An intraoral device for administering a medicament

Abstract

This invention relates to the field of medical device technology, and more particularly to an intraoral drug delivery device for dentistry, comprising: a handle portion including a handle sleeve; a bending portion including a medical tube connected to the handle sleeve via a cap, the distal end of the medical tube having a nozzle with a light-transmitting groove; and a retracting portion including a block embedded in the handle sleeve, a ratchet rotatably mounted on the block, a hook unidirectionally engaged with the ratchet, and a medical cord. The nozzle direction of this invention is actively adjustable. Through the cooperation of the ratchet, hook, medical cord, retaining ring, and rubber ring in the retracting portion, the operator can use one hand to move the ratchet to retract the medical cord. The medical cord pulls one side of the medical tube through the rubber ring, causing the medical tube to bend controllably, thereby precisely pointing the nozzle at hidden affected areas such as the lingual side of the molars and the pharyngeal wall, which are inaccessible by conventional straight-tube instruments. The unidirectional locking function of the hook and the supporting spring allows the medical tube to be maintained at any bending angle.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to an intraoral drug delivery device for dental use. Background Technology

[0002] Treatment of oral mucosal and periodontal diseases is an important part of clinical work in dentistry. Local administration is the preferred method of administration because it can achieve high drug concentrations at the lesion site and reduce systemic adverse reactions. However, the special anatomy of the oral cavity and the complex intracavitary environment bring many challenges to precise local administration.

[0003] There are many areas inside the oral cavity that are difficult to reach with a direct line of sight, including the lingual surface of molars, the palatal gingiva, the pharyngeal wall, the tonsillar crypts, and interdental spaces. Clinically used straight syringes or ordinary sprayers have a single drug delivery route, and when they encounter soft tissues such as the tongue or buccal mucosa, it is difficult to accurately deliver the nozzle to these hidden areas. Often, the operator can only rely on experience to spray blindly, and the drug is often blocked by the tongue or washed away by saliva, resulting in a significant reduction in the effective adhesion rate.

[0004] The confined space of the oral cavity makes it difficult for external light to enter. When applying medication to hidden lesions such as oral ulcers and mucosal damage, operators often struggle to clearly identify the wound location, hindering precise medication application. Some products incorporate lighting components on the spray nozzle; however, these are typically separate structures, with the light fixed externally or to the side of the spray tube. This design has two inherent drawbacks: first, the fixed light and spray nozzle create a blind spot, preventing synchronized directional illumination as the nozzle direction is adjusted; second, side lighting can easily produce lateral shadows or direct glare on the affected area, making it difficult for the operator to accurately determine the center point of the spray. Therefore, a dental intraoral medication delivery device is needed to address these issues. Summary of the Invention

[0005] The purpose of this invention is to solve the problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: An intraoral drug delivery device for dental use, comprising: The instrument handle portion, which includes the handle sleeve; The curved portion includes a medical tubing connected to the handle sleeve via a snap cap, the distal end of which is provided with a nozzle, and the nozzle is provided with a light-transmitting groove; The retractable part includes a plug embedded in the handle sleeve, a ratchet rotatably mounted on the plug, a hook that engages unidirectionally with the ratchet, and a medical rope. The middle portion of the medical rope is wound around the ratchet, and the distal end of the medical rope is connected via a retainer to a rubber ring fitted around the outer circumference of the medical tubing. This ring is used to bend the medical tubing by retracting the medical rope through the ratchet, thereby changing the spray direction. The lighting component includes an annular light strip installed within the handle sleeve and multiple light guide fibers. The light guide fibers pass through the cover and extend along the medical tubing to the nozzle. The light-transmitting groove is used to transmit light from the light guide fibers.

[0007] Preferably, the instrument handle portion further includes: a threaded connector connected to the right side of the handle sleeve, a sealing piston inserted inside the threaded connector, a push rod connected to the right side of the sealing piston, and a push plate connected to the right side of the push rod.

[0008] Preferably, the instrument handle portion further includes: a ring cover threaded onto the surface of the threaded connector, and force-bearing rings symmetrically connected to both sides of the ring cover, wherein the left side of the ring cover can abut against the right side of the insert block for limiting.

[0009] Preferably, in the retractable part: the upper and lower ends of the insert block are provided with strip plate ends; the handle sleeve is provided with a slot, and the strip plate ends are embedded in the inner wall of the slot through a guide groove; A support spring is connected to the inner side of the ratchet, and the other end of the support spring is connected and fixed to the insert block.

[0010] Preferably, the bending portion further includes: a plurality of limiting rings disposed on the surface of the medical tube, wherein an annular groove for limiting the rubber ring is formed between two adjacent limiting rings.

[0011] Preferably, the curved portion further includes: a sealing ring fitted onto the annular groove on the right side surface of the nozzle, wherein the sealing ring has semi-circular protrusions on its left and right sides, and the semi-circular protrusions are embedded in the inner wall of the annular groove of the nozzle.

[0012] Preferably, in the lighting section: the annular light strip is installed inside the handle sleeve through a cavity, and multiple light guide fibers are arranged around the left side of the annular light strip along the axial direction of the handle sleeve. The light guide fibers are inserted into the medical tubing after passing through the handle sleeve and the buckle cap through through holes.

[0013] Preferably, in the bent portion: the medical tubing consists of an inner tube and an outer tube, with a cavity provided between the inner tube and the outer tube, and the light-transmitting groove is adapted to the cavity.

[0014] Preferably, the bending portion further includes: guide discs symmetrically arranged on both sides of the cover, and a constraint protrusion ring disposed on the surface of the medical tube, wherein the surface of the constraint protrusion ring is provided with a groove for limiting and constraining the medical rope.

[0015] This invention has at least the following beneficial effects: The nozzle direction of this invention is actively adjustable. Through the cooperation of the ratchet, hook, medical rope, retaining ring, and rubber ring in the retraction part, the operator can turn the ratchet with one hand to retract the medical rope. The medical rope pulls one side of the medical tubing through the rubber ring, causing the medical tubing to bend in a controllable manner. This allows the nozzle to be precisely aimed at hidden lesions such as the lingual side of the molars and the pharyngeal wall, which are inaccessible by conventional straight-tube instruments. The one-way locking function of the hook and the support spring allows the medical tubing to be kept at any bending angle without continuous force, overcoming the shortcomings of traditional instruments that cannot reach the affected areas.

[0016] This invention features synchronized illumination and pointing. The light emitted from the annular light strip in the illumination area is conducted along the medical tubing via optical fibers to the nozzle tip and then emitted through the light-transmitting groove. Since the optical fibers are arranged longitudinally along the medical tubing and the light-transmitting groove is located at the nozzle tip, the direction of light emission is always consistent with the nozzle's pointing direction. Doctors can determine whether the nozzle is aligned with the affected area by observing the position of the annular light spot on the mucosa, avoiding lateral shadows and direct glare caused by side illumination, and achieving precise positioning where what you see is what you spray.

[0017] In this invention, both the pull-out part and the lighting part are installed on the instrument handle and the bending part. Bending adjustment, lighting, and drug delivery are all concentrated in one-handed operation, without the need for additional tools or external light sources. The optical fiber not only transmits light but also acts as an elastic reinforcing rib of the medical tube, assisting in the repositioning of the medical tube. This further simplifies the structure, enabling the device to adapt to different clinical scenarios such as repeated drug delivery, multi-directional spraying, and deep drug delivery, and has good versatility and practicality. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the external structure of an intraoral drug delivery device for dental use proposed in this invention; Figure 2 This is a schematic diagram of the external disassembly and assembly structure of an intraoral drug delivery device for dental use proposed in this invention; Figure 3This is a three-dimensional disassembly and assembly diagram of the instrument handle and the retractable part in an intraoral drug delivery device for dentistry proposed in this invention. Figure 4 This is a side view of the retractable portion of an intraoral drug delivery device for dental use proposed in this invention. Figure 5 This is a three-dimensional structural diagram of the retractable part in an intraoral drug delivery device for dental use proposed in this invention; Figure 6 This is a schematic diagram of the disassembly and assembly structure of the pull-out part and the bending part in an intraoral drug delivery device for dental use proposed in this invention. Figure 7 This is a cross-sectional schematic diagram of the curved portion of an intraoral drug delivery device for dental use proposed in this invention. Figure 8 This is a three-dimensional disassembly diagram of the curved part in an intraoral drug delivery device for dental use proposed in this invention.

[0020] In the picture: 1. Handle of the instrument; 11. Handle sleeve; 12. Threaded connector; 13. Sealing piston; 14. Push rod; 15. Push plate; 16. Ring cap; 17. Force ring; 2. Retractable part; 21. Insert block; 22. Ratchet; 23. Ratchet hook; 24. Support spring; 25. Medical rope; 26. Snap ring; 27. Rubber ring; 3. Bending section; 31. Cap; 32. Guide plate; 33. Medical tubing; 34. Restraining ring; 35. Limiting ring; 36. Nozzle; 37. Light-transmitting groove; 38. Sealing ring; 4. Lighting components; 41. Circular light strip; 42. Light guide fiber. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0022] The overall structural features of the device are as follows; Reference Figure 1-8 An intraoral drug delivery device for dental use, comprising: The instrument handle part 1 includes a handle sleeve 11, a threaded connector 12 connected to the right side of the handle sleeve 11, and a sealing piston 13 that is sealed and fitted is inserted inside the threaded connector 12 through a liquid elongated cavity. A push rod 14 is connected to the right side of the sealing piston 13, and a push plate 15 is connected to the right side of the push rod 14. The retractable part 2 includes two insert blocks 21, which are embedded in the surface of the handle sleeve 11 through slots. A ratchet 22 is rotatably mounted on the surface of the insert block 21, and the surface of the ratchet 22 is decorated with one-way teeth. A ratchet hook 23 is movably mounted on the surface of the insert block 21, and the ratchet hook 23 engages with the one-way teeth of the ratchet 22. A support spring 24 is connected to the inner side of the ratchet hook 23, and the other end of the support spring 24 is connected and fixed to the insert block 21. A winding groove is formed on the surface of the ratchet 22, and a medical rope 25 is wound in the winding groove. The other end of the medical rope 25 is... The medical hose 23 is connected and fixed to the retaining ring 26, which is fixed to the surface of the rubber ring 27. When the ratchet 22 rotates, it pulls the medical rope 25, causing one side of the medical hose 33 to bend under force, thereby changing the final spraying direction. When the ratchet 22 unwinds and reverses, the medical rope 25 loosens, and the optical fiber 42 inside the medical hose 33 can act as a reinforcing rib to assist the medical hose 33 in resetting. Alternatively, the medical hose 33 can be pulled by rotating the ratchet 22 on the other side through another medical rope 25, thereby achieving resetting and adjustment. The bent part 3 includes a snap cover 31 that is threadedly connected to the left side of the handle sleeve 11. A medical hose 33 is connected to the left side of the snap cover 31. A nozzle 36 for spraying medicine is inserted into the left side of the medical hose 33. A rubber ring 27 is fitted on the surface of the medical hose 33. The threaded connector 12 is threaded with a ring cover 16, and two force rings 17 for finger hooks are symmetrically connected on both sides of the ring cover 16. The left side of the ring cover 16 can abut against the right side of the insert block 21 for limiting.

[0023] The upper and lower ends of the insert 21 are provided with strip ends, and the strip ends are embedded in the inner wall of the slot of the handle sleeve 11 through guide grooves.

[0024] The surface of the medical tubing 33 is provided with several limiting rings 35. An annular groove is formed between two adjacent limiting rings 35 to limit the rubber ring 27. This groove can be used to adjust the position of the rubber ring 27 and facilitate changing the bending position of the medical tubing 33.

[0025] A sealing ring 38 is fitted on the right side surface of the nozzle 36 through an annular groove. Semi-circular protrusions are provided on the left and right sides of the sealing ring 38, and the semi-circular protrusions are embedded in the inner wall of the annular groove of the nozzle 36 through a slot.

[0026] The handle sleeve 11 is also provided with an illumination part 4. The illumination part 4 includes an annular light strip 41 installed inside the handle sleeve 11 through a cavity. Several light guide fibers 42 are arranged around the left side of the annular light strip 41. The light guide fibers 42 are inserted into the medical tubing 33 after passing through the handle sleeve 11 and the buckle 31 through the through hole. The annular light strip 41 can be powered by an external power source or by a button battery. The light guide fibers 42 are medical-grade plastic optical fibers, such as PMMA optical fibers.

[0027] The medical tubing 33 consists of an inner tube and an outer tube, with a cavity between the inner and outer tubes.

[0028] The cover 31 has guide discs 32 symmetrically arranged on both sides to reduce friction. The surface of the medical tube 33 is also provided with a constraint protrusion 34, and the surface of the constraint protrusion 34 is provided with a medical rope 25 for limiting and constraining the medical rope 25.

[0029] The surface of the nozzle 36 is provided with several light-transmitting grooves 37, and the light-transmitting grooves 37 are adapted to the interlayer cavity between the inner tube and the outer tube in the medical tube 33, so as to facilitate the transmission of light from the optical fiber 42.

[0030] The following examples illustrate this solution for your understanding; Example

[0031] Scenario Setting: This embodiment is applicable to dentists administering local medication to ulcers on the lingual side of a patient's molars. This area is in a blind spot of natural vision, and the tongue moves frequently, making it difficult to accurately aim using a conventional straight-tube syringe.

[0032] Structural Connections and Fittings: The handle sleeve 11 of the instrument handle part 1 serves as the main handheld component. Its right side is connected to the drug delivery drive unit via a threaded connector 12. The threaded connector 12 contains a long, narrow liquid cavity into which a sealing piston 13 is inserted and kept in a sealed fit. A push rod 14 and a push plate 15 are sequentially connected to the right side of the sealing piston 13. The push plate 15 is pressed by the doctor's thumb, and the push rod 14 transmits the thrust to the sealing piston 13, propelling the medication forward.

[0033] The bent portion 3 is threadedly connected to the left side of the handle sleeve 11 via a snap cap 31. A medical tubing 33 is fixedly connected to the left side of the snap cap 31, and a nozzle 36 is inserted into the distal end of the medical tubing 33, i.e., the end furthest from the operator. The medical tubing 33 is a medical polymer tube with a certain degree of flexibility, and its outer surface is fitted with a rubber ring 27, which can slide along the axial direction of the medical tubing 33.

[0034] The retractable part 2 includes two inserts 21, symmetrically embedded in slots on the surface of the handle sleeve 11. Each insert 21 has a ratchet 22 rotatably mounted on it. The surface of the ratchet 22 has one-way teeth. A hook 23 is also movably mounted on the insert 21. The hook 23 engages with the one-way teeth of the ratchet 22. The inner side of the hook 23 is supported by a support spring 24, ensuring that the hook 23 always maintains a tendency to engage with the ratchet 22. A winding groove is formed on the surface of the ratchet 22. The middle part of the medical rope 25 is wound in the winding groove, and the distal end of the medical rope 25 is fixedly connected to the rubber ring 27 through a retaining ring 26. The medical ropes 25 on the two inserts 21 are respectively connected to the left and right sides or the top and bottom sides of the rubber ring 27, forming a pull-out structure.

[0035] The annular light strip 41 of the lighting unit 4 is fixedly installed inside the handle sleeve 11 through a cavity. The power supply for the annular light strip 41 can be provided by an external power cord or a built-in button battery. Several optical fibers 42, which are medical-grade PMMA plastic optical fibers, are connected around the left side of the annular light strip 41. The optical fibers 42 pass through the through holes on the left side wall of the handle sleeve 11, then through the corresponding through holes on the cover 31, and then extend along the interlayer cavity of the medical tubing 33 to the nozzle 36. Multiple light-transmitting grooves 37 are formed around the surface of the nozzle 36. The light-transmitting grooves 37 correspond to the end positions of the optical fibers 42, allowing light to be emitted outward from the front end of the nozzle 36.

[0036] Work process: Step 1, initial preparation: The doctor draws the liquid into the liquid elongated cavity of the threaded connector 12, aligns the nozzle 36 with the direction of the patient's mouth, turns on the power of the ring light strip 41, and the end of the optical fiber 42 emits a ring light spot.

[0037] The second step is insertion and bending adjustment: The doctor holds the handle sleeve 11 and inserts the medical tube 33 along with the nozzle 36 into the patient's mouth. When it is necessary to point the nozzle towards the lingual side of the molars, the doctor uses another finger of the same hand, such as the index finger, to turn the ratchet 22 corresponding to that side, causing the ratchet 22 to rotate clockwise. The ratchet 22 winds up the medical cord 25, and the medical cord 25 pulls the rubber ring 27 closer to the ratchet 22 through the retainer 26. Since the rubber ring 27 is fitted outside the medical tube 33, the offset of the rubber ring 27 will cause one side of the medical tube 33 to be stretched, thus causing bending. The hook 23, under the action of the support spring 24, engages with the groove of the ratchet 22, preventing the ratchet 22 from rotating in the opposite direction. Therefore, the medical tube 33 can maintain its bent state. The doctor can continue to turn the ratchet 22 to increase the bending angle, or turn the ratchet 22 on the opposite side to loosen the medical cord 25 on this side to decrease the bending angle, thus achieving precise adjustment.

[0038] The third step is illumination alignment: While the beam is being adjusted, the annular light spot emitted from the front end of the light guide fiber 42 from the nozzle 36 always aligns with the direction of the nozzle 36. By observing the position of the light spot on the patient's mucosa, the doctor can determine whether the nozzle 36 is aligned with the ulcer surface. When the center of the light spot is directly aligned with the ulcer, it indicates that the nozzle 36 has been precisely positioned.

[0039] The fourth step is medication administration: The doctor presses the push plate 15 with his thumb, and the push rod 14 pushes the sealing piston 13 forward along the inner cavity of the threaded pipe 12, pushing the liquid medicine through the inner cavity of the cap 31 and the medical tube 33 to the nozzle 36. The liquid medicine is sprayed out from the nozzle 36 and covers the ulcer surface indicated by the light spot.

[0040] Step 5, Reset and Withdrawal: After the medication is administered, the doctor uses his hand to push the hook 23 outward, so that the ratchet 22 is released from one-way locking. At the same time, he pulls the medicine tubing 33 to straighten it naturally, and then withdraws the entire device from the patient's mouth.

[0041] Additional details: To ensure that the medical rope 25 does not come off during bending, the surface of the medical tubing 33 is provided with a restraining protrusion 34. The surface of the restraining protrusion 34 is provided with a groove. The medical rope 25 passes through the groove and is limited. The upper and lower ends of the insertion block 21 are provided with strip ends. The strip ends are embedded in the inner wall of the slot of the handle sleeve 11 through the guide groove, so that the insertion block 21 will not come off when force is applied. The right side surface of the nozzle 36 is provided with a sealing ring 38 through the annular groove. The sealing ring 38 has semi-circular protrusions on the left and right sides, which are embedded in the inner wall of the annular groove of the nozzle 36 to prevent the medicine from leaking from the connection. Example

[0042] Scenario Setting: This embodiment is applicable to situations where repeated administration to the same affected area on the same patient is required multiple times, such as the periodic treatment of oral lichen planus. The physician desires that the bending position and angle of the medication tubing 33 remain consistent each time medication is administered to improve operational efficiency and repeatability.

[0043] Structural Connection and Fit: Based on Embodiment 1, this embodiment adds several limiting rings 35 to the surface of the medical tubing 33. Each limiting ring 35 is an annular protrusion surrounding the medical tubing 33, with an annular groove formed between adjacent limiting rings 35. The inner diameter of the rubber ring 27 matches the outer diameter of the annular groove, allowing the rubber ring 27 to be inserted into any annular groove and axially limited by the limiting rings 35.

[0044] Working Process: During the initial administration, the doctor first determines the optimal bending position. Specifically, the rubber ring 27 is slid along the medicine tubing 33 to a certain position, and then the ratchet 22 is turned to observe the bending direction of the nozzle 36. Once the position where the nozzle 36 is precisely aligned with the affected area is found, the rubber ring 27 is pushed into the groove between the two limiting rings 35 corresponding to that position. The limiting rings 35 on both sides of the groove prevent the rubber ring 27 from sliding axially, thus locking its position. For each subsequent administration, the rubber ring 27 is stressed at the same position, maintaining a consistent bending shape in the medicine tubing 33. The doctor does not need to repeatedly adjust; simply turn the ratchet 22 until it can no longer rewind, indicating that the rubber ring 27 has reached its limit. This ensures the same bending angle is achieved.

[0045] The limiting ring 35 and the medical tubing 33 can be integrally injection molded. Its outer diameter is slightly larger than that of the medical tubing 33, and the axial width of the ring groove is greater than the axial thickness of the rubber ring 27, ensuring that the rubber ring 27 can be smoothly inserted with a small amount of play. Example

[0046] Scenario setting: This embodiment is suitable for scenarios that require frequent changes in bending direction or multi-directional spraying in confined spaces, such as simultaneously treating two ulcer surfaces on the palatal and buccal sides.

[0047] Structural Connections and Fittings: In this embodiment, the retractable part 2 is equipped with two independent ratchet wheels 22, hooks 23, and medical ropes 25, located on the left and right sides or top and bottom sides of the handle sleeve 11, respectively. The distal ends of the two medical ropes 25 are connected to the symmetrical sides of the rubber ring 27 via their respective retaining rings 26. The optical fiber 42 inside the medical tubing 33 acts as a reinforcing rib with a certain degree of bending rigidity, assisting the medical tubing 33 in returning to a straight state when no force is applied.

[0048] Working process: When the doctor needs to bend the nozzle 36 to the left, he moves the ratchet 22 on the left, the medical rope 25 on the left is wound up, the rubber ring 27 is pulled to the left, the medical tube 33 bends to the left, and the medical rope 25 on the right is in a slack state.

[0049] When the nozzle 36 needs to be bent to the right, the doctor first disengages the left-side ratchet 23 to release the lock of the left-side ratchet 22, and then moves the right-side ratchet 22 to rewind the right-side medical rope 25. The right-side medical rope 25 pulls the rubber ring 27 to the right, while the left-side medical rope 25 is pulled out and unwound. Because the optical fiber 42 is arranged longitudinally along the medical tubing 33, it has a certain elastic restoring force, which can help the medical tubing 33 smoothly transition when the pulling force on both sides alternates, avoiding sudden bouncing.

[0050] When full repositioning and straightening are required, the doctor simultaneously removes the two hooks 23 on both sides, releasing both medical ropes 25. The medical tubing 33 naturally straightens under its own elasticity and the repositioning effect of the optical fiber 42.

[0051] In this embodiment, guide discs 32 are symmetrically provided on both sides of the cover 31. The guide discs 32 have smooth surfaces and are used to guide the movement direction of the medical rope 25 and reduce friction. The groove on the constraint protrusion 34 further limits the path of the medical rope 25 and prevents the two medical ropes 25 from getting tangled together. Example

[0052] Scenario setting: This embodiment is applicable when a large pushing force is required to administer medication or when the doctor's hand strength is relatively small, such as administering medication deep into a child's mouth, where a stable pushing force is required.

[0053] Structural Connection and Fitting Relationship: Based on Embodiments 1, 2, or 3, a ring cover 16 is threaded onto the surface of the threaded connector 12 of the instrument handle portion 1, and force-bearing rings 17 are symmetrically connected to both sides of the ring cover 16. The force-bearing rings 17 are annular structures that can be hooked by fingers. The left side of the ring cover 16 can abut against the right side of the insertion block 21, playing an axial limiting role and preventing the insertion block 21 from sliding backward during operation.

[0054] Working process: When administering medication, the doctor hooks their index and middle fingers into the two force-receiving rings 17 respectively, and presses the push plate 15 with their thumb. The force-receiving rings 17 provide a point of leverage for the fingers, ensuring that the main body of the device does not shift backward when the thumb presses the push plate 15, thus converting all the thumb's pushing force into the propulsive force of the sealed piston 13. Compared to directly holding the handle sleeve 11 and pressing, this embodiment greatly improves the stability and propulsive force transmission efficiency during medication administration, making it especially suitable for scenarios requiring slow and continuous drug delivery.

[0055] The ring cover 16 also serves to block the insertion block 21: when the doctor turns the ratchet 22 with greater force, the insertion block 21 tends to move backward. The left side of the ring cover 16 abuts against the right side of the insertion block 21 to prevent the insertion block 21 from coming out of the slot.

[0056] The threaded connection between the ring cover 16 and the threaded connector 12 allows for adjustment of the axial position of the ring cover 16, thereby fine-tuning the gap between it and the insert 21 to accommodate inserts 21 of different sizes or to compensate for wear.

[0057] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. An intraoral drug delivery device for dental use, characterized in that, include: The instrument handle portion (1) includes a handle sleeve (11). The curved part (3) includes a medical tube (33) connected to the handle sleeve (11) by a buckle (31), and the distal end of the medical tube (33) is provided with a nozzle (36), and the nozzle (36) is provided with a light-transmitting groove (37). The retractable part (2) includes a plug (21) embedded in the handle sleeve (11), a ratchet (22) rotatably mounted on the plug (21), a hook (23) unidirectionally engaged with the ratchet (22), and a medical rope (25). The middle part of the medical rope (25) is wound around the ratchet (22), and the distal end of the medical rope (25) is connected to a rubber ring (27) sleeved on the outer periphery of the medical hose (33) via a retainer (26). This ring is used to bend the medical hose (33) by retracting the medical rope (25) through the ratchet (22) to change the spraying direction. The lighting part (4) includes an annular light strip (41) installed in the handle sleeve (11) and multiple light guide fibers (42), the light guide fibers (42) passing through the cover (31) and extending along the medical tubing (33) to the nozzle (36), and the light transmission groove (37) for transmitting the light from the light guide fibers (42).

2. The intraoral applicator of claim 1, wherein The instrument handle portion (1) further includes: a threaded connector (12) connected to the right side of the handle sleeve (11), a sealing piston (13) inserted inside the threaded connector (12), a push rod (14) connected to the right side of the sealing piston (13), and a push plate (15) connected to the right side of the push rod (14).

3. An intraoral applicator for dental use according to claim 2, characterized in that The instrument handle part (1) further includes: a ring cover (16) threaded onto the surface of the threaded connector (12), and force rings (17) symmetrically connected to both sides of the ring cover (16), wherein the left side of the ring cover (16) can abut against the right side of the insert (21) for limiting.

4. The intraoral applicator of claim 1, wherein the applicator tip is a brush. In the pull-out part (2): the upper and lower ends of the insert (21) are provided with strip plate ends; the handle sleeve (11) is provided with a slot, and the strip plate ends are embedded in the inner wall of the slot through the guide groove; The inner side of the ratchet (23) is connected to a support spring (24), and the other end of the support spring (24) is connected and fixed to the insert (21).

5. The oral medication delivery device for dental use according to claim 1, characterized in that, The bending portion (3) further includes: a plurality of limiting rings (35) disposed on the surface of the medical tube (33), and an annular groove for limiting the rubber ring (27) is formed between two adjacent limiting rings (35).

6. An intraoral applicator for dental use according to claim 5, characterized in that The curved part (3) further includes: a sealing ring (38) fitted onto the annular groove on the right side surface of the nozzle (36), the sealing ring (38) having semi-circular protrusions on both sides, the semi-circular protrusions being embedded in the inner wall of the annular groove of the nozzle (36).

7. The intraoral applicator of claim 1, wherein In the lighting part (4): the annular light strip (41) is installed inside the handle sleeve (11) through a cavity, and multiple light guide fibers (42) are arranged around the left side of the annular light strip (41) along the axial direction of the handle sleeve (11). The light guide fibers (42) are inserted into the medical tubing (33) after passing through the handle sleeve (11) and the buckle (31) through the through hole.

8. The intraoral applicator of claim 1, wherein, In the bent portion (3): the medical tube (33) is composed of an inner tube and an outer tube, and a cavity is provided between the inner tube and the outer tube. The light-transmitting groove (37) is adapted to the cavity.

9. The intraoral applicator of claim 1, wherein, The bending part (3) further includes: guide discs (32) symmetrically arranged on both sides of the cover (31), and a constraint protrusion (34) arranged on the surface of the medical tube (33), wherein the surface of the constraint protrusion (34) is provided with a groove for limiting and constraining the medical rope (25).

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