Automatic injector with drug injection dosage control function

Abstract

The present invention comprises: a main body having a drug cartridge coupled to one inner side; a piston rod that moves along the inside of the main body and exerts a pressing force to spray the drug stored inside the drug cartridge; a piston rod holder that is provided on the other inner side of the main body and maintains a locked state so that, when operated, the elastically supported piston rod moves toward the drug cartridge by means of the elastic force; and a protective cap which is coupled to surround an injection needle of the drug cartridge, and in which the withdrawal distance of the injection needle is adjusted according to an interval corresponding to the distance of descent of the piston rod while the protective cap is in a divided state. The supply of the drug can be visually checked, and thus the injected amount of the drug can be determined. The degree of exposure of the injection needle is adjusted according to the compression length of upper and lower caps, and thus the needle can be used in a manner appropriate for the thickness of the skin. Furthermore, the supply of the drug can be proportionally adjusted according to the degree of exposure of the injection needle. Therefore, the present invention has the effect of supplying an accurate amount of the drug.

Description

Automatic syringe equipped with dosage control function

[0001] The present invention relates to an automatic injector with a drug injection dose control function, and more specifically, to a pen-type syringe that is portable and automatically injects drugs subcutaneously.

[0002] Generally, pen-type syringes are conveniently carried and used when regular, precise doses of medication are required, such as for insulin administration.

[0003] These pen-type syringes were primarily designed for the convenience of users who need to inject themselves frequently, such as diabetic patients.

[0004] In particular, the pen-type syringe contains enough medication for several to dozens of injections, and is configured so that even general patients can self-administer an amount of medication by pressing.

[0005] Technology related to such a pen-type automatic syringe has been proposed in Korean Registered Patent No. 0977283.

[0006] However, Patent Document 1 had a problem in which, during the process of inserting the drug cartridge into the body part for replacement due to depletion of the drug, the injection needle got tangled in the gap of the first spring and bent, so the drug could not be properly supplied.

[0007] [Prior Art Literature]

[0008] [Patent Literature]

[0009] (Patent Document 1) Korean Registered Patent No. 0977283 (August 16, 2010)

[0010] The present invention has been devised in consideration of the above points, and the objective of the present invention is to provide an automatic syringe equipped with a dosage control function that allows the drug cartridge to be replaced while the needle is attached with a protective cap, thereby protecting the needle and preventing the needle from bending during the process of mounting it within the main body.

[0011] An automatic syringe (100) equipped with a dosage control function according to the present invention for achieving the above objective may be characterized by comprising: a main body (100) to which a drug cartridge (500) is coupled to one side of the interior; a piston rod (300) that moves along the interior of the main body (100) and provides a pressurizing force to spray the drug stored inside the drug cartridge (500); a piston rod holder (200) provided on the other side of the interior of the main body (100) and which unlocks a locked state so that the elastically supported piston rod (300) moves toward the drug cartridge (500) by means of elastic force when operated; and a protective cap (540) coupled to surround the injection needle (530) of the drug cartridge (500), and which controls the withdrawal distance of the injection needle (530) by moving the upper part, which is divided by the downward distance of the piston rod (300), to the lower part while in an upper and lower divided state.

[0012] The above main body (100) may be characterized by comprising: a first body (110) having a through hole (114) formed on the outer end so that a push button (222) of the piston rod holder (200) passes through; a second body (120) having one end spirally fastened to the other end of the first body (110) and a spiral projection formed on the other end; a body top (130) having a clip (136) coupled to a spirally fastened to the other end of the first body (110); and a tip (150) having a length adjusted according to the amount of fastening, which is spirally fastened to the spiral projection at the other end of the second body (120).

[0013] The above tip (150) may be spirally connected to the outer surface of the other end of the second body (120), and a scale (126) corresponding to the scale of the drug cartridge (500) is formed on the outer surface of the other end of the second body (120), and the device may further include a leveler (160) in which, when adjusting the position of the tip (150), one end is in close contact with the other end of the tip (150) and the other end indicates the position of the scale (126).

[0014] The above piston rod (300) may be characterized by having a stopper projection (312) formed thereon to support one end of an elastic part (400) located between the ends of the main body part (100) in the middle.

[0015] The above piston rod holder (200) may be characterized by comprising: a support (210) which is coupled to the interior of the main body (100) and has a hole (212) formed in an orthogonal direction on one side; a locking piece (220) which is rotatably coupled to the hole (212) by an axis (228), has a locking projection (224) formed at one end to lock or unlock the locking projection (312) of the piston rod (300), and a push button (222) formed at the other end; and a spring (230) which is provided on the opposite surface of the support (210) and the other end of the locking piece (220), and is compressed when the push button (222) of the locking piece (220) is pressed, and is provided to have a restoring force when the push button (222) is released.

[0016] The protective cap (540) may be characterized by including: an upper cap (542) in which the injection needle (530) is positioned inside while the end of the drug cartridge (500) is coupled; a lower cap (544) in which the injection needle (530) is positioned inside while coupled to the lower part of the upper cap (542), and which adjusts the withdrawal distance of the injection needle (530) according to the movement distance of the upper cap (542); and a cap spring (546) in which both ends are supported inside the upper and lower caps (542, 544), which is compressed when the upper cap (542) descends and restored when the upper cap (542) rises.

[0017] The upper and lower caps (542, 544) may be characterized by having their maximum withdrawal distance limited by the jaws (5422, 5440).

[0018] The lower cap (544) may be characterized by having a radial groove formed at the top so that it can open when combined with the upper cap (524).

[0019] In addition, the present invention may be characterized by comprising: a main body portion to which a drug cartridge is coupled on one side of the interior; a piston rod that moves along the interior of the main body portion and provides a pressurizing force to spray a drug stored inside the drug cartridge; a piston rod holder provided on the other side of the interior of the main body portion to unlock the state so that the elastically supported piston rod moves toward the drug cartridge by means of elastic force upon operation; and a protective cap coupled to surround the injection needle of the drug cartridge, wherein the upper portion divided by the downward distance of the piston rod moves to the lower portion to adjust the withdrawal distance of the injection needle, wherein the main body portion comprises: a first body having a through hole formed at the other end of the outer surface to allow a push button of the piston rod holder to pass through; a second body having one end spirally connected to the other end of the first body and a spiral projection formed at the other end; a body top connected spirally to the other end of the first body and to which a clip is coupled; and a tip connected spirally to the spiral projection at the other end of the second body, the length of which is adjusted according to the amount of connection.

[0020] In addition, the present invention comprises: a main body portion to which a drug cartridge is coupled on one side of the interior; a piston rod that moves along the interior of the main body portion and provides a pressurizing force to spray a drug stored inside the drug cartridge; a piston rod holder 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 an elastic force upon operation; and a protective cap coupled to surround the injection needle of the drug cartridge, wherein the upper portion divided by the downward distance of the piston rod moves to the lower portion to adjust the withdrawal distance of the injection needle in an upper and lower divided state; wherein the piston rod holder comprises: a support coupled to the interior of the main body portion and having a hole formed in an orthogonal direction on one side; and a locking piece rotatably coupled to the hole by an axis, having a locking projection formed at one end for engaging or disengaging a locking projection of the piston rod, and a push button formed at the other end. and a spring provided on the opposite surface of the other end of the locking piece and the support, which is compressed when the push button of the locking piece is pressed and is configured to provide a restoring force when the push button is released.

[0021] According to the present invention, since the drug cartridge is replaced while the protective cap is attached to the injection needle, the injection needle can be protected and the bending phenomenon can be prevented. In addition, the piston rod descends by a one-touch method to spray the drug stored inside the drug cartridge, and when use is finished, the injection needle is retracted by elastic force, making it safe. Furthermore, although the drug cartridge is inserted into the main body, the amount of drug supplied can be visually checked through the scale formed in the main body, allowing the amount of drug injected to be recognized. Additionally, the degree of exposure of the injection needle is adjusted according to the compression length of the upper and lower caps, allowing it to be used according to the thickness of the skin, and the amount of drug supplied can be adjusted proportionally according to the degree of exposure of the injection needle, thereby providing the effect of supplying an accurate amount of drug.

[0022] FIG. 1 is an exploded perspective view illustrating an automatic syringe equipped with a dosage control function according to the present invention.

[0023] FIG. 2 is a perspective view illustrating an automatic syringe equipped with a dosage control function according to the present invention.

[0024] FIG. 3 is a perspective view illustrating the state in which the second body is separated and the state in which the drug cartridge is connected in the state in which the second body is separated in an automatic syringe equipped with a dosage control function of the present invention.

[0025] FIG. 4 is a front view showing the withdrawal length of the injection needle according to the position of the tip in an automatic syringe equipped with a dosage control function of the present invention.

[0026] FIG. 5 is a cross-sectional view showing the withdrawal length of the injection needle according to the position of the tip in an automatic syringe equipped with a dosage control function of the present invention.

[0027] FIG. 6 is a cross-sectional view showing the state before and after operation of the piston rod holder in an automatic syringe equipped with a dosage control function according to the present invention.

[0028] FIG. 7 is an exploded perspective view showing a piston rod holder in an automatic syringe equipped with a dosage control function according to the present invention, and a side view showing the state before and after operation.

[0029] FIG. 8 is an exploded perspective view and an assembled perspective view showing a drug cartridge and a protective cap in an automatic syringe equipped with a dosage control function according to the present invention.

[0030] FIG. 9 is a cross-sectional view showing a protective cap in an automatic syringe equipped with a dosage control function according to the present invention.

[0031] The above-mentioned objectives, 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, an automatic syringe equipped with a dosage control function according to an embodiment of the present invention will be described in detail with reference to the attached drawings.

[0032] 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 moves along the interior of the main body portion and provides a pressurizing force to spray a drug stored inside the drug cartridge; a piston rod holder provided on the other side of the interior of the main body portion and maintaining a locked state so that the elastically supported piston rod moves toward the drug cartridge by means of an elastic force when operated; and a protective cap coupled to surround the injection needle of the drug cartridge and adjusting the withdrawal distance of the injection needle according to a gap corresponding to the downward distance of the piston rod in a divided state. According to the present invention, since the drug cartridge is replaced while the protective cap is attached to the injection needle, the injection needle can be protected and the bending phenomenon can be prevented. In addition, the piston rod descends by a one-touch method to spray the drug stored inside the drug cartridge, and when use is finished, the injection needle is retracted by elastic force, making it safe. Furthermore, although the drug cartridge is inserted into the main body, the amount of drug supplied can be visually checked through the scale formed in the main body, allowing the amount of drug injected to be recognized. Additionally, the degree of exposure of the injection needle is adjusted according to the compression length of the upper and lower caps, allowing it to be used according to the thickness of the skin, and the amount of drug supplied can be adjusted proportionally according to the degree of exposure of the injection needle, thereby providing the effect of supplying an accurate amount of drug.

[0033] Referring to FIGS. 1 to 9, an automatic syringe (10) having a dosage control function according to an embodiment of the present invention comprises a main body (100), a piston rod holder (200), a piston rod (300), an elastic part (400), and a drug cartridge (500), and is a device equipped in a pen type that can control the dosage of a drug stored in the drug cartridge (500).

[0034] As shown in FIGS. 1 to 6, the main body (100) has a piston rod holder (200), a piston rod (300), an elastic part (400), and a drug cartridge (500) located inside, and includes a first body (110), a second body (120), a body top (130), a holder lock (140), a tip (150), and a leveler (160).

[0035] The first body (110) is formed with a through hole in the interior, 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). A through hole (114) is formed in an orthogonal direction so that a push button (222) formed on a locking piece (220) of a piston rod holder (200) can pass through it on the upper outer surface, and a spiral groove (116) 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).

[0036] 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 coupled with a spiral groove (152) formed on the upper inner surface of the tip (150), and a spiral groove (124) is formed on the upper inner surface to be spirally coupled with a spiral projection (112) formed on the lower outer surface of the first body (110), and a scale (126) is marked on a step (125) formed on the outer surface adjacent to the spiral projection (122).

[0037] At this time, the scale (126) is marked with the same spacing as the scale formed on the body (510) of the drug cartridge (500) and inserted into the interior of the main body (100), so that the injection amount can be checked even if the scale cannot be visually confirmed.

[0038] The body top (130) is formed with a structure in which the lower part is open and the upper part is closed, and a spiral projection (132) is formed on the lower part of the outer surface to be spirally connected to a spiral groove (116) formed on the upper part of the inner surface of the first body (110), and a groove (134) is formed on the upper part of the outer surface, and a clip (136) is connected to the groove (134) to press the push button (222) of the piston rod holder (200) by the user, and a guide shaft (138) is formed to protrude along the inner center and is connected to the coupling groove (316) of the piston rod (300) to guide the direction of movement of the piston rod (300), and is extended in the longitudinal direction.

[0039] The holder lock (140) has a through-hole formed inside and has a spiral projection (142) formed on its outer surface to be spirally fastened to the spiral groove (116) of the first body (110), and functions to fix the upper end of the piston rod holder (200) when fastened.

[0040] A protective cap (540) is attached to the inside of the tip (150) which is formed through, and a spiral groove (152) 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).

[0041] Here, the tip (150) can adjust the withdrawal length of the injection needle (530) of the drug cartridge (500) according to the degree of connection with the lower outer surface of the second body (120).

[0042] That is, if the degree of connection between the tip (150) and the lower outer surface of the second body (120) is large, the withdrawal length of the injection needle (530) becomes long, and if the degree of connection between the tip (150) and the lower outer surface of the second body (120) is small, the withdrawal length of the injection needle (530) becomes short.

[0043] For example, the tip (150) can be adjusted between 4 and 8 mm by the scale (126).

[0044] The leveler (160) has a through-hole formed inside, and a spiral groove (162) is formed on the lower part of the inner surface to be spirally fastened to a spiral projection (122) formed on the lower part of the outer surface of the second body (120).

[0045] At this time, when the leveler (160) is rotated and moved to a position where its lower part is in close contact with the upper part of the tip (150) so as to check the amount of drug injected from the drug cartridge (500), the scale (126) indicated by the upper part becomes the amount of drug injected.

[0046] Furthermore, the leveler (160) 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 (150) to lock the tip (150) so that it cannot rotate.

[0047] As shown in FIGS. 1, 5 to 7, the piston rod holder (200) is coupled to the upper interior of the first body (110) and maintains or unlocks the locked state so that the elastically supported piston rod (300) moves toward the drug cartridge (500) by elastic force when operated, and includes a support (210), a locking piece (220), and a spring (230).

[0048] The support (210) has a lower outer surface that engages with a step formed on the inner surface of the first body (110), and has a through-hole formed to allow the piston rod (300) to move. A hole (212) is formed in an orthogonal direction so that a catch (220) is rotatably supported by an axis (228) on one side of the outer surface, and a support groove (214) is formed on one side of the upper outer surface to support one end of a spring (230).

[0049] Furthermore, the support (210) has a corresponding step formed at the bottom of the inner surface to limit the movement position as the locking projection (312) of the piston rod (300) is coupled thereto.

[0050] The locking piece (220) is rotatably coupled to the hole (212) of the support (210) by means of an axis (228), and a locking projection (224) is formed at the lower end to lock or unlock the locking projection (312) of the piston rod (300), and a push button (222) is formed at the upper end so that the end can be pressed when the clip (136) is pressed.

[0051] At this time, the push button (222) is exposed to the outside through the through hole (114) of the first body (110) and is pressed when the tip of the clip (136) is pressed.

[0052] And the push button (222) has a space formed inside to support the other end of the spring (230).

[0053] The spring (230) is positioned between the bottom surface of the push button (222) and the support groove (214) of the support (210) and is compressed when the push button (222) is pressed, and is provided to act as a locking piece (220) while acting as a restoring force when the push button (222) is released.

[0054] That is, the spring (230) causes the connecting projection (224) of the locking piece (220) to be separated from the locking projection (312) of the piston rod (300) when compressed, and the connecting projection (224) of the locking piece (220) to be connected to the locking projection (312) of the piston rod (300) when restored.

[0055] As shown in FIGS. 1, 5 and 6, 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 (500), and includes a piston rod body (310), a pressure member (320), and a support member (330).

[0056] The piston rod body (310) pressurizes the sealing material (520) of the drug cartridge (500) to discharge the drug stored inside the drug cartridge (500), and a locking projection (312) is formed protruding along the outer surface at the center of the outer surface, a spiral projection (314) is formed at the bottom to be spirally connected with the spiral hole of the pressure member (320), and a coupling groove (316) is formed in the longitudinal direction so that a guide shaft (138) is coupled from the top to the center position.

[0057] The pressure member (320) is connected to the spiral projection (314) of the piston rod body (310) and pressurizes the sealing material (520) of the drug cartridge (500).

[0058] The support member (330) is positioned so that the lower end of the piston rod body (310) penetrates it, and is joined to the upper inner surface of the second body (120) by a step.

[0059] As shown in FIGS. 1, 5 and 6, the elastic part (400) is supported at both ends between the guide shaft (138) and the locking projection (312) of the piston rod body (310).

[0060] That is, the elastic part (400) maintains a compressed state until the lower end of the piston rod body (310) presses the sealing material (520) of the drug cartridge (500), and when the push button (222) of the piston rod holder (200) is pressed, the binding projection (224) separates from the locking projection (312) of the piston rod body (310) in the elastic state, causing the piston rod holder (200) to descend and a restoring force to be applied to press the sealing material (520) of the drug cartridge (500).

[0061] As shown in FIGS. 1, FIGS. 3, FIGS. 5, FIGS. 8 and FIGS. 9, the drug cartridge (500) stores a drug inside and includes a body (510), a sealing material (520), an injection needle (530) and a protective cap (540).

[0062] The body (510) has a scale formed to indicate the amount of drug stored, and the top is formed with an opening.

[0063] The sealing material (520) is provided inside the body (510) and moves to discharge the drug stored in the body (510) by the movement of the piston rod (300) while maintaining airtightness so that the drug stored in the body (510) does not leak.

[0064] The injection needle (530) is connected to the bottom of the body (510) and inserted into the body so that the drug is injected.

[0065] The protective cap (540) is supplied in a state of being integrally combined to wrap the injection needle (530) at the bottom of the body (510), and is replaced while fixed to the bottom of the body (510) when the drug cartridge (500) is replaced.

[0066] At this time, the protective cap (540) includes an upper cap (542), a lower cap (544), and a cap spring (546).

[0067] The upper cap (542) has a connecting groove (5420) formed so that the lower part of the body (510) is connected, and a plurality of first protrusions (5422) are formed protruding along the stepped lower outer surface.

[0068] At this time, the coupling groove (5420) has a groove formed on its inner surface so that it can be firmly coupled to the body (510) of the drug cartridge (500).

[0069] The lower cap (544) is formed in a recessed shape to be coupled to the lower part of the upper cap (542), and the withdrawal distance of the injection needle (530) is adjusted according to the movement distance of the upper cap (542), and a second jaw (5440) is formed protruding along the upper inner surface, and an incision groove (5442) is formed radially along the upper side.

[0070] At this time, the cut groove (5442) causes the second jaw (5440) to open when the first jaw (5422) of the upper cap (542) is joined to the second jaw (5440) of the lower cap (544), and after joining, causes an elastic force to act to prevent separation of the upper cap (542) and the lower cap (544).

[0071] Furthermore, since the lower cap (544) has a radially formed cut groove (5442), the second jaw (5440) moves by breaking through the first jaw (5422) of the upper cap (542) by the force of the piston rod (300).

[0072] That is, if the gap between the upper cap (542) and the lower cap (544) is large due to the lowering of the upper cap (542), the withdrawal distance of the injection needle (530) is short, and if the gap between the upper cap (542) and the lower cap (544) is small due to the lowering of the upper cap (542), the withdrawal distance of the injection needle (530) is long.

[0073] And when the first jaw (5422) of the upper cap (542) and the second jaw (5440) of the lower cap (544) are joined together, the maximum withdrawal distance of the upper cap (542) and the lower cap (544) is limited.

[0074] The cap spring (546) is supported at both ends by the inside of the upper cap (542) and the inner bottom of the lower cap (544), so that it is compressed when the upper cap (542) is lowered and restored when the upper cap (542) is raised.

[0075] In this way, when the upper cap (542) moves toward the lower cap (544) by the cap spring (546), the injection needle (530) is exposed, and when use is finished, the injection needle (530) is retracted again as a restoring force is applied.

[0076] And the first jaw (5422) of the upper cap (542) is forcibly separated from the second jaw (5440) of the lower cap (544) by the restoring force of the cap spring (546).

[0077] The operation process of the automatic syringe (10) equipped with a dosage control function according to the present invention is described as follows.

[0078] First, when a drug cartridge (500) before use is mounted inside the main body (100) and the lower part of the tip (150) is in contact with the skin for drug injection, and the user presses the push button (222) formed on the locking piece (220) of the piston rod holder (200) in a one-touch manner, the locking piece (220) is rotated by the shaft (228), and the binding projection (224) is lifted and separated from the locking projection (312) of the piston rod (300) which is elastically supported by the compressed elastic part (400).

[0079] Next, as the restoring force of the elastic part (400) is applied to the piston rod (300), the piston rod (300) is lowered, causing the upper cap (542), which is fixed to the lower part of the body (510), to begin descending along the lower cap (544) until the step of the upper cap (542) touches the upper outer surface of the lower cap (544). At this time, the drug cartridge (500) also descends.

[0080] Next, when the height of the upper cap (542) and the lower cap (544) is lowered to the maximum by the lowering of the upper cap (542), the lowering of the drug cartridge (500) is stopped, and the pressure member (320) coupled to the lower part of the piston rod body (310) lowers the sealing material (520) located on the upper side of the body (510) of the drug cartridge (500).

[0081] Next, the injection needle (530) exposed on the lower side of the tip (150) penetrates the skin and is inserted into the body, simultaneously injecting a drug into the body (510).

[0082] Next, after injecting the drug, the upper cap (542) is pressed upward by the restoring force of the cap spring (546), which has both ends supported on the inside of the upper cap (542) and the inner bottom of the lower cap (544), thereby concealing the injection needle (530) inside the upper cap (542) and the lower cap (544).

[0083] Meanwhile, when replacement of the drug cartridge (500) is required, the second body (120) is separated from the first body (110), and the body (510) of the drug cartridge (500) 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 (500) equipped with a protective cap (540). In this case, the injection needle (530) is protected by the protective cap (540), thereby preventing damage to the injection needle (530). After that, the second body (120) is rotated to reattach it to the first body (110) and then used again.

[0084] Furthermore, when adjustment of the withdrawal length of the injection needle (530) is required due to the thickness of the skin or the control of the drug withdrawal amount, the tip (150) is rotated in the opposite direction of the second body (120) to separate the upper part of the tip (150) from the lower part of the leveler (160), and then the leveler (160) is rotated toward the tip (150) so that the lower part of the leveler (160) comes into close contact with the upper part of the tip (150).

[0085] At this time, the upper part of the leveler (160) points to the scale (126) marked on the step (125) of the second body (120), and the injection needle (530) is withdrawn by the corresponding scale (126).

[0086] Furthermore, when the withdrawal length of the injection needle (530) is adjusted, the length to which the piston rod body (310) presses the sealing material (520) of the drug cartridge (500) is also proportional, so the supply amount (administration amount) of the drug discharged through the injection needle (530) can also be adjusted.

[0087] Thus, the automatic syringe (10) equipped with the dosage control function of the present invention can be used by fixing the syringe, which has a protective cap (540) attached to the injection needle (530) portion, without removing the protective cap (540), and fixing the drug cartridge (500) to the front end of the piston rod (300), and when operating to inject, the length of the injection needle (530) exposed can be adjusted, for example, between 4 and 8 mm by moving the tip (150) and the leveler (160), and has a piston structure that is fired by the locking piece (220) of the piston rod holder (200), and the drug cartridge (500) fixed to the front end of the piston rod (300) is separated when the piston rod (300) is fired, and the injection needle (530) is exposed as the protective cap (540) is compressed.

[0088] 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.

[0089] [Explanation of the symbol]

[0090] 10: Automatic syringe equipped with dosage control function 100: Main body

[0091] 110: 1st Body 120: 2nd Body 130: Body Tower

[0092] 140: Holder Lock 150: Tip 160: Leveler

[0093] 200: Piston rod holder 210: Support 220: Locking piece

[0094] 230: Spring 300: Piston rod 310: Piston rod body

[0095] 320: Pressure member 330: Support member 400: Elastic member

[0096] 500: Drug cartridge 510: Body 520: Sealing material

[0097] 530: Syringe needle 540: Protective cap

Claims

1. A main body part to which a drug cartridge is coupled on one side of the interior; A piston rod that moves along the interior of the main body and provides pressure to spray the drug stored inside the drug cartridge; A piston rod holder provided on the other side of the interior of the main body, which unlocks the state so that the elastically supported piston rod moves toward the drug cartridge by means of elastic force when operated; and It includes a protective cap that is coupled to surround the injection needle of the above drug cartridge, and which adjusts the withdrawal distance of the injection needle as the upper portion of the divided portion moves downward by the downward distance of the piston rod while in an upper and lower divided state. The above main body part is, A first body having a through hole formed at the other end of its outer surface so that the push button of the piston rod holder passes through it; A second body having one end spirally connected to the other end of the first body and a spiral projection formed on the other end; A body top that is spirally fastened to the other end of the first body and to which a clip is attached; and An automatic syringe having a dosage control function, characterized by including a tip that is spirally connected to the spiral projection at the other end of the second body and whose length is adjusted according to the amount of connection.

2. A main body part to which a drug cartridge is coupled on one side of the interior; A piston rod that moves along the interior of the main body and provides pressure to spray the drug stored inside the drug cartridge; A piston rod holder provided on the other side of the interior of the main body, which unlocks the state so that the elastically supported piston rod moves toward the drug cartridge by means of elastic force when operated; and It includes a protective cap that is coupled to surround the injection needle of the above drug cartridge, and which adjusts the withdrawal distance of the injection needle as the upper portion of the divided portion moves downward by the downward distance of the piston rod while in an upper and lower divided state. The above piston rod holder is, A support coupled to the interior of the main body and having a hole formed on one side in an orthogonal direction; A locking piece rotatably coupled to the above hole by means of an axis, having a locking projection formed at one end for engaging or disengaging a locking projection of the piston rod, and a push button formed at the other end; and An automatic syringe having a dosage control function, characterized by including a spring provided on the opposite surface of the other end of the locking piece and the support, which is compressed when the push button of the locking piece is pressed and is configured to provide a restoring force when the push button is released.

3. In Paragraph 1, An automatic syringe having a dosage control function, characterized by further including a leveler in which a scale corresponding to the scale of a drug cartridge is formed on the outer surface of the other end of the second body to which the tip is spirally connected, so that when the position of the tip is adjusted, one end comes into close contact with the other end of the tip and the other end indicates the position of the scale.

4. In Paragraph 1 or 2, An automatic syringe having a dosage control function, characterized in that the above piston rod has a stopper formed thereon to support one end of an elastic part located between the ends of the main body part.

5. In paragraph 1 or 2, the protective cap is, An upper cap in which the injection needle is positioned inside while the end of the above drug cartridge is joined; A lower cap coupled to the lower part of the upper cap and adjusting the withdrawal distance of the injection needle according to the movement distance of the upper cap; and An automatic syringe having a dosage control function, characterized by including a cap spring, the upper and lower caps having both ends supported inside, which is compressed when the upper cap is lowered and restored when the upper cap is raised.

6. In Paragraph 5, An automatic syringe equipped with a dosage control function, characterized in that the upper and lower caps have a maximum withdrawal distance limited by a jaw.

7. In Paragraph 5, An automatic syringe equipped with a dosage control function, characterized in that the lower cap has a radial groove formed on its upper side, allowing it to open when the upper cap is attached.

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