An injection device

Abstract

This invention relates to the field of injection device technology, and provides an injection device including a syringe and a launcher. The launcher has a launch tube into which the syringe is inserted and a drive assembly that drives the needle of the syringe to exit the launch tube. A handle is mounted on the launch tube, and a trigger assembly for limiting or releasing the syringe is mounted on the handle. This injection device uses a launcher to launch the syringe, which, in conjunction with the drive assembly, moves the syringe. During high-speed movement, the syringe can puncture the target site. Compared to traditional surgery, this method is more convenient for drug administration and less invasive. Compared to traditional neuroprotective treatments, it shortens the treatment time. Furthermore, the launcher has a simple structure, is easy to implement, and is inexpensive, saving patients significant treatment costs.

Description

Technical Field

[0001] This invention relates to the field of injection device technology, specifically to an injection device. Background Technology

[0002] For patients with injuries or illnesses located in difficult-to-reach or treat areas of the body, such as those suffering from ischemic stroke, the main treatment methods fall into two categories: revascularization therapy and neuroprotective therapy. Revascularization therapy is generally performed surgically, which carries a higher risk of harm to the patient and requires a significant amount of time, posing a considerable risk, especially to patients in the acute phase. Neuroprotective therapy, on the other hand, is hampered by the blood-brain barrier, making it difficult for drugs to reach the brain target via blood vessels. Both of these methods, and other existing approaches, suffer from high costs and significant challenges. Summary of the Invention

[0003] The purpose of this invention is to provide an injection device that can at least solve some of the defects in the prior art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an injection device, comprising a syringe and a launcher, wherein the launcher has a launch tube into which the syringe is inserted and a drive assembly for driving the needle of the syringe to exit the launch tube, a handle is mounted on the launch tube, and a trigger assembly for limiting or releasing the syringe is mounted on the handle.

[0005] Furthermore, the syringe includes a cylinder, a piston slidably disposed within the cylinder, a drive rod connected to the piston, and a needle mounted at one end of the cylinder. The cylinder is slidably disposed within the firing tube, and the trigger assembly limits or releases the cylinder.

[0006] Furthermore, it also includes a limiting member for restricting the movement of the drive rod within the cylinder.

[0007] Furthermore, a compression spring is sleeved on the drive rod, and the drive rod is provided with a plurality of slots, each of the slots being arranged sequentially along the length direction of the drive rod, and the limiting member includes a locking pin that can be engaged into any of the slots.

[0008] Furthermore, it also includes a control component for releasing the limiting member from restricting the piston.

[0009] Furthermore, the control component includes an injection button, an injection lever driven to rotate by the injection button, and an injection push rod driven to rise and fall by the injection lever, the injection push rod driving the limiting member to move to release the restriction on the piston.

[0010] Furthermore, the limiting member has a fulcrum in the middle. When the injection rod pushes one end of the limiting member, the limiting member rotates so that its other end leaves the driving rod.

[0011] Furthermore, the cylinder has a notch for the limiting portion of the trigger assembly to extend into the cylinder to limit the syringe.

[0012] Furthermore, the trigger assembly has a firing trigger that drives the limiting portion out of the cylinder.

[0013] Furthermore, one end of the launch tube has an opening for inserting the syringe, and the opening is provided with an end cap.

[0014] Compared with the prior art, the beneficial effects of the present invention are: an injection device that uses a transmitter to launch a syringe can be used in conjunction with a drive component to drive the syringe to move. During the high-speed movement, the syringe can puncture the target site. Compared with traditional surgery, it is more convenient to administer medication and less invasive. Compared with traditional neuroprotective treatment, the treatment time is shorter. Moreover, the transmitter has a simple structure, is easy to implement, and is inexpensive, which can save a lot of treatment costs for patients. Attached Figure Description

[0015] Figure 1 A schematic diagram of a transmitter provided in an embodiment of the present invention;

[0016] Figure 2 This is a partial internal structure diagram of a transmitter provided in an embodiment of the present invention;

[0017] Figure 3 A schematic diagram of a transmitter in a non-transmitting state provided in an embodiment of the present invention;

[0018] Figure 4 A schematic diagram illustrating the transmission state of a transmitter according to an embodiment of the present invention;

[0019] Figure 5 A schematic diagram of a transmitter control component in a non-operating state provided in an embodiment of the present invention;

[0020] Figure 6 A schematic diagram illustrating the working state of a transmitter control component according to an embodiment of the present invention;

[0021] Figure 7 A schematic diagram of the internal structure of a syringe provided in an embodiment of the present invention;

[0022] Figure 8 for Figure 7 A magnified view of a portion of the image;

[0023] In the attached figures, the following are the reference numerals: 1-launcher; 10-launching tube; 110-limiting part; 111-launching trigger; 112-rotating shaft; 113-limiting groove; 120-unlocking trigger; 121-unlocking lever; 122-trigger bolt; 123-first spring; 130-injection button; 131-injection lever; 132-injection push rod; 133-torsion spring; 140-scale ring; 141-buffer ring; 15-lock head; 16-handle grip; 2-syringe; 20-cylinder; 21-piston; 22-drive rod; 23-needle; 24-compression spring; 25-slot; 26-locking pin; 27-notch; 28-end cap. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Please see Figures 1 to 6 This invention provides a launcher, including a launch tube 10 with a chamber for inserting a syringe 2. A drive assembly is mounted on the launch tube 10 to drive the syringe 2 to slide within the chamber. The launcher 1 also includes a trigger assembly for limiting or releasing the syringe 2. In this embodiment, the launch tube 10 and drive assembly are used to launch the syringe 2. By designing the driving force of the drive assembly, a strong launch impact force can be obtained, thus successfully piercing the target site. For example, during intracranial bone marrow injection, it can quickly pierce the skull and reach the diploic layer. Furthermore, the trigger assembly allows for the combined limiting and releasing of the syringe 2, resulting in a more compact structure. Preferably, the launcher 1 has a handle 16 for convenient handheld use, and the trigger assembly is located on the handle 16 for easy finger operation to release the syringe 2. Of course, in other embodiments, limiting and releasing the syringe 2 can be achieved using independent and separate mechanisms; this embodiment does not limit this.

[0026] For a more detailed description of transmitter 1, please refer to [link / reference]. 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.

[0027] For further details on 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 2The firing trigger 111 rotates counterclockwise around the rotating shaft 112, causing the limiting protrusion to rotate counterclockwise to disengage from the firing tube 10 and release the limiting effect on the syringe 2. Preferably, the limiting part 110 and the firing trigger 111 are integrally formed, so that only a through hole needs to be designed at a suitable position in the structure for the rotating shaft 112 to pass through.

[0028] As an optimized solution for an embodiment of the present invention, please refer to Figures 1 to 6 The transmitter 1 also includes an unlocking component for releasing the movement restriction of the firing trigger 111. In this embodiment, the unlocking component serves as a safety measure to prevent accidental firing of the firing trigger 111. When it is necessary to fire the syringe 2, the movement restriction on the firing trigger 111 is released first through the unlocking component, thereby driving the firing trigger 111.

[0029] For a more detailed explanation of the unlocking components mentioned above, please refer to [link / reference]. Figures 1 to 6 The unlocking assembly includes an unlocking trigger 120 and an unlocking lever 121 connected to the unlocking trigger 120. The firing trigger 111 has a limiting groove 113, and the unlocking lever 121 has a trigger bolt 122 that can be engaged in the limiting groove 113. In this embodiment, the unlocking method is to drive the unlocking lever 121 to move using the unlocking trigger 120. The unlocking lever 121 has a trigger bolt 122. In the unlocked state, the trigger bolt 122 is engaged in the limiting groove 113 of the firing trigger 111, and the firing trigger 111 cannot be pulled at this time. When firing is required, the unlocking trigger 120 is driven or pulled, and the unlocking lever 121 is driven by the unlocking trigger 120. Consequently, the trigger bolt 122 on the unlocking lever 121 is driven to disengage from the limiting groove 113, at which point the firing trigger 111 can be driven or pulled. Preferably, a first spring 123 is fitted onto the unlocking lever 121. The first spring 123 provides a certain pulling force to the unlocking trigger 120, prevents accidental activation of the unlocking trigger 120, and allows for resetting. Preferably, the unlocking trigger 120 also rotates around the rotation axis 112, enabling simultaneous unlocking and firing, i.e., pressing the unlock button and firing simultaneously, accelerating the firing rate. This structural design makes the structure more compact. Furthermore, it limits the drive path of the unlocking trigger 120, making the unlocking operation more reliable. Rotation causes the trigger bolt 122 to move. The limiting groove 113 is small, so only the movement of the trigger bolt 122 is needed to disengage it from the limiting groove 113, thus completing the unlocking. Of course, it can also be designed as a direct push-back mechanism, which is also possible, but the structure is not as compact as the above-described solution.

[0030] As an optimized solution for an embodiment of the present invention, please refer to Figures 1 to 6The transmitter 1 also includes a control component for controlling the injection of the syringe 2 after it has slid into position. In this embodiment, when the transmitter 1 is used in conjunction with the syringe 2, after the syringe 2 has been released from its limit and launched, it is still necessary to inject the drug in the syringe 2 into the target site. At this time, the injection of the syringe 2 can be controlled by the control component provided on the transmitter 1. This control component can be used in conjunction with the structure on the syringe 2, which will be described in detail in the following embodiment.

[0031] As an optimized solution for an embodiment of the present invention, please refer to Figures 1 to 6 The driving assembly includes a second spring, which is detachably installed in the inner cavity of the launching tube 10. In this embodiment, the launching syringe 2 is driven by a spring pushing the syringe 2. Of course, other linear driving methods, such as those using a cylinder, are also feasible, and this embodiment does not limit this. When using the second spring, first open the end cap 28 of the launcher 1, remove the second spring from the launcher 1, then insert the syringe 2 into the launcher 1 through the opening formed after opening the end cap 28, then insert the second spring into the launcher 1 and close the end cap 28. The second spring is located as follows: Figure 1 The right side of the launch tube 10 shown.

[0032] As an optimized solution for an embodiment of the present invention, please refer to Figures 1 to 6 The launcher 1 also includes a limiting structure for restricting the sliding stroke of the syringe 2. This limiting structure is located at the end of the launch tube 10 where the needle 23 of the syringe 2 extends. In this embodiment, in addition to the aforementioned limiting of the launcher 1, this embodiment also designs a limiting mechanism to restrict the sliding stroke of the syringe 2. This controls the depth to which the needle 23 of the syringe 2 penetrates the target site. When used in the field of transcranial bone marrow injection, the needle 23 can be precisely inserted into the diploic layer, and then the drug inside the syringe 2 can be injected into the diploic layer, thereby achieving drug delivery via the cranial bone marrow. Preferably, the limiting structure and the second spring are located at opposite ends of the launcher 1. The limiting structure includes a limiting plate and a graduated ring 140. The graduated ring 140 has graduations and is rotatably mounted on the launch tube 10. By rotating the graduated ring 140, the position of the limiting plate in the launch tube 10 is adjusted, thereby blocking the syringe 2. The limiting plate has a hole through which the needle 23 of the syringe 2 passes.

[0033] As an optimized solution for an embodiment of the present invention, please refer to Figures 1 to 6The transmitter 1 also includes a buffer ring 141 located at the end of the firing tube 10. The buffer ring 141 can act as a buffer when it contacts the target area. When the syringe 2 is ejected and impacts the target area, the buffer ring 141 can act as a buffer to avoid damage to the skin around the target area. The buffer ring 141 can be made of flexible materials such as rubber pads, and this embodiment does not limit this.

[0034] Please see Figure 7 and Figure 8 This invention provides a syringe, including a cylinder 20, a piston 21 slidably disposed within the cylinder 20, a drive rod 22 connected to the piston 21, and a needle 23 mounted at one end of the cylinder 20. The cylinder 20 is slidably disposed within a firing tube 10, and a trigger assembly limits or releases the cylinder 20. In this embodiment, the trigger assembly acts on the cylinder 20, releasing the syringe 2 by limiting or releasing the cylinder 20. The syringe 2 operates similarly to common syringes, using a piston 21 to separate two sealed spaces. Pulling the piston 21 with the drive rod 22 draws in the liquid, while pushing the piston 21 injects the liquid.

[0035] As an optimized solution for an embodiment of the present invention, please refer to Figure 7 and Figure 8 The syringe 2 also includes a limiting member for restricting the movement of the drive rod 22 within the cylinder 20. In this embodiment, the limiting member restricts the movement of the drive rod 22, thereby limiting the sliding of the piston 21, which can achieve the purpose of controlling the amount of injected medication. The above embodiment illustrates that the liquid medication is injected by the piston 21 moving within the cylinder 20. Therefore, by limiting the movement of the drive rod 22 with the limiting member, the length of the piston 21's sliding stroke can be designed as needed to control the injection volume.

[0036] For further optimization of the above solution, please refer to [link / reference]. Figure 7 and Figure 8 A compression spring 24 is fitted onto the drive rod 22, and the drive rod 22 has several slots 25, each slot 25 being arranged sequentially along the length direction of the drive rod 22. The limiting member includes a locking pin 26 that can be engaged in any of the slots 25. In this embodiment, the piston 21 is slidable using the compression spring 24 to provide the driving force. The limiting member can be further refined into a locking pin 26, which engages in the slots 25 of the drive rod 22, thereby limiting the sliding of the piston 21 within the cylinder 20. Of course, in addition to the locking pin 26, other structures capable of engaging in the slots 25 or other limiting methods can be used for the limiting member; this embodiment does not impose any restrictions on this. The slots 25 can be arranged sequentially at intervals along the length direction of the drive rod 22, thus controlling the amount of movement of the piston 21 as needed, thereby controlling the injection volume.

[0037] As an optimized solution for an embodiment of the present invention, please refer to Figures 1 to 6 The device also includes a control component for releasing the limiting member from restricting the piston 21. Specifically, this control component can be located on the launcher 1. When it releases the limiting member from restricting the piston 21, it can control the injection of the syringe 2 after it has slid into position. Thus, after the trigger assembly controls the syringe 2 to fire, the control component controls the injection of the syringe 2. Both controls are concentrated on the handle grip 16, which allows for one-handed operation and makes the structure more compact.

[0038] For a more detailed description of the control components described above, please refer to [link / reference]. Figures 1 to 6 The control component includes an injection button 130, an injection lever 131 driven to rotate by the injection button 130, and an injection push rod 132 driven to rise and fall by the injection lever 131. The injection push rod 132 drives the limiting member to move to release the restriction on the piston 21. In this embodiment, the control method employs the cooperation of the injection button 130, the injection lever 131, and the injection push rod 132. In use, rotating or pressing the injection button 130 (e.g., Figure 1Rotating the injection button 130 (as indicated by the arrow next to it) causes the injection lever 131 to rotate, which in turn causes the injection push rod 132 to move upward, thereby driving the limiting member to move, that is, driving the locking pin 26 to move, thus releasing the limiting of the piston 21. Preferably, a spring is also fitted on the injection push rod 132 to play a reset role. Preferably, the limiting member has a fulcrum in the middle. When the injection push rod 132 pushes one end of the limiting member, the limiting member rotates so that its other end leaves the drive rod 22. Specifically, the limiting member is refined into a locking pin 26, that is, the locking pin 26 has a fulcrum in the middle. When the injection push rod 132 pushes one end of the locking pin 26, the locking pin 26 rotates under the action of the fulcrum, thereby causing the other end of the locking pin 26 to disengage from the locking groove 25, thus completing the release of the limiting. Preferably, the locking pin 26 is mounted on the torsion spring 133. The injection push rod 132 pushes one end of the locking pin 26, causing the locking pin 26 to rotate against the elastic force of the torsion spring 133. The other end of the locking pin 26 will sink and disengage from the slot 25. After the drive rod 22 loses its limiting force, it will push the piston 21 under the action of the compression spring 24 to realize the injection of the drug. When the force of rotating the injection button 130 is removed, the locking pin 26 will reset under the action of the torsion spring 133 and the locking pin 26 will re-lock into the slot 25. Of course, in addition to using the injection button 130, injection lever 131, injection push rod 132, and torsion spring 133 for control, other control methods can also be used. For example, a vertical locking pin 26 can be used, or a spring can be used to provide the rebound force. When it is necessary to release the limiting force on the drive rod 22, the locking pin 26 is pulled down, the locking pin 26 leaves the slot 25, the limiting force on the drive rod 22 is released, and the injection is completed. The injection button 130 provides a one-handed operation method. The injection button 130 is located next to the unlocking component and the trigger component. If you hold the handle 16 with one hand, you can use two or three fingers in conjunction, such as the index finger to operate the unlocking component, the middle finger to operate the trigger component, and the thumb to operate the injection button 130, which is more convenient.

[0039] As an optimized solution for an embodiment of the present invention, please refer to Figures 1 to 8 The cylinder 20 has a notch 27 for the limiting portion 110 of the trigger assembly to extend into the cylinder 20 to limit the syringe 2. In this embodiment, the notch 27 on the cylinder 20 can cooperate with the limiting portion 110 of the trigger assembly. The limiting portion 110 can be driven by the trigger assembly. For the specific driving method, please refer to the description of the above embodiment, which will not be repeated here. When the limiting portion 110 rotates and disengages from the notch 27, the cylinder 20 is no longer restricted, and the second spring can eject the needle 23 of the syringe 2 from the firing tube 10.

[0040] As an optimized solution for an embodiment of the present invention, please refer to Figure 1 and Figure 2One end of the launching tube 10 has an opening for inserting the syringe 2, and the opening is provided with an end cap 28. In this embodiment, the end cap 28 is opened, the syringe 2 is inserted into the launching tube 10, then the second spring is installed against the syringe 2, and then the end cap 28 is installed on the launching tube 10 to seal the opening. There are many ways to install the end cap 28 and the launching tube 10, for example, using... Figure 1 The method shown is to insert the launch tube 10 and then rotate it so that the lock head 15 locks onto the launch tube 10. Alternatively, the end cap 28 can be screwed onto the launch tube 10 using a threaded connection. Or, the opening can be opened by using a flip cover and then the flip cover can be locked onto the launch tube 10 using a lock. There are many ways to do this, and this embodiment does not limit it.

[0041] Please see Figures 1 to 8This invention provides an injection device, including the syringe 2 and the launcher 1 described above, which can be used together. The specific method of using this injection device is as follows: First, the syringe 2 draws in the medication. Specifically, the drive rod 22 is pulled, causing the piston 21 to slide within the cylinder 20, drawing the medication into the cylinder 20. Then, the drive rod 22 is held in place by the locking pin 26 engaging the locking groove 25. Next, the end cap 28 at the end of the launcher 10 is opened, the second spring inside the launcher 10 is removed, the syringe 2 is inserted into the launcher 10, and the second spring is then inserted into the launcher 10. The end cap 28 is then tightened, compressing the second spring and putting the syringe 2 into the firing state. The scale ring 140 is adjusted to adjust the position of the limiting plate, precisely controlling the distance the needle 23 is ejected. This step can also be adjusted before the syringe 2 is inserted into the launcher 10. Taking skull injection as an example, the handle 16 can be held with one or both hands. The middle finger touches the firing trigger 111, the index finger touches the unlock trigger 120, and the thumb touches the injection button 130. Then, the firing tube 10 is aligned with the injection site, ensuring the buffer ring 141 is in contact with the injection site. Once the buffer ring 141 is in contact with the injection site, the index finger first pulls the unlock trigger 120, which unlocks the firing trigger 111. Then, the middle finger pulls the firing trigger 111. These two actions can be almost seamlessly connected, i.e., pressed simultaneously. After the firing trigger 111 is pulled, the firing trigger 111, along with the limiting part 110, disengages from the notch 27 of the firing tube 10. At this point, the syringe 2 loses its limiting force and is pushed by the second spring. The elasticity of the second spring can be pre-designed to ensure that the needle 23 of the syringe 2 pierces the target site when it is ejected. After the second spring pushes the syringe 2, the syringe 2 moves at high speed in the firing tube 10, and the needle 23 of the syringe 2 extends out of the firing tube 10 and pierces the injection site. After piercing the injection site, the injection button 130 is pressed. Since the injection button 130 is connected to the injection lever 131, the rotation of the injection button 130 will cause the injection lever 131 to rotate together. Since the injection push rod 132 is facing the injection lever 131, when the injection lever 131 rotates, one end of the injection lever 131 is lifted, which can lift the injection push rod 132. Since the locking pin 26 has a fulcrum, the locking pin 26 can rotate around the fulcrum. When the injection push rod 132 contacts the left end of the locking pin 26, the right end will fall when the left end of the locking pin 26 is driven to rise, so that the locking pin 26 can be disengaged from the locking groove 25. The moment the locking pin 26 disengages from the slot 25, the drive rod 22 is no longer restricted, the compression spring 24 pushes the drive rod 22 to move, and the drive rod 22 pushes the piston 21 to slide to inject the drug.During this process, in order to allow for batch injection or adjustment of the injection volume, the locking pin 26 can be installed on the torsion spring 133, giving the locking pin 26 a reset capability. That is, when the injection button 130 is released, the torsion spring 133 will drive the locking pin 26 to rotate back to its initial state, and the locking pin 26 will then engage with another slot 25 to limit the drive rod 22. This allows for batch injection or control of the injection volume. Since there are multiple slots 25, batch injection can be achieved, and injection can also be stopped in a timely manner. The drug injection is thus completed.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An injection device, characterized in that: The device includes a syringe and a launcher. The launcher has a launch tube into which the syringe is inserted and a drive assembly that drives the needle of the syringe to exit the launch tube. A handle is mounted on the launch tube, and a trigger assembly is mounted on the handle for limiting or releasing the syringe. The syringe includes a cylinder, a piston slidably disposed within the cylinder, a drive rod connected to the piston, and a needle disposed at one end of the cylinder. The cylinder is slidably disposed within the launch tube, and the trigger assembly limits or releases the cylinder. The device includes a limiting member for restricting the movement of the drive rod within the cylinder, and a control assembly for releasing the limiting member from restricting the piston. The control assembly is disposed on the transmitter. The control assembly includes an injection key, an injection lever driven to rotate by the injection key, and an injection push rod driven to rise and fall by the injection lever. The injection push rod drives the limiting member to move to release the restriction on the piston. The limiting member has a fulcrum in the middle. When the injection push rod pushes one end of the limiting member, the limiting member rotates so that its other end leaves the drive rod.

2. The injection device as described in claim 1, characterized in that: A compression spring is sleeved on the drive rod, and the drive rod is provided with a plurality of slots, each of the slots being arranged sequentially along the length direction of the drive rod. The limiting member includes a locking pin that can be engaged into any of the slots.

3. The injection device as described in claim 1, characterized in that: The cylinder has a notch for the limiting portion of the trigger assembly to extend into the cylinder to limit the syringe.

4. The injection device as described in claim 3, characterized in that: The trigger assembly has a firing trigger that drives the limiting portion out of the cylinder.

5. The injection device as described in claim 1, characterized in that: One end of the launch tube has an opening for inserting the syringe, and the opening is provided with an end cap.

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