Injector for practice

Abstract

An inner sleeve is fixed on the outer side of a cylinder, the front end portion of the inner sleeve is provided with a clamping concave portion which extends from a long-strip-shaped opening portion on the inner side and is concave towards the front face side, and the bottom of the inner sleeve is provided with a cut-in portion which cuts in from the outer side in the left-right direction. The housing is provided with an inner sleeve capable of sliding inside, a front end opening part which is arranged at the front end part of the inner sleeve and through which a model needle of a needle cylinder in the inner sleeve can be inserted, an outer long opening part which extends from the front end part to the bottom part is arranged at the front side of the bottom part, an end part of the outer long opening part is arranged at the front side of the bottom part, and a clamping convex part which can be clamped as a clamping concave part. The left and right sides of the bottom part are provided with hooking parts which can be hooked on the notch parts, and the inner sides of the front end parts of the hooking parts protrude. The spring urges the inner sleeve toward the bottom end of the housing. The finger handle is installed at the bottom of the housing, and a button part of a protruding part is arranged on the front side and the inner side of the bottom.

Description

[0001] This application claims priority from the application with the application date of September 10, 2024, and the application number of 2024-003054. TECHNICAL FIELD

[0002] The utility model relates to a kind of syringes for practice. BACKGROUND

[0003] In the past, in order to enable users to correctly perform self-injection, there is a technology about syringes for practice. For example, Japanese Patent Publication No. 3-139688 (Patent Document 1) discloses a training device for an automatic syringe having a shaped sleeve, which has a sleeve of a cylindrical shape, is connected to the rear portion of the sleeve by a firing mechanism, and has a holder for housing a punch member attached to the front portion, which can prevent movement. The firing mechanism of the training device has an inside handgun sleeve, a plunger, a coil spring, a locking device, and a safety member. The front end of the inside handgun sleeve is open, and the plunger is movable in the inside handgun sleeve. In addition, the coil spring acts on the plunger to move it outward from the front end of the inside handgun sleeve, the locking device cooperates with the plunger to prevent unnecessary forward movement of the plunger, and the safety member is used to prevent the locking device from being released due to carelessness. Then, the holder of the punch member has a sleeve rear portion and a protruding portion. Here, the sleeve rear portion is open at both ends, and after the training device of the automatic syringe is operated, the rear end of the punch member is transversely moved, and the protruding portion has a central hole having a function of stopping the forward movement of the punch member of the holder after the training device of the automatic syringe is operated, and allowing the front end portion of the punch member to pass. In addition, the punch member is housed in the holder, and the rear end portion thereof is at least substantially engaged with the front end of the plunger. The front end portion of the punch member has a push rod-shaped end portion, which is sized to pass through the central hole of the protruding portion of the holder to move outward, and the push rod-shaped end portion is located inside the holder before the training device of the automatic syringe is used. Furthermore, there is an auxiliary device to facilitate reuse of the training device of the automatic syringe. Moreover, the rear end portion of the punch member cooperates with a device provided on the inner wall of the sleeve-shaped rear portion of the holder to prevent unnecessary forward movement of the punch member of the holder. In addition, the training device of the automatic syringe is in the region of the device, so that after the brake, the wall of the holder is elastically extended outward in the outer sleeve to allow the punch member to pass. This makes it easy to pull the needle cap off the syringe, avoids the cover from automatically opening during self-injection, alleviates the patient's resistance to self-injection, and allows the syringe to be checked in the closed state of the cover.

[0004] Further, in Japanese Patent Application Publication No. 2009-514605 (Patent Literature 2), an automatic injector operation practice device for a user to practice administering a drug is disclosed. In this device, the operation practice device has a housing, a cover member, a spring member, a movement mechanism, and a safety pin. The cover member is slidable within the housing from an introduction position relative to the housing before operation to a protrusion position relative to the housing after operation. Then, the spring member pushes the cover member toward the protrusion position, and the movement mechanism is linked to the cover member and controls movement of the cover member from the introduction position to the protrusion position in response to a user's action on the operation practice device. The safety pin is detachably attached to the movement mechanism, and when the safety pin is in the attached state, the action of the operation practice device is prevented, and movement of the cover member from the introduction position to the protrusion position is prevented. In this way, the user can familiarize and master the entire process of using the automatic injector before actually performing the drug injection.

[0005] Further, in Japanese Patent Application Publication No. 2015-514518 (Patent Literature 3), a shielded needle safety device capable of being combined with a medicine cartridge is disclosed. The shielded needle safety device has a main body, a needle shield, a plunger, and a spring. The main body is for receiving the medicine cartridge, and the needle shield is for covering a used needle. In addition, the plunger is for injecting a medicine from the medicine cartridge, and the spring is for activating the action of the needle shield. The needle shield has a space between the fingers, so that the flange of the medicine cartridge does not contact the fingers in assembly. Thus, the risk of the device being partially activated can be eliminated.

[0006] Further, in Japanese Patent Application Publication No. 2015-532466 (Patent Literature 4), a training device for training a user to operate an automatic injector for injecting a medicine is disclosed. The training device includes a housing, a needle shield, an actuation assembly, and a safety device. The housing has a distal end and a proximal end, the needle shield is slidably received on the distal end of the housing, and is slidable from a first extended position relative to the housing before operation of the training device to a received position relative to the housing during operation of the training device, and to a second extended position relative to the housing after operation of the training device. The actuation assembly is connected to the needle shield and has a force application member and a lock to control movement of the needle shield from the received position to the second extended position. The lock fixes the needle shield in the second extended position in the locked position. The safety device is adjacent to the proximal end of the housing and prevents movement of the needle shield from the first extended position to the received position in the received position. With the safety device in the activated position, the needle shield is movable to the received position, and the safety device resets the lock when the safety device returns to the received position. In this way, an individual can be trained.

[0007] Further, Japanese Patent Application Publication No. 2017-215604 (Patent Literature 1) discloses an automatic injection training device. The automatic injection training device includes a polishing assembly of a housing, a drive assembly, a damping housing, and a damping unit. The damping unit includes a piston assembly within a damping housing that slides proximally relative to the piston assembly when simulating an injection. Thus, a user of the automatic injection device can learn proper operation and become familiar with use thereof.

[0008] Further, Japanese Patent Application Publication No. 2020-056829 (Patent Literature 2) discloses an automatic injection training device. Here, the automatic injection training device has a cylindrical main body member, a plunger movably arranged in the main body member in a forward and rearward direction, and a first elastic member that applies a force to the plunger in the forward direction. In a state before use, the plunger is locked at a rear position in the main body member against the force of the first elastic member, a start sound is emitted in conjunction with movement of the plunger starting when the locking of the plunger is released, and an end sound is emitted in conjunction with movement of the plunger ending. Thus, a patient can repeatedly practice an operation method of the automatic injection device and become familiar with the operation.

[0009] Although the structure of the practice injector is diversified as the technology described in Patent Literatures 1 to 6 above, in order to repeatedly practice, the practice injector needs to be returned to a state before injection after injection practice using the practice injector.

[0010] In the technology described in Patent Literatures 1 to 6 above, the structure of the practice injector is complicated, and there is a problem that it takes time and is difficult for a user to understand when returning the practice injector to a state before injection.

[0011] Further, if an actual medical injector actually provided with a medicine is changed to a practice injector, a new structure needs to be added to the actual medical injector. Adding the new structure increases the size of the practice injector, or the structure of the actual injector cannot be reproduced, which leads to a problem that the use of the practice injector is different from that of the actual injector and cannot be used for injection practice of the actual injector. Such a problem cannot be solved by the technology described in Patent Literatures 1 to 6 above.

[0012] Therefore, the present application is proposed to solve the above problems, and aims to provide a practice injector that can make a user feel the use of an actual medical injector when injecting the actual medical injector and can easily return to a state before injection. SUMMARY

[0013] An object of the present application is to provide a practice injector that can make a user feel the use of an actual medical injector when injecting the actual medical injector and can easily return to a state before injection.

[0014] To achieve the above object, the utility model provides an exerciser for syringe, including:

[0015] The cylinder has a model needle which can slide in the front and back directions,

[0016] The plunger is inserted into the interior of the cylinder and can slide in the front and back directions, and has a head part which protrudes in the left and right directions at the bottom,

[0017] The inner sleeve is fixed outside the cylinder, has an inner long strip opening part from the front end to the bottom on the front side, has a clamping concave part which extends from the inner long strip opening part and is recessed towards the front side at the front end, and has an outer sleeve which is cut from the outer side of the left and right cut parts at the bottom,

[0018] The inner sleeve can slide inside, has a front end opening part at the front end through which the model needle of the inner cylinder can be inserted, has an outer long strip opening part from the front end to the bottom on the front side, has a clamping convex part at the end of the outer long strip opening part on the front side as a clamping part which can clamp the clamping concave part at the bottom, has a hooking part on the left and right sides which can be hooked on the cut part at the bottom, and has a protruding part which protrudes towards the inner side at the front end of the hooking part,

[0019] The spring is arranged between the front end of the inner sleeve and the interior of the outer shell and exerts force on the inner sleeve in the direction of the bottom of the outer shell,

[0020] The finger handle is installed at the bottom of the outer shell, and the button part which has a protruding part on the front side is arranged at the bottom, when the clamping concave part and the clamping convex part of the outer shell are clamped, the protruding part is pressed to make a part of the clamping concave part stagger downwards.

[0021] The utility model discloses an injection for practice includes cylinder, plunger, inside sleeve, outside casing, spring and finger handle. Cylinder has the model needle of being able to slide along the front and back direction at the front end part. The front end part of plunger inserts the inside of above-mentioned cylinder, can slide along the front and back direction in the inside of this cylinder, and there is the head portion that can puff to left and right directions at the bottom. Inside sleeve is fixed at the outside of above-mentioned cylinder, and has from the front end to bottom along inside long strip opening, at the front end, at the front side, has the snap -in recess that extends from this inside long strip opening and recesses to the front side, at the bottom, has the cut -out portion that cuts into from the outside of left and right directions. Outside casing can slide in the inside through the inside sleeve, has the front end opening of the model needle of cylinder in this inside sleeve can be inserted at the front end, at the front side, has the outside long opening portion from the front end portion to the bottom, at the bottom, at the front side, has the end of this outside long opening portion, as the snap -in convex part that can snap -in the snap -in recess, at the bottom, at the left and right sides, has the hooking portion that can be hooked on the cut -out portion, at the front end portion of this hooking portion, protrudes on the inside. Spring is arranged between the front end portion of inside sleeve and the inside of outside casing, and exerts force to the inside sleeve to the bottom direction of outside casing. Finger handle is installed at the bottom of outside casing, has the button portion that is provided with the protruding portion on the inside at the front side at the bottom, when the snap -in recess of inside sleeve and the snap -in convex part of outside casing are snapped, the button portion is pressed down, thereby, the protruding portion crosses the snap -in convex part, and makes a part of snap -in recess move to the square.

[0022] The injection for practice can make the user feel the use feeling when injecting the real injection, and can easily restore to the state before injection. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is the exploded view of the injection for practice.

[0024] Figure 2 It is the front view, right view, rear view, left view, top view and bottom view of the initial state of the injection for practice.

[0025] Figure 3 It is the perspective view when the needle cap of the injection for practice is removed.

[0026] Figure 4 It is the perspective view when the model needle of the injection for practice is pressed against the skin.

[0027] Figure 5 It is the perspective view when the plunger of the injection for practice is pushed to the cylinder.

[0028] Figure 6 It is the plane view of the injection for practice, and shows the schematic diagram of the protruding portion of plunger head portion hooking part before and after contact.

[0029] Figure 7 For the plan view of the practice syringe, the front view of the protrusion of the hook part of the plunger head contacting the outer shell is shown.

[0030] Figure 8 For the practice syringe, the perspective view of the engagement of the engagement recess of the inner sleeve with the engagement protrusion of the outer shell is shown.

[0031] Figure 9 For the practice syringe, the front view, right view, rear view, left view, top view and bottom view after injection.

[0032] Figure 10 For the practice syringe, the perspective view when the head of the plunger is pulled out of the barrel.

[0033] Figure 11 For the practice syringe, the perspective view when the button part of the finger grip is pressed and the inner sleeve is pushed into the outer shell.

[0034] Figure 12 For the practice syringe, the front view when the button of the finger grip is pressed and the inner sleeve is pushed into the outer shell, and then the hook part of the outer shell is brought into the recess part of the outer shell.

[0035] Figure 13 For the perspective view of installing the needle cap to the practice syringe.

[0036] Figure 14 For the practice syringe, the perspective view of the different shapes of the button part of the finger grip and the protrusion part of the finger grip.

[0037] In the figure:

[0038] 1. Practice syringe

[0039] 10. Barrel

[0040] 20. Plunger

[0041] 30. Inner sleeve

[0042] 40. Outer shell

[0043] 50. Spring

[0044] 60. Finger grip

[0045] 70. Needle cap DETAILED DESCRIPTION

[0046] Hereinafter, the embodiments of the present application will be described with reference to the accompanying drawings for the understanding of the present application. The following embodiments are one example of embodying the present application, and are not the nature of limiting the technical scope of the present application.

[0047] As Figure 1 shown in the figure, the utility model discloses an exercise syringe 1 has cylinder 10, plunger 20, inner sleeve 30, shell 40, spring 50, finger handle 60.

[0048] Cylinder 10 has model needle 11 that can slide along the front and back direction (front and back direction) at the front end part 10a.Model needle 11 is constituted by needle body 11a, elastomer 11b and fixed part 11c, from the cylinder opening part 10b1 on the bottom 10b of cylinder 10, needle body 11a, elastomer 11b and fixed part 11c are inserted in this order, needle body 11a is inserted in needle insertion hole 10a1 that is opened in advance in the front end part 10a of cylinder 10, in the state that elastomer 11b is pressed on needle body 11a, fixed part 11c is fixed through the inside of the front end part 10a of cylinder 10.Model needle 11 is arranged to be able to slide along the front and back direction in the front end part 10a of cylinder 10.

[0049] In addition, the front end part 20a of plunger 20 is inserted into the inside of cylinder 10 and can slide along the front and back direction in the inside of this cylinder 10, and the head 21 can be inflated in the left and right direction at the bottom 20b.Here, the front end part 20a of plunger 20 is provided with a cylindrical rubber body 20a1, and the rubber body 20a1 of the front end part 20a of plunger 20 is inserted from the cylinder opening part 10b1 of the bottom 10b of cylinder 10, so that plunger 20 can slide along the front and back direction in the inside of cylinder 10.

[0050] Inner sleeve 30 is fixed on the outside of cylinder 10 and has an inside long strip opening part 31 from the front end part 30a to the bottom 30b on the front side.Inner sleeve 30 has a snap-in recess 32 extending from the inside long strip opening part 31 and recessed to the front side at the front end part 30a of the inside long strip opening part 31.Here, the snap-in recess 32 extends from the front end part 30a to the bottom 30b of the inside long strip opening part 31 by a predetermined length and forms aコ shape when viewed from the left and right sides, and the front end part 32a of the snap-in recess 32 is configured as a free end part.Here, in the inner sleeve 30 of the utility model, the structure of adding the snap-in recess 32 and other structures to the inner sleeve relative to the structure of the actual medicine syringe is completed.

[0051] Inner sleeve 30 has a cutout part 33 cut from the outside in the left and right directions at the bottom 30b.Cutout part 33 is cut in aコ shape at the left and right sides of the bottom 30b of inner sleeve 30 respectively.In addition, inner sleeve opening part 30b1 is provided at the bottom 30b of inner sleeve 30, the front end part 30a of inner sleeve 30 is occluded, and the front end part 10a of cylinder 10 is inserted through the inner sleeve opening part 30b1 of the bottom 30b of inner sleeve 30.

[0052] Here, a flange 10b2 in a disc shape is provided on the cylindrical opening part 10b1 of the bottom 10b of the cylinder 10, and a grip cutout part 30b2 cut from the inside to the outside is provided on the bottom 30b of the inner sleeve 30 on the left and right sides, and when the cylinder 10 is put inside the inner sleeve 30, the flange 10b2 of the cylinder 10 is inserted into the grip cutout part 30b2 of the inner sleeve 30, thereby fixing the inner sleeve 30 on the outside of the cylinder 10. The structure of the utility model in this aspect follows the structure of the actual medicine injector.

[0053] In addition, the housing 40 allows the inner sleeve 30 to slide inside, and has a front end opening part 41 on the front end part 40a, and the model needle 11 of the cylinder 10 inside the inner sleeve 30 can be inserted through the front end opening part 41. In addition, the housing 40 has an outside long strip opening part 42 from the front end part 40a to the bottom 40b on the front side, and the housing 40 sets the end part 43 of the outside long strip opening part 42 as a fitting convex part 43 capable of being fitted with the fitting recess part 32 on the front side of the bottom 40b. The housing 40 has a hooking part 44 capable of being hooked on the cutout part 33 on the left and right sides of the bottom 40b, and has a protruding part 45 protruding to the inside on the front end part 44a of the hooking part 44.

[0054] Here, the fitting convex part 43 is composed of the end part of the bottom 40b of the housing 40, and is part of the frame of the housing 40. Therefore, in the housing 40 of the utility model, several structures such as the fitting convex part 43 added to the housing relative to the structure of the actual medicine injector are completed.

[0055] In addition, the hooking part 44 is composed of an arm-shaped long strip shape extending to the outside from the bottom 40b of the housing 40 in the front and back directions of the housing 40, and a quadrangular shape protruding from the front and back sides of the long strip shape. The steps of the long strip shape and the quadrangular shape of the hooking part 44 can be hooked on the cutout part 33. Moreover, the protruding part 45 is composed of protruding to the half-cylindrical shape from the front end part 44a of the long strip shape of the hooking part 44.

[0056] The guide part 46 is provided beside the hooking part 44 of the housing 40, and is composed of a long strip shape protruding to the inside on the front end part. On the other hand, corresponding to the guide part 46 of the housing 40, the guide recess part 34 capable of being entered by the guide part 46 is provided on the front end part 30a and the bottom 30b of the inner sleeve 30. Therefore, when the inner sleeve 30 slides inside the housing 40, the guide part 46 of the housing 40 enters the guide recess part 34 of the front end part 30a or the bottom 30b of the inner sleeve 30, thereby the inner sleeve 30 of the housing 40 can be positioned at the housing 40. This part of the structure of the utility model also follows the structure of the actual medicine injector.

[0057] The spring 50 is provided between the front end portion 30a of the inner sleeve 30 and the inside of the housing 40, and applies a force to the inner sleeve 30 in the direction of the bottom of the housing 40. Here, the front end portion 30a of the inner sleeve 30 is closed, but is provided with support portions 30a1 extending outward from the four corners of the front end portion 30a, and the spring 50 abuts against the four support portions 30a1 of the front end portion 30a of the inner sleeve 30, so that the inner sleeve 30 does not shake laterally even if it slides inside the housing 40.

[0058] Although the front end opening portion 41 is present at the front end portion 40a of the housing 40, the width of the spring 50 is larger than the width of the front end opening portion 41, so the spring 50 does not come off the front end opening portion 41 of the front end portion 40a of the housing 40. This part of the structure of the present application also follows the structure of the actual medicine injector.

[0059] In addition, the finger grip 60 is mounted on the bottom 40b of the housing 40, has a button portion 61 on the front side of the bottom 60a, and is provided with a protrusion portion 61a on the inside, so that when the engaging recess portion 32 of the inner sleeve 30 and the engaging protrusion portion 43 of the housing 40 are engaged, by pressing the button portion 61, the protrusion portion 61a passes over the engaging protrusion portion 43, and a part of the engaging recess portion 32 is moved downward.

[0060] Here, the finger grip 60 is formed in a wing shape that is pointed toward the front end portion 60b from the bottom 60a in the left-right direction, and the button portion 61 is provided outward from the bottom 60a of the finger grip 60 in the center. The protrusion portion 61a of the button portion 61 is a free end portion. Here, in the finger grip 60 of the present application, the structure of the button portion 61 and the like is added to the structure of the finger grip in the structure of the actual medicine injector.

[0061] In addition, as shown in Figure 1 In addition, as shown in

[0062] In this way, the injector aid 1 of the present application, by having the cylinder 10, the plunger 20, the inner sleeve 30, the housing 40, the spring 50, and the finger grip 60, can make the user feel the use of the actual medicine injector when injecting it, and can easily return to the state before injection.

[0063] Specifically, first, when the user prepares to practice with the training syringe 1, the front end portion 20a of the plunger 20 of the training syringe 1 is disposed inside the bottom portion 10b of the cylinder 10, the inner sleeve 30 is pushed against the force of the spring 50 to the inside of the housing 40, and becomes a state in which the hooking portion 44 is hooked on the cutout portion 33.

[0064] Further, as Figure 2 shown, since the inner sleeve 30 becomes a state of being housed inside the housing 40, the engagement recess 32 of the inner sleeve 30 can be seen through the long side opening portion 42 of the outside of the housing 40.

[0065] On the other hand, due to the presence of the inner sleeve 30 or the housing 40, it is difficult to view the front end portion 20a of the plunger 20 and the bottom portion 10b of the cylinder 10 from the outside, but the head portion 21 of the plunger 20 is in a state of being lifted to the outside. Therefore, the user recognizes the state before injection by confirming the housing of the inner sleeve 30 and the pulling up of the head portion 21 of the plunger 20.

[0066] As Figure 3 shown, the user holds the training syringe 1 with the hand, removes the needle cap 70 from the front end portion 10a of the cylinder 10, and exposes the model needle 11. As Figure 4 shown, the user abuts the model needle 11 of the training syringe 1 against the affected part of the skin of the predetermined injection. In this way, the injection of the training syringe 1 is ready. Although it is the training syringe 1, it is similar to the operation of the actual drug syringe, and the user can use the training syringe 1 for practice in the same use method as the actual drug syringe.

[0067] Next, as Figure 5 shown, the user abuts the finger against the head portion 21 of the plunger 20 and presses the plunger 20 into the flange 10b2 of the cylinder 10. Then, the head portion 21 abuts against the protruding portion 45 of the hooking portion 44 of the housing 40, as Figure 6-7 shown, the protruding portion 45 causes the hooking portion 44 to move outward, thereby releasing the hooking of the hooking portion 44 from the cutout portion 33.

[0068] Thus, the inner sleeve 30 is pushed in the direction of the bottom of the outer case 40 by the force of the spring 50 present inside the outer case 40, and the engagement recess 32 of the inner sleeve 30 engages with the engagement protrusion 43 of the outer case 40. Thus, the inner sleeve 30 is temporarily fixed to the bottom 40b of the outer case 40. Further, when the inner sleeve 30 is removed from the outer case 40, the guide portion 46 of the outer case 40 disengages from the guide recess 34 of the bottom 30b of the inner sleeve 30, enters the guide recess 34 of the front end portion 30a of the inner sleeve 30, and is positioned. The model needle 11 is able to slide with respect to the affected portion of the skin, allowing the user to imagine self-injection. Up to this point, it is a series of actions of the user when injecting using the practice injector 1. This part of the operation is similar to the operation of an actual medicine injector, and as described above, the user is able to experience the same feeling as with an actual medicine injector in the practice injector 1.

[0069] Further, as shown in FIG. 6, if the engagement recess 32 of the inner sleeve 30 engages with the engagement protrusion 43 of the outer case 40, even if the user presses the head 21 of the plunger 20 with a finger again, the inner sleeve 30 cannot be simply inserted into the inside of the outer case 40. Thus, although it is the practice injector 1, the user is able to experience the safety device of the needle of an actual injector 1 as with an actual medicine injector. Figure 8

[0070] Here, in the state after injection of the practice injector 1, as shown in FIG. 5, since the button portion 61 of the finger grip 60 is present on the surface side of the engagement protrusion 43 of the outer case 40, the state in which the engagement recess 32 of the inner sleeve 30 is hooked on the engagement protrusion 43 of the outer case 40 cannot be visually confirmed in general. Figure 9

[0071] Next, in the case where the user returns the practice injector 1 to the state before injection, as shown in FIG. 6, first, the user holds the outer case 40 with one hand, and pulls the head 21 of the plunger 20 from the cylinder 10 with the other hand, so that the head 21 of the plunger 20 does not come into contact with the protrusion 45 of the outer case 40. Figure 10

[0072] Next, as shown in FIG. 6, the user holds the bottom 30b of the inner sleeve 30 with the other hand, and presses the button portion 61 of the finger grip 60 while pressing the inner sleeve 30 into the inside of the outer case 40. Figure 11

[0073] As shown in FIG. 6, when the button portion 61 is pressed in the state in which the engagement recess 32 of the inner sleeve 30 engages with the engagement protrusion 43 of the outer case 40, the protrusion portion 61a of the button portion 61 passes over the engagement protrusion 43, and the front end portion 32a, which is a part of the engagement recess 32, moves downward. Thus, the engagement of the engagement recess 32 of the inner sleeve 30 from the engagement protrusion 43 of the outer case 40 is released. Figure 12 ​​​​​

[0074] Thus, the inner sleeve 30 temporarily fixed to the outer shell 40 can slide in the direction of the front end of the outer shell 40, and the user then presses the inner sleeve 30 toward the inside of the outer shell 40, whereby the hooking portion 44 of the outer shell 40 is hooked again on the cutout portion 33 of the inner sleeve 30, and the state before injection can be easily restored.

[0075] In addition, as described above, in the present application, while the structure of the real medicine injector is adopted, by adding some structures, the practice injector 1 is constituted, and the action and operation of the practice injector 1 are reproduced to the same action and operation of the real medicine injector. Thus, as described above, so far, the present application solves the problem that if the real medicine injector is improved to the practice injector, the main body size of the practice injector becomes large, or the structure of the real medicine injector cannot be reproduced, and the practice injector can be manufactured with the same main body size as that of the real medicine injector, and the user can feel the use feeling when the real medicine injector is injected.

[0076] In the present application, since the main body size of the practice injector can be completed to be the same as that of the real medicine injector, the injector assisting tool for assisting the injection of the real medicine injector existing in the past can be directly used. Therefore, the user can use the existing assisting tool for the practice injector, and perform the injection practice in the practice injector in the same way as the injection of the real medicine injector.

[0077] If the practice injector 1 returns to the state before injection, as shown in Figure 4 , the user can place the model needle 11 of the practice injector 1 on the affected part of the skin to be injected, and then perform the injection practice again. In the structure of the real medicine injector, the safety device is activated, and the injector is disposable for safety reasons, and cannot be repeatedly used. On the other hand, in the practice injector 1 of the present application, although the safety device works, by adding some structures, the safety device can be easily released, in the same way as the operation of the real medicine injector. Therefore, in the present application, the user can easily repeatedly practice.

[0078] On the other hand, when the user finishes the injection practice, as shown in Figure 13 , by installing the needle cap 70 on the front end portion 10a of the cylinder 10, the practice injector 1 can be arranged.

[0079] Here, the materials of the cylinder 10, the plunger 20, the inner sleeve 30, the outer shell 40, the finger grip 60, and the needle cap 70 are not particularly limited, but resins such as ABS resin, polystyrene, polyethylene, polypropylene, or metals such as aluminum, iron, and stainless steel can be appropriately used. In addition, it is preferable that the materials of the cylinder 10, the inner sleeve 30, and the outer shell 40 are transparent, so that the state of the plunger 20 can be visually confirmed.

[0080] In addition, the structure of the spring 50 is not particularly limited, and for example, a coil spring, a leaf spring, or the like can be appropriately used. In addition, the material of the spring 50 is not particularly limited, and for example, a metal such as iron, stainless steel, copper, or nickel alloy can be appropriately used. In addition, the material of the elastic body 11b constituting the model needle 11 is the same.

[0081] In addition, the shape of the button portion 61 of the finger grip 60 is not particularly limited, and for example, as shown in FIG. 6, the shape of the button portion 61 can be a disc shape, or can be a cylindrical shape. In addition, the shape of the protrusion portion 61a of the button portion 61 is not particularly limited, and for example, as shown in FIG. 7, the shape can be a shape in which the front end portion is gradually protruded to be flat, or can be a shape in which rectangular layers are stacked to be stepped. Figure 14 Figure 14 In addition, the shape of the protrusion portion 61a of the button portion 61 is not particularly limited, and for example, as shown in FIG. 7, the shape can be a shape in which the front end portion is gradually protruded to be flat, or can be a shape in which rectangular layers are stacked to be stepped.

[0082] As described above, the present application is not limited to an automatic injector, and is effective as a practice injector that can be applied to any injector, that can make a user feel the use of an actual medicine injection when an injection is performed, and that can easily return to a state before the injection.​

Claims

1. An exercise syringe characterized in that, Comprise: a cylinder having a model needle slidable in the front-rear direction at the front end portion, a plunger having a head portion bulged in the left-right direction at the bottom portion, inserted into the inside of the cylinder and slidable in the front-rear direction inside the cylinder, an inner sleeve fixed outside the cylinder, having an inside long slit opening portion from the front end portion to the bottom portion at the front side, a fitting recess portion recessed toward the front side from the inside long slit opening portion at the front end portion, and a cutout portion cut from the outside of the left-right cutout portion at the bottom portion, the inner sleeve slidable inside, having a front end opening portion through which the model needle inside the cylinder at the front end portion can be inserted, an outside long slit opening portion from the front end portion to the bottom portion at the front side, and a fitting convex portion at the end of the outside long slit opening portion at the front side as a portion capable of fitting into the fitting recess portion at the bottom portion, a housing having a hooking portion capable of being hooked on the cutout portion at the left-right side at the bottom portion, and a protruding portion protruding toward the inside at the front end portion of the hooking portion, a spring arranged between the front end portion of the inner sleeve and the inside of the housing, and applying force to the inner sleeve in the direction of the bottom portion of the housing, a finger grip installed at the bottom portion of the housing, having a button portion with a protruding portion at the front side at the bottom portion, and when the fitting recess portion and the fitting convex portion of the housing are fitted, by pressing the button portion, the protruding portion goes over the fitting convex portion, and a portion of the fitting recess portion is misaligned downward.

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