Emitter and injection device

Abstract

The utility model relates to the technical field of injection devices, and provides a launcher which comprises a launch canister, the launch canister is provided with a cavity for containing an injector, and the launch canister is provided with a driving assembly used for driving the injector to slide in the cavity; the emitter further comprises a trigger assembly which can limit the injector or release the limit of the injector. The utility model further provides an injection device which comprises an injector and further comprises the emitter, and the injector is installed in the inner cavity of the emitter. The injector is launched by the launcher, the launcher can be matched with the driving assembly to drive the injector to move, in the high-speed moving process, the injector can pierce a target part, compared with a traditional operation, administration is convenient, trauma is small, compared with traditional nerve protection treatment, treatment time is short, and the launcher is simple in structure, convenient to operate and low in cost. The method is easy to implement, low in cost and capable of saving huge treatment cost for vast patients.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection device technical field, concretely is a kind of launcher and injection device. BACKGROUND

[0002] For some patients with injury in the position of body not easy to reach or treat, for example, patients suffering from ischemic stroke, the main treatment methods include two categories of vascular recanalization therapy and neuroprotective therapy. Among them, vascular recanalization therapy is generally performed by surgical method, which causes high harm to patients, and in addition, surgery needs to consume a lot of time, and the risk of patients in acute stage is great. And the neuroprotective therapy is hindered by blood-brain barrier, and it is difficult for drugs to reach the brain target via blood vessels. Whether the above method or other existing methods, there are problems of high treatment cost and great difficulty. INVENTION CONTENTS

[0003] The utility model aims at providing a kind of launcher and injection device, at least can solve part of defects in prior art.

[0004] To achieve the above object, the utility model embodiment provides the following technical scheme: a launcher, including launch cylinder, the launch cylinder has the cavity that can be loaded into its inside for injector, the launch cylinder is equipped with the drive assembly for driving the injector to slide in the cavity;The launcher further includes the trigger assembly that can limit or release the injector and the limit structure for limiting the sliding stroke of the injector, the limit structure is arranged at the end of the launch cylinder for the needle head of injector to extend, the limit structure includes limit sheet and scale ring.

[0005] Further, the trigger assembly includes a limit portion that can extend into the cavity to limit the movement of the injector, and a trigger that drives the limit portion out of the cavity.

[0006] Further, the limit portion and the trigger are both arranged on a rotating shaft, and the limit portion and the trigger rotate synchronously around the rotating shaft and in the same direction, and the rotating path of the trigger is the path of the limit portion out of or into the cavity.

[0007] Further, it further includes an unlocking assembly for releasing the movement limitation of the trigger.

[0008] Further, the unlocking assembly includes an unlocking trigger and an unlocking rod connected to the unlocking trigger, the trigger has a limit slot, and the unlocking rod has a trigger pin that can be inserted into the limit slot.

[0009] Further, a first spring is sleeved on the unlocking rod.

[0010] Further, the control assembly is further used for controlling the injection of the syringe after sliding to the position.

[0011] Further, the driving assembly comprises a second spring which is detachably installed in the inner cavity of the launching barrel.

[0012] The utility model embodiment provides another technical scheme: a kind of injection device, including syringe, further include above-mentioned launcher, the syringe is installed in the inner cavity of the launcher.

[0013] Compared with prior art, the utility model has the beneficial effects that: the launcher is used to launch the syringe, can cooperate with driving assembly to drive the syringe to move, in the process of high-speed movement, the syringe can be punctured target site, compared with traditional operation, it is convenient to administer, and trauma is small, compared with traditional nerve protection treatment, rescue time is short, and the structure of the launcher is simple, easy to realize, low in cost, can save huge treatment cost for the majority of patients. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a schematic view of launcher provided by the utility model embodiment;

[0015] Figure 2 It is a schematic view of launcher provided by the utility model embodiment;

[0016] Figure 3 It is a schematic view of launcher provided by the utility model embodiment;

[0017] Figure 4 It is a schematic view of launcher provided by the utility model embodiment;

[0018] Figure 5 It is a schematic view of launcher provided by the utility model embodiment;

[0019] Figure 6 It is a schematic view of launcher provided by the utility model embodiment;

[0020] Figure 7 It is a schematic view of launcher provided by the utility model embodiment;

[0021] Figure 8 It is a schematic view of launcher provided by the utility model embodiment; Figure 7

[0022] ​In the drawing: 1 - launcher; 10 - launching cylinder; 110 - limiting part; 111 - launching trigger; 112 - rotating shaft; 113 - limiting groove; 120 - unlocking trigger; 121 - unlocking rod; 122 - trigger pin; 123 - first spring; 130 - injection key; 131 - injection lever; 132 - injection ejector rod; 133 - torsional spring; 140 - scale ring; 141 - buffer ring; 15 - lock head; 16 - handle grip; 2 - injector; 20 - cylinder; 21 - piston; 22 - driving rod; 23 - needle; 24 - compression spring; 25 - clamping groove; 26 - clamping pin; 27 - notch; 28 - end cover. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0024] Referring to Figures 1 to 6 The launcher provided in the embodiments of the present application comprises a launching cylinder 10, wherein the launching cylinder 10 has a cavity for accommodating an injector 2, and a driving assembly is arranged on the launching cylinder 10 and used to drive the injector 2 to slide in the cavity; and the launcher 1 further comprises a trigger assembly used to limit or release the injector 2. In the embodiments, the injector 2 is launched by the launching cylinder 10 and the driving assembly, and the launching impact force can be increased by designing the driving force of the driving assembly, so that the target part can be smoothly punctured, for example, the skull can be punctured to reach the lamina cribrosa layer in intracranial bone marrow injection. In addition, the trigger assembly is designed to limit and release the injector 2, so that the structure is more compact. Preferably, a handle grip 16 is arranged on the launcher 1, so that the launcher 1 is convenient to hold and use, and the trigger assembly is arranged on the handle grip 16, so that the injector 2 can be released by finger operation. Of course, in other embodiments, the limiting and releasing of the injector 2 can be achieved by independent and separate mechanisms, which are not limited in the embodiments.

[0025] Referring to Figures 1 to 6The trigger assembly includes a limiting part 110 that extends into the chamber to restrict the movement of the syringe 2, and a firing trigger 111 that drives the limiting part 110 out of the chamber. In this embodiment, the limiting part 110 is used to limit the syringe 2. The limiting part 110 extends into or out of the firing tube 10 to limit and release the syringe 2. In its natural state, the limiting part 110 extends into the firing tube 10 to limit the syringe 2. At this time, the driving assembly cannot push the syringe 2 and cannot complete the firing. When the trigger assembly is used to remove the limiting part from the inner cavity of the firing tube 10, the limiting part 110 no longer limits the syringe 2. At this time, the driving assembly pushes the syringe 2 to complete the firing of the syringe 2. Specifically, the needle 23 of the syringe 2 is pushed out of the firing tube 10, and the needle 23 can then penetrate the target area. In addition, the limiting of the transmitter 1 is divided into two types. One type of limiting restricts the movement or stillness of the syringe 2, completing the two states of the syringe 2 from stationary to moving, which is the limiting detailed in the above embodiment. The other type of limiting is the limiting of the firing stroke of the syringe 2, that is, limiting how far the needle 23 extends, thereby controlling the depth of the needle 23 piercing the target area. This limiting will be described in detail in the following embodiment.

[0026] For a further detailed explanation of the above plan, please refer to [link / reference]. Figures 1 to 6 The limiting part 110 and the firing trigger 111 are both mounted on the rotating shaft 112. The limiting part 110 and the firing trigger 111 rotate synchronously around the rotating shaft 112 in the same direction. The rotation path of the firing trigger 111 is the path through which the limiting part 110 either disengages from or enters the chamber. In this embodiment, the specific limiting method is refined, that is, the limiting part 110 and the firing trigger 111 are rotated by the rotating shaft 112, thereby enabling the limiting part 110 to disengage from the firing tube 10. The limiting part 110 and the firing trigger 111 rotate synchronously. The firing trigger 111 can be regarded as an active rotating component, and the limiting part 110 as a passive rotating component. When the firing trigger 111 rotates, the limiting part 110 can move accordingly to disengage from the firing tube 10. Figure 2 As shown, when the launch tube 10 is horizontally positioned, the rotating shaft 112 is located below the launch tube 10, and the direction in which the rotating shaft 112 extends is perpendicular to the launching direction of the launch tube 10. Preferably, the limiting part 110 includes a limiting protrusion with a certain curvature, such as... Figure 2 The diagram shows the limiting state, where the limiting protrusion extends into the firing tube 10. The syringe 2 has a notch 27 that mates with the limiting protrusion. The limiting protrusion restricts the movement of the syringe 2. When the firing trigger 111 is pulled, in... Figure 2When the trigger 111 rotates anticlockwise around the rotating shaft 112, the limiting protrusion rotates anticlockwise to get out of the launching barrel 10, and the limiting to the injector 2 is released. Preferably, the limiting part 110 and the trigger 111 are integrally formed, so that only a through hole is needed to be designed at a proper position of the structure for the rotating shaft 112 to pass through.

[0027] As an optimization of the embodiment of the utility model, please refer to Figures 1 to 6 The trigger 111 is also provided with an unlocking assembly for unlocking the movement limitation of the trigger 111. In the embodiment, the unlocking assembly can be used as a safety device to prevent the trigger 111 from being triggered by mistake. When the injector 2 needs to be launched, the movement limitation of the trigger 111 is unlocked by the unlocking assembly, and then the trigger 111 can be driven.

[0028] As an optimization of the embodiment of the utility model, please refer to Figures 1 to 6 The unlocking assembly includes an unlocking trigger 120 and an unlocking rod 121 connected to the unlocking trigger 120. The trigger 111 is provided with a limiting groove 113, and the unlocking rod 121 is provided with a trigger pin 122 which can be clamped into the limiting groove 113. In the embodiment, the unlocking is achieved by driving the unlocking rod 121 to move by the unlocking trigger 120. The trigger pin 122 is clamped into the limiting groove 113 in the unlocked state, so that the trigger 111 cannot be triggered. When the injector 2 needs to be launched, the unlocking trigger 120 is pulled, the unlocking rod 121 is driven by the unlocking trigger 120, and then the trigger pin 122 on the unlocking rod 121 is driven to get out of the limiting groove 113, so that the trigger 111 can be triggered. Preferably, the unlocking rod 121 is provided with a first spring 123. The first spring 123 provides a pulling force for the unlocking trigger 120 and prevents the unlocking trigger 120 from being triggered by mistake. The first spring 123 can also be used for resetting. Preferably, the unlocking trigger 120 also rotates around the rotating shaft 112, so that the unlocking and the launching can be simultaneously performed, the launching speed is increased, and the structure is more compact. The driving path of the unlocking trigger 120 is limited, and the unlocking operation is more reliable. When the unlocking trigger 120 rotates, the trigger pin 122 moves, and the limiting groove 113 is not large, so that the trigger pin 122 only needs to move to get out of the limiting groove 113, and the unlocking is completed. Of course, the unlocking trigger 120 can also be designed to directly push backward. This implementation can also be achieved, but the structure is not as compact as the above-mentioned structure.

[0029] As an optimization of the embodiment of the utility model, please refer to Figures 1 to 6The transmitter 1 further comprises a control assembly for controlling the injection of the syringe 2 after sliding into position. In the embodiment, when the transmitter 1 is used in cooperation with the syringe 2, after the syringe 2 is released from the position limiting and is launched, the medicine in the syringe 2 needs to be injected into the target site, at which time the injection of the syringe 2 can be controlled by the control assembly arranged on the transmitter 1, which can be used in cooperation with the structure on the syringe 2, and the following embodiment will be described in detail.

[0030] As an optimization of the embodiment of the utility model, please refer to Figures 1 to 6 The driving assembly comprises a second spring, which is detachably installed in the inner cavity of the launching barrel 10. In the embodiment, the driving mode of launching the syringe 2 is to push the syringe 2 by the spring. Of course, in addition to this, other linear driving modes similar to the air cylinder are also feasible, and the embodiment does not limit this. When the second spring is used, the end cover 28 of the transmitter 1 is first opened, the second spring is taken out from the transmitter 1, then the syringe 2 is installed into the transmitter 1 through the opening formed after the end cover 28 is opened, and the second spring is installed into the transmitter 1 and the end cover 28 is covered, and the second spring is located at the right side of the launching barrel 10 as shown in Figure 1 .

[0031] As an optimization of the embodiment of the utility model, please refer to Figures 1 to 6 The transmitter 1 further comprises a limiting structure for limiting the sliding stroke of the syringe 2, which is arranged at one end of the launching barrel 10 for the needle 23 of the syringe 2 to extend. In the embodiment, in addition to the position limiting of the transmitter 1 described above, a set of limiting mechanism is designed, that is, the sliding stroke of the syringe 2 is limited, so that the depth of the needle 23 of the syringe 2 into the target site can be controlled, and when used in the field of transcranial bone marrow injection, the needle 23 can just penetrate into the barrier layer, and the medicine in the syringe 2 is injected into the barrier layer, so as to realize the transcranial bone marrow drug delivery. Preferably, the limiting structure and the second spring belong to two ends of the transmitter 1. The limiting structure comprises a limiting sheet and a scale ring 140, the scale ring 140 is provided with scales, and the scale ring 140 is rotatably installed on the launching barrel 10, the position of the limiting sheet in the launching barrel 10 is adjusted by rotating the scale ring 140, so as to block the syringe 2. The limiting sheet has a hole through which the needle 23 of the syringe 2 passes.

[0032] As an optimization of the embodiment of the utility model, please refer to Figures 1 to 6The transmitter 1 further comprises a buffer ring 141 arranged at the end of the launching barrel 10, which can play a buffering role and contact the target site, so that when the injector 2 is launched to impact the target site, the buffer ring 141 can play a buffering role to avoid hurting the skin around the target site. The buffer ring 141 can be made of flexible materials such as rubber pads, and the embodiment is not limited in this regard.

[0033] Please refer to Figure 7 and Figure 8 The utility model discloses an injector, which comprises a cylinder barrel 20, a piston 21 slidingly arranged in the cylinder barrel 20, a driving rod 22 connected to the piston 21, and a needle 23 arranged at one end of the cylinder barrel 20. The cylinder barrel 20 is slidingly arranged in the launching barrel 10, and the trigger assembly limits or releases the cylinder barrel 20. In this embodiment, the trigger assembly acts on the cylinder barrel 20, and the launching of the injector 2 is realized by limiting or releasing the cylinder barrel 20. The working mode of the injector 2 is similar to that of a common injector 2, that is, two sealed spaces are separated by the piston 21, so that the driving rod 22 can pull the piston 21 to suck the liquid medicine, and the piston 21 can be pushed to inject the liquid medicine.

[0034] As an optimization scheme of the utility model embodiment, please refer to Figure 7 and Figure 8 The injector 2 further comprises a limiting piece for limiting the movement of the driving rod 22 in the cylinder barrel 20. In this embodiment, the movement of the driving rod 22 is limited by the limiting piece, thereby limiting the sliding of the piston 21, so as to control the injection amount. The above embodiment illustrates that the liquid medicine is injected out by moving the piston 21 in the cylinder barrel 20, and the movement of the driving rod 22 is limited by the limiting piece, so that the injection amount can be controlled according to the length of the sliding stroke of the piston 21.

[0035] Further optimizing the above scheme, please refer to Figure 7 and Figure 8 The driving rod 22 is sleeved with a compression spring 24, and a plurality of clamping grooves 25 are arranged on the driving rod 22. Each clamping groove 25 is arranged along the length direction of the driving rod 22. The limiting piece comprises a clamping pin 26 which can be clamped into any clamping groove 25. In this embodiment, the sliding of the piston 21 is driven by the compression spring 24, and the limiting piece can be refined as the clamping pin 26, which is clamped into the clamping groove 25 of the driving rod 22, thereby limiting the sliding of the piston 21 in the cylinder barrel 20. Of course, the limiting piece can also adopt other structures capable of being clamped into the clamping groove 25 or other limiting methods, and the embodiment is not limited in this regard. Each clamping groove 25 can be arranged along the length direction of the driving rod 22, so that the movement amount of the piston 21 can be controlled according to the need, thereby controlling the injection amount.

[0036] As the optimization scheme of the utility model embodiment, please refer to Figures 1 to 6 , the device further includes a control assembly for releasing the restriction of the limiting member on the piston 21. Specifically, the control assembly can be provided on the launcher 1, and when it releases the restriction of the limiting member on the piston 21, the purpose of controlling the injection of the syringe 2 after sliding to the position can be achieved. Thus, when the trigger assembly controls the launcher 2 to be launched, the injection of the syringe 2 is controlled through the control assembly. Both controls are concentrated on the handle grip 16, single-handed operation can be achieved, and the structure is more compact.

[0037] Refine the above-mentioned control assembly, please refer to Figures 1 to 6 , the control assembly includes an injection key 130, an injection lever 131 rotated by the injection key 130, and an injection top rod 132 lifted by the injection lever 131, and the injection top rod 132 drives the limiting member to move to release the restriction on the piston 21. In this embodiment, the control means adopts the cooperation of the injection key 130, the injection lever 131 and the injection top rod 132. When in use, the injection key 130 is rotated or cocked (such as Figure 1When the injection key 130 is rotated (the direction of rotation is indicated by the arrow shown in the figure), the injection key 130 will rotate with the injection rod 131, so that the injection rod 132 moves upward, thereby driving the limiting member to move, that is, driving the catch 26 to move, thereby releasing the limiting of the piston 21. Preferably, a spring is also sleeved on the injection rod 132, which can play a resetting role. Preferably, the limiting member has a fulcrum in the middle, when the injection rod 132 drives one end of the limiting member, the limiting member rotates to make the other end of the limiting member away from the driving rod 22. Specifically, the limiting member is refined into the catch 26, that is, the middle of the catch 26 has a fulcrum, when the injection rod 132 drives one end of the catch 26, the catch 26 rotates under the action of the fulcrum, so that the other end of the catch 26 is out of the clamping groove 25, thereby completing the release of the limiting. Preferably, the catch 26 is arranged on the torsional spring 133, the injection rod 132 drives one end of the catch 26, drives the catch 26 to rotate against the elastic force of the torsional spring 133, the other end of the catch 26 will sink to be out of the clamping groove 25, after the driving rod 22 loses the limiting force, will push the piston 21 to realize the injection of the medicine under the action of the compression spring 24, when the force of rotating the injection key 130 is removed, the catch 26 will reset under the action of the torsional spring 133, the catch 26 will be clamped into the clamping groove 25 again. Of course, in addition to the cooperation of the injection key 130, the injection rod 131, the injection rod 132, the torsional spring 133 and other control modes, other control modes can also be used, for example, a vertical catch 26 can also be used, and a spring can be used to provide a rebounding force, when the limiting of the driving rod 22 needs to be released, the catch 26 is pulled downward, the catch 26 is away from the clamping groove 25, the limiting of the driving rod 22 is released, and the injection is completed. By using the injection key 130, a one-handed operation mode can be provided, the injection key 130 is arranged beside the unlocking assembly and the trigger assembly, for example, two or three fingers are linked, for example, the index finger operates the unlocking assembly, the middle finger operates the trigger assembly, and the thumb operates the injection key 130, which is more convenient.

[0038] As an optimization scheme of the embodiment of the utility model, please refer to Figures 1 to 8 The cylinder 20 has a notch 27 for the limiting part 110 of the trigger assembly to extend into the cylinder 20 to limit the injector 2. In this embodiment, the cylinder 20 has the notch 27 which can cooperate with the limiting part 110 of the trigger assembly, and the limiting part 110 can be driven by the trigger assembly. The specific driving mode is described in the above embodiment, which will not be repeated here. When the limiting part 110 rotates and is out of the notch 27, the cylinder 20 is no longer limited, and the second spring can shoot the needle 23 of the injector 2 out of the launching barrel 10.

[0039] As an optimization scheme of the embodiment of the utility model, please refer to Figure 1 and Figure 2, one end of the launching barrel 10 has an opening for accommodating the injector 2, and the opening is provided with an end cover 28. In this embodiment, the end cover 28 is opened, the injector 2 is accommodated in the launching barrel 10, then the second spring is arranged against the injector 2, and the end cover 28 is installed on the launching barrel 10 to block the opening. The end cover 28 can be installed on the launching barrel 10 in many ways, for example, the end cover 28 is inserted into the launching barrel 10 as shown in Figure 1 , then rotated to lock the end cover 28 on the launching barrel 10, or the end cover 28 can be screwed on the launching barrel 10, or the opening can be opened by a flip cover, and the flip cover can be locked on the launching barrel 10 by a lock, and many other ways, which are not limited in this embodiment.

[0040] Please refer to Figures 1 to 8The utility model discloses an injection device, including above -mentioned syringe 2 and transmitter 1, both can cooperate and use. The use method of this injection device is specifically as follows: first, the syringe 2 is used to draw medicine, specifically, the driving rod 22 is pulled, the driving rod 22 drives the piston 21 to slide in the cylinder 20 and draws the liquid medicine into the cylinder 20, then through the bayonet 26 is clamped into the card slot 25, keeps the driving rod 22 unmoved. Then, the end cover 28 at the end of the launching cylinder 10 is opened, the second spring in the launching cylinder 10 is taken out, the syringe 2 is loaded into the launching cylinder 10, and the second spring is loaded into the launching cylinder 10, and the end cover 28 is tightly covered, the end cover 28 compresses the second spring, and the syringe 2 is in the launching state. Adjust the scale ring 140 to adjust the position of the limiting sheet, accurately control the distance of the needle 23, and the step can also be adjusted before the syringe 2 is loaded into the launching cylinder 10. Taking the injection of the skull as an example, one hand or both hands can hold the handle grip 16, the middle finger touches the trigger 111, the index finger touches the unlocking trigger 120, the thumb touches the injection key 130, then the launching cylinder 10 is aligned with the injection site, and the buffer ring 141 is attached to the injection site. After ensuring that the buffer ring 141 is attached to the injection site, the index finger is first cocked and the unlocking trigger 120 is cocked, at this time the trigger 111 will be opened, and then the middle finger is cocked and the trigger 111 is cocked, the two actions can basically achieve seamless connection, that is, simultaneous pressing. After cocking the trigger 111, the trigger 111 will take the limiting part 110 out of the gap 27 of the launching cylinder 10, at this time the syringe 2 loses the limiting force and will be pushed by the second spring, we can design the spring force of the second spring in advance to ensure that the needle 23 of the syringe 2 can pierce the target site when being shot. After the second spring pushes the syringe 2, the syringe 2 moves at high speed in the launching cylinder 10, and the needle 23 of the syringe 2 extends out of the launching cylinder 10 and pierces the injection site. After piercing the injection site, the injection key 130 is cocked at this time, and the injection key 130 is connected with the injection lever 131, the rotation of the injection key 130 will take the injection lever 131 to rotate, and the injection lever 131 is opposite the injection lever 131, when the injection lever 131 rotates, one end of the injection lever 131 is lifted, so that the injection lever 132 is lifted, and the bayonet 26 can rotate around the fulcrum, the injection lever 132 contacts the left end of the bayonet 26 to drive the left end of the bayonet 26 to rise, so that the right end falls, so that the bayonet 26 can be taken out of the card slot 25. When the bayonet 26 is taken out of the card slot 25, the driving rod 22 is no longer limited, the compression spring 24 pushes the driving rod 22 to move, the driving rod 22 pushes the piston 21 to slide to inject the medicine.In the process, in order to be able to batch or adjust the injection amount, the key 26 can be installed on the torsional spring 133, so that the key 26 has a reset capability, that is, when the injection key 130 is loosened, the key 26 will be driven to rotate to the initial state again under the action of the torsional spring 133, and the key 26 is clamped into another clamping groove 25 to limit the driving rod 22, so that batch injection or injection amount control can be achieved. Since the clamping groove 25 has multiple, batch injection can be achieved, and injection can also be stopped in time. Thus, the drug injection is completed.

[0041] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and modifications can be made to these embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A transmitter, characterized in that: The device includes a launch tube having a chamber into which a syringe can be inserted, and a drive assembly for driving the syringe to slide within the chamber. The launcher also includes a trigger assembly for limiting or releasing the syringe and a limiting structure for limiting the sliding stroke of the syringe. The limiting structure is located at the end of the launch tube where the syringe needle extends, and includes a limiting plate and a graduated ring.

2. The transmitter as described in claim 1, characterized in that: The trigger assembly includes a limiting portion that extends into the chamber to restrict movement of the syringe and a firing trigger that drives the limiting portion out of the chamber.

3. The transmitter as described in claim 2, characterized in that: Both the limiting part and the firing trigger are mounted on a rotating shaft. The limiting part and the firing trigger rotate synchronously around the rotating shaft and their rotation directions are the same. The rotation path of the firing trigger is the path through which the limiting part disengages from or enters the chamber.

4. The transmitter as described in claim 2, characterized in that: It also includes an unlocking component for releasing the movement restriction of the firing trigger.

5. The transmitter as described in claim 4, characterized in that: The unlocking assembly includes an unlocking trigger and an unlocking lever connected to the unlocking trigger. The firing trigger has a limiting groove, and the unlocking lever has a trigger bolt that can be engaged into the limiting groove.

6. The transmitter as described in claim 5, characterized in that: A first spring is fitted onto the unlocking rod.

7. The transmitter as claimed in claim 1, characterized in that: It also includes a control component for controlling the injection of the syringe after it has slid into place.

8. The transmitter as claimed in claim 1, characterized in that: The drive assembly includes a second spring, which is detachably mounted in the inner cavity of the launch tube.

9. An injection device comprising a syringe, characterized in that: It also includes a transmitter as described in any one of claims 1-8, wherein the syringe is mounted in the cavity of the transmitter.

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