Injector and infusion equipment

Abstract

The utility model relates to the technical field of medical instruments, in particular to an injector and infusion equipment. The injector comprises a needle cylinder and a needle handle, the needle cylinder is provided with a first connecting end and an injection end, the needle handle is provided with a second connecting end and a pressing end, the second connecting end is configured to be connected with the first connecting end in a matched mode and used for connecting the needle handle into the needle cylinder, and a limiting part is arranged on the needle handle and can prevent the needle handle from moving in the needle cylinder. Wherein the limiting part is configured to be capable of rotating on the needle handle, so that a movable state and a positioning state exist between the limiting part and the needle handle, when the limiting part and the needle handle are in the movable state, the limiting part can be mounted on or dismounted from the needle handle, and when the limiting part and the needle handle are in the positioning state, the limiting part can be positioned on the needle handle. The infusion equipment comprises the injector. The injector and the infusion equipment provided by the utility model are favorable for accurately controlling the dosage of liquid medicine needing to be injected.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a syringe and an infusion device. Background Art

[0002] Currently, some medications have strict requirements for injection volume. Excessive injection may cause side effects, while insufficient injection may not achieve the desired effect. For example, in the case of anesthetic administration, excessive anesthetics can lead to serious risks and hazards, such as difficulty or even cessation of breathing, cardiovascular complications, coma, allergic reactions, and postoperative complications. While insufficient anesthetics can cause pain and discomfort, psychological impact, and even surgical difficulties and intraoperative accidents, strict and precise requirements for anesthetic dosage are imposed during surgery.

[0003] Existing syringes are composed of a needle tube and a piston rod, wherein the piston rod is embedded in the needle tube and can slide in the needle tube. When the piston rod is pushed, the piston rod slides in the needle tube, thereby injecting the liquid medicine in the needle tube into the patient's body.

[0004] When medical staff use syringes to inject liquid medicine into patients, they need to rely on manual pushing of the piston rod in traditional syringes, and judge the injection dosage by the naked eye. Due to manual errors, the injection dosage is easily inaccurate. Utility Model Content

[0005] The main purpose of the utility model is to provide a syringe and an infusion device, aiming to solve the technical problem that the injection dose is easily inaccurate when the push rod of the syringe is manually pushed for injection.

[0006] To achieve the above-mentioned purpose, the present invention provides a syringe comprising:

[0007] a syringe having a first connection end and an injection end;

[0008] A needle handle having a second connecting end and a pressing end, wherein the second connecting end is configured to cooperate with the first connecting end to connect the needle handle to the interior of the syringe, and the needle handle is provided with a limiting portion, which can prevent the needle handle from moving within the syringe;

[0009] In which, the limiting part is configured to be able to rotate on the needle handle so that there are an active state and a positioning state between the limiting part and the needle handle. When the limiting part and the needle handle are in the active state, the limiting part can be installed or removed from the needle handle. When the limiting part and the needle handle are in the positioning state, the limiting part can be positioned on the needle handle.

[0010] In some embodiments, a threaded protrusion is provided on the outer peripheral wall of the needle handle, and the inner peripheral wall of the limiting portion includes a smooth side wall and a groove side wall. The limiting portion is configured to be rotatable on the needle handle so that the threaded protrusion can be disposed opposite to the smooth side wall or the groove side wall;

[0011] Wherein, when the threaded protrusion is disposed opposite to the smooth side wall, the limiting portion and the needle handle are in the active state; when the threaded protrusion is disposed opposite to the groove side wall, the limiting portion and the needle handle are in the positioning state.

[0012] In some embodiments, a plurality of scale lines are spaced apart on the outer peripheral wall of the needle handle.

[0013] In some embodiments, the limiting portion is provided with a connection hole, and the limiting portion can be sleeved on the needle handle through the connection hole;

[0014] Wherein, the aperture of the syringe barrel is larger than the aperture of the connection hole.

[0015] In some embodiments, a plug body is provided at the second connection end, and the following is satisfied between the outer diameter L1 of the plug body and the aperture L2 of the syringe barrel: 0.95 ≤ L1 / L2 ≤ 0.98.

[0016] In some embodiments, the plug body is a structure made of an elastic material, an insertion groove is provided inside the plug body, and an insertion portion is provided at the second connection end. The insertion portion is configured to be able to be connected to the insertion groove to connect the plug body to the second connection end.

[0017] In some embodiments, the outside of the plug body has a spiral structure.

[0018] In some embodiments, a gland is provided at the pressing end, and friction patterns are provided on the surface of the gland.

[0019] In some embodiments, the syringe barrel is a structure made of a transparent material.

[0020] Correspondingly, the present utility model also provides an infusion device, including the syringe described in any of the above embodiments.

[0021] Compared with the prior art, the beneficial effects of the present utility model are:

[0022] The technical solution of the present utility model provides a syringe with a simple structure and convenient for accurately injecting a dose of a liquid medicine. When using the syringe to inject a liquid medicine, a limiter is first pre-installed on the needle handle. The installation position of the limiter on the needle handle can be determined according to the actual dose of the liquid medicine to be injected. In other words, when the actual dose of the liquid medicine to be injected is relatively large, the limiter can be installed at the end of the needle handle close to the pressing end. When the actual dose of the liquid medicine to be injected is relatively small, the limiter can be installed at the end close to the second connecting end of the needle handle. The second connecting end of the needle handle is then connected to the first connecting end of the syringe so that the needle handle is installed in the syringe. After the second connecting end and the first connecting end are installed, the needle handle can slide inside the syringe to inject the liquid medicine. As the needle handle is continuously pushed, the medicine is continuously injected from the syringe into the patient's body. When the needle handle is pushed to the position where the limiting portion and the syringe abut against each other, the limiting portion can prevent the needle handle from continuing to slide in the syringe. At this time, the medicine in the syringe can no longer be injected into the patient's body, thereby effectively controlling the dosage of the medicine injected into the patient's body, so that the actual injected dosage of the medicine is the predetermined dosage, achieving accurate injection of the medicine dosage, and avoiding medical accidents caused by excessive or insufficient dosage of the injected medicine.

[0023] Furthermore, when the stopper needs to be installed or removed from the needle handle, the stopper and the needle handle can be adjusted to an active state, allowing the stopper to move freely on the needle handle, allowing the user to move the stopper to the position where the desired dose of liquid medicine is to be injected. Once the stopper is positioned on the needle handle, the stopper and the needle handle can be adjusted to a fixed state, allowing the stopper to be fixed on the needle handle. Under the action of the stopper, the injection of liquid medicine will automatically stop, facilitating blind operation of the syringe by the user, avoiding distraction caused by the user looking at the scale while injecting, and ultimately ensuring accurate injection of the liquid medicine dose.

[0024] The infusion device using the above syringe is beneficial for quantitatively controlling the dosage of the injected liquid medicine. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0026] Figure 1 A schematic diagram of the overall structure of a syringe provided in one embodiment of the present utility model;

[0027] Figure 2An exploded view of the overall structure of a syringe provided in one embodiment of the present utility model;

[0028] Figure 3 A cross-sectional view of the overall structure of a syringe provided by one embodiment of the utility model;

[0029] Figure 4 This is a schematic diagram of the overall structure of the limiting part in the syringe provided by one embodiment of the utility model.

[0030] Description of Figure Numbers:

[0031] 100-syringe;

[0032] 110-first connection end; 120-injection end;

[0033] 200-needle handle;

[0034] 210 - second connection end; 220 - pressing end; 230 - threaded protrusion; 240 - scale line;

[0035] 211- plug body; 212- plug part;

[0036] 2111-plug-in groove;

[0037] 221- gland;

[0038] 2211-friction pattern;

[0039] 300-limiting part;

[0040] 310-connection hole;

[0041] 311-smooth sidewall; 312-grooved sidewall.

[0042] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0044] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, then such directional indications are only used to explain the relative positional relationship, movement conditions, etc. between components in a certain specific posture. If this specific posture changes, then the directional indications will also change accordingly.

[0045] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present utility model, then such descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or", "and / or" or "and / or" appear throughout the text, their meanings include three parallel scenarios. Taking "A and / or B" as an example, it includes scenario A, or scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0046] Currently, there are strict requirements for the injection volume of some liquid medicines. Injecting too much may cause side effects, and injecting too little may not achieve the expected effect. Exemplarily, for example, taking the administration of anesthetic as an example: Since an overdose of anesthetic may lead to various serious risks and hazards such as difficulty breathing or even cessation, cardiovascular complications, coma, allergic reactions, postoperative complications, etc., while too little anesthetic may cause pain and discomfort to the patient, psychological effects, and even surgical difficulties and intraoperative accidents. Therefore, during surgery, there are relatively strict and precise requirements for the dosage of anesthetic. [[ID=⑧]]

[0047] [[ID=⑨]]The existing syringe consists of a syringe barrel and a piston rod. The piston rod is inserted into the syringe barrel and can slide within the syringe barrel. By pushing the piston rod, the piston rod slides within the syringe barrel, thereby injecting the liquid medicine in the syringe barrel into the patient's body.

[0048] When medical staff use a syringe to inject liquid medicine into a patient, during the process of pushing the piston rod, the traditional syringe needs to rely on manual pushing of the syringe push rod and judge the injection dose by the naked eye. Due to human error, it is easy to cause inaccurate injection doses.

[0049] To solve the technical problem that it is easy to cause inaccurate injection doses when manually pushing the push rod of the syringe for injection, referring to Figures 1 to 4, an embodiment of the present utility model provides a syringe, which includes a syringe barrel 100 and a syringe handle 200. The syringe barrel 100 has a first connection end 110 and an injection end 120, and the syringe handle 200 has a second connection end 210 and a pressing end 220. The second connection end 210 is configured to cooperate with the first connection end 110 for connection to connect the syringe handle 200 inside the syringe barrel 100. A limiting portion 300 is provided on the syringe handle 200, and the limiting portion 300 can prevent the syringe handle 200 from moving within the syringe barrel 100. Among them, the limiting portion 300 is configured to be rotatable on the syringe handle 200 so that there are an active state and a positioning state between the limiting portion 300 and the syringe handle 200. When the limiting portion 300 and the syringe handle 200 are in the active state, the limiting portion 300 can be installed or removed from the syringe handle 200. When the limiting portion 300 and the syringe handle 200 are in the positioning state, the limiting portion 300 can be positioned on the syringe handle 200.

[0050] In the above syringe, the pressing end 220 is the operating end of the user's hand, and the injection end 120 is provided with a tightened injection port, which can be used to install a needle. When using the syringe, when the user presses the pressing end 220 with the hand, the liquid medicine will be injected at the injection end 120.

[0051] Specifically, to solve the above problems, in this embodiment, a syringe with a simple structure and convenient for accurately injecting the dose of liquid medicine is provided. When using this syringe to inject liquid medicine, first, the limiting portion 300 is installed on the syringe handle 200 in advance. The installation position of the limiting portion 300 on the syringe handle 200 can be determined according to the actual required dose of liquid medicine to be injected. In other words, when the actual required dose of liquid medicine to be injected is relatively large, the limiting portion 300 can be installed at one end close to the pressing end 220 of the syringe handle 200. When the actual required dose of liquid medicine to be injected is relatively small, the limiting portion 300 can be installed at one end close to the second connection end 210 of the syringe handle 200. Then, the second connection end 210 of the syringe handle 200 is connected to the first connection end 110 of the syringe barrel 100, so that the syringe handle 200 is installed inside the syringe barrel 100. After the second connection end 210 and the first connection end 110 are installed, the syringe handle 200 can slide inside the syringe barrel 100 to realize the injection action of the liquid medicine. As the syringe handle 200 is continuously pushed, the liquid medicine is continuously injected from the syringe barrel 100 into the patient's body. When the syringe handle 200 is pushed to the position where the limiting portion 300 abuts against the syringe barrel 100, the limiting portion 300 can prevent the syringe handle 200 from continuing to slide inside the syringe barrel 100. At this time, the liquid medicine in the syringe barrel 100 cannot be injected into the patient's body any more, so that the dose of the liquid medicine injected into the patient's body can be effectively controlled, making the actually injected dose of liquid medicine the pre-determined dose, realizing the accurate injection of the liquid medicine dose, and avoiding medical accidents caused by too large or too small dose of injected liquid medicine.

[0052] Furthermore, when the stopper 300 needs to be installed or removed from the needle handle 200, the stopper 300 and the needle handle 200 can be adjusted to an active state. At this time, the stopper 300 can move freely on the needle handle 200, and the user can move the stopper 300 to the position where the desired dose of liquid medicine is to be injected. After the position of the stopper 300 on the needle handle 200 is determined, the stopper 300 and the needle handle 200 can be adjusted to a fixed state. At this time, the stopper 300 can be fixedly positioned on the needle handle 200. Under the action of the stopper 300, the injection of liquid medicine will automatically stop, which is convenient for the user to operate the syringe blindly and avoids the user being distracted by looking at the scale while injecting, ultimately ensuring that the precise injection of the liquid medicine can be completed.

[0053] In some embodiments, reference Figures 1 to 4 The outer circumferential wall of the needle handle 200 is provided with threaded protrusions 230, and the threaded protrusions 230 are spaced uniformly. The inner circumferential wall of the stopper 300 includes a smooth sidewall 311 and a groove sidewall 312. The stopper 300 is configured to rotate on the needle handle 200 so that the threaded protrusions 230 can be positioned opposite the smooth sidewall 311 or the groove sidewall 312. When the threaded protrusions 230 and the smooth sidewall 311 are positioned opposite each other, the stopper 300 and the needle handle 200 are in an active state; when the threaded protrusions 230 and the groove sidewall 312 are positioned opposite each other, the stopper 300 and the needle handle 200 are in a positioned state.

[0054] Specifically, in this embodiment, a specific connection structure is provided between the limiting portion 300 and the needle handle 200. When the smooth side wall 311 of the limiting portion 300 and the threaded protrusion 230 of the needle handle 200 are opposite to each other, the smooth side wall 311 will not form a clamping connection with the threaded protrusion 230. At this time, the limiting portion 300 can move freely on the needle handle 200, so that the limiting portion 300 can be moved to the corresponding positioning position on the needle handle 200 according to the actual dosage of the injected liquid. When the groove side wall 312 of the limiting portion 300 and the threaded protrusion 230 of the needle handle 200 are opposite to each other, the groove side wall 312 will form a positioning engagement with the threaded protrusion 230. At this time, the limiting portion 300 is positioned on the needle handle 200 and cannot continue to move freely on the needle handle 200. Then, the needle handle 200 is pushed to inject the liquid medicine. When the limiting portion 300 and the syringe 100 abut, the needle handle 200 can no longer be pushed, which is conducive to achieving accurate and quantitative injection of the liquid medicine.

[0055] In some embodiments, reference Figure 2 The outer peripheral wall of the needle handle 200 is provided with a plurality of scale lines 240. The scale lines 240 are distributed on the arc surface between the thread protrusions 230 and match the evenly arranged thread protrusions 230 as a reference for the quantitative conditions of the injection liquid.

[0056] Further, by way of example, for instance, taking a syringe with a capacity of 10 ml as an example, ten scale lines 240 may be evenly spaced on the outer peripheral wall of the needle handle 200, and each scale line 240 corresponds to 1 ml respectively. When the dose of the liquid medicine to be injected is 5 ml, the limiting part 300 can be positioned at the 5 ml scale line 240 of the needle handle 200, so as to facilitate the subsequent accurate quantitative injection of the liquid medicine.

[0057] In some embodiments, referring to Figure 2 and Figure 4 , the limiting part 300 is provided with a connecting hole 310, and the limiting part 300 can be sleeved on the needle handle 200 through the connecting hole 310. Wherein, the aperture of the syringe barrel 100 is larger than the aperture of the connecting hole 310.

[0058] Specifically, in this embodiment, the aperture of the syringe barrel 100 (specifically referring to the outer diameter of the syringe barrel 100 here) is designed to be larger than the aperture of the connecting hole 310, so as to ensure that the syringe barrel 100 cannot move past the limiting part 300 and move towards the pressing end 220 of the needle handle 200, such that the needle handle 200 can only move towards the injection end 120 of the syringe barrel 100, thereby using the needle handle 200 to complete the extrusion injection of the liquid medicine inside the syringe barrel 100.

[0059] Further, referring to the above embodiments, a smooth side wall 311 and a groove side wall 312 can be provided on the inner peripheral wall of the connecting hole 310, so that the limiting part 300 and the needle handle 200 are in a movable state or a positioning state.

[0060] In some embodiments, referring to Figure 2 and Figure 3 , the second connecting end 210 is provided with a plug body 211, and the outer diameter L1 of the plug body 211 and the aperture L2 of the syringe barrel 100 satisfy: 0.95 ≤ L1 / L2 ≤ 0.98. By way of example, for instance, the value of L1 / L2 can be 0.95, 0.96, 0.97, 0.98, etc.

[0061] Specifically, in this embodiment, the outer diameter of the plug body 211 and the aperture of the syringe barrel 100 are designed to be approximately equal, so that when the needle handle 200 is installed inside the syringe barrel 100, it can be ensured that the plug body 211 can closely adhere to the inner side wall of the syringe barrel 100, thereby being beneficial to using the plug body 211 to isolate the liquid medicine on both sides of the plug body 211 and the air inside the syringe barrel 100. With such a structure, on the one hand, it is beneficial for the liquid medicine to be pushed out of the injection port under sufficient pressure, preventing the liquid medicine from flowing out through the gap between the plug body 211 and the inner side wall of the syringe barrel 100 when the liquid medicine is under pressure, resulting in the leakage of the liquid medicine from the syringe barrel 100; on the other hand, it is beneficial for the plug body 211 to provide a good sealing effect on the liquid medicine, reducing the pollution of the air inside the syringe barrel 100 to the liquid medicine and ensuring the efficacy of the liquid medicine.

[0062] In some embodiments, with reference to Figure 2 and Figure 3 , the plug body 211 is a structure made of an elastic material. Exemplarily, for example, the plug body 211 can be a structure made of a rubber material, that is, the plug body 211 can be a rubber plug. An insertion groove 2111 is provided inside the plug body 211, and the second connection end 210 is provided with an insertion portion 212. The insertion portion 212 is configured to be able to connect with the insertion groove 2111 to connect the plug body 211 to the second connection end 210.

[0063] Specifically, in this embodiment, a connection structure for connecting the plug body 211 to the needle handle 200 is provided. Since the plug body 211 is a structure made of an elastic material, the plug body 211 has good elastic deformation ability. When it is necessary to connect the plug body 211 to the second connection end 210, first stretch the plug body 211 outward. At this time, the plug body 211 will undergo elastic deformation, which is beneficial to expose the insertion groove 2111 outside, so as to facilitate the insertion portion 212 to be inserted into the insertion groove 2111, realizing the connection of the plug body 211 to the second connection end 210. After the insertion portion 212 is inserted into the insertion groove 2111, release the plug body 211. At this time, the plug body 211 will return to its initial state, which is beneficial to wrap the insertion portion 212 inside the plug body 211, realizing a stable connection between the plug body 211 and the needle handle 200.

[0064] Furthermore, in some other embodiments, another connection structure for connecting the plug body 211 to the needle handle 200 is provided. The plug body 211 and the needle handle 200 can also be an integrally formed structure. Compared with the detachable connection structure between the plug body 211 and the needle handle 200, the integrally formed structure between the plug body 211 and the needle handle 200 is beneficial to improve the connection stability between the plug body 211 and the needle handle 200. Since there is a large frictional resistance when the needle handle 200 moves inside the syringe barrel 100, if a detachable connection structure is adopted between the plug body 211 and the needle handle 200, it may cause the plug body 211 to fall off from the needle handle 200 during the movement of the needle handle 200, thus affecting the normal use of the syringe. However, when an integrally formed connection structure is adopted between the plug body 211 and the needle handle 200, there is no need to worry about the plug body 211 falling off.

[0065] In some embodiments, the outside of the plug body 211 has a spiral structure. (Not shown in the figure)

[0066] Specifically, in this embodiment, the outer part of the plug body 211 is designed as a spiral structure, which is beneficial to reducing the contact area between the plug body 211 and the inner wall of the syringe barrel 100, thereby reducing the frictional force between the plug body 211 and the inner wall of the syringe barrel 100. Moreover, adopting such a structure will also provide a space for elastic deformation when the plug body 211 and the inner wall of the syringe barrel 100 are in contact, which is beneficial to pushing the needle handle 200 to move in the syringe barrel 100 and also beneficial to making the seal between the plug body 211 and the inner wall of the syringe barrel 100 tighter.

[0067] In some embodiments, referring to Figures 1 to 3 , a gland 221 is provided on the pressing end 220, and friction patterns 2211 are provided on the surface of the gland 221.

[0068] Specifically, in this embodiment, by providing the gland 221 on the pressing end 220, it is beneficial for the user to push the needle handle 200. The gland 221 is used to manually squeeze to form an internal pressure on the syringe barrel 100 to achieve the injection purpose. By providing the friction patterns 2211 on the surface of the gland 221, it is beneficial to increase the frictional force between the user's hand and the gland 221, prevent the user from slipping during operation, and thus improve the stability of the syringe during use.

[0069] In some embodiments, the syringe barrel 100 is made of a transparent material. Exemplarily, for example, the syringe barrel 100 can be made of a transparent plastic. The syringe barrel 100 adopting a transparent structure is beneficial to observing the liquid medicine inside the syringe barrel 100 and is also beneficial to observing the scale lines 240 on the needle handle 200, so as to achieve a secondary confirmation of the injection dose of the liquid medicine.

[0070] Correspondingly, another embodiment of the present invention also provides an infusion device, which includes the syringe in any of the above embodiments.

[0071] Specifically, in this embodiment, the infusion device applying the above syringe is beneficial to quantitatively control the dose of the injected liquid medicine.

[0072] Benefiting from the improvement of the above syringe, the infusion device of this embodiment has the same technical effects as the above syringe, which will not be elaborated here.

[0073] It should be noted that other contents of the syringe and infusion device disclosed by the present invention can be referred to the prior art, which will not be elaborated here.

[0074] The above are only the preferred embodiments of the present utility model, and do not thereby limit the patent scope of the present utility model. Any equivalent structural transformation made under the inventive concept of the present utility model by using the content of the specification and drawings of the present utility model, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present utility model.

Claims

1. Syringe, characterized in that, Comprising: A syringe barrel having a first connection end and an injection end; A syringe handle having a second connection end and a pressing end, the second connection end being configured to cooperate with the first connection end for connecting the syringe handle to the inside of the syringe barrel, a limiting portion being provided on the syringe handle, and the limiting portion being capable of preventing the syringe handle from moving within the syringe barrel; Wherein, the limiting portion is configured to be rotatable on the syringe handle so that there are an active state and a positioning state between the limiting portion and the syringe handle. When the limiting portion and the syringe handle are in the active state, the limiting portion can be mounted or disassembled from the syringe handle. When the limiting portion and the syringe handle are in the positioning state, the limiting portion can be positioned on the syringe handle.

2. The syringe according to claim 1, wherein Threaded protrusions are provided on the outer peripheral wall of the syringe handle, and the inner peripheral wall of the limiting portion includes a smooth side wall and a groove side wall. The limiting portion is configured to be rotatable on the syringe handle so that the threaded protrusions can be disposed opposite to the smooth side wall or the groove side wall; Wherein, when the threaded protrusions are disposed opposite to the smooth side wall, the limiting portion and the syringe handle are in the active state; when the threaded protrusions are disposed opposite to the groove side wall, the limiting portion and the syringe handle are in the positioning state.

3. The syringe according to claim 1, characterized in that, A plurality of scale lines are provided at intervals on the outer peripheral wall of the syringe handle.

4. The syringe according to claim 1, wherein The limiting portion is provided with a connection hole, and the limiting portion can be sleeved on the syringe handle through the connection hole; Wherein, the aperture of the syringe barrel is larger than the aperture of the connection hole.

5. The syringe according to claim 1, characterized in that, The second connection end is provided with a plug body, and the outer diameter L1 of the plug body and the aperture L2 of the syringe barrel satisfy: 0.95 ≤ L1 / L2 ≤ 0.

98.

6. The syringe according to claim 5, characterized in that, The plug body is a structure made of an elastic material, an insertion groove is provided inside the plug body, and the second connection end is provided with an insertion portion, and the insertion portion is configured to be capable of connecting with the insertion groove to connect the plug body to the second connection end.

7. The syringe according to claim 6, characterized in that, The outside of the plug body is in a spiral structure.

8. The syringe according to claim 1, characterized in that, The pressing end is provided with a gland, and friction patterns are provided on the surface of the gland.

9. The syringe according to claim 1, characterized in that, The syringe barrel is a structure made of a transparent material.

10. Infusion device, characterized in that, Including the syringe according to any one of claims 1 to 9.

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