JP7166124B2 - automatic injection training device - Google Patents

Description

The present invention relates to an automatic injection training device.

In order to treat a disease, there is a case where a patient himself/herself performs an injection using an automatic injection device at home or the like to administer a medicine. Prior to initiating such therapy, healthcare professionals must teach patients how to use an automatic injection device. An automatic injection training device is known as a device used at that time. An autoinjection training device differs greatly from an autoinjection device in that it does not have an injection needle and a drug solution. The shape and method of operation of the autoinjector training device are configured to be similar to the actual autoinjector for that purpose. By using the automatic injection training device, the patient can repeatedly train the operation method of the automatic injection device and become accustomed to the operation.

As an auto-injection trainer, for example, US Pat. No. 5,800,000 discloses an auto-injection trainer that can provide audible feedback that mimics the sound produced by a conventional injection device at the start of penetration.

Japanese Patent Publication No. 2015-532466

However, Patent Document 1 does not disclose any specific configuration for realizing audible feedback. In particular, it is desirable to provide audible feedback to the user both at the beginning and at the end of operation of the autoinjection training device.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an auto-injection training device that provides audible feedback to the user both at the beginning and at the end of movement.

According to one aspect of the present invention, the apparatus comprises a cylindrical main body member, a plunger arranged so as to be movable back and forth within the main body member, and a first elastic member that biases the plunger forward, and is used. In the previous state, the plunger is locked at the rear position within the main body member against the biasing force of the first elastic member, and when the plunger is released from the lock, the plunger starts to move. An automatic injection training device is provided, characterized in that a start sound is emitted and an end sound is emitted upon completion of movement of the plunger.

The plunger may have a first impact portion, and the first impact portion may collide with a second impact portion provided within the body member to produce the start sound. The recessed part provided in the outer surface of the said plunger may be sufficient as a said 1st collision part. Locking of the plunger may be performed by the recess. The collision member is further provided so as to be movable back and forth within the main body member, the movement of the collision member is started in accordance with the movement of the plunger, and the collision member is a third collision member provided within the main body member. The end sound may be emitted by colliding with the part. The collision member may be an annular member. A first projection is formed on the inner surface of the annular member, a second projection is formed on the side surface of the plunger, and the first projection and the second projection cooperate to initiate movement of the collision member. You may do so. A cylindrical barrel member may be further provided, and frictional resistance may be generated between the outer surface of the plunger and the inner surface of the barrel member when the plunger is moved.

Aspects of the present invention have the common advantage of providing an autoinjector training device that provides audible feedback to the user both at the beginning and at the end of movement.

FIG. 1 is a longitudinal cross-sectional view of an automatic injection training device according to an embodiment of the present invention before use. FIG. 2 is a vertical cross-sectional view of the automatic injection training device at the start of operation. FIG. 3 is a vertical cross-sectional view of the automatic injection training device after use. FIG. 4 is a longitudinal cross-sectional view of the body member. FIG. 5 is an exploded view of the components within the body member; FIG. 6 is an exploded view including the barrel member and locking tube; FIG. 7 is a schematic side view of the plunger and impact member; FIG. 8 is a partial vertical cross-sectional view for explaining the generation of the start sound. FIG. 9 is a partial vertical cross-sectional view for explaining the generation of the ending sound. FIG. 10 is an exploded view of the initialization device of the autoinjector training device. FIG. 11 is a longitudinal sectional view of the initialization device before use. FIG. 12 is a vertical cross-sectional view of the initialization device after use.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Corresponding elements are provided with common reference numerals throughout the drawings.

FIG. 1 is a longitudinal sectional view of the automatic injection training device 100 according to the embodiment of the present invention before use, and FIG. 2 is a longitudinal sectional view of the automatic injection training device 100 at the start of operation. 3 is a vertical cross-sectional view of the automatic injection training device 100 after use, FIG. 4 is a vertical cross-sectional view of the main body member, and FIG. 6 is an exploded view including the barrel member 2 and locking tube 63, and FIG. 7 is a schematic side view of the plunger 4 and impact member 22. As shown in FIG.

The automatic injection training device 100 includes a cylindrical main body member 1 with one end open, a cylindrical barrel member 2 arranged in the main body member 1, a cylindrical plunger 4 having a piston 3 at the tip, It has a first coil spring 5 as a first elastic member arranged inside the plunger 4 , a lock mechanism 6 , and a guide rod 7 fixed to the bottom of the body member 1 .

The piston 3 and plunger 4 move toward the open end of the main body member 1 by the biasing force of the first coil spring 5 during operation of the automatic injection training device 100, as shown in FIGS. In this specification, in the axial direction of the automatic injection training device 100, the direction in which the piston 3 and the plunger 4 advance during operation (downward in the figure) is defined as the "front" side, and the opposite side (upward in the figure) Defined as the "rear" side.

Referring to FIG. 4, the inner surface of the body member 1 is formed with a first engaging projection 11 extending in the axial direction. A plurality of inwardly protruding second engaging projections 12 are formed on the inner surface of the front end portion of the body member 1 . A window hole 13 that is a substantially rectangular through hole is formed in the side surface of the body member 1 . A removable cap may be placed against the open end of the body member 1 .

The piston 3 and plunger 4 can move forward within the body member 1 , that is, within the barrel member 2 by the biasing force of the first coil spring 5 . The plunger 4 is arranged behind the barrel member 2 while compressing the first coil spring 5 in the pre-use state shown in FIG. Forward movement of the plunger 4 due to the biasing force of the first coil spring 5 is locked by the lock mechanism 6 as will be described later. The guide rod 7 is located within the first coil spring 5 and within the plunger 4 in the pre-use state shown in FIG. The forward movement of the plunger 4 is guided by the guide rod 7 .

Referring particularly to FIG. 6, the outer surface of the rear portion of the barrel member 2 is provided with a first annular recess 21 in which an impact member 22, which is an annular member, is arranged. In addition, in FIG. 6 , the collision member 22 is drawn outside the first annular recess 21 for convenience. A plurality of first locking pieces 23 that can be elastically deformed inwardly and outwardly are provided at the rear end of the barrel member 2 . A first locking portion 231 is formed on the inner surface of each of the first locking pieces 23 as will be described later. A second coil spring 24 is arranged behind the collision member 22 in the first annular recess 21 . A gap 211 extending in the axial direction is formed in the first annular recess 21 . An engaging step 2111 that is a step facing rearward is formed in the gap 211 .

A third engagement projection 221 corresponding to the gap 211 is formed on the inner surface of the collision member 22 . The third engaging projection 221 can move forward and backward within the gap 211 . Therefore, the collision member 22 can move forward and backward within the first annular recess 21 while the third engaging projection 221 is restricted by the gap 211 . In the pre-use state shown in FIG. 1 , while the collision member 22 compresses the second coil spring 24 , the third engaging protrusion 221 is engaged with the engaging step 2111 within the gap 211 .

Referring particularly to FIG. 7, the outer surface of plunger 4 is formed with a second annular recess 41 . On the outer surface of the plunger 4 , a push projection 42 is formed behind the second annular recess 41 and a pull projection 43 is formed forward of the second annular recess 41 . The push projection 42 and the pull projection 43 are spaced apart in the axial direction and are arranged at circumferentially displaced positions. In FIG. 7, the impact member 22 is drawn in phantom lines with the plunger 4 inserted. A first slope 2211 is formed at the rear end of the third engaging projection 221 of the collision member 22 , and a first slope 2211 inclined in the same direction as the first slope 2211 is formed at the front end of the third engaging projection 221 of the collision member 22 . Two slopes 2212 are formed. A third slope 421 corresponding to the first slope 2211 of the third engagement projection 221 is formed at the front end of the push projection 42 of the plunger 4 , and a third engagement projection is formed at the rear end of the pull projection 43 of the plunger 4 . A fourth slope 431 corresponding to the second slope 2212 of 221 is formed.

The lock mechanism 6 includes a tubular pressing tube 61 , a tubular regulating tube 62 , a tubular locking tube 63 , a third coil spring 64 , a tubular cover member 65 and a fourth coil spring 66 . and

The barrel member 2 is housed inside the pressing tube 61 so as to be movable back and forth. A through groove 611 extending in the axial direction is formed in the outer surface of the pressing tube 61 . On the outer surface of the front end portion of the pressing tube 61, there is formed a fourth engagement projection 612 which is shaped like a beam and can be elastically deformed inward and outward. A rectangular opening 651 corresponding to the fourth engaging projection 612 of the pressing tube 61 is formed on the outer surface of the cover member 65 . The fourth engaging projection 612 of the pressing tube 61 protrudes through the opening 651 of the cover member 65 so that the cover member 65 is fitted to the outer surface of the front end portion of the pressing tube 61 so as to be movable back and forth. . A fourth coil spring 66 is arranged inside the cover member 65 to exert a biasing force between the pressing tube 61 and the cover member 65 . The cover member 65 partially protrudes from the open end of the body member 1 .

The rear end of the pressing tube 61 accommodates the front end of the regulating tube 62 and is integrally attached to the regulating tube 62 . The plunger 4 is housed inside the locking tube 63 in the pre-use state shown in FIG. A rear end portion of the locking tube 63 is fixed to the bottom portion of the body member 1 . The outer surface of locking tube 63 is partially surrounded by regulating tube 62 . The regulation tube 62 and locking tube 63 are arranged inside the third coil spring 64 . The third coil spring 64 is arranged to bias the regulation tube 62 and thus the pressing tube 61 forward against the bottom of the body member 1 .

Referring particularly to FIG. 6, the front portion of the locking tube 63 is provided with a plurality of second locking pieces 631 that can be elastically deformed inwardly and outwardly. A second locking portion 6311 is formed on the inner surface of each of the second locking pieces 631 . A restricting portion 6312 is provided at the front end of each second locking piece 631 so as to expand outward.

The generation of the start sound and the end sound will be described with reference to FIGS. 8 and 9. FIG.

FIG. 8 is a partial vertical cross-sectional view for explaining the generation of the start sound. FIG. 8(A) shows the state before use shown in FIG. FIG. 8B shows the state immediately after the locking of the plunger 4 by the lock mechanism 6 is released.

In FIG. 8A, the rear end portion of the barrel member 2 and the front end portion of the lock tube 63 are in contact with each other. That is, the first locking piece 23 of the barrel member 2 is inside the second locking piece 631 of the locking tube 63 . The outer side of the abutting portion between the barrel member 2 and the locking tube 63 is surrounded by the regulating tube 62 . A first locking portion 231 is formed on the inner surface of the first locking piece 23 . A restricting surface 621 facing forward is formed on the inner surface of the restricting tube 62 and contacts the restricting portion 6312 of the second locking piece 631 of the locking tube 63 . The first locking portion 231 of the first locking piece 23 and the second locking portion 6311 of the second locking piece 631 are fitted into the second annular concave portion 41 while abutting in the axial direction.

The second locking piece 631 can be locked with the second annular recess 41 , more specifically with the wall surface 411 on the rear side of the second annular recess 41 . At this time, a component of force due to the inclination of the contact surface between the second locking piece 631 and the second annular recess 41 acts on the second locking piece 631 to expand outward. However, the outward movement of the second locking piece 631 is restricted by the contact between the restricting portion 6312 and the restricting surface 621 . As a result, forward movement of the plunger 4 urged by the first coil spring 5 is locked by the lock mechanism 6 .

Furthermore, in this state, the regulation tube 62 is urged forward by the third coil spring 64 . Therefore, the restricting surface 621 of the restricting tube 62 presses the second locking piece 631 inward by coming into contact with the restricting portion 6312 of the locking tube 63 . As a result, the second locking portion 6311 can be locked to the second annular recessed portion 41 more strongly.

FIG. 8B shows the state immediately after the locking of the second locking piece 631 of the locking tube 63 with respect to the second annular recess 41 of the plunger 4 is released. Referring also to FIG. 1 together with FIG. 8, when using the automatic injection training device 100, the user grips the body member 1 and presses the cover member 65 protruding from the body member 1 against a target such as an arm. When the cover member 65 is pushed, the push tube 61 is pushed rearward through the cover member 65 and moves. When the pressing tube 61 moves rearward, the regulation tube 62 integrally attached to the pressing tube 61 moves rearward. As a result, the restriction on the outward movement of the second locking piece 631 due to the contact between the restricting portion 6312 of the locking tube 63 and the restricting surface 621 of the restricting tube 62 is released, and the second locking piece 631 is released. It becomes elastically deformable outward. The second locking piece 631 disengages from the second annular recessed portion 41 by acting on the second locking piece 631 with an outwardly expanding component of force, and the second locking piece 631 is disengaged from the second annular recessed portion 41 of the plunger 4 . The locking of the locking piece 631 is released. In other words, the engagement of the plunger 4 by the lock mechanism 6 is released.

The moment the locking of the plunger 4 by the lock mechanism 6 is released, the plunger 4 moves forward due to the biasing force of the first coil spring 5 . At this time, the rear wall surface 411 in the second annular recessed portion 41 that is the first collision portion provided in the body member 1 and the rear end portion of the barrel member 2 that is the second collision portion, that is, the first locking The piece 23 collides with the first locking portion 231, and a collision sound is generated (FIG. 8(B)). This impact sound is recognized by the user as the start sound of the automatic injection training device 100 . After generating the impact sound, the second annular recess 41 of the plunger 4 elastically deforms the first locking piece 23 outward and moves further forward.

FIG. 9 is a partial vertical cross-sectional view for explaining the generation of the ending sound. FIG. 9(A) shows the state before use shown in FIG. In FIG. 9A, while the collision member 22 is biased forward by the second coil spring 24, the third engagement projection 221 of the collision member 22 is locked to the engagement step 2111 in the gap 211. there is

When the plunger 4 moves forward from the state before use shown in FIG. collaborate. That is, the third inclined surface 421 of the push projection 42 engages with the first inclined surface 2211 of the collision member 22, and the collision member 22 receives a component of force in the circumferential direction and rotates around the axis. That is, the collision member 22 rotates in the direction in which the engagement between the third engagement protrusion 221 and the engagement step 2111 is released. At the moment when the engagement between the third engaging projection 221 and the engaging step 2111 is released, the biasing force of the second coil spring 24 causes the collision member 22 to move forward. At this time, the front end surface of the collision member 22 collides with the front wall surface 212 of the first annular concave portion 21, which is the third collision portion provided in the main body member 1, and a collision sound is generated (see FIG. 9 ( B)). This collision sound is recognized by the user as the end sound of the automatic injection training device 100 .

As described above, the automatic injection training device 100 can be used by the user, from the pre-use state shown in FIG. When the cover member 65 protruding from is pressed, the start sound is generated through the operation start state shown in FIG. Next, when the end sound is generated and the user who has recognized the end sound releases the automatic injection training device 100 from the target, that is, when the pressure is released, the state transitions to the state shown in FIG. 3 as described later.

The plunger 4 unlocked by the lock mechanism 6 moves forward in the body member 1 together with the piston 3 . Frictional resistance is generated between the outer surface of the plunger 4 and the second locking portion 6311 of the second locking piece 631 during the forward movement of the plunger 4 . Further, when the plunger 4 advances beyond the locking tube 63 , more specifically, when the rear end of the plunger 4 advances beyond the second locking portion 6311 of the second locking piece 631 , the second locking portion 6311 moves forward. It becomes possible for the stop piece 631 to deform inward. As a result, the urging force of the third coil spring 64 causes the regulating tube 62 to deform the second locking piece 631 inward, namely, the inner surface of the regulating tube 62 and the regulating portion 6312 of the second locking piece 631 . and moves forward together with the pressing tube 61 against the frictional resistance between them. Further, by forming the piston 3 with an elastic member, frictional resistance is also generated between the piston 3 and the inner surface of the barrel member 2 as the plunger 4 advances.

As a result of these frictional resistances, the biasing force of the first coil spring 5 is attenuated like a damper, and the advancing speed of the piston 3 is adjusted, so that the movement of the piston 3 imitates delivery of the drug solution by an actual automatic injection device. is simulated. A user can visually recognize the movement of the piston 3 through the window hole 13 formed in the body member 1 . The forward movement of the pressing tube 61 and the restricting tube 62 is restricted by engaging the rear part of the through groove 611 of the pressing tube 61 with the first engaging projection 11 of the body member 1 .

When the user releases the automatic injection training device 100 from the target, that is, when the pressure is released, the biasing force of the first coil spring 5 via the piston 3 and the biasing force of the third coil spring 64 via the regulation tube 62 are applied. The force causes the push tube 61 to move forward. At this time, the fourth engaging projection 612 of the pressing tube 61 engages with the second engaging projection 12 of the main body member 1 and is elastically deformed inward. Substantially simultaneously with the generation of the ending sound, the fourth engaging projection 612 of the pressing tube 61 exceeds the second engaging projection 12 of the main body member 1 (FIG. 3). In other words, the positions and shapes of the second engaging projection 12 and the fourth engaging projection 612 are configured such that the fourth engaging projection 612 exceeds the second engaging projection 12 . The elastically deformed fourth engaging projection 612 returns to its original shape the moment it passes over the second engaging projection 12 of the main body member 1 . Therefore, in the state after use shown in FIG. 3, the fourth engaging projection 612 is locked to the second engaging projection 12, and the pressing tube 61 and cover member 65 cannot move rearward. Thereby, it is possible to reproduce a mechanism similar to a mechanism for preventing reuse of a used injection needle in an actual automatic injection device.

The autoinjector training device 100, unlike a real autoinjector, must be reinitializable (resettable) for training purposes so that it can be used many times. Therefore, the initialization device 8 of the automatic injection training device 100 will be described with reference to FIGS. 10 to 12. FIG. 11 and 12, the automatic injection training device 100 is inserted into the initialization device 8. As shown in FIG. In the axial direction of the initialization device 8, the direction in which the automatic injection training device 100 advances during insertion (lower in the figure) is defined as the "front" side, and the opposite side (upper in the figure) is defined as the "rear" side. .

FIG. 10 is an exploded view of the initialization device 8 of the automatic injection training device 100. As shown in FIG. 11 is a longitudinal sectional view of the initialization device 8 before use, and FIG. 12 is a longitudinal sectional view of the initialization device 8 after use.

The initialization device 8 has a tubular base member 81 with an open rear end, a vertical rod member 82 , a compression tube 83 , a fifth coil spring 84 and a pin 85 . The base member 81 is configured so that the entire initialization device 8 can stand on its own. A front end portion of the vertical rod member 82 is fixed to the bottom portion of the base member 81 . A longitudinal hole 821 extending in the axial direction and penetrating to the opposite side is formed in the front half of the longitudinal rod member 82 . The compression tube 83 has a through hole formed at its front end to which a pin 85 can be attached. A flange portion 831 and two pressing plates 832 extending rearward from the flange portion 831 are formed at the rear portion of the compression tube 83 .

Vertical rod member 82 is inserted into compression tube 83 . At this time, the pin 85 is attached to the compression tube 83 through the vertical hole 821 of the vertical rod member 82 . Therefore, the compression tube 83 can move back and forth within the range where the pin 85 is restricted by the vertical hole 821 . The fifth coil spring 84 is arranged between the bottom portion of the base member 81 and the flange portion 831 of the compression tube 83 and biases the compression tube 83 rearward.

11 is a longitudinal sectional view of the initialization device 8 before use, and FIG. 12 is a longitudinal sectional view of the initialization device 8 after use.

When using the initialization device 8 , first, the front end is inserted into the rear end of the placed initialization device 8 while holding the automatic injection training device 100 . Specifically, the cover member 65 is inserted between the two pressing plates 832 inside the base member 81 , and the front end surface of the cover member 65 is brought into contact with the inner surface of the flange portion 831 of the compression tube 83 . At this time, the pressing plate 832 is arranged to face the fourth engaging projection 612 of the pressing tube 61, and the vertical rod member 82 enters the automatic injection training device 100 through the opening of the front end surface of the cover member 65. inserted (Fig. 11).

The autoinjector training device 100 is then pushed against the initialization device 8 . As a result, the pressing plate 832 elastically deforms the fourth engaging projection 612 of the pressing tube 61 inward, and the lock between the fourth engaging projection 612 and the second engaging projection 12 of the main body member 1 is released. be. As a result, it becomes possible to move the cover member 65 and, in turn, the pressing tube 61 rearward.

Next, when the automatic injection training device 100 is pushed further, the vertical rod member 82 of the initialization device 8 presses the piston 3 and the plunger 4 against the biasing force of the first coil spring 5 and moves backward. When the plunger 4 moves rearward, the pull projection 43 of the plunger 4 cooperates with the third engagement projection 221 of the collision member 22 projecting inward through the gap 211, and the biasing force of the second coil spring 24 is applied. to move the collision member 22 rearward. When the third engaging projection 221 of the collision member 22 moves backward in the gap 211 until it exceeds the engaging step 2111 , the fourth slope 431 of the pull projection 43 engages the second slope 2212 of the collision member 22 . Then, the collision member 22 rotates around the axis by receiving a component force in the circumferential direction. That is, the collision member 22 rotates in the direction in which the third engaging protrusion 221 and the engaging step 2111 are locked. As a result, the collision member 22 returns to the initial position (FIG. 9(A)).

Next, when the automatic injection training device 100 is pushed further, the vertical rod member 82 of the initialization device 8 further presses the plunger 4 to move backward. At this time, the pressing tube 61 and the regulating tube 62 move rearward against the urging force of the third coil spring 64, and the engagement with the inner surface of the pressing tube 61 causes the barrel member 2 to move rearward. The first locking piece 23 of the barrel member 2 that has moved rearward enters the inside of the second locking piece 631 of the locking tube 63 . At this time, the first locking portion 231 of the first locking piece 23 and the second locking portion 6311 of the second locking piece 631 are fitted into the second annular concave portion 41 of the plunger 4 and are in the initial position (FIG. 8). (A)). As a result, the initialization of the automatic injection training device 100 is completed.

According to the automatic injection training device 100, before use, the plunger 4 is locked at the rear position within the main body member 1 against the biasing force of the first coil spring 5, and the locking of the plunger 4 is released. When the plunger 4 starts to move, a start sound is emitted, and when the plunger 4 finishes moving, an end sound is emitted. Thus, audible feedback can be provided to the user both at the beginning and at the end of motion. Therefore, the user can recognize the operation status of the automatic injection training device 100, and can train the automatic injection device with peace of mind. Further, since the automatic injection training device 100 can be easily initialized by the initialization device 8, the user can repeatedly train the automatic injection device.

An automatic injection training device, comprising a cylindrical body member, a plunger arranged to be movable back and forth within the body member, and a first elastic member that biases the plunger forward, and in a state before use, The plunger is locked at the rear position within the main body member against the biasing force of the first elastic member, and when the locking of the plunger is released, a start sound is generated as the plunger starts to move, and the movement of the plunger ends. Any configuration can be adopted as long as the end sound is emitted along with . For example, in the above-described embodiment, the plunger 4 is locked by the plurality of second locking pieces 631 and the second annular recess 41 being locked. It may be locked with a recess that does not have a recess. Further, although the collision member 22 is an annular member, the collision member may be a C-shaped member instead of a complete annular member. Additionally, there may be any arrangement of the first impact portion of the plunger and the second impact portion within the body member that may produce the initiation sound. Furthermore, a third collision part that collides with the collision member, which can generate an end sound, may be arranged arbitrarily.

In the above-described embodiment, the start sound and the end sound are generated by the collision between the parts. It is also possible to generate other identification signals such as light, sound, or the like.

1 Body Member 2 Barrel Member 3 Piston 4 Plunger 5 First Coil Spring 6 Locking Mechanism 7 Guide Rod 8 Initializing Device 11 First Engaging Protrusion 12 Second Engaging Protrusion 13 Window Hole 21 First Annular Recess 22 Impact Member 23 Second 1 locking piece 24 second coil spring 41 second annular recess 42 push projection 43 pull projection 61 push tube 62 regulation tube 63 locking tube 64 third coil spring 65 cover member 66 fourth coil spring 81 base member 82 vertical rod member 83 compression tube 84 fifth coil spring 85 pin 100 automatic injection training device

Claims (8)

a tubular body member;
a plunger arranged to be movable back and forth within the body member;
a first elastic member that biases the plunger forward;
In a state before use, the plunger is locked at a rear position within the body member against the biasing force of the first elastic member;
A start sound is emitted as the plunger starts to move due to the unlocking of the plunger,
The automatic injection training device is characterized in that an end sound is emitted upon completion of movement of the plunger, wherein the plunger has a first impact portion, and the first impact portion is provided within the body member. The automatic injection training device, wherein the starting sound is emitted by colliding with the second colliding portion, and the first colliding portion is a recess provided on the outer surface of the plunger . 2. The automatic injection training device of claim 1 , wherein locking of the plunger is provided by the recess. The collision member is further provided so as to be movable back and forth within the main body member, the movement of the collision member is started in accordance with the movement of the plunger, and the collision member is a third collision member provided within the main body member. 3. An automatic injection training device according to claim 1 or 2 , wherein said ending sound is emitted by colliding with a part. 4. The autoinjection training device of claim 3 , wherein said impingement member is an annular member. A first projection is formed on the inner surface of the annular member, a second projection is formed on the side surface of the plunger, and the first projection and the second projection cooperate to initiate movement of the collision member. An automatic injection training device according to claim 4 . 6. The barrel member according to any one of claims 1 to 5 , further comprising a cylindrical barrel member, wherein frictional resistance is generated between the outer surface of the plunger and the inner surface of the barrel member when the plunger moves. automatic injection training device. a tubular body member;
a plunger arranged to be movable back and forth within the body member;
a first elastic member that biases the plunger forward;
In a state before use, the plunger is locked at a rear position within the body member against the biasing force of the first elastic member;
A start sound is emitted as the plunger starts to move due to the unlocking of the plunger,
The automatic injection training device is characterized in that an end sound is emitted upon completion of movement of the plunger, further comprising a collision member disposed so as to be movable back and forth within the main body member, the impact member being arranged to move back and forth along with the movement of the plunger. The movement of the collision member is started, and the collision member collides with a third collision portion provided in the main body member, whereby the end sound is emitted, the collision member is an annular member, and the annular wherein a first projection is formed on the inner surface of the member and a second projection is formed on the side of the plunger, the first projection and the second projection cooperating to initiate movement of the impact member; Injection training device. 8. The automatic injection training device according to claim 7, further comprising a tubular barrel member, wherein frictional resistance is generated between the outer surface of the plunger and the inner surface of the barrel member when the plunger is moved.

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