Backflow prevention infusion device for intravenous therapy

Abstract

The invention discloses an anti-backflow infusion device for intravenous therapy, and relates to the technical field of intravenous therapy. A connecting assembly is arranged at the bottom of the body assembly, a guiding assembly is arranged at the bottom of the connecting assembly, a first anti-reverse assembly is arranged in the guiding assembly, a medicine adding assembly is arranged on the side face of the body assembly, and a mounting assembly is arranged at one end of the medicine adding assembly. A second anti-reversing assembly is arranged in the mounting assembly; the body assembly comprises an infusion tube, a bottle plug puncture needle and an injection needle, the first anti-reverse assembly is arranged close to the bottle plug puncture needle, liquid medicine in the infusion tube is prevented from flowing back into a bottle to pollute the bottle, the second anti-reverse assembly is installed at the position close to the injection needle, stable and timely flow blocking is carried out during backflow, and the anti-reverse effect is achieved. And unpowered flow choking is arranged, so that the cost is lower while stable backflow prevention is guaranteed, the poor backflow prevention effect caused by shaking and other external factors is avoided, and the backflow prevention process can be more stable.

Description

Technical Field

[0001] This invention relates to the field of intravenous therapy technology, specifically to an anti-backflow infusion device for intravenous therapy. Background Technology

[0002] Infusion sets are common sterile medical consumables that establish a channel between a vein and the medication, using atmospheric pressure and hydrostatic pressure to deliver large amounts of sterile fluids, electrolytes, and drugs into the body via a vein. It is one of the most important methods of drug administration in clinical practice. However, the infusion sets currently used for intravenous administration may have some shortcomings. For example, backflow of the medication may occur during the infusion process, causing inconvenience or risks to the treatment.

[0003] Currently available intravenous infusion devices for intravenous therapy have the following problems in actual use: When delivering medication through the infusion tubing, backflow of the medication may occur during the flow, causing inconvenience or risk to the treatment. While regulators are typically used in conjunction with check valves to prevent backflow, these anti-backflow structures are costly and have limited applicability in general medical settings. Furthermore, single-layer anti-backflow systems can easily allow medication to flow back into the bottle, contaminating other medications within the bottle. External factors such as shaking can also negatively impact the anti-backflow effect, leading to instability in the anti-backflow process. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides an anti-backflow infusion device for intravenous therapy, which has advantages such as multi-layer anti-backflow and more adaptable anti-backflow methods set according to different locations, thus solving the problem of poor stability in the anti-backflow process.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention provides the following technical solution: an anti-backflow infusion device for intravenous therapy, comprising a main body assembly; a connecting assembly is provided at the bottom of the main body assembly, a guiding assembly is provided at the bottom of the connecting assembly, a first anti-backflow assembly is provided inside the guiding assembly, a drug delivery assembly is provided on the side of the main body assembly, an installation assembly is provided at one end of the drug delivery assembly, and a second anti-backflow assembly is provided inside the installation assembly; the main body assembly includes an infusion tubing, a stopper puncture needle, and an injection needle, the stopper puncture needle being located at one end of the infusion tubing, and the injection needle being located at the other end of the infusion tubing.

[0008] Preferably, the connecting component has an on / off component inside, and the mounting component has a locking component at its bottom.

[0009] Preferably, the connecting assembly includes a connecting cap, the top of which is fixedly connected to the bottom of the bottle stopper puncture needle, a vent cap is fixedly installed on the side of the connecting cap, a connecting tube is rotatably connected to the bottom of the connecting cap, and a drip head is fixedly connected to the inner bottom of the connecting cap, with one end of the drip head communicating with one end of the bottle stopper puncture needle.

[0010] Preferably, the switching assembly includes an inner cylinder and an outer cylinder. The top of the inner cylinder is fixedly connected to the bottom of the connecting cap. A first slot is provided on the side of the inner cylinder. The top of the outer cylinder is fixedly connected to the inside of the connecting pipe. A second slot is provided on the side of the outer cylinder. The outside of the inner cylinder is in close contact with the inside of the outer cylinder.

[0011] Preferably, the guiding assembly includes a conduit, the top of which is fixedly connected to the bottom of a connecting tube, a liquid storage cylinder is fixedly connected to the bottom of the conduit, a guide cylinder is fixedly connected to the bottom of the liquid storage cylinder, a filter plate is fixedly connected inside the guide cylinder, and the bottom of the guide cylinder is fixedly connected to one end of the infusion tube.

[0012] Preferably, the first anti-reverse component includes a sealing head, the side of which is slidably connected to the inside of the conduit, a movable tube is fixedly connected to the bottom of the sealing head, a through groove is provided on the side of the movable tube, and an anti-reverse head is fixedly connected to one end of the movable tube.

[0013] Preferably, the drug delivery assembly includes a drug delivery tube, the side of which is fixedly connected to the other end of the infusion tube, a rubber cap is fitted onto one end of the drug delivery tube, and a needle is fixedly connected to the other end of the drug delivery tube.

[0014] Preferably, the mounting assembly includes a cap, the top of which is fixedly connected to the other end of the syringe, a mounting cylinder is fixedly connected to the bottom of the cap, a rubber ring is fixedly connected to one end of the mounting cylinder, and a base is fixedly connected to the bottom of the mounting cylinder.

[0015] Preferably, the second anti-reverse component includes a fixing ring, the side of which is fixedly connected to the inner wall of the mounting cylinder, a movable frame is slidably connected inside the fixing ring, and an anti-reverse plug is fixedly connected inside the movable frame.

[0016] Preferably, the locking assembly includes a locking tube, the top of which is fixedly connected to the bottom of the base, a locking sleeve is fitted on the surface of the locking tube, and the locking tube is threadedly connected to one end of the injection needle through the locking sleeve.

[0017] (III) Beneficial Effects

[0018] Compared with the prior art, the present invention provides an anti-backflow infusion device for intravenous therapy, which has the following beneficial effects:

[0019] 1. This anti-backflow infusion device for intravenous therapy uses the downward flow of the medication to push the sealing head and the moving tube, allowing the medication to flow out through the side groove of the moving tube and into the guide cylinder. When the medication flows back, the medication pushes the anti-backflow head to make close contact with the surface of the storage cylinder, thereby blocking the backflow of liquid. The storage cylinder also avoids leakage when a large amount of liquid flows back. Furthermore, a first anti-backflow component is set near the puncture needle on the bottle stopper to prevent the medication in the infusion tube from flowing back into the bottle and contaminating other medications in the bottle. The anti-backflow process is also more stable and reliable.

[0020] 2. This anti-backflow infusion device for intravenous therapy uses medication to push an anti-backflow plug and a rubber ring together at one end of the mounting cylinder, creating a gap. The anti-backflow plug then moves a movable frame inside a fixed ring, ensuring the stability of the anti-backflow plug and the movable frame during use. When the medication flows back, it pushes the anti-backflow plug into tight contact with the rubber ring, forming a seal. This provides a stable anti-backflow effect. Furthermore, a second anti-backflow component is installed near the injection needle for stable and timely flow control during backflow. The non-powered flow control ensures stable backflow while reducing costs. The second anti-backflow component is attached to the patient's arm along with the injection needle, preventing shaking and other external factors from affecting the anti-backflow effect, thus making the anti-backflow process more stable. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of an anti-backflow infusion device for intravenous therapy proposed in this invention.

[0022] Figure 2 This is a schematic diagram of the main body component structure of an anti-backflow infusion device for intravenous therapy proposed in this invention;

[0023] Figure 3 This is a schematic diagram of the connection component structure of an anti-backflow infusion device for intravenous therapy proposed in this invention;

[0024] Figure 4 This is a schematic diagram of the on / off component structure of an anti-backflow infusion device for intravenous therapy proposed in this invention;

[0025] Figure 5 This is a schematic diagram of the guiding component structure of an anti-backflow infusion device for intravenous therapy proposed in this invention;

[0026] Figure 6 This invention provides an anti-backflow infusion device for intravenous therapy. Figure 2 Enlarged structural diagram at point A in the middle;

[0027] Figure 7 This is a schematic diagram of the locking component structure of an anti-backflow infusion device for intravenous therapy proposed in this invention;

[0028] Figure 8 This is a schematic diagram of the installation components of an anti-backflow infusion device for intravenous therapy proposed in this invention.

[0029] In the diagram: 1. Main body assembly; 101. Infusion tubing; 102. Bottle stopper puncture needle; 103. Injection needle; 2. Connecting assembly; 201. Connecting cap; 202. Vent cap; 203. Connecting tube; 204. Dropper head; 3. On / off assembly; 301. Inner cylinder; 302. First slot; 303. Outer cylinder; 304. Second slot; 4. Guiding assembly; 401. Guide tube; 402. Liquid storage cylinder; 403. Guide cylinder; 404. Filter plate; 5. First anti-reverse flow device. Components; 501, sealing head; 502, moving tube; 503, through groove; 504, anti-reverse head; 6, dosing assembly; 601, dosing tube; 602, rubber cap; 603, needle tube; 7, mounting assembly; 701, cap; 702, mounting cylinder; 703, rubber ring; 704, base; 8, second anti-reverse assembly; 801, fixing ring; 802, moving frame; 803, anti-reverse plug; 9, locking assembly; 901, locking tube; 902, locking sleeve. Detailed Implementation

[0030] 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.

[0031] Please see Figures 1 to 8 This invention provides an anti-backflow infusion device for intravenous therapy. This device is applied in intravenous therapy scenarios. In this embodiment, the structure of the intravenous infusion device is improved to provide stable anti-backflow. Specifically, taking an infusion device as an example, as a preferred embodiment, the infusion device is specifically an anti-backflow infusion device for intravenous therapy, capable of stably preventing backflow during intravenous therapy.

[0032] Please see Figures 1 to 8 The present invention provides a technical solution: an anti-backflow infusion device for intravenous therapy, which is mainly used in intravenous therapy scenarios.

[0033] A connecting component 2 is provided at the bottom of the main body component 1. A switching component 3 is provided inside the connecting component 2. A guide component 4 is provided at the bottom of the connecting component 2. A first anti-reverse component 5 is provided inside the guide component 4. A dosing component 6 is provided on the side of the main body component 1. An installation component 7 is provided at one end of the dosing component 6. A second anti-reverse component 8 is provided inside the installation component 7. A locking component 9 is provided at the bottom of the installation component 7.

[0034] The main body component 1 includes an infusion tube 101, a stopper puncture needle 102, and an injection needle 103. The stopper puncture needle 102 is located at one end of the infusion tube 101, and the injection needle 103 is located at the other end of the infusion tube 101. The stopper puncture needle 102 is connected to the medicine bottle, and the injection needle 103 is inserted into the patient's vein, so that the medicine liquid inside the medicine bottle enters the patient's skin through the conduction of the infusion tube 101.

[0035] The connecting component 2 includes a connecting cap 201, the top of which is fixedly connected to the bottom of the bottle stopper puncture needle 102. A vent cap 202 is fixedly installed on the side of the connecting cap 201. A connecting tube 203 is rotatably connected to the bottom of the connecting cap 201. A drip head 204 is fixedly connected to the inner bottom of the connecting cap 201. One end of the drip head 204 is connected to one end of the bottle stopper puncture needle 102. The medicine drips through the drip head 204 at the inner bottom of the connecting cap 201 after being punctured by the bottle stopper, so that the medicine enters the interior of the connecting tube 203 and flows out at its bottom. The connecting tube 203 is made of transparent material to facilitate observation of the internal situation. The vent cap 202 ensures stable air pressure when the medicine flows.

[0036] The on / off assembly 3 includes an inner cylinder 301 and an outer cylinder 303. The top of the inner cylinder 301 is fixedly connected to the bottom of the connecting cap 201. A first slot 302 is provided on the side of the inner cylinder 301. The top of the outer cylinder 303 is fixedly connected to the inside of the connecting pipe 203. A second slot 304 is provided on the side of the outer cylinder 303. The outside of the inner cylinder 301 is in close contact with the inside of the outer cylinder 303. By manually rotating the connecting pipe 203 at the bottom of the connecting cap 201, the connecting pipe 203 drives the outer cylinder 303 to rotate on the surface of the inner cylinder 301, thereby causing the first slot 302 and the second slot 304 to be misaligned, so that the medicine dripped from the dripping head 204 flows down the inner wall of the connecting pipe 203 through the first slot 302 on the side of the inner cylinder 301 and the second slot 304 on the outer cylinder 303 and flows out at its bottom.

[0037] The guiding assembly 4 includes a conduit 401, the top of which is fixedly connected to the bottom of the connecting tube 203. A liquid storage cylinder 402 is fixedly connected to the bottom of the conduit 401, and a guide cylinder 403 is fixedly connected to the bottom of the liquid storage cylinder 402. A filter plate 404 is fixedly connected inside the guide cylinder 403, and the bottom of the guide cylinder 403 is fixedly connected to one end of the infusion tube 101. The medicine enters the guide cylinder 403 through the conduit 401 and the moving tube 502, and the medicine enters the infusion tube 101 after being filtered by the filter plate 404.

[0038] The first anti-backflow component 5 includes a sealing head 501, the side of which is slidably connected to the inside of the conduit 401. A moving tube 502 is fixedly connected to the bottom of the sealing head 501. A through groove 503 is opened on the side of the moving tube 502. An anti-backflow head 504 is fixedly connected to one end of the moving tube 502. The downward flow of the medicine pushes the sealing head 501 and the moving tube 502, so that the medicine flows out of the through groove 503 on the side of the moving tube 502 and enters the guide cylinder 403. When the medicine flows back, the medicine pushes the anti-backflow head 504 to come into close contact with the surface of the liquid storage cylinder 402, thereby blocking the backflow of the liquid. The liquid storage cylinder 402 avoids the seepage when a large amount of liquid flows back. The first anti-backflow component 5 is set near the bottle stopper puncture needle 102 to prevent the medicine in the infusion tube 101 from flowing back into the bottle and contaminating other medicines in the bottle. The anti-backflow process is more stable and reliable.

[0039] The drug delivery assembly 6 includes a drug delivery tube 601, the side of which is fixedly connected to the other end of the infusion tube 101. A rubber cap 602 is fitted onto one end of the drug delivery tube 601, and a needle tube 603 is fixedly connected to the other end of the drug delivery tube 601. The drug solution inside the infusion tube 101 enters the needle tube 603 through the drug delivery tube 601 for drug delivery guidance, and the drug delivery operation can be performed by puncturing the rubber cap 602 from the outside.

[0040] The mounting assembly 7 includes a cap 701, the top of which is fixedly connected to the other end of the syringe 603. The bottom of the cap 701 is fixedly connected to a mounting cylinder 702. One end of the mounting cylinder 702 is fixedly connected to a rubber ring 703, and the bottom of the mounting cylinder 702 is fixedly connected to a base 704. The medication flows through the syringe 603 and into the mounting cylinder 702 through the cap 701, and the medication flows out through the base 704 at the bottom of the mounting cylinder 702.

[0041] The second anti-reverse component 8 includes a fixing ring 801, the side of which is fixedly connected to the inner wall of the mounting cylinder 702. A movable frame 802 is slidably connected inside the fixing ring 801, and an anti-reverse plug 803 is fixedly connected inside the movable frame 802. When a liquid is applied to one end of the mounting cylinder 702, it pushes the anti-reverse plug 803 to form a gap with the rubber ring 703. At this time, the anti-reverse plug 803 drives the movable frame 802 to slide inside the fixing ring 801, thereby ensuring the stability of the anti-reverse plug 803 and the movable frame 802 during use. When the medication flows back, it pushes the anti-backflow plug 803 into close contact with the rubber ring 703 to form a seal, thereby enabling the second anti-backflow component 8 to achieve a stable anti-backflow effect. Furthermore, by installing the second anti-backflow component 8 near the injection needle 103, it provides stable and timely flow blocking during backflow. The non-powered flow blocking method ensures stable anti-backflow while reducing costs. This allows the second anti-backflow component 8 and the injection needle 103 to be attached to the patient's arm, avoiding shaking and other external factors that could cause poor anti-backflow performance, thus making the anti-backflow process more stable.

[0042] The locking component 9 includes a locking tube 901, the top of which is fixedly connected to the bottom of the base 704. A locking sleeve 902 is fitted on the surface of the locking tube 901. The locking tube 901 is threadedly connected to one end of the injection needle 103 through the locking sleeve 902. The liquid medicine flowing out through the base 704 enters the patient's skin through the locking tube 901 and the injection needle 103. The locking sleeve 902 facilitates a quick and stable connection between the injection needle 103 and the locking tube 901.

[0043] In summary, this anti-backflow infusion device for intravenous therapy should be used as follows:

[0044] 1. The liquid medicine drips through the dropper 204 at the bottom of the connecting cap 201 after being pierced by the bottle stopper, allowing the liquid medicine to enter the connecting tube 203 and flow out at its bottom. The connecting tube 203 is made of transparent material to facilitate observation of the internal situation, and the vent cap 202 ensures stable air pressure when the liquid medicine flows. The connecting tube 203 is manually rotated at the bottom of the connecting cap 201. At this time, the connecting tube 203 drives the outer cylinder 303 to rotate on the surface of the inner cylinder 301, thereby causing the first slot 302 and the second slot 304 to be misaligned, so that the liquid medicine dripping from the dropper 204 flows down the inner wall of the connecting tube 203 through the first slot 302 on the side of the inner cylinder 301 and the second slot 304 on the outer cylinder 303 and flows out at its bottom.

[0045] 2. The medicine enters the guide tube 403 through the conduit 401 and the moving tube 502, and enters the infusion tube 101 through the filter plate 404. The medicine flows down and pushes the sealing head 501 and the moving tube 502, so that the medicine flows out through the groove 503 on the side of the moving tube 502 and enters the guide tube 403. When the medicine flows back, the medicine pushes the anti-backflow head 504 to come into close contact with the surface of the storage cylinder 402, thereby blocking the backflow of liquid. The storage cylinder 402 avoids the seepage when a large amount of liquid flows back. The first anti-backflow component 5 is set near the bottle stopper puncture needle 102 to prevent the medicine in the infusion tube 101 from flowing back into the bottle and contaminating other medicines in the bottle. The anti-backflow process is more stable and reliable.

[0046] 3. The liquid medicine flows through the needle tube 603 and enters the mounting cylinder 702 through the cap 701. The liquid medicine flows out through the bottom support 704 at the bottom of the mounting cylinder 702. The liquid medicine pushes the anti-backflow plug 803 and the rubber ring 703 to form a gap at one end of the mounting cylinder 702. At this time, the anti-backflow plug 803 drives the moving frame 802 to slide inside the fixed ring 801, so that the fixed ring 801 ensures the stability of the anti-backflow plug 803 and the moving frame 802 during use. When the liquid medicine flows back, it can push the anti-backflow plug 803 to make tight contact with the rubber ring 703 to form a seal, thereby enabling the second anti-backflow component 8 to have a stable anti-backflow effect. The second anti-backflow component 8 is installed near the injection needle 103 to stably and timely block the flow when it flows back.

[0047] 4. The bottle stopper puncture needle 102 is connected to the medicine bottle, and the injection needle 103 is inserted into the patient's vein. The medicine inside the medicine bottle is then conducted into the patient's skin through the infusion tube 101. The medicine inside the infusion tube 101 is guided into the needle tube 603 through the drug delivery tube 601. The drug delivery can be performed by puncturing the rubber cap 602 from the outside. The medicine flowing out of the base 704 enters the patient's skin through the locking tube 901 and the injection needle 103. The locking sleeve 902 is provided to facilitate a quick and stable connection between the injection needle 103 and the locking tube 901.

[0048] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one" does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0049] 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. A backflow prevention infusion device for intravenous therapy, characterized in that, Includes the ontology component (1); The main body component (1) is provided with a connecting component (2) at its bottom, a guiding component (4) is provided at its bottom, a first anti-reverse component (5) is provided inside the guiding component (4), a dosing component (6) is provided on the side of the main body component (1), an installation component (7) is provided at one end of the dosing component (6), and a second anti-reverse component (8) is provided inside the installation component (7). The main body assembly (1) includes an infusion tube (101), a stopper puncture needle (102), and an injection needle (103). The stopper puncture needle (102) is located at one end of the infusion tube (101), and the injection needle (103) is located at the other end of the infusion tube (101).

2. The anti-backflow infusion device for intravenous therapy according to claim 1, characterized in that: The connecting component (2) is provided with an on / off component (3) inside, and the mounting component (7) is provided with a locking component (9) at its bottom.

3. The anti-backflow infusion device for intravenous therapy according to claim 1, characterized in that: The connecting assembly (2) includes a connecting cap (201), the top of which is fixedly connected to the bottom of the bottle stopper puncture needle (102), a vent cap (202) is fixedly installed on the side of the connecting cap (201), a connecting tube (203) is rotatably connected to the bottom of the connecting cap (201), and a drip head (204) is fixedly connected to the inner bottom of the connecting cap (201), one end of which is connected to one end of the bottle stopper puncture needle (102).

4. The anti-backflow infusion device for intravenous therapy according to claim 1, characterized in that: The switching assembly (3) includes an inner cylinder (301) and an outer cylinder (303). The top of the inner cylinder (301) is fixedly connected to the bottom of the connecting cap (201). A first slot (302) is provided on the side of the inner cylinder (301). The top of the outer cylinder (303) is fixedly connected to the inside of the connecting pipe (203). A second slot (304) is provided on the side of the outer cylinder (303). The outside of the inner cylinder (301) is in close contact with the inside of the outer cylinder (303).

5. The anti-backflow infusion device for intravenous therapy according to claim 1, characterized in that: The guiding assembly (4) includes a conduit (401), the top of which is fixedly connected to the bottom of a connecting tube (203), a liquid storage cylinder (402) is fixedly connected to the bottom of the conduit (401), a guide cylinder (403) is fixedly connected to the bottom of the liquid storage cylinder (402), a filter plate (404) is fixedly connected inside the guide cylinder (403), and the bottom of the guide cylinder (403) is fixedly connected to one end of an infusion tube (101).

6. The anti-backflow infusion device for intravenous therapy according to claim 1, characterized in that: The first anti-reverse component (5) includes a sealing head (501), the side of the sealing head (501) is slidably connected to the inside of the conduit (401), a movable tube (502) is fixedly connected to the bottom of the sealing head (501), a through groove (503) is opened on the side of the movable tube (502), and an anti-reverse head (504) is fixedly connected to one end of the movable tube (502).

7. The anti-backflow infusion device for intravenous therapy according to claim 1, characterized in that: The drug delivery assembly (6) includes a drug delivery tube (601), the side of which is fixedly connected to the other end of the infusion tube (101), a rubber cap (602) is fitted onto one end of the drug delivery tube (601), and a needle tube (603) is fixedly connected to the other end of the drug delivery tube (601).

8. The anti-backflow infusion device for intravenous therapy according to claim 1, characterized in that: The mounting assembly (7) includes a cap (701), the top of which is fixedly connected to the other end of the syringe (603), the bottom of which is fixedly connected to an mounting cylinder (702), one end of which is fixedly connected to a rubber ring (703), and the bottom of which is fixedly connected to a base (704).

9. The anti-backflow infusion device for intravenous therapy according to claim 1, characterized in that: The second anti-reverse component (8) includes a fixing ring (801), the side of which is fixedly connected to the inner wall of the mounting cylinder (702), a movable frame (802) is slidably connected inside the fixing ring (801), and an anti-reverse plug (803) is fixedly connected inside the movable frame (802).

10. The anti-backflow infusion device for intravenous therapy according to claim 1, characterized in that: The locking assembly (9) includes a locking tube (901), the top of which is fixedly connected to the bottom of the base (704), and a locking sleeve (902) is fitted on the surface of the locking tube (901). The locking tube (901) is threadedly connected to one end of the injection needle (103) through the locking sleeve (902).

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