Injection device

Abstract

The application relates to the technical field of medical devices, and provides an injection device, which comprises a containing part and an injection part, the containing part is used for containing a medicament, the injection part comprises a first pipe body, a pipe body assembly, a limiting ring and a first limiting piece; the pipe body assembly is threadedly connected with the first pipe body; the outer wall of the limiting ring is clamped with the inner wall of the pipe body assembly; the first limiting piece is threadedly connected with the limiting ring; when the pipe body assembly is unscrewed relative to the first pipe body, the limiting ring can be axially moved relative to the first limiting piece to memorize the adjusted amount of the medicament; one end of the first limiting piece is provided with a first stopper which is used for limiting the unscrewing of the limiting ring. The injection device has the advantages that the axial movement of the limiting ring is limited, the set dose in the last injection is smaller than the residual amount of the medicament in the containing part, the problem that the actual injection dose is smaller than the set dose is avoided, and the treatment effect is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to an injection device. BACKGROUND

[0002] A common disposable manual injection device, when in use, first needs to rotate an adjusting rod to set the dose to be injected, when rotating the adjusting rod, the adjusting rod will extend out of the pen body, then the needle is inserted into the injection site, and finally the button on the adjusting rod is pressed with force, the internal threads of the pen convert the hand pressure into the thrust of the piston rod, and the injection is completed by the action of the piston rod. When the last injection is performed, if the dose of the medicament in the injection device is less than the set dose, it is easy to appear that the set dose is greater than the actual injection dose, which reduces the treatment effect. SUMMARY

[0003] The present application provides an injection device to solve the defect that the injection device in the prior art is prone to have a set dose greater than the actual injection dose when the last injection is performed.

[0004] The present application provides an injection device, comprising: a containing part and an injection part, the containing part is provided with a containing cavity, the containing cavity is used for containing a medicament, and the injection part comprises: a first tube body; a tube body assembly, which is sleeved in the first tube body and is in threaded connection with the first tube body; a limiting ring, which is arranged in the tube body assembly, and the outer wall of the limiting ring is in clamping connection with the inner wall of the tube body assembly; and a first limiting piece, which is arranged in the tube body assembly and is in threaded connection with the limiting ring, when the tube body assembly is rotated out relative to the first tube body, the limiting ring can move axially relative to the first limiting piece to memorize the adjusted amount of the medicament, and one end of the first limiting piece is provided with a first stop block, which is used for limiting the rotation of the limiting ring.

[0005] According to the injection device provided by the present application, the injection device further comprises: a second limiting piece, which is arranged in the first tube body, the first end of the second limiting piece is connected with the containing part, the second end of the second limiting piece is opposite to the tube body assembly, the second end of the second limiting piece is provided with a ratchet, and a second tube body, which is sleeved in the first limiting piece and can slide linearly relative to the first limiting piece, the first end of the second tube body is provided with a ratchet piece; when the injection device is in a medicament adjusting state, the ratchet piece is in clamping connection with the ratchet, and the second tube body cannot rotate; when the injection device is in a medicament injection state, the tube body assembly drives the first limiting piece to rotate in the direction close to the containing part, the first limiting piece drives the second tube body to rotate in the direction close to the containing part, and the ratchet piece passes over the ratchet to emit a first sound.

[0006] According to the injection device provided by the application, the third tube body is sleeved in the first tube body and is threadedly connected with the first tube body, and the outer wall of the limiting ring is clamped with the inner wall of the third tube body.

[0007] According to the injection device provided by the application, one end of the third tube body is provided with a second stop block, and the end surface of the first tube body is provided with a locking groove, when the third tube body is screwed into the first tube body, the second stop block can be matched with the locking groove to limit the movement of the third tube body.

[0008] According to the injection device provided by the application, one end of the third tube body is provided with a second stop block, and the end surface of the first tube body is provided with a locking groove, when the third tube body is screwed into the first tube body, the second stop block can be matched with the locking groove to limit the movement of the third tube body.

[0009] According to the injection device provided by the application, the third tube body is sleeved in the first tube body and is threadedly connected with the first tube body, and the outer wall of the limiting ring is clamped with the inner wall of the third tube body.

[0010] According to the injection device provided by the application, the third tube body is sleeved in the first tube body and is threadedly connected with the first tube body, and the outer wall of the limiting ring is clamped with the inner wall of the third tube body.

[0011] According to the injection device provided by the application, the third tube body is sleeved in the first tube body and is threadedly connected with the first tube body, and the outer wall of the limiting ring is clamped with the inner wall of the third tube body.

[0012] According to the injection device provided by the application, the third tube body is sleeved in the first tube body and is threadedly connected with the first tube body, and the outer wall of the limiting ring is clamped with the inner wall of the third tube body.

[0013] According to the injection device provided by the application, the third tube body is sleeved in the first tube body and is threadedly connected with the first tube body, and the outer wall of the limiting ring is clamped with the inner wall of the third tube body.

[0014] The injection device provided by the application can limit the axial direction of the limiting ring through the limiting ring, the first limiting member and the first stopper, so that the set dose in the last injection is smaller than the remaining medicine in the accommodating portion, the problem that the actual injection dose is smaller than the set dose is avoided, and the treatment effect is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0016] Figure 1 Fig. 1 is a structural schematic diagram of the injection device provided by the application;

[0017] Figure 2 Fig. 2 is an exploded view of the injection device provided by the application;

[0018] Figure 3 Fig. 3 is a structural schematic diagram of the second pipe body and the limiting member shown in Fig. 1; Figure 2

[0019] Fig. 4 is a structural schematic diagram of the rod body and the pressing block shown in Fig. 1; Figure 4 Figure 2 Fig. 5 is a structural schematic diagram of the third pipe body shown in Fig. 1;

[0020] Figure 5 Figure 2 Fig. 6 is an enlarged view of B shown in Fig. 1;

[0021] Figure 6 Fig. 7 is an enlarged view of A shown in Fig. 1; Figure 2

[0022] Fig. 8 is a structural schematic diagram of the first limiting member shown in Fig. 1; Figure 7 Figure 5 Fig. 9 is a structural schematic diagram of the second pipe body shown in Fig. 1;

[0023] Figure 8 Figure 2 Fig. 10 is a structural schematic diagram of the first limiting member shown in Fig. 1;

[0024] Figure 9 Fig. 11 is a structural schematic diagram of the second pipe body shown in Fig. 1; Figure 2 Reference signs:

[0025]

[0026] ​​​​​10: First tube body; 11: Display window; 12: Locking groove; 20: Second tube body; 21: Ratchet piece; 22: First plane; 23: Stop block; 31: Third tube body; 32: Limiting ring; 33: First limiting member; 40: Second limiting member; 41: Ratchet; 50: Rod body; 51: Second plane; 52: Key; 60: Pressing block; 71: Fourth tube body; 72: Fifth tube body; 73: Sixth tube body; 80: Button portion; 81: Connecting shaft; 82: Elastic member; 83: End cover; 311: Second stop block; 312: Annular boss; 313: Second tooth; 331: First tooth; 333: First stop block; 731: Accommodating chamber; 811: First boss; 812: Flange; 813: Second boss. DETAILED DESCRIPTION

[0027] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0028] The features of the terms "first" and "second" in the description and claims of the present invention may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0029] The following combination Figures 1-9 The injection device of the present invention is described.

[0030] like Figure 1 and Figure 2 As shown, in an embodiment of the present invention, the injection device includes: a accommodating portion and an injection portion, the accommodating portion is provided with a accommodating cavity 731, the accommodating cavity 731 is used to accommodate medicine, the injection portion is used to inject medicine, the injection portion includes: a first tube body 10, a tube body assembly, a limiting ring 32 and a first limiting member 33, the tube body assembly is sleeved in the first tube body 10 and is threadedly connected to the first tube body 10, the limiting ring 32 is provided in the tube body assembly, the outer wall of the limiting ring 32 is clamped with the inner wall of the tube body assembly, the first limiting member 33 is provided in the tube body assembly, the first limiting member 33 is threadedly connected to the limiting ring 32, when the tube body assembly is screwed out relative to the first tube body 10, the limiting ring 32 can move axially relative to the first limiting member 33 to memorize the adjusted amount of the medicine, and a first stopper 333 is provided at one end of the first limiting member 33, the first stopper 333 is used to limit the screwing out of the limiting ring 32.

[0031] Specifically, the accommodation cavity 731 contains a drug liquid, and the dose of the drug to be injected needs to be set before injection. When the tubular body assembly is rotated outwards relative to the first tubular body 10, the limiting ring 32 is driven to rotate relative to the first limiting member 33, and the number of threads of the limiting ring 32 after rotation represents a certain dose. When the drug liquid in the accommodation cavity 731 is less than the set dose to be injected during the last injection, the limiting ring 32 is rotated to the first stop block 333, and the first stop block 333 limits the rotation of the limiting ring 32, preventing the limiting ring 32 from continuing to rotate, thereby limiting the adjustment amount of the dose of the drug, preventing the adjusted dose from reaching the set dose, and causing the actual injection dose to be less than the set dose.

[0032] For example, if the maximum dose of the injection device is 0.8 ml, the dose of the drug liquid in the accommodation cavity 731 is only 0.3 ml during the last injection of the injection device, and the set dose to be injected is 0.5 ml. When the tubular body assembly is rotated outwards relative to the first tubular body 10, the limiting ring 32 is driven to rotate, and when the limiting ring 32 abuts against the first stop block 333, the limiting ring 32 cannot move. At this time, the actual injection dose is 0.3 ml. In the prior art, when the tubular body assembly is rotated outwards relative to the first tubular body 10, the dose to be injected can still be adjusted to 0.8 ml, and at this time, the actual injection dose will be less than the set dose, which reduces the treatment effect.

[0033] The injection device provided by the embodiment of the present application can limit the axial movement of the limiting ring by setting the limiting ring, the first limiting member, and the first stop block, so that the set dose during the last injection is less than the remaining amount of the drug in the accommodation portion, the problem of the actual injection dose being less than the set dose is avoided, and the treatment effect is ensured.

[0034] As shown in FIGS. Figure 1 and Figure 2 In the embodiment of the present application, the injection device further comprises a second tubular body 20 and a second limiting member 40. The second limiting member 40 is arranged in the first tubular body 10, the first end of the second limiting member 40 is connected with the accommodation portion, the second end of the second limiting member 40 is opposite to the tubular body assembly, and the second end of the second limiting member 40 is provided with a ratchet 41. The second tubular body 20 is sleeved in the first limiting member 33 and can linearly slide relative to the first limiting member 33, and the first end of the second tubular body 20 is provided with a ratchet piece 21. When the injection device is in the drug adjustment state, the ratchet piece 21 is clamped with the ratchet 41, and the second tubular body 20 cannot rotate. When the injection device is in the drug injection state, the tubular body assembly drives the first limiting member 33 to rotate towards the accommodation portion, the first limiting member 33 drives the second tubular body 20 to rotate towards the accommodation cavity, the ratchet piece 21 passes over the ratchet 41, and a first sound is emitted.

[0035] Specifically, for ease of description, in the present application, outward movement represents movement in a direction away from the accommodation portion, and inward movement represents movement in a direction close to the accommodation portion.

[0036] As shown in Figure 3 embodiment, the second tubular body 20 is connected with the first limiting member 33 through a spline connection, the second tubular body 20 cannot rotate relative to the first limiting member 33, but can linearly slide relative to the first limiting member 33. When the injection device is in the medicament adjusting state, the tubular body assembly is rotated out relative to the first tubular body 10, and the force in the longitudinal direction when the tubular body assembly rotates out can drive the first limiting member 33 to linearly move outward. At this time, since the first limiting member 33 does not rotate, the ratchet piece 21 of the second tubular body 20 is clamped with the ratchet 41 of the second limiting member 40, and the second tubular body 20 cannot rotate, thereby avoiding the rotation of the second tubular body 20 relative to the first tubular body 10 in the medicament adjusting stage. When the injection device is in the medicament injection state, the tubular body assembly is rotated in, driving the first limiting member 33 to rotate inward, the first limiting member 33 drives the second tubular body 20 to rotate inward, and the ratchet piece 21 passes the ratchet 41, and a first sound is emitted to prompt the user that the injection device is in the injection stage.

[0037] As shown in Figure 4 embodiment, the injection device further comprises a rod body 50 and a pressing block 60. The rod body 50 is sleeved in the second tubular body 20, one end of the rod body 50 penetrates through the second limiting member 40 and is threadedly connected with the second limiting member 40, and the rod body 50 can move in a direction close to the accommodation portion when the second tubular body 20 rotates. The pressing block 60 is connected with the rod body 50, and the pressing block 60 is used to push the medicament for injection.

[0038] Specifically, in the present embodiment, the rod body 50 is sleeved with the second tubular body 20, and the rod body 50 and the second tubular body 20 cannot relatively rotate. When the injection device is in the medicament injection state, the tubular body assembly is rotated in, driving the first limiting member 33 to rotate inward, the first limiting member 33 drives the second tubular body 20 to rotate inward, the rod body 50 drives the pressing block 60 to move inward, the pressing block 60 abuts against the piston block in the accommodation cavity 731, and the medicament is pushed for injection.

[0039] As shown in Figure 5 embodiment, the tubular body assembly comprises a third tubular body 31, the third tubular body 31 is sleeved in the first tubular body 10, the third tubular body 31 is threadedly connected with the first tubular body 10, and the outer wall of the limiting ring 32 is clamped with the inner wall of the third tubular body 31. The first end of the third tubular body 31 is provided with an annular boss 312, and the annular boss 312 is provided with a second stop block 311 facing the end face of the first tubular body 10. The end face of the first tubular body 10 is provided with a locking groove 12, and the second stop block 311 cooperates with the locking groove 12 to limit the movement of the third tubular body 31, wherein the annular boss 312 is located outside the first tubular body 10.

[0040] Specifically, the outer surface of the third tube body 31 is provided with external threads to be screwed with the first tube body 10. Figure 6 As shown, the end surface of the end of the first tube body 10 not connected with the accommodating portion is provided with protrusions, and locking grooves 12 are formed between adjacent protrusions. When the third tube body 31 is completely screwed into the first tube body 10, the second stopper 311 cooperates with the locking grooves 12 to limit the screwing of the third tube body 31, thereby preventing the third tube body 31 from being screwed with the first tube body 10 and further preventing the subsequent unscrewing process from being difficult to operate.

[0041] Further, as shown, the first tube body 10 is further provided with a display window 11, and the outer surface of the third tube body 31 is provided with a scale. When the third tube body 31 is unscrewed relative to the first tube body 10, the display window 11 is used to display the scale on the third tube body 31 to display the adjusted dose. Figure 6 As shown, the annular boss 312 is provided with a second tooth 313 close to the end surface of the first tube body 10. As shown, one end of the first limiting member 33 is provided with a first tooth 331. When the injection device is in the medicament adjusting state, the first tooth 331 passes the second tooth 313.

[0042] Figure 7 As shown, the annular boss 312 is provided with a second tooth 313 close to the end surface of the first tube body 10. As shown, one end of the first limiting member 33 is provided with a first tooth 331. When the injection device is in the medicament adjusting state, the first tooth 331 passes the second tooth 313. Figure 8 Specifically, when the injection device is in the medicament adjusting state, the third tube body 31 is unscrewed relative to the first tube body 10, and the third tube body 31 drives the limiting ring 32 to rotate to adjust the set dose. The force in the longitudinal direction when the third tube body 31 rotates outward can drive the first limiting member 33 to move linearly outward, thereby causing the first tooth 331 to pass the second tooth 313 to produce a second sound to remind the user that it is in the medicament adjusting stage.

[0043] As shown, in the embodiment of the present application, the opposite two surfaces of the second tube body 20 are first planes 22, the first planes 22 are provided with stoppers 23, the first limiting member 33 is provided with clamping grooves, and the stoppers 23 are clamped with the clamping grooves.

[0044] Figure 9 Specifically, in this embodiment, the inner wall of the first limiting member 33 is provided with a plurality of clamping grooves, and the outside is not connected, thereby increasing the strength of the first limiting member 33. The first plane 22 of the second tube body 20 is provided with a plurality of stoppers 23, and the stoppers 23 are clamped with the clamping grooves, so that the second tube body 20 and the first limiting member 33 cannot rotate relative to each other.

[0045] Further, as shown, the outer wall of the rod body 50 is provided with external threads, and the opposite two surfaces of the rod body 50 are second planes 51, and the second planes 51 are opposite to the first planes 22.

[0046] Further, as shown, the outer wall of the rod body 50 is provided with external threads, and the opposite two surfaces of the rod body 50 are second planes 51, and the second planes 51 are opposite to the first planes 22. Figure 4

[0047] ​​​Specifically, the rod body 50 is sleeved in the second tube body 20, and the second plane 51 of the rod body 50 is opposite to the first plane 22 of the second tube body 20. The rod body 50 is provided with a key 52, and the second tube body 20 is provided with a groove. The key 52 is clamped with the groove, so that when the second tube body 20 rotates, the rod body 50 can be driven to rotate together, and then axial displacement occurs, and the rod body 50 cannot rotate relative to the second tube body 20.

[0048] As shown in Figure 1 and Figure 2 shown, in the embodiment of the present application, the injection device further comprises a button part 80, the button part 80 comprising a connecting shaft 81, an elastic member 82 and an end cover 83.

[0049] Specifically, as shown in Figure 2 , the connecting shaft comprises a flange plate 812 and first and second bosses 811 and 813 located on both sides of the flange plate 812, and at least part of the connecting shaft 81 is located in the annular boss 312 of the third tube body 31. The second boss 813 is externally sleeved with the elastic member 82, and when the injection device is in the medicine adjusting state, the first limiting member 33 pushes the button part 80 to move away from the first tube body 10. The end cover 83 is sleeved on the outside of the elastic member 82, and the end cover 83 is used to push the first limiting member 33 to move by using the elastic force of the elastic member 82 when pressed, so that the first teeth 331 engage with the second teeth 313.

[0050] Specifically, when the injection device is in the medicine injection state, the end cover 83 is pressed, the end cover 83 extrudes the elastic member 82, the elastic member 82 pushes the connecting shaft 81 to move towards the accommodating part, the flange plate 812 of the connecting shaft 81 abuts against the end face of the first limiting member 33, the first limiting member 33 is pushed to move inward, and then the first teeth 331 of the first limiting member 33 engage with the second teeth 313 of the third tube body 31. When the third tube body 31 is screwed into the first tube body 10, the third tube body 31 drives the first limiting member 33 to rotate, the first limiting member 33 drives the second tube body 20 to rotate, and the rod body 50 moves towards the accommodating cavity 731.

[0051] As shown in Figure 2 , in the embodiment of the present application, the accommodating part comprises a fourth tube body 71 and a sixth tube body 73. The first end of the fourth tube body 71 is connected with the first tube body 10, and the second end of the fourth tube body 71 is used to be detachably connected with the injection needle. The sixth tube body 73 is sleeved in the fourth tube body 71, the inner cavity of the sixth tube body 73 is the accommodating cavity 731, the first end of the sixth tube body 73 is an open end, so that the pressing block 60 can extend into the accommodating cavity 731, and the second end of the sixth tube body 73 communicates with the injection needle.

[0052] Specifically, the sixth tube body 73 has an open end opposite to the injection part, so that the pressing block 60 can enter the sixth tube body 73 and abut against the piston in the sixth tube body 73, thereby pushing the piston to move to inject the medicament.

[0053] Further, the accommodating part further comprises a fifth tube body 72, which is used to cover the outside of the fourth tube body 71 when the injection device is not used.

[0054] Specifically, the injection needle is detachably connected with the fourth tube body 71, and the injection needle is discarded when the injection device is not used, and the fifth tube body 72 covers the outside of the fourth tube body 71.

[0055] The use process of the injection device provided by the embodiment of the present application will be described in detail below with reference to the embodiment shown in the accompanying drawings. Figure 1

[0056] When the injection device is in the medicament adjusting state, the third tube body 31 is rotated outward, and the third tube body 31 drives the limiting ring 32 to rotate relative to the first limiting member 33 to adjust the set dose of the medicament. When the third tube body 31 is rotated outward, the force in the longitudinal direction can drive the first limiting member 33 to move linearly outward, so as to make the first teeth 331 of the first limiting member 33 pass through the second teeth 313 in the annular boss 312 of the third tube body 31, and the first limiting member 33 drives the button part 80 to move outward. In this process, the first limiting member 33 slides linearly relative to the second tube body 20, and the ratchet teeth 21 of the second tube body 20 are engaged with the ratchet teeth 41 of the second limiting member 40, so that the second tube body 20 cannot rotate, and the rod body 50 is also stationary.

[0057] When the injection device is in the medicament injecting state, the end cover 83 is pressed, the end cover 83 presses the elastic member 82, the elastic member 82 pushes the connecting shaft 81 to move towards the accommodating part by the elastic force, the flange plate 812 of the connecting shaft 81 abuts against the end surface of the first limiting member 33, thereby pushing the first teeth 331 to engage with the second teeth 313. At this time, since the third tube body 31 is connected with the first tube body 10 by the threads, the third tube body 31 is rotated inward, and the first limiting member 33 is also rotated inward, the first limiting member 33 drives the second tube body 20 to rotate inward, and the rod body 50 moves towards the accommodating cavity 731, thereby pushing the pressing block 60 to move forward to inject the medicament.

[0058] ​It should be pointed out finally that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit the same; and although the present application has been described in detail with reference to the foregoing embodiments, it should be appreciated by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features thereof can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An injection device, characterized in that The injection device comprises: a containing part provided with a containing cavity for containing a medicament, and an injection part comprising: a first tube body; a tube body assembly sleeved in the first tube body and threadedly connected with the first tube body; a limiting ring provided in the tube body assembly, an outer wall of the limiting ring being clamped with an inner wall of the tube body assembly; a first limiting piece provided in the tube body assembly, the first limiting piece being threadedly connected with the limiting ring, the limiting ring being capable of moving axially relative to the first limiting piece when the tube body assembly is screwed out relative to the first tube body, so as to memorize the adjusted amount of the medicament, one end of the first limiting piece being provided with a first stopper for limiting the screwing out of the limiting ring; a second limiting piece provided in the first tube body, a first end of the second limiting piece being connected with the containing part, a second end of the second limiting piece being opposite to the tube body assembly, the second end of the second limiting piece being provided with a ratchet; a second tube body sleeved in the first limiting piece and capable of linearly sliding relative to the first limiting piece, a first end of the second tube body being provided with a ratchet piece, opposite surfaces of the second tube body being first planes, the first planes being provided with stoppers, an inner wall of the first limiting piece being provided with clamping grooves, the stoppers being clamped with the clamping grooves; when the injection device is in a medicament adjusting state, the ratchet piece is clamped with the ratchet, the second tube body cannot rotate; when the injection device is in a medicament injecting state, the tube body assembly drives the first limiting piece to rotate towards the containing part, the first limiting piece drives the second tube body to rotate towards the containing part, the ratchet piece passes over the ratchet, and a first sound is emitted; the tube body assembly comprises a third tube body sleeved in the first tube body, the third tube body being threadedly connected with the first tube body, an outer wall of the limiting ring being clamped with an inner wall of the third tube body.

2. An injection device according to claim 1, wherein, one end of the third tube body is provided with a second stopper; an end surface of the first tube body is provided with a locking groove, the second stopper can cooperate with the locking groove when the third tube body is screwed in relative to the first tube body, so as to limit the movement of the third tube body.

3. An injection device according to claim 2, wherein, one end of the first limiting piece adjacent to the first stopper is provided with a first tooth; one end of the third tube body provided with the second stopper is provided with an annular boss, the second stopper is located at an end surface of the annular boss facing the first tube body, the annular boss is provided with a second tooth inside; when the injection device is in a medicament adjusting state, the first tooth passes over the second tooth, and a second sound is emitted.

4. The injection device of claim 1, wherein, further comprising: a rod body sleeved in the second tube body, one end of the rod body penetrating through the second limiting piece, and the rod body being threadedly connected with the second limiting piece, the rod body being capable of moving towards the containing part when the second tube body rotates; a pressing block connected with the rod body, the pressing block being used for pushing the medicament for injection.

5. The injection device of claim 3, wherein, further comprising a button part, the button part comprising: a connecting shaft, at least part of the connecting shaft being located in the annular boss. An elastic member is sleeved at one end of the connecting shaft; An end cover is sleeved outside the elastic member, and the end cover is used to push the first limiting member to move when being pressed, so that the first tooth is engaged with the second tooth.

6. The injection device of claim 4, wherein, The accommodating portion comprises: A fourth tube body, a first end of the fourth tube body is connected with the first tube body, and a second end of the fourth tube body is used to be detachably connected with the injection needle.

7. An injection device according to claim 6, wherein, The accommodating portion further comprises: A fifth tube body is used to be sleeved outside the fourth tube body when the injection device is not used.

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