Laryngoscope auxiliary device for accurately smearing vocal cords of rats

Abstract

The invention discloses a laryngoscope auxiliary device for accurate smearing of vocal cords of rats, and relates to the technical field of biology, the laryngoscope auxiliary device comprises a base, a universal head, a laryngoscope body, a probe, an LED lamp mounting seat, an LED lamp, a smearing head mounting rod, a smearing head, a communicating pipe, a head fixing assembly, a tooth fixing assembly, a medicine feeding assembly, an adjusting assembly and the like; according to the device, a circle of LED lamps are arranged at the joint of the laryngoscope probe and the body, 360-degree uniform illumination can be conducted on the throat of a rat, vocal cord area details can be clearly presented in real time in cooperation with a high-definition camera probe and external display equipment, the problem of positioning deviation caused by insufficient light or view limitation in traditional operation is solved, and the working efficiency is improved. And reliable visual support is provided for accurate smearing.

Description

Technical Field

[0001] This invention relates to the field of biotechnology, and in particular to a laryngoscope-assisted device for precise application of ointment to the vocal cords of rats. Background Technology

[0002] In biotechnology and medical research, rats are frequently used as experimental models for laryngology and vocal cord diseases. Their vocal cord structure shares certain similarities with humans, making them an important vehicle for studying vocal cord damage repair, inflammatory responses, and the effects of drug intervention. Precise application of drugs or reagents to the rat's vocal cords is a crucial step in conducting these experiments, directly impacting the accuracy and reliability of the results.

[0003] However, there are still many technical challenges in the current experimental application of the ointment to the vocal cords of rats: Limited operating space and field of vision: The oral cavity and larynx of rats are small, and traditional laryngoscopes or simple tools cannot provide a clear and stable field of vision. Operators need to rely on experience to judge the position of the vocal cords, which can easily lead to the drug being applied off the target area and affect the accuracy of the experiment.

[0004] Animals are not securely fixed: rats are prone to head shaking or struggling during the operation. Existing fixation devices are mostly simple restraint structures that cannot accurately fix the head, ears and teeth. This not only increases the difficulty of the operation, but may also cause damage to the throat tissue due to the animal's movement.

[0005] Insufficient precision in drug delivery: Conventional application tools (such as cotton swabs and syringes) are difficult to control the dosage and application area of ​​drugs, which can easily lead to drug overdose, spillage or local omission. At the same time, hard tools may scratch the vocal cord mucosa and introduce additional experimental interference.

[0006] Poor coordination in multi-step operations: Visual observation, drug delivery and animal fixation often require multiple people to work together, the operation process is cumbersome, inefficient and it is difficult to ensure the synchronization and accuracy of each step.

[0007] While existing technologies include laryngoscopes and drug delivery devices designed for large animals or humans, these devices cannot be directly adapted to rats due to their unique body size. Furthermore, auxiliary tools specifically designed for rodents often have simple structures and lack integrated illumination, precise adjustment, and stable fixation functions, making it difficult to meet the demands of high-precision experiments. Therefore, developing an integrated auxiliary device capable of stable rat head fixation, clear visualization of the larynx, and precise drug delivery is crucial to overcoming current experimental bottlenecks and is of great significance for improving the scientific rigor and reproducibility of vocal cord-related experiments. Summary of the Invention

[0008] The purpose of this invention is to solve the above-mentioned problems by providing a laryngoscope-assisted device for precise application of ointment to the vocal cords of rats.

[0009] To address the aforementioned problems, this invention provides a technical solution: a laryngoscope auxiliary device for precise application of ointment to the vocal cords of rats, comprising a base, a universal joint, a laryngoscope body, a probe, an LED light mounting base, an LED light, an ointment head mounting rod, an ointment head, a connecting tube, a head fixation component, a tooth fixation component, a drug delivery component, and an adjustment component; the adjustment component is located on the upper left side of the base, and the head fixation component is located on the upper right side of the base; the tooth fixation component is located at the upper end of the head fixation component; the drug delivery component is located on the left side of the adjustment component; the universal joint is located on the right side of the adjustment component; the laryngoscope body is connected to the right side of the universal joint; the probe is located at the right end of the laryngoscope body, and an LED light mounting base is fixedly connected to the connection between the probe and the laryngoscope body, with a ring of LED lights on the LED light mounting base; the ointment head mounting rod is fixedly connected to the lower end of the laryngoscope body, and an ointment head is fixedly connected to the upper right end of the ointment head mounting rod, the ointment head being connected to the drug delivery component via the connecting tube.

[0010] Preferably, the head fixing assembly includes a head clamp, a slot, a mounting base, a first mounting block, a third locking rod, a second mounting block, a screw, an ear pressing block, and a handwheel; the mounting base is fixedly connected to the right side of the upper surface of the base; the head clamp is slidably connected to the mounting base; the head clamp has slots at both the front and rear ends; the second mounting blocks are fixedly connected to both the front and rear ends of the mounting base; each of the second mounting blocks has a screw threadedly connected to it, and the screw is located in the slot; an ear pressing block is fixedly connected to the inner end face of the screw, and a handwheel is fixedly connected to the outer end face of the screw; the first mounting blocks are fixedly connected to both the front and rear ends of the right side of the lower surface of the base, and each of the first mounting blocks has a third locking rod for locking the head clamp.

[0011] Preferably, the dental fixation assembly includes a second mounting block, a fourth locking rod, an arc rod, a dental ring, and a limiting block; the second mounting block is fixedly connected to the top of the head clamp; the arc rod is slidably connected to the second mounting block; the dental ring is fixedly connected to the left side of the arc rod, and the limiting block is fixedly connected to the right side of the arc rod; the top of the second mounting block is provided with a fourth locking rod for locking the arc rod.

[0012] Preferably, the drug delivery assembly includes a drug storage chamber, a drug inlet valve, a piston, a push rod, and a handle; the drug storage chamber is fixedly connected to the left side of the upper surface of the crossbar; the drug outlet end of the drug storage chamber is connected to a connecting pipe; the drug inlet valve is fixedly connected to the upper right side of the drug storage chamber; a piston is slidably connected in the drug storage chamber; a push rod is fixedly connected to the right end of the piston; and a handle is fixedly connected to the right end of the push rod.

[0013] Preferably, the adjustment assembly includes a first bushing, a first locking rod, a vertical rod, a second bushing, a second locking rod, and a horizontal rod; the first bushing is fixedly connected to the left side of the upper surface of the base; the vertical rod is slidably connected in the first bushing, and a first locking rod for locking the vertical rod is provided on the side of the first bushing; the top end of the vertical rod is fixedly connected to the second bushing; the horizontal rod is slidably connected in the second bushing; a second locking rod for locking the horizontal rod is provided on the second bushing; the universal joint is connected to the right side of the horizontal rod.

[0014] Preferably, the applicator head is made of a flexible medical material and has several micropores for dispensing medication on its surface.

[0015] Preferably, the probe is a high-definition camera and is connected to an external display device.

[0016] Preferably, the connecting tube is a flexible medical hose.

[0017] Preferably, the inner surface of the ear pressing block is provided with a flexible pad.

[0018] Preferably, the inner side of the dental ring is provided with an anti-slip silicone layer.

[0019] The beneficial effects of the present invention are: (1) Improved clarity and accuracy of the operation field of vision: The device is equipped with a ring of LED lights at the connection between the laryngoscope probe and the main body, which can provide 360° uniform illumination of the rat's larynx. Combined with the high-definition camera probe and external display device, it can clearly present the details of the vocal cord area in real time, which solves the problem of positioning deviation caused by insufficient light or limited field of vision in traditional operation, and provides reliable visual support for accurate application.

[0020] (2) Achieving stable fixation of the rat's head: The head fixation component, through the cooperation of the head clamp and the adjustable ear pressing block, can be flexibly adjusted according to the size of the rat's head. Through the fine adjustment of the screw and handwheel, the rat's head can be stably fixed and the ear injury can be avoided. The third locking rod can further lock the position of the head clamp to prevent the head from shaking during operation. The tooth fixation component hooks the rat's teeth through the tooth hanging ring. Combined with the sliding adjustment of the arc rod and the locking function of the fourth locking rod, it can effectively restrict the rat's oral cavity movement, avoid the change of throat position caused by struggling, and ensure the stability of the application process. (3) Improve the accuracy and safety of drug delivery: The drug delivery component adopts a piston pusher structure. By manually controlling the pusher's advance speed and distance, the drug dosage can be precisely controlled, avoiding dosage errors when administering drugs with traditional tools. The design of the drug storage chamber and the drug inlet valve facilitates rapid drug replenishment and prevents drug contamination. The application head is made of flexible medical material, and the multiple drug dispensing micro-holes on the surface can ensure uniform drug distribution while avoiding scratches to the vocal cord mucosa by hard materials. The connecting tube is made of flexible medical tubing, which can be adapted to the multi-angle adjustment of the laryngoscope to ensure stable drug delivery.

[0021] (4) Enhance the flexibility and adaptability of the device: The adjustment component can adjust the position of the laryngoscope body in the up-down and left-right directions through the sliding cooperation of the vertical and horizontal rods; the universal head can flexibly adjust the angle of the laryngoscope so that the probe and the smearing head are accurately aligned with the vocal cord area, which is suitable for the operation needs of rats of different sizes and improves the versatility of the device.

[0022] (5) Simplify the operation process and improve experimental efficiency: The device integrates the functions of fixation, lighting, observation and drug administration, and a single person can complete the entire process from animal fixation to drug application without the need for multiple people to cooperate, which reduces the coordination error of the operation process and reduces the difficulty of operation for the experimenters, significantly improving experimental efficiency and repeatability.

[0023] (6) Ensuring the welfare and reliability of experimental animals: The flexible padding on the inner side of the ear pressing block, the anti-slip silicone layer on the inner side of the tooth ring, and the flexible applicator can all reduce mechanical damage to rats and meet the ethical requirements of animal experiments. At the same time, the precise fixation and drug administration methods can reduce experimental data deviations caused by improper operation and improve the scientificity and reliability of experimental results. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention.

[0025] Figure 2 This is a schematic diagram of the side structure of the head fixing component of the present invention.

[0026] Figure 3 This is a schematic diagram of the tooth ring of the present invention.

[0027] Figure 4 For the present invention Figure 1 A partially enlarged structural diagram.

[0028] Figure 5 This is a schematic diagram of the drug delivery component of the present invention.

[0029] 1-Base; 2-First bushing; 3-First locking rod; 4-Vertical rod; 5-Second bushing; 6-Second locking rod; 7-Horizontal rod; 8-Universal head; 9-Laryngoscope body; 10-Probe; 11-LED light mounting base; 12-LED light; 13-Applying head mounting rod; 14-Applying head; 15-Connecting tube; 16-Drug storage chamber; 17-Drug inlet valve; 18-Piston; 19-Push rod; 20-Handle; 21-Head clamp; 22-Slotted; 23-Mounting base; 24-First mounting block; 25-Third locking rod; 26-Second mounting block; 27-Screw; 28-Ear pressing block; 29-Handwheel; 30-Second mounting block; 31-Fourth locking rod; 32-Arc rod; 33-Tooth ring; 34-Limiting block. Detailed Implementation

[0030] like Figures 1 to 5 As shown, this specific embodiment adopts the following technical solution: a laryngoscope auxiliary device for precise application of medication to the vocal cords of rats, including a base 1, a universal head 8, a laryngoscope body 9, a probe 10, an LED light mounting base 11, an LED light 12, an application head mounting rod 13, an application head 14, a connecting tube 15, a head fixation component, a tooth fixation component, a medication delivery component, and an adjustment component; the adjustment component is provided on the upper left side of the base 1, and the head fixation component is provided on the upper right side of the base 1; the tooth fixation component is provided on the upper end of the head fixation component; the adjustment component... The laryngoscope body 9 is connected to the right side of the adjustment assembly, which has a universal joint 8 on the right side. The probe 10 is located at the right end of the laryngoscope body 9, and an LED light mounting base 11 is fixedly connected to the connection between the probe 10 and the laryngoscope body 9. An LED light mounting base 11 is provided with a ring of LED lights 12. An applicator mounting rod 13 is fixedly connected to the lower end of the laryngoscope body 9, and an applicator 14 is fixedly connected to the upper right end of the applicator mounting rod 13. The applicator 14 is connected to the medication delivery assembly through a connecting tube 15.

[0031] like Figures 1 to 5As shown, the head fixing assembly includes a head clamp 21, a slot 22, a mounting base 23, a first mounting block 24, a third locking rod 25, a second mounting block 26, a screw 27, an ear pressing block 28, and a handwheel 29. The mounting base 23 is fixedly connected to the right side of the upper surface of the base 1. The head clamp 21 is slidably connected to the mounting base 23. The head clamp 21 has slots 22 at both the front and rear ends. The second mounting blocks 26 are fixedly connected to both the front and rear ends of the mounting base 23. Each of the second mounting blocks 26 is threadedly connected to a screw 27, which is located in the slot 22. Each of the screw 27 has an ear pressing block 28 fixedly connected to the inner end face of the screw 27, and a handwheel 29 fixedly connected to the outer end face of the screw 27. The first mounting blocks 24 are fixedly connected to both the front and rear ends of the right side of the lower surface of the base 1, and each of the first mounting blocks 24 has a third locking rod 25 for locking the head clamp 21.

[0032] like Figures 1 to 5 As shown, the dental fixation assembly includes a second mounting block 30, a fourth locking rod 31, an arc rod 32, a dental ring 33, and a limiting block 34; the second mounting block 30 is fixedly connected to the top of the head clamp 21; the arc rod 32 is slidably connected to the second mounting block 30; the dental ring 33 is fixedly connected to the left side of the arc rod 32, and the limiting block 34 is fixedly connected to the right side of the arc rod 32; the fourth locking rod 31 for locking the arc rod 32 is provided on the top of the second mounting block 30.

[0033] like Figures 1 to 5 As shown, the drug delivery assembly includes a drug storage chamber 16, a drug inlet valve 17, a piston 18, a push rod 19, and a handle 20. The drug storage chamber 16 is fixedly connected to the left side of the upper surface of the crossbar 7. The drug outlet end of the drug storage chamber 16 is connected to the connecting pipe 15. The drug inlet valve 17 is fixedly connected to the upper right side of the drug storage chamber 16. The piston 18 is slidably connected in the drug storage chamber 16. The push rod 19 is fixedly connected to the right end of the piston 18. The handle 20 is fixedly connected to the right end of the push rod 19.

[0034] like Figures 1 to 5 As shown, the adjustment assembly includes a first bushing 2, a first locking rod 3, a vertical rod 4, a second bushing 5, a second locking rod 6, and a horizontal rod 7; the first bushing 2 is fixedly connected to the left side of the upper surface of the base 1; the vertical rod 4 is slidably connected in the first bushing 2, and a first locking rod 3 for locking the vertical rod 4 is provided on the side of the first bushing 2; the top end of the vertical rod 4 is fixedly connected to the second bushing 5; the horizontal rod 7 is slidably connected in the second bushing 5; a second locking rod 6 for locking the horizontal rod 7 is provided on the second bushing 5; the universal joint 8 is connected to the right side of the horizontal rod 7.

[0035] The application head 14 is made of flexible medical material and has several micro-holes for dispensing medicine on its surface; the probe 10 is a high-definition camera and is connected to an external display device; the connecting tube 15 is a flexible medical tube; the inner surface of the ear pressing block 28 is provided with a flexible pad; and the inner side of the dental ring 33 is provided with an anti-slip silicone layer.

[0036] The usage state of this invention is as follows: (1) Device preparation: Place the device on a stable workbench and ensure that the base 1 is stable. Adjust the position of the laryngoscope body 9 by adjusting the components. Specifically, loosen the first locking rod 3, slide the vertical rod 4 up and down in the first bushing 2, and tighten the first locking rod 3 after reaching a suitable height; loosen the second locking rod 6, slide the horizontal rod 7 left and right in the second bushing 5, and tighten the second locking rod 6 after adjusting to a suitable horizontal position. Then adjust the angle of the laryngoscope body 9 by using the universal head 8 so that the probe 10 and the smearing head 14 can be smoothly inserted into the rat's larynx.

[0037] (2) Rat fixation: Head fixation: Place the rat's head into the head clamp 21, slide the head clamp 21 in the mounting base 23 to fit the rat's head, and then lock the head clamp 21 by the third locking rod 25 on the first mounting block 24. Turn the handwheel 29 to drive the screw 27 to rotate in the second mounting block 26, causing the ear pressing block 28 to move inward until it gently presses on the rat's ear, thus achieving stable fixation of the head. The flexible padding layer on the inner side of the ear pressing block 28 can prevent damage to the rat's ear. Tooth fixation: Slide the arc rod 32 in the second mounting block 30 to hook the tooth hook 33 onto the rat's teeth. The anti-slip silicone layer on the inner side of the tooth hook 33 can prevent the rat's teeth from sliding. Then lock the arc rod 32 by the fourth locking rod 31 to restrict the rat's oral movement.

[0038] (3) Drug preparation: Open the drug inlet valve 17, inject an appropriate amount of drug into the drug storage chamber 16, and then close the drug inlet valve 17.

[0039] (4) Observation and positioning: Turn on the LED light 12. The LED light 12 is fixed to the connection between the probe 10 and the laryngoscope body 9 through the LED light mounting bracket 11 to provide 360° uniform illumination to the rat's larynx. The probe 10 acts as a high-definition camera to transmit the image of the rat's larynx to an external display device. The operator can further adjust the universal head 8 by observing the image on the external display device so that the smear head 14 is accurately aligned with the rat's vocal cord area.

[0040] (5) Drug application: Hold handle 20 and push push rod 19 to drive piston 18 to slide in drug storage chamber 16, delivering the drug in drug storage chamber 16 to application head 14 through connecting tube 15. The drug is then evenly applied to the rat's vocal cords through the drug dispensing micropores on the surface of application head 14. Connecting tube 15 is a flexible medical tube that can be adapted to the multi-angle adjustment of laryngoscope to ensure stable drug delivery.

[0041] (6) Operation completed: After the application is completed, pull the handle 20 in the opposite direction to reset the piston 18. Release the fourth locking rod 31, the third locking rod 25 and the handwheel 29 in sequence, remove the rat from the device, turn off the LED light 12, and complete the entire operation.

[0042] In the description of this invention, it should be understood that the terms "coaxial," "bottom," "one end," "top," "middle," "other end," "upper," "side," "top," "inner," "front," "center," "both ends," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0043] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0044] 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 illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope. All such changes and modifications fall within the scope of the present invention as claimed, which is defined by the appended claims and their equivalents.

[0045] The control method of this invention is to control the device by manually starting and stopping the switch. The wiring diagram of the power element and the supply of power are common knowledge in the field. Since this invention is mainly used to protect mechanical devices, the control method and wiring layout will not be explained in detail.

Claims

1. A laryngoscope-assisted device for precise application of ointment to the vocal cords of rats, characterized in that: Includes base (1), universal head (8), laryngoscope body (9), probe (10), LED light mounting base (11), LED light (12), smear head mounting rod (13), smear head (14), connecting tube (15), head fixation assembly, tooth fixation assembly, drug delivery assembly and adjustment assembly; An adjustment component is provided on the upper left side of the base (1), and a head fixing component is provided on the upper right side of the base (1); The upper end of the head fixation component is provided with a tooth fixation component; A drug delivery component is located on the left side of the adjustment component; The right side of the adjustment component is provided with a universal head (8); The laryngoscope body (9) is connected to the right side of the universal head (8); The laryngoscope body (9) is provided with a probe (10) at the right end. An LED lamp mounting base (11) is fixedly connected to the connection between the probe (10) and the laryngoscope body (9). An LED lamp (12) is provided on the LED lamp mounting base (11). The laryngoscope body (9) is fixedly connected to the lower end of the smear head mounting rod (13), and the smear head (14) is fixedly connected to the upper right end of the smear head mounting rod (13). The smear head (14) is connected to the drug delivery assembly through the connecting tube (15).

2. The laryngoscope-assisted device for precise application of ointment to the vocal cords of rats according to claim 1, characterized in that: The head fixing assembly includes a head clamp (21), a slot (22), a mounting base (23), a first mounting block (24), a third locking rod (25), a second mounting block (26), a screw (27), an ear pressing block (28), and a handwheel (29). The mounting base (23) is fixedly connected to the right side of the upper surface of the base (1); A head clamp (21) is slidably connected in the mounting base (23); The head clamp (21) has slots (22) at both the front and rear ends; The mounting base (23) is fixedly connected to the front and rear ends of the second mounting block (26); Each of the second mounting blocks (26) is connected by a screw (27) via a thread, and the screw (27) is located in the slot (22); Ear pressing blocks (28) are fixedly connected to the inner end face of the screw (27), and handwheels (29) are fixedly connected to the outer end face of the screw (27). The base (1) has a first mounting block (24) fixedly connected to the front and rear ends of the right side of the lower surface. The first mounting block (24) is provided with a third locking rod (25) for locking the head clamp (21).

3. The laryngoscope-assisted device for precise application of ointment to the vocal cords of rats according to claim 1, characterized in that: The dental fixation assembly includes a second mounting block (30), a fourth locking rod (31), an arc rod (32), a dental ring (33), and a limiting block (34). A second mounting block (30) is fixedly connected to the top of the head clamp (21). A circular arc rod (32) is slidably connected in the second mounting block (30); A toothed lifting ring (33) is fixedly connected to the left side of the arc rod (32), and a limit block (34) is fixedly connected to the right side of the arc rod (32). The second mounting block (30) has a fourth locking rod (31) at its top for locking the arc rod (32).

4. The laryngoscope-assisted device for precise application of ointment to the vocal cords of rats according to claim 1, characterized in that: The drug delivery assembly includes a drug storage chamber (16), a drug inlet valve (17), a piston (18), a push rod (19), and a handle (20). The medicine storage chamber (16) is fixedly connected to the left side of the upper surface of the crossbar (7); The dispensing end of the medicine storage chamber (16) is connected to the connecting pipe (15); The upper right side of the medicine storage chamber (16) is fixedly connected to a medicine inlet valve (17). A piston (18) is slidably connected in the drug storage chamber (16). A push rod (19) is fixedly connected to the right end of the piston (18). A handle (20) is fixedly connected to the right end of the push rod (19).

5. The laryngoscope-assisted device for precise application of ointment to the vocal cords of rats according to claim 1, characterized in that: The adjustment assembly includes a first bushing (2), a first locking rod (3), a vertical rod (4), a second bushing (5), a second locking rod (6), and a horizontal rod (7). The first bushing (2) is fixedly connected to the left side of the upper surface of the base (1); A vertical rod (4) is slidably connected in the first bushing (2), and a first locking rod (3) for locking the vertical rod (4) is provided on the side of the first bushing (2). The top end of the vertical rod (4) is fixedly connected to a second bushing (5); A crossbar (7) is slidably connected in the second bushing (5); The second bushing (5) is provided with a second locking rod (6) for locking the crossbar (7); The universal joint (8) is connected to the right side of the crossbar (7).

6. The laryngoscope-assisted device for precise application of ointment to the vocal cords of rats according to claim 1, characterized in that: The applicator (14) is made of flexible medical material and has several micropores for dispensing medicine on its surface.

7. The laryngoscope-assisted device for precise application of ointment to the vocal cords of rats according to claim 1, characterized in that: The probe (10) is a high-definition camera and is connected to an external display device.

8. The laryngoscope-assisted device for precise application of ointment to the vocal cords of rats according to claim 1, characterized in that: The connecting tube (15) is a flexible medical hose.

9. The laryngoscope-assisted device for precise application of ointment to the vocal cords of rats according to claim 2, characterized in that: The inner surface of the ear pressing block (28) is provided with a flexible pad.

10. The laryngoscope-assisted device for precise application of ointment to the vocal cords of rats according to claim 3, characterized in that: The inner side of the tooth ring (33) is provided with an anti-slip silicone layer.

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