed to indicate the amount of drug stored, and the top is formed with an opening.

[0055] The sealing material (720) is provided inside the body (710) and moves to discharge the drug stored inside the body (710) by the movement of the piston rod (300) while maintaining airtightness so that the drug stored inside the body (710) does not leak.

[0056] The injection needle (730) is connected to the bottom of the body (710) and inserted into the body so that the drug is injected.

[0057] As shown in FIGS. 9 and 10, the protective cap (740) is supplied in a state of being integrally coupled to the lower part of the body (710) to surround the injection needle (730), and is replaced while fixed to the lower part of the body (710) when the drug cartridge (700) is replaced.

[0058] At this time, the protective cap (740) includes an upper cap (742), a lower cap (744), and a cap spring (746).

[0059] The upper cap (742) has a connecting groove (7420) formed so that the lower part of the body (710) is connected, and a plurality of first protrusions (7422) are formed protruding along the stepped lower outer surface.

[0060] At this time, the coupling groove (7420) has a groove formed on its inner surface so that it can be firmly coupled to the body (710) of the drug cartridge (700).

[0061] The lower cap (744) is formed in a recessed shape to be coupled to the lower part of the upper cap (742), and the withdrawal distance of the injection needle (730) is adjusted according to the movement distance of the upper cap (742), and a second jaw (7440) is formed protruding along the upper inner surface, and an incision groove (7442) is formed radially along the upper side.

[0062] At this time, the cut groove (7442) causes the second jaw (7440) to open when the first jaw (7422) of the upper cap (742) is joined to the second jaw (7440) of the lower cap (744), and after joining, an elastic force is applied to prevent separation of the upper cap (742) and the lower cap (744).

[0063] Furthermore, since the lower cap (744) has a radially formed cut groove (7442), the second jaw (7440) moves by breaking through the first jaw (7422) of the upper cap (742) by the force of the piston rod (300).

[0064] That is, if the gap between the lower cap (744) and the upper cap (742) is wide as the upper cap (742) descends, the withdrawal distance of the injection needle (730) is short, and if the gap between the lower cap (744) and the upper cap (742) descends is narrow, the withdrawal distance of the injection needle (730) is long.

[0065] And when the first jaw (7422) of the upper cap (742) and the second jaw (7440) of the lower cap (744) are joined together, the maximum withdrawal distance of the upper cap (742) and the lower cap (744) is limited.

[0066] And the bottom cap (744) has a radial guide projection (7444) formed on its upper outer surface and is coupled to a groove (1520) formed on the lower inner surface of the leveler (150).

[0067] In this way, since the protective cap (740), including the bottom cap (744), is supported by the leveler (150), the entire protective cap (740) moves in conjunction with the bottom cap (744) when the leveler (150) moves up and down.

[0068] The cap spring (746) is supported at both ends by the inside of the upper cap (742) and the inner bottom of the lower cap (744), so that it is compressed when the upper cap (742) is lowered and restored when the upper cap (742) is raised.

[0069] In this way, when the upper cap (742) moves toward the lower cap (744) by the cap spring (746), the injection needle (730) is exposed, and when use is finished, the injection needle (730) is retracted again by the restoring force.

[0070] And the first jaw (7422) of the upper cap (742) is forcibly separated from the second jaw (7440) of the lower cap (744) by the restoring force of the cap spring (746).

[0071] The operation process of the large-capacity automatic syringe (10) according to the present invention is described as follows.

[0072] First, with the drug cartridge (700) before use mounted inside the main body (100), the lower part of the tip (140) is brought into contact with the skin for drug injection. Then, when the user presses the piston rod trigger (200) exposed to the upper part of the body top (130) in a one-touch manner, the guide shaft (202) of the piston rod trigger (200) lowers the piston rod (300), which is elastically supported by the elastic part (600), so that the locking projection (312) of the piston rod (300) is separated from the binding projection (410) of the piston rod holder (400).

[0073] Next, the restoring force of the elastic part (600) is applied to the piston rod (300), causing the piston rod (300) to descend, and the screw groove (314) of the piston rod (300) descends along the screw projection (510) of the piston rod holder (400) with rotation. Consequently, the upper cap (742) fixed to the lower part of the body (710) begins to descend along the lower cap (744) until the step of the upper cap (742) touches the upper outer surface of the lower cap (744). At this time, the drug cartridge (700) also descends.

[0074] In this way, as the piston rod (300) descends toward the piston rod holder (400), the rotational motion is converted into linear motion, and the speed at which the sealing material (720) of the drug cartridge (700) is pressed is controlled, thereby allowing the injection speed to be controlled slowly. This is because if the piston rod (300) presses the sealing material (720) of the drug cartridge (700) by linear motion and the drug is injected too forcefully, the human skin may suffer physical damage. Ultimately, since the piston rod (300) rotates in a screw manner and pushes the injection fluid, it is possible to inject the injection fluid slowly.

[0075] Next, when the height of the upper cap (742) and the lower cap (744) is lowered to the maximum by the lowering of the upper cap (742), the lowering of the drug cartridge (700) is stopped, and the pressure member (320) coupled to the lower part of the piston rod body (310) lowers the sealing material (720) located on the upper side of the body (710) of the drug cartridge (700).

[0076] Next, the injection needle (730) exposed on the lower side of the tip (140) penetrates the skin and is inserted into the body, simultaneously injecting the drug inside the body (710).

[0077] Next, after injecting the drug, the upper cap (742) is pressed upward by the restoring force of the cap spring (746), which has both ends supported on the inside of the upper cap (742) and the inner bottom of the lower cap (744), thereby concealing the injection needle (730) inside the upper cap (742) and the lower cap (744).

[0078] Meanwhile, when replacement of the drug cartridge (700) is required, the second body (120) is separated from the first body (110), and the body (710) of the drug cartridge (700) from which the drug has been depleted is separated from the lower part of the piston rod body (310), and then replaced with a drug cartridge (700) equipped with a protective cap (740). In this case, the injection needle (730) is protected by the protective cap (740), thereby preventing damage to the injection needle (730). After that, the second body (120) is rotated to reattach it to the first body (110) and then used again.

[0079] Furthermore, when adjustment of the withdrawal length of the injection needle (730) is required due to the thickness of the skin or the control of the drug withdrawal amount, the tip (140) is rotated in the opposite direction of the second body (120) to separate the upper part of the tip (140) from the lower part of the leveler (150), and then the leveler (150) is rotated toward the tip (140). This causes the protective cap (740) to be linked to the leveler (150) and its position adjusted, after which the lower part of the leveler (150) is brought into close contact with the upper part of the tip (140).

[0080] At this time, the upper part of the leveler (150) points to the scale (128) marked on the step (126) of the second body (120), and the injection needle (730) is withdrawn by the corresponding scale (128).

[0081] Furthermore, when the withdrawal length of the injection needle (730) is adjusted, the length to which the piston rod body (310) presses the sealing material (720) of the drug cartridge (700) is also proportional, so the supply amount (administration amount) of the drug discharged through the injection needle (730) can also be adjusted.

[0082] Thus, the large-capacity automatic syringe (10) of the present invention can be used by fixing a drug cartridge (700), which has a protective cap (740) attached to the injection needle (730) portion, to the second body (120) without removing the protective cap (740), and can be used by disassembling the second body (120) from the first body (110) to insert the drug cartridge (700) and fixing the second body (120) again, and can adjust the volume of the injection solution between 0.5cc and 1cc by operating the tip (140) and the leveler (150) to adjust the withdrawal length of the injection needle (730), and when the protective cap (740) attached to the injection needle (730) portion is in use, the lower cap (744) moves toward the upper cap (742) to expose the injection needle (730), and when use is finished, the injection needle (730) is concealed again so that it can be used safely, and the protective cap (740) is upper It is composed of a cap (742), a lower cap (744), and a cap spring (746), and the lower cap (744) is supported by the protruding part of the lower cap (742) and the cap spring (746), and the lower cap (744) has a part that connects with the upper cap (742) divided into four parts, so that it moves by breaking through the first jaw (7422) of the upper cap (742) by the piston force of the piston rod (300), and has a piston structure that is fired by a one-touch button by the piston rod trigger (200), and when the piston rod (300) fires the drug cartridge (700) fixed to the front end of the tip (140), the sealing material (720) of the drug cartridge (700) advances, and the protective cap (740) is compressed, exposing the injection needle (730).

[0083] The configurations included in the various embodiments described above may also be implemented in various other possible modified combinations not exemplarily described above, provided that such combinations are not clearly excluded from one another in terms of implementation. Explanation of the symbols

[0084] 10: High-capacity automatic syringe 100: Main body 110: First body 120: Second body 130: Body Top 140: Tips 150: Leveler 200: Piston Rod Trigger 210: Trigger Spring 300: Piston rod 310: Piston rod body 320: Pressure port 400: Piston rod holder 410: Binding projection 500: Piston rod guide 510: Screw protrusion 600: Elastic part 700: Drug cartridge 710: Body 720: Sealing material 730: Syringe needle 740: Protective cap 742: Top cap 744: Bottom cap 746: Cap spring

Claims

Claim 1 A high-capacity automatic syringe characterized by comprising: a main body portion to which a drug cartridge is coupled on one side of the interior; a piston rod that provides a pressurizing force to spray a drug stored inside the drug cartridge while rotating along the interior of the main body portion; a piston rod trigger provided on the other side of the interior of the main body portion to unlock a state so that the elastically supported piston rod moves toward the drug cartridge by means of elastic force when operated; and a piston rod guide that guides the piston rod to rotate when the piston rod trigger is operated while coupled to one end of the piston rod. Claim 2 A large-capacity automatic syringe according to claim 1, further comprising a protective cap which is coupled to surround the injection needle of the drug cartridge while positioned inside the main body, and which adjusts the withdrawal distance of the injection needle as the upper portion, divided by the downward distance of the piston rod, moves downward while in an upper and lower divided state. Claim 3 In paragraph 2, the main body comprises: a first body; a second body having one end spirally connected to one end of the first body and having a spiral projection formed on one end; a body top having a clip connected to the other end of the first body and having a clip attached; a tip having a protective cap located inside and spirally connected to a spiral projection formed on one end of the second body, with its length adjustable according to the amount of connection; and a leveler having a scale formed on the outer surface of the end of the second body to which the tip is spirally connected, corresponding to the scale of a drug cartridge, such that when the position of the tip is adjusted, one end comes into close contact with the other end of the tip while the other end indicates the position of the scale. Claim 4 A large-capacity automatic syringe according to paragraph 3, wherein the leveler is characterized by a guide projection formed on the outer surface of the lower cap of the protective cap being coupled to a groove formed along the inner surface, and the protective cap moves in conjunction with the leveler as it moves. Claim 5 A large-capacity automatic syringe according to claim 1, wherein the piston rod has a stopper formed thereon to support one end of an elastic part located between the ends of the main body part in the middle, and a screw groove is formed on the outer surface of one end so that the screw groove is coupled to a screw projection formed on the inner surface of the piston rod guide and rotates when moving. Claim 6 A large-capacity automatic syringe according to claim 1, further comprising a piston rod holder positioned inside the main body portion, wherein the locking projection of the piston rod is engaged with a binding projection provided at the end portion and detaches from the binding projection when the piston rod trigger is pressed. Claim 7 A large-capacity automatic syringe according to paragraph 2, wherein the protective cap comprises: an upper cap in which the injection needle is positioned inside and the end of the drug cartridge is coupled; a lower cap coupled to the lower part of the upper cap, having a radial guide projection formed on the upper outer surface and adjusting the withdrawal distance of the injection needle according to the movement distance of the upper cap; and a cap spring in which both ends are supported inside the upper and lower caps, which is compressed when the upper cap descends and restored when the upper cap ascends. Claim 8 A high-capacity automatic syringe according to claim 1, characterized in that the piston rod trigger is supported by a trigger spring and moves to its original position when pressure is released.

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