Local administration device for oral medicine treatment

Abstract

The invention relates to the field of medicine instruments, and discloses a local administration device for oral medicine treatment, which comprises a medicine inlet tube, a rubber plunger column is slidably mounted in the medicine inlet tube, an injection rod is fixedly mounted on the side part of the rubber plunger column, an injection connector is fixedly mounted on the side part of the medicine inlet tube far away from one side of the rubber plunger column, and the injection connector is fixedly connected with the rubber plunger column. An adjusting device is installed on the outer portion of the injection connector in a threaded mode. The purpose of adjusting the injection needle tube through an adjusting ball ring and an adjusting part in the adjusting device is achieved, the purpose of conveniently applying medicine to the interior of the cavity through the injection needle tube is achieved, by adjusting a second limiting part, the adjusting part in a backflow preventing part can be locked, the direction after adjustment is fixed, and by means of the backflow preventing part in the adjusting part, the medicine feeding effect is improved. The problem that when the injection needle tube is used for dosing, liquid medicine in the injection needle tube flows back, and the liquid medicine in the injection connector and the medicine inlet tube is polluted is solved.

Description

Technical Field

[0001] This invention relates to the field of drug delivery technology, and more specifically, to a local drug delivery device for oral medicine treatment. Background Technology

[0002] Oral endodontics is an important branch of oral medicine, focusing on the diagnosis and treatment of non-surgical diseases of the teeth, pulp, periapical tissues, and oral mucosa. Its core principle is to eliminate lesions and preserve natural teeth through minimally invasive and precise interventions. Specialized drug delivery devices play a crucial role in achieving this goal. For example, dental syringes can precisely deliver anesthetics to the affected area; delivery needles for root canal treatment can place medication deep into narrow root canals; and oral sprays facilitate even coverage of the mucosa with medication. These devices extend the dentist's treatment capabilities, enabling medications to act more safely and efficiently on specific targets, and are indispensable tools for achieving precise and comfortable treatment in oral endodontics.

[0003] Patent CN220175847U discloses a local drug delivery device for oral cavity treatment, including a drug delivery device shell, a mounting baffle, and a receiving tube. A drug inlet tube is fixedly connected to the upper surface of the drug delivery device shell, and a drug dispensing push plate is installed through one end of the shell. One end of the shell is open, and the mounting baffle is located at that end. A covering ring is fixed to the surface of the mounting baffle facing the shell. A limiting disc and a dispensing head are provided. During operation, the limiting disc is pressed against the surface to be treated, and then the dispensing push plate and dispensing piston are pushed to guide the medication into the dispensing head. The dispensing head sprays the medication evenly through the dispensing nozzle on the surface, improving the uniformity of medication application. The limiting disc collects and blocks excess medication, preventing accidental ingestion by the patient.

[0004] While the aforementioned device can improve the uniformity of medication application, it is inconvenient due to the fact that the medication is applied in the oral cavity. The direction of the device cannot be adjusted and can only be achieved by manually rotating the applicator or bending the applicator head, which is quite inconvenient. Furthermore, during medication application, there is a possibility of backflow when the medication head comes into contact with the oral cavity, which can cause medication contamination. Summary of the Invention

[0005] This invention provides a local drug delivery device for oral cavity treatment, which solves the technical problems of related technologies where the drug is applied in the oral cavity, resulting in many inconvenient angles, inability to adjust the direction of the device, and the need to manually rotate the drug delivery device or bend the drug delivery head, which is quite inconvenient. In addition, during drug delivery, the drug delivery head may flow back into the oral cavity, causing drug contamination.

[0006] This invention provides a local drug delivery device for oral cavity treatment, comprising a drug inlet tube, a rubber plunger slidably mounted inside the drug inlet tube, an injection rod fixedly mounted on the side of the rubber plunger, an injection connector fixedly mounted on the side of the drug inlet tube away from the rubber plunger, an adjustment device threaded onto the external thread of the injection connector, and an injection needle tube disposed at the end of the adjustment device away from the injection connector. The adjustment device is used to adjust the direction of the injection needle tube to prevent backflow during injection. The adjustment device includes a first mounting ring, a first limiting member, a second limiting member, and an adjustment mechanism. The injection connector includes a ball ring, an anti-backflow component, and an adjusting component. A first mounting ring is threaded onto the external surface of the injection connector. A first limiting component is slidably mounted on the outside of the first mounting ring. An adjusting ball ring is slidably mounted inside the first mounting ring. An adjusting component is movably mounted inside the adjusting ball ring. The first limiting component limits the adjusting component. A second limiting component is fixedly mounted on the outside of the adjusting ball ring, limiting the first limiting component. An anti-backflow component is provided inside the adjusting component to prevent backflow of liquid from the injection needle tube. The adjusting component is used to adjust the direction of the injection needle tube.

[0007] As a further optimization of the present invention, a symmetrically mounted following slip ring is sleeved on the outside of the first mounting ring. The first limiting member includes a first slip ring slidably mounted on the outside of the first mounting ring. A symmetrically arranged first sliding column is fixedly mounted on the side of the first slip ring. The first sliding column is sleeved on the following slip ring. A first limiting block is fixedly mounted on the end of the first sliding column. A first spring is fixedly mounted on the side of the first limiting block. The first spring is concentric with the first sliding column. A pressing rod is fixedly mounted on the end of the first limiting block. The pressing rod is inserted into the inside of the adjusting ball ring and contacts the adjusting member to limit the adjusting member.

[0008] As a further optimization of the present invention, the second limiting member is slidably installed on the first U-shaped limiting block outside the first slip ring, the side of the first U-shaped limiting block is fixedly installed with a second limiting rod, the outside of the adjusting ball ring is fixedly installed with a first fixing plate, the second limiting rod is slidably installed on the end of the first fixing plate, the end of the second limiting rod is fixedly installed with a second U-shaped limiting block, and the inside of the second U-shaped limiting block is rotatably installed with a first rotating plate.

[0009] As a further optimization of the present invention, the second limiting member includes a second support block fixedly installed outside the adjusting ball ring, a rotating semicircular block rotatably installed at the end of the second support block, a connecting plate fixedly installed on the rotating semicircular block, the connecting plate being connected to the end of the first rotating plate, and a first rotating handle fixedly installed on the side of the rotating semicircular block.

[0010] As a further optimization of the present invention, the adjusting component includes a first adjusting ball movably installed inside the adjusting ball ring. The first adjusting ball has a through hole inside and a first adapting groove and a second adapting groove inside. The first adapting groove and the second adapting groove are connected to the anti-backflow component to prevent the liquid inside the injection needle tube from flowing back.

[0011] As a further optimization of the present invention, the anti-backflow component includes an adjusting spring plate fixedly installed inside the through hole of the first adjusting ball. A first one-way ball is provided on one side of the first adaptation groove, and a second one-way ball is provided on one side of the second adaptation groove. The adjusting spring plate is used to lift the first one-way ball and the second one-way ball. A second adjusting handle is fixedly installed on the side of the adjusting spring plate. A third limiting post is fixedly installed inside the first adjusting ball. A sealing protrusion is provided inside the first adjusting ball. The second adjusting handle is used to adjust the direction of the adjusting spring plate, and the sealing protrusion is used to seal the through hole inside the first adjusting ball.

[0012] As a further optimization of the present invention, an adjustment protrusion is fixedly installed on the outside of the first adjustment ball on the side away from the anti-backflow component, and the adjustment protrusion is used to limit the direction of the first adjustment ball.

[0013] As a further optimization of the present invention, the distance between the two extrusion rods is less than the outer diameter of the first adjusting ball, and the end of the extrusion rod is used to contact the outside of the first adjusting ball.

[0014] As a further optimization of the present invention, the first one-way ball and the second one-way ball have the same diameter, the diameter of the first one-way ball is smaller than the diameter of the through hole inside the first adjusting ball, and the diameters of the second adapting groove and the first adapting groove are smaller than the diameter of the first one-way ball.

[0015] As a further optimization of the present invention, rubber is provided at the connection opening between the adjusting ball ring and the first adjusting ball.

[0016] The beneficial effects of this invention are as follows: The present invention discloses a local drug delivery device for oral cavity treatment. The purpose of adjusting the injection needle is to adjust the internal adjusting ball ring and adjusting member of the device, so as to facilitate the drug delivery into the cavity. By adjusting the second limiting member, the adjusting member inside the anti-backflow member can be locked to fix the adjusted direction. The anti-backflow member inside the adjusting member prevents the drug solution inside the injection needle from flowing back during drug delivery, thus preventing the injection connector and the inside of the drug inlet tube from being contaminated. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the overall shape of the device of the present invention; Figure 2 This is a schematic diagram of the overall device installation of the present invention; Figure 3 This is a schematic diagram of the internal structure of the regulating device of the present invention; Figure 4 This is a schematic diagram of the internal structure connection of the regulating device of the present invention; Figure 5 This is a schematic diagram of the internal structure of the second limiting member of the present invention; Figure 6 This is a schematic diagram of the internal structure of the anti-backflow component of the present invention; Figure 7 This is a diagram showing the internal structure distribution of the adjusting component of the present invention; Figure 8 yes Figure 7 Enlarged view of point A in the middle.

[0018] In the picture: 1. Injection tube; 11. Injection rod; 12. Rubber plunger; 13. Injection connector; 14. Injection needle; 2. Adjustment device; 21. First mounting ring; 211. Following slip ring; 22. First limiting component; 221. First slip ring; 222. First sliding column; 223. First limiting block; 224. Extrusion rod; 225. First spring; 23. Second limiting component; 231. First U-shaped limiting block; 232. Second limiting rod; 233. First fixing plate; 234. Second U-shaped limiting block; 235. First rotating plate; 236. Second support block ; 237. Rotating semicircular block; 238. Connecting plate; 239. First rotating handle; 24. Adjusting ball ring; 25. Anti-backflow component; 251. First one-way ball; 252. Second one-way ball; 253. Adjusting spring; 254. Third limiting post; 255. Second adjusting handle; 26. Adjusting component; 261. First adjusting ball; 262. Adjusting protrusion; 263. First adapting groove; 264. Second adapting groove; 265. Sealing protrusion. Detailed Implementation

[0019] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.

[0020] like Figures 1 to 3As shown in the embodiment of the present invention, a local drug delivery device for oral cavity treatment includes a drug inlet tube 1. A rubber plunger 12 is slidably installed inside the drug inlet tube 1. An injection rod 11 is fixedly installed on the side of the rubber plunger 12. An injection connector 13 is fixedly installed on the side of the drug inlet tube 1 away from the rubber plunger 12. An adjustment device 2 is threaded on the outside of the injection connector 13. An injection needle tube 14 is provided at the end of the adjustment device 2 away from the injection connector 13. The adjustment device 2 is used to adjust the direction of the injection needle tube 14 to prevent backflow during injection. like Figures 2 to 5 As shown, the adjusting device 2 includes a first mounting ring 21, a first limiting member 22, a second limiting member 23, an adjusting ball ring 24, an anti-backflow member 25, and an adjusting member 26. The first mounting ring 21 is threaded onto the outside of the injection connector 13. The first limiting member 22 is slidably disposed on the outside of the first mounting ring 21. The adjusting ball ring 24 is slidably disposed inside the first mounting ring 21. The adjusting member 26 is movably disposed inside the adjusting ball ring 24. The first limiting member 22 is used to limit the adjusting member 26. The second limiting member 23 is fixedly disposed on the outside of the adjusting ball ring 24. The second limiting member 23 is used to limit the first limiting member 22. The anti-backflow member 25 is disposed inside the adjusting member 26 to prevent the liquid inside the injection needle tube 14 from flowing back. The adjusting member 26 is used to adjust the direction of the injection needle tube 14.

[0021] It should be noted that when administering medication inside the oral cavity, it is not advisable to manipulate the injection needle 14 to the corresponding location. Sometimes, it is necessary to bend the injection needle 14 for medication administration, which is quite troublesome. Furthermore, since the injection needle 14 contains medication during administration, when it is withdrawn, the medication in contact with the oral cavity may flow back, contaminating the medication inside the inlet tube 1 and rendering it unusable. Therefore, an adjustment device 2 is threaded onto the end of the injection connector 13. The first mounting ring 21 is rotated and mounted on the injection connector 13. At this time, the anti-backflow element 25 can be manually adjusted so that the adjustment element 26 can only draw in medication and not spray it out. Then, the injection needle 14 is inserted into the medication bottle to draw in the medication. After drawing in the medication, the anti-backflow element 25 is adjusted again to prevent the injection needle 14 from flowing back into the adjustment element 26 during administration. To facilitate adjustment of the position of the injection needle 14 during injection, this adjustment device can be manually... The second limiting member 23 is manually adjusted so that the first limiting member 22 releases the locking state of the adjusting member 26 inside the adjusting ball ring 24. Then, the position and direction of the adjusting member 26 can be manually adjusted without bending the injection tube 14 to achieve the purpose of adjusting the direction of the injection tube 14. After the direction of the injection tube 14 is determined, the second limiting member 23 is adjusted again to lock the adjusting member 26, thus completing the purpose of adjusting the direction of the injection tube 14. During the use of this device, the purpose of adjusting the injection tube 14 is to adjust the adjusting ball ring 24 and the adjusting member 26 inside the adjusting device 2, so as to facilitate the purpose of administering drugs into the cavity. By adjusting the second limiting member 23, the adjusting member 26 inside the anti-backflow member 25 can be locked to fix the adjusted direction. The anti-backflow member 25 inside the adjusting member 26 prevents the drug liquid inside the injection tube 14 from flowing back during drug administration, which would cause contamination of the injection connector 13 and the drug inlet tube 1.

[0022] like Figures 3 to 5 As shown, the first mounting ring 21 is symmetrically fitted with a following slip ring 211. The first limiting member 22 includes a first slip ring 221 slidably installed outside the first mounting ring 21. The first slip ring 221 is fixedly fitted with a symmetrically arranged first sliding post 222 on its side. The first sliding post 222 is fitted onto the following slip ring 211. A first limiting block 223 is fixedly installed at the end of the first sliding post 222. A first spring 225 is fixedly installed on the side of the first limiting block 223. The first spring 225 is concentric with the first sliding post 222. A pressing rod 224 is fixedly installed at the end of the first limiting block 223. The pressing rod 224 is inserted into the adjusting ball ring 24 and contacts the adjusting member 26 to limit the adjusting member 26.

[0023] It should be noted that, in order to facilitate locking the adjusting member 26 inside the anti-backflow component 25, a first slip ring 221 is provided outside the first mounting ring 21, and a following slip ring 211 is provided outside the first mounting ring 21. The first sliding post 222 slides inside the following slip ring 211, thus driving the first limiting block 223 and the squeezing rod 224 to move, thereby locking the adjusting member 26. When adjusting the direction of the injection needle tube 14, the squeezing rod 224 can be moved to release the locking of the adjusting member 26. When the direction of the injection needle tube 14 is determined, the squeezing rod 224 can contact the adjusting member 26, thereby facilitating the locking of the direction of the adjusting member 26.

[0024] like Figures 4 to 5 As shown, the second limiting member 23 is slidably installed on the first U-shaped limiting block 231 outside the first slip ring 221. A second limiting rod 232 is fixedly installed on the side of the first U-shaped limiting block 231. A first fixing plate 233 is fixedly installed on the outside of the adjusting ball ring 24. The second limiting rod 232 is slidably installed on the end of the first fixing plate 233. A second U-shaped limiting block 234 is fixedly installed on the end of the second limiting rod 232. A first rotating plate 235 is rotatably installed inside the second U-shaped limiting block 234.

[0025] It should be noted that when adjusting the movement of the first slip ring 221, the first U-shaped limiting block 231 can be slid by stretching the first rotating plate 235. The sliding of the first U-shaped limiting block 231 can drive the first slip ring 221 to slide, thereby achieving the purpose of locking and unlocking the adjusting member 26.

[0026] like Figures 3 to 5 As shown, the second limiting member 23 includes a second support block 236 fixedly installed outside the adjusting ball ring 24. A rotating semicircular block 237 is rotatably installed at the end of the second support block 236. A connecting plate 238 is fixedly installed on the rotating semicircular block 237. The connecting plate 238 is connected to the end of the first rotating plate 235. A first rotating handle 239 is fixedly installed on the side of the rotating semicircular block 237.

[0027] It should be noted that, in order to facilitate the sliding of the first slip ring 221, the first rotating handle 239 can be held to make the rotating semicircular block 237 rotate around the end of the second support block 236, thereby driving the connecting plate 238 to rotate. The first rotating plate 235 can drive the second limiting rod 232 and the first U-shaped limiting block 231 to move closer to or away from the drug inlet tube 1, thereby achieving the purpose of locking the anti-backflow component 25 and the adjusting component 26.

[0028] like Figures 5 to 7As shown, the adjusting member 26 includes a first adjusting ball 261 movably installed inside the adjusting ball ring 24. The first adjusting ball 261 has a through hole inside and a first adapting groove 263 and a second adapting groove 264 inside. The first adapting groove 263 and the second adapting groove 264 are connected to the anti-backflow member 25 to prevent the liquid inside the injection needle tube 14 from flowing back.

[0029] It should be noted that the anti-backflow component 25 is installed between the second adapting groove 264 and the first adapting groove 263. The anti-backflow component 25 adjusts the flow state inside the regulating component 26 to prevent the backflow of liquid in the through hole inside the first regulating ball 261.

[0030] like Figures 5 to 8 As shown, the anti-backflow component 25 includes an adjusting spring 253 fixedly installed inside the through hole of the first adjusting ball 261. A first one-way ball 251 is provided on one side of the first adaptation groove 263, and a second one-way ball 252 is provided on one side of the second adaptation groove 264. The adjusting spring 253 is used to lift the first one-way ball 251 and the second one-way ball 252. A second adjusting handle 255 is fixedly installed on the side of the adjusting spring 253. A third limiting post 254 is fixedly installed inside the first adjusting ball 261. A sealing protrusion 265 is provided inside the first adjusting ball 261. The second adjusting handle 255 is used to adjust the direction of the adjusting spring 253, and the sealing protrusion 265 is used to seal the through hole inside the first adjusting ball 261.

[0031] It should be noted that by holding the second adjusting handle 255, the direction of the adjusting spring 253 can be adjusted. The adjusting spring 253 is a metal spring. By adjusting the direction of the bending of the spring 253, the first one-way ball 251 and the second one-way ball 252 can be moved. When the adjusting spring 253 contacts the first one-way ball 251, so that the first one-way ball 251 contacts the first adaptation groove 263, the liquid inside the injection needle tube 14 can be prevented from flowing back into the drug inlet tube 1, thus preventing drug contamination. When the adjusting spring 253 contacts the second one-way ball 252, so that the second one-way ball 252 contacts the second adaptation groove 264, the liquid inside the drug inlet tube 1 can be prevented from flowing out of the injection needle tube 14, thus achieving the purpose and effect of sealing.

[0032] like Figures 5 to 6 As shown, an adjustment protrusion 262 is fixedly installed on the outside of the first adjustment ball 261 on the side away from the anti-backflow component 25. The adjustment protrusion 262 is used to limit the direction of the first adjustment ball 261.

[0033] It should be noted that when the first adjusting ball 261 is movably installed inside the adjusting ball ring 24, the adjusting protrusion 262 prevents the first adjusting ball 261 from sliding inside the adjusting ball ring 24 and causing tilting. The adjusting protrusion 262 is the range for the first adjusting ball 261 to adjust its direction inside the adjusting ball ring 24, thereby improving the stability of the directional adjustment of the first adjusting ball 261.

[0034] like Figures 4 to 8 As shown, the distance between the two pressing rods 224 is less than the outer diameter of the first adjusting ball 261, and the ends of the pressing rods 224 are used to contact the outside of the first adjusting ball 261.

[0035] It should be noted that the distance between the two squeezing rods 224 is less than the outer diameter of the first adjusting ball 261, so that the squeezing rods 224 can contact the outside of the adjusting member 26, thereby participating in the locking purpose. The end of the squeezing rod 224 is used to contact the outside of the first adjusting ball 261, so as to facilitate locking the direction of the adjusting member 26 and the injection needle tube 14.

[0036] like Figures 6 to 8 As shown, the first one-way ball 251 and the second one-way ball 252 have the same diameter. The diameter of the first one-way ball 251 is smaller than the diameter of the through hole inside the first adjusting ball 261. The diameters of the second adapting groove 264 and the first adapting groove 263 are smaller than the diameter of the first one-way ball 251.

[0037] It should be noted that the first one-way ball 251 and the second one-way ball 252 have the same diameter, so that the flow rate of the liquid inside the first regulating ball 261 is the same. The diameter of the first one-way ball 251 is smaller than the diameter of the through hole inside the first regulating ball 261. The diameters of the second adapting groove 264 and the first adapting groove 263 are smaller than the diameter of the first one-way ball 251, so that the movement of the first one-way ball 251 and the second one-way ball 252 can block the through hole inside the first regulating ball 261.

[0038] like Figures 4 to 8 As shown, rubber is provided at the connection opening between the adjusting ball ring 24 and the first adjusting ball 261.

[0039] It should be noted that rubber is provided at the connection opening between the adjusting ball ring 24 and the first adjusting ball 261 to reduce the friction between the adjusting ball ring 24 and the first adjusting ball 261 and prevent the problem of gaps between the adjusting ball ring 24 and the first adjusting ball 261.

[0040] The embodiments of the present invention have been described above, but the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms based on the guidance of the embodiments described above, all of which are within the protection scope of the present invention.

Claims

1. A device for local administration of an intraoral medical treatment, comprising a drug inlet tube (1), characterized in that: The medicine inlet pipe (1) is internally slidably installed with a rubber plunger column (12), the side of the rubber plunger column (12) is fixedly installed with an injection rod (11), the side of the medicine inlet pipe (1) away from the rubber plunger column (12) is fixedly installed with an injection connector (13), the outside of the injection connector (13) is threadedly installed with an adjusting device (2), the end of the adjusting device (2) away from the injection connector (13) is provided with an injection needle tube (14), the adjusting device (2) is used for adjusting the direction of the injection needle tube (14) to prevent backflow of the injection needle tube (14) during injection; The adjusting device (2) comprises a first mounting ring (21), a first limiting piece (22), a second limiting piece (23), an adjusting ball ring (24), an anti-backflow piece (25) and an adjusting piece (26), the outside of the injection connector (13) is threadedly installed with the first mounting ring (21), the outside of the first mounting ring (21) is slidably provided with the first limiting piece (22), the inside of the first mounting ring (21) is slidably installed with the adjusting ball ring (24), the inside of the adjusting ball ring (24) is movably installed with the adjusting piece (26), the first limiting piece (22) is used for limiting the adjusting piece (26), the outside of the adjusting ball ring (24) is fixedly installed with the second limiting piece (23), the second limiting piece (23) is used for limiting the first limiting piece (22), the inside of the adjusting piece (26) is provided with the anti-backflow piece (25), the anti-backflow piece (25) prevents backflow of liquid in the injection needle tube (14), and the adjusting piece (26) is used for adjusting the direction of the injection needle tube (14).

2. The device according to claim 1, wherein: The outside of the first mounting ring (21) is sleeved with symmetrically installed following sliding rings (211), the first limiting piece (22) comprises a first sliding ring (221) slidably installed on the outside of the first mounting ring (21), the side of the first sliding ring (221) is fixedly installed with symmetrically arranged first sliding columns (222), the outside of the first sliding column (222) is sleeved on the following sliding ring (211), the end of the first sliding column (222) is fixedly installed with a first limiting block (223), the side of the first limiting block (223) is fixedly installed with a first spring (225), the first spring (225) is concentric with the first sliding column (222), the end of the first limiting block (223) is fixedly installed with a pressing rod (224), the pressing rod (224) is inserted into the inside of the adjusting ball ring (24) and contacts the adjusting piece (26) to limit the adjusting piece (26).

3. The device of claim 2, wherein: The second limiting piece (23) is slidingly installed at the first U-shaped limiting block (231) outside the first sliding ring (221), the side of the first U-shaped limiting block (231) is fixedly installed with the second limiting rod (232), the outside of the adjusting ball ring (24) is fixedly installed with the first fixed plate (233), the second limiting rod (232) is slidingly installed at the end of the first fixed plate (233), the end of the second limiting rod (232) is fixedly installed with the second U-shaped limiting block (234), and the inside of the second U-shaped limiting block (234) is rotatably installed with the first rotating plate (235).

4. The device of claim 3, wherein: The second limiting piece (23) comprises the second supporting block (236) fixedly installed outside the adjusting ball ring (24), the end of the second supporting block (236) is rotatably installed with the rotating semicircular block (237), the rotating semicircular block (237) is fixedly installed with the connecting plate (238), the connecting plate (238) is connected with the end of the first rotating plate (235), and the side of the rotating semicircular block (237) is fixedly installed with the first rotating handle (239).

5. The device of claim 4, wherein: The adjusting piece (26) comprises the first adjusting ball (261) movably installed inside the adjusting ball ring (24), the inside of the first adjusting ball (261) is provided with a through hole, the inside of the first adjusting ball (261) is provided with the first adaptive groove (263) and the second adaptive groove (264), the first adaptive groove (263) and the second adaptive groove (264) are connected with the anti-backflow piece (25), and the liquid in the injection needle tube (14) is prevented from backflowing.

6. The device of claim 5, wherein: The anti-backflow piece (25) comprises the adjusting elastic sheet (253) fixedly installed inside the through hole of the first adjusting ball (261), one side of the first adaptive groove (263) is provided with the first one-way ball (251), one side of the second adaptive groove (264) is provided with the second one-way ball (252), the adjusting elastic sheet (253) is used for lifting the first one-way ball (251) and the second one-way ball (252), the side of the adjusting elastic sheet (253) is fixedly installed with the second adjusting handle (255), the inside of the first adjusting ball (261) is fixedly installed with the third limiting column (254), the inside of the first adjusting ball (261) is provided with the sealing protrusion (265), the second adjusting handle (255) is used for adjusting the direction of the adjusting elastic sheet (253), and the sealing protrusion (265) is used for sealing the through hole in the first adjusting ball (261).

7. A device for the topical administration of an intraoral treatment according to claim 6, characterized in that: The outside of the first adjusting ball (261) on the side away from the anti-backflow piece (25) is fixedly installed with the adjusting protrusion (262), and the adjusting protrusion (262) is used for limiting the direction of the first adjusting ball (261).

8. A device for the topical administration of an intraoral medical treatment according to claim 7, characterized in that: The distance between the two extrusion rods (224) is less than the outer diameter of the first adjusting ball (261), and the end of the extrusion rod (224) is used for contacting the outside of the first adjusting ball (261).

9. A device for the topical administration of an intra-oral treatment according to claim 8, characterised in that: The first one-way ball (251) has the same diameter as the second one-way ball (252), the diameter of the first one-way ball (251) is smaller than the diameter of the internal through hole of the first adjusting ball (261), and the diameters of the second adaptive groove (264) and the first adaptive groove (263) are smaller than the diameter of the first one-way ball (251).

10. The device of claim 9, wherein: The adjusting ball ring (24) and the first adjusting ball (261) are connected at the opening and are provided with rubber.

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