Clinical oral cavity opening device for department of stomatology

Abstract

The invention discloses a clinical oral cavity opening device for the stomatology department, and relates to the technical field of medical instruments.The clinical oral cavity opening device for the stomatology department comprises an opening support, an opening control mechanism and an opening prompting mechanism. A pressing ring located on the outer side of the lower color zone separation ring makes contact with the supporting plate, at the moment, pressing columns on the two sides of the upper surface of the pressing ring upwards extrude air bag cushions on the left side and the right side of the lower surface of the supporting plate, and when the air bag cushions are extruded, small blowpipes can make whistles at the moment; after hearing the whistle of the small blowpipe, an oral clinician shows that the opening amplitude of the oral cavity of the patient is large, and in this way, the dental clinician can judge whether the opening amplitude of the oral cavity of the patient is too large or not by using the opening device by combining and observing the color exposure position of the color prompt ring and the form of whether the whistle exists or not; therefore, a certain protection effect is achieved on the patient.

Description

Technical Field

[0001] This invention relates to an oral cavity opening device, and more particularly to an oral cavity opening device for clinical use in dentistry. Background Technology

[0002] Oral opening devices are a commonly used tool in clinical dental procedures. They are mainly used to help patients keep their mouths open during treatment so that dental clinicians can make diagnosis and treatment. Clinically, when a patient's jaw is clenched, this opening device can be used to open the mouth, inject medication or nutrients, and at the same time prevent tongue biting.

[0003] In response, Chinese patent application number CN114224675A discloses an oral opening device suitable for clinical use in dentistry, comprising a movable frame, a vertical plate mounted on one side of the upper end of the movable frame, a power mechanism mounted on the vertical plate, an mounting plate mounted on the power mechanism, an adjustment mechanism mounted on the mounting plate, a first movable plate mounted on the adjustment mechanism, a horizontal axis fixed on the first movable plate, a second movable plate fixed to one end of the horizontal axis, an adaptation mechanism mounted on the second movable plate, and a connecting rod mounted on the adaptation mechanism. This invention can effectively automate rehabilitation training and facilitate adjustment by staff, thus enabling gradual rehabilitation training. It solves the problem of rigid and unadjustable opening degrees in previous rehabilitation training, effectively ensuring that patients do not rotate their heads arbitrarily during rehabilitation training, protecting the oral cavity, and improving the effectiveness and quality of use.

[0004] Chinese patent application CN112932687B discloses an oral cavity opening device suitable for clinical use in dentistry, comprising a neck pillow, a support plate, a top plate, a shoulder pressure plate, a stepper motor, a fixing plate, adjusting rods, adjusting nuts, an upper support plate, a lower support plate, and a PLC controller. The neck pillow is a T-shaped plate with two support plates fixedly connected to its top two ends. The shoulder pressure plate is fixedly fastened to the center of the top surface of the screw plate by fixing bolts. Slanted downward suspension rods are fixedly connected to the lower outer wall of each adjusting nut. A lower support plate is fixedly connected between the lower ends of the two suspension rods on the left side, and an upper support plate is fixedly connected between the lower ends of the two suspension rods on the right side. The stepper motor is electrically connected to the PLC controller via wires. This invention has a reasonable structural design and can control the upper and lower support plates to gradually open the patient's oral cavity as needed, or control its cyclical opening and closing for rehabilitation training. The opening size is adjustable and controllable, and it is simple and convenient to use.

[0005] Based on the aforementioned prior art and the descriptions in the comparative documents: The operation of oral opening devices depends on the skill level of the oral clinician. During the operation, the oral clinician may have difficulty controlling the opening range due to individual differences and different conditions. If the oral opening device opens the patient's mouth too much, it may cause the patient to feel intense pain during the treatment and increase the patient's suffering. Therefore, it is necessary to design an oral opening device that can facilitate the oral clinician to observe the opening range and has an early warning function. Summary of the Invention

[0006] The purpose of this invention is to provide an oral cavity opening device for clinical use in dentistry, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a dental clinical oral opening device, comprising an opening support, an opening control mechanism, and an opening prompting mechanism. Each of the two opening supports has an opening prompting mechanism on its outer surface. Each opening prompting mechanism includes a support plate, a through-feeding rod, color-zone separators, color-marking rings, and a small blowpipe. The support plate has a connecting hole in the middle, through which the through-feeding rod passes. Multiple color-zone separators are fixedly connected to the lower outer surface of the through-feeding rod. A color-marking ring is provided between two adjacent color-zone separators. The color-marking ring is sleeved on the outside of the through-feeding rod and fixedly connected to it. A pressing ring is fixedly connected to the outside of the lower color-marking ring. Pressing posts are fixedly connected to the left and right sides of the upper surface of the pressing ring. Airbag cushions are provided directly above each of the two pressing posts. The two airbag cushions are respectively fixed... The two airbags are fixedly connected to the left and right sides of the lower surface of the support plate. Small blowing tubes are fixedly connected to the outer sides of both airbags, and the inner ends of the small blowing tubes are connected to the airbags. An opening control mechanism is provided on the inner side of the opening bracket. The opening control mechanism includes a hand crank, a transmission gear, a connecting shaft, a meshing gear, a connecting arm and a connecting rod, a fixed shaft one and a fixed shaft two. The rear end of the fixed shaft two is fixedly connected to the outer side of the opening bracket. A connecting rod is provided through the outer side of the front end of the fixed shaft two, and the fixed shaft two is rotatably connected to the connecting rod. The end of the connecting rod away from the fixed shaft two is rotatably connected to the opening bracket. A through indicator rod is fixedly connected to the lower surface of the front end of the fixed shaft two. A fixed shaft one is provided directly below the fixed shaft two. The inner end of the fixed shaft one is fixedly connected to the outer side of the opening bracket. The outer end of the fixed shaft one is through a lower opening rod, and the lower opening rod is rotatably connected to the fixed shaft one. A support plate is fixedly connected to the outer end of the fixed shaft one.

[0008] As a preferred embodiment of the present invention, the two transmission gears are rotatably connected to the inner sides of the two opening brackets, a connecting shaft is fixedly connected between the two transmission gears, meshing gears are meshed on the front sides of the two transmission gears, and connecting arms are fixedly connected on the front sides of the two meshing gears.

[0009] With the above technical solution, when a dental clinician cranks the hand crank, one of the transmission gears can rotate, and the other transmission gear can rotate synchronously under the action of the connecting shaft connected to the transmission gear.

[0010] As a preferred embodiment of the present invention, the front end of the connecting arm is provided with a cavity wall support mechanism, the cavity wall support mechanism includes an oral pad, a tooth limiting block and an arching part, and the front end of the connecting arm is rotatably connected to the inner wall of the oral pad.

[0011] With the above technical solution, the patient's mouth can be opened by the downward swinging force of the oral pad. The patient's mouth can be opened by shaking the hand crank.

[0012] As a preferred embodiment of the present invention, a rubber ring is provided at the front end of the oral pad, an arched portion is provided at the rear side of the rubber ring, a limiting tooth block is provided at the rear side of the arched portion, and the limiting tooth block is fixedly connected to the oral pad.

[0013] Through the above technical solution, the arched part can fit against the patient's oral cavity wall, and the limiting block is used for the patient's teeth to bite, preventing the opening and closing device from disengaging from the patient's oral cavity.

[0014] As a preferred embodiment of the present invention, the upper and lower sides of the opening bracket are rotatably connected to an upper opening rod and a lower opening rod, respectively, and the ends of the upper and lower opening rods away from the opening bracket are rotatably connected to two oral pads.

[0015] With the above technical solution, the oral clinician manually cranks the hand crank to rotate the transmission gear. After the transmission gear rotates, the meshing gear connected to the transmission gear also rotates. As the meshing gear rotates, the front end of the connecting arm located in front of the meshing gear swings upward, and the oral pad located on the lower side connected to the connecting arm swings upward at the rear end and downward at the front end.

[0016] As a preferred embodiment of the present invention, a gear limiting mechanism is provided on the inner side of the rear end of the opening bracket. The gear limiting mechanism includes a fixed rod, a sliding arm, and a limiting tooth. The fixed rod is fixedly connected to the opening bracket.

[0017] With the above technical solution, before using the opening device, the sliding arm needs to be disengaged from the meshing gear.

[0018] As a preferred embodiment of the present invention, the fixed rod passes through the sliding arm in the middle, and the sliding arm is slidably connected to the fixed rod. The lower end of the sliding arm is fixedly connected to a limiting tooth, which is disposed inside the gear groove of the meshing gear.

[0019] With the above technical solution, if it is necessary to fix the open position, the oral clinician can manually move the sliding arm inward so that the limiting tooth at the lower end of the sliding arm is engaged in the gear groove of the transmission gear. At this time, the upper and lower oral pads are restricted and fixed under the action of the limiting tooth, preventing the upper and lower oral pads from moving inward due to the patient's biting.

[0020] As a preferred embodiment of the present invention, a fixing plate is fixedly connected to the upper end of the two opening brackets, and a hand handle is fixedly connected to the upper surface of the fixing plate.

[0021] With the above technical solution, the outer surface of the handle is provided with an anti-slip sleeve, so that when the device is opened for use, the oral clinician can hold the handle with one hand and pick up the entire device.

[0022] As a preferred embodiment of the present invention, a hand crank is rotatably connected to the outer rear end of each of the two opening brackets, and the inner end of the hand crank is connected to a transmission gear.

[0023] The above technical solution allows the transmission gears to rotate by manually cranking the hand crank.

[0024] As a preferred embodiment of the present invention, the material of the arched portion is latex.

[0025] Through the above technical solution, the latex material has a certain degree of softness, preventing the oral pad from damaging the patient's oral cavity wall.

[0026] Compared with the prior art, the beneficial effects of the present invention are: This invention utilizes an opening indicator mechanism. During the process of a dentist using an oral retractor to open a patient's mouth, as the upper and lower oral pads expand outwards, the patient's mouth is gradually opened by these pads. Due to the increasing distance between the two oral pads, a through-beam indicator located on the outer side of the upper oral pad gradually moves upwards from inside the support plate on the outer side of the lower oral pad. As the through-beam indicator moves upwards, the dentist can observe the position of multiple colored indicator rings on the lower outer side of the through-beam indicator and the connecting hole in the middle of the support plate to understand the extent of the patient's mouth opening. The upper, middle, and lower colored indicator rings are blue, yellow, and red, respectively. When the patient's mouth is opened too wide, the lower colored indicator ring moves upwards to the upper surface of the support plate. When the dentist observes a red area, it indicates that the patient's mouth opening is insufficient. Furthermore, during the process of a patient opening their mouth, if the dentist fails to observe the position of the color-marking ring and the support plate in time due to observing the patient's oral pathology, as the through-marking rod moves to a higher position, the pressing ring located outside the lower color-separating ring comes into contact with the support plate. At this time, the pressing posts on both sides of the upper surface of the pressing ring press upwards against the air cushions on the left and right sides of the lower surface of the support plate. When the air cushions are compressed, the airflow inside the air cushions rushes into the small blowpipe, which can then emit a whistling sound. When the dentist hears the whistling sound from the small blowpipe, it indicates that the patient's mouth opening is too large. In this way, by combining the observation of the color-marking ring's exposure position and the presence of a whistling sound, the dentist can determine whether the use of the opening device is causing the patient's mouth to open too wide, thus providing a certain degree of protection for the patient. This invention utilizes an opening control mechanism. Before using the opening device, the dentist holds the handle with one hand and inserts the sterilized oral pad at the front end of the opening device into the patient's mouth, ensuring that the upper and lower sides of the oral pad fit against the upper and lower walls of the patient's mouth. The dentist then manually cranks the hand crank, causing the transmission gear to rotate. As the transmission gear rotates, the meshing gear connected to it also rotates. With the rotation of the meshing gear, the front end of the connecting arm located in front of the meshing gear swings upward, causing the oral pad, located on the lower side connected to the connecting arm, to swing upward at its rear end and downward at its front end. Due to the downward swing of the front end of the oral pad, the patient's mouth can be opened using the swinging force of the oral pad. In this way, the patient's mouth can be opened by cranking the hand crank. The present invention uses a gear limiting mechanism. When it is necessary to fix the open position, the dentist can manually move the sliding arm inward so that the limiting tooth at the lower end of the sliding arm is engaged in the gear groove of the transmission gear. At this time, the upper and lower oral pads are restricted and fixed by the limiting tooth, preventing the oral pads in the upper and lower positions from moving inward due to the patient's biting. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the front structure of the present invention; Figure 2 This is a schematic diagram of the rear structure of the present invention; Figure 3 This is a structural schematic diagram of the invention from an oblique, top-down perspective; Figure 4 This is a schematic diagram of the structure of the open support inner wall in this invention; Figure 5 This is a schematic diagram of the opening prompting mechanism in this invention; Figure 6 This is a schematic diagram of the cavity wall support mechanism in this invention; Figure 7 For the present invention Figure 3 A magnified view of A in the middle.

[0028] In the diagram: 1. Opening bracket; 2. Fixing plate; 3. Hand handle; 4. Opening control mechanism; 401. Hand crank; 402. Transmission gear; 403. Connecting shaft; 404. Meshing gear; 405. Connecting arm; 406. Lower opening rod; 407. Upper opening rod; 408. Connecting rod; 409. Fixing shaft one; 410. Fixing shaft two; 5. Opening prompting mechanism; 501. Support plate; 502. Connecting... 503. Through hole; 504. Through indicator rod; 505. Color zone separator ring; 506. Color indicator ring; 507. Press ring; 508. Press post; 509. Airbag cushion; 5000. Small blowpipe; 6. Cavity wall support mechanism; 601. Oral pad; 602. Tooth limiting block; 603. Arched part; 604. Rubber ring; 7. Gear limiting mechanism; 701. Fixed rod; 702. Sliding arm; 703. Limiting tooth. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Please see Figure 1-7 This invention provides a technical solution for an oral opening device used in clinical dentistry: according to Figure 1 , Figure 2 and Figure 3 , Figure 5 and Figure 7As shown, a dental clinical oral opening device includes an opening bracket 1, an opening control mechanism 4, and an opening prompting mechanism 5. Each of the two opening brackets 1 has an opening prompting mechanism 5 on its outer surface. The opening prompting mechanism 5 includes a support plate 501, a through-feeding rod 503, color-zone separators 504, color-indicating rings 505, and a small blowpipe 509. The support plate 501 has a connecting hole 502 in the middle, through which the through-feeding rod 503 passes. Multiple color-zone separators 504 are fixedly connected to the lower outer surface of the through-feeding rod 503. A color-indicating ring 505 is provided between each pair of adjacent color-zone separators 504. The upper, middle, and lower color-indicating rings 505... The colors are blue, yellow, and red. When the patient's mouth is opened too wide, the lower color indicator ring 505 moves up to the upper surface of the support plate 501. When the dentist observes the red area, it indicates that the patient's mouth is open too wide. The color indicator ring 505 is fitted over the outside of the through indicator rod 503 and is fixedly connected to the through indicator rod 503. A pressing ring 506 is fixedly connected to the outside of the lower color indicator ring 505. Pressing posts 507 are fixedly connected to the left and right sides of the upper surface of the pressing ring 506. An airbag cushion 508 is set directly above each of the two pressing posts 507. The two airbag cushions 508 are fixedly connected to the left and right sides of the lower surface of the support plate 501, respectively. On both sides, small blowpipes 509 are fixedly connected to the outer sides of the two air cushions 508, and the inner ends of the small blowpipes 509 are connected to the air cushions 508. If the oral clinician does not observe the position of the color indicator ring 505 and the support plate 501 in time due to observing the patient's oral pathology, as the through indicator rod 503 moves to a higher position, the pressing ring 506 located outside the lower color zone separator ring 504 comes into contact with the support plate 501. At this time, the pressing posts 507 on both sides of the upper surface of the pressing ring 506 press upwards to squeeze the air cushions 508 on the left and right sides of the lower surface of the support plate 501. When the air cushions 508 are squeezed, the airflow inside the air cushions 508 rushes into the small blowpipes 509. Inside the 9th chamber, the small blowpipe 509 can emit a whistle. An opening control mechanism 4 is installed inside the opening bracket 1. The opening control mechanism 4 includes a hand crank 401, a transmission gear 402, a connecting shaft 403, a meshing gear 404, a connecting arm 405, a connecting rod 408, a first fixed shaft 409, and a second fixed shaft 410. The rear end of the second fixed shaft 410 is fixedly connected to the outside of the opening bracket 1. A connecting rod 408 is provided through the outer side of the front end of the second fixed shaft 410, and the second fixed shaft 410 is rotatably connected to the connecting rod 408. The end of the connecting rod 408 away from the second fixed shaft 410 is rotatably connected to the opening bracket 1. A through indicator rod 503 is fixedly connected to the lower surface of the front end of the second fixed shaft 410.A fixed shaft 409 is located directly below the second fixed shaft 410. The inner end of the first fixed shaft 409 is fixedly connected to the outer side of the opening bracket 1. The outer end of the first fixed shaft 409 passes through the lower support rod 406, and the lower support rod 406 is rotatably connected to the first fixed shaft 409. A support plate 501 is fixedly connected to the outer end of the first fixed shaft 409. Two transmission gears 402 are rotatably connected to the inner sides of the two opening brackets 1, respectively. A connecting shaft 403 is fixedly connected between the two transmission gears 402. Meshing gears 404 are meshed with the front sides of both transmission gears 402. Connecting arms 405 are fixedly connected to the front sides of both meshing gears 404.

[0031] according to Figure 2 , Figure 3 , Figure 4 As shown, the front end of the connecting arm 405 is provided with a cavity wall support mechanism 6. The cavity wall support mechanism 6 includes an oral pad 601, a tooth limiting block 602, and an arched part 603. The front end of the connecting arm 405 is rotatably connected to the inner wall of the oral pad 601. The front end of the oral pad 601 is provided with a rubber ring 604. The arched part 603 is provided on the rear side of the rubber ring 604. The tooth limiting block 602 is provided on the rear side of the arched part 603. The tooth limiting block 602 is fixedly connected to the oral pad 601. The shape of the arched part 603 is adapted to the shape of the human oral cavity wall and can fit against the oral cavity wall.

[0032] according to Figure 1 , Figure 4 , Figure 6 As shown, an upper support rod 407 and a lower support rod 406 are rotatably connected to the upper and lower sides of the opening bracket 1, respectively. The ends of the upper support rod 407 and the lower support rod 406 away from the opening bracket 1 are rotatably connected to two oral pads 601, respectively. A gear limiting mechanism 7 is provided on the inner side of the rear end of the opening bracket 1. The gear limiting mechanism 7 includes a fixed rod 701, a sliding arm 702, and a limiting tooth 703. The fixed rod 701 is fixedly connected to the opening bracket 1, and the sliding arm 702 passes through the middle of the fixed rod 701. The sliding arm 702 is slidably connected to the fixed rod 701. The lower end of the sliding arm 702 is fixedly connected to the limiting tooth 703, which is located inside the gear groove of the meshing gear 404. The upper ends of the two opening brackets 1 are fixedly connected to the fixed plate 2. The upper surface of the fixed plate 2 is fixedly connected to the hand handle 3. The outer surface of the hand handle 3 is provided with an anti-slip sleeve. The outer rear ends of the two opening brackets 1 are rotatably connected to the hand crank 401. The inner end of the hand crank 401 is connected to the transmission gear 402. The arched part 603 is made of latex.

[0033] In practical use, this invention provides a dental clinical oral opening device. Before use, the dentist holds the handle 3 with one hand and inserts the sterilized oral pad 601 at the front end of the opening device into the patient's mouth, ensuring that the upper and lower oral pads 601 fit against the upper and lower walls of the patient's oral cavity. The dentist then manually cranks the hand crank 401, causing the transmission gear 402 to rotate. As the transmission gear 402 rotates, the meshing gear 404, which meshes with it, also rotates. The connecting arm 405, located in front of the meshing gear 404, swings upwards. The oral cavity pad 601, connected to the connecting arm 405 at its lower position, swings upwards from its rear end and downwards from its front end. Due to the downward swing of the front end of the oral cavity pad 601, the patient's mouth can be opened using the force of this swing. If it is necessary to fix the opening position, the dentist can manually move the sliding arm 702 inwards, causing the limiting tooth 703 at the lower end of the sliding arm 702 to engage in the gear groove of the transmission gear 402. At this time, the oral cavity pad 601 in its upper and lower positions... Under the action of the limiting tooth 703, the upper and lower oral pads 601 are restricted and fixed, preventing them from moving inward due to the patient's biting. During the process of the dentist using the oral retractor to open the patient's mouth, as the upper and lower oral pads 601 expand outward, the patient's mouth is gradually opened by the upper and lower oral pads 601. As the distance between the two oral pads 601 gradually increases, the through-beam indicator 503 located on the outside of the upper oral pad 601 gradually moves upward from inside the support plate 501 on the outside of the lower oral pad 601, indicating the through-beam indicator... During the upward movement of rod 503, the oral clinician can observe the position of the multiple color indicator rings 505 that run through the lower outer side of the indicator rod 503 and the connecting hole 502 in the middle of the support plate 501 to understand the patient's oral cavity opening range. The colors of the upper, middle and lower color indicator rings 505 are blue, yellow and red, respectively. When the patient's oral cavity opens too wide, the lower color indicator ring 505 moves up to the upper surface of the support plate 501. After the oral clinician observes the red area, it indicates that the patient's oral cavity opening range is large at this time. In addition, during the process of the patient's oral cavity opening... If the dentist fails to observe the position of the color indicator ring 505 and the support plate 501 in time due to observation of the patient's oral pathology, as the through indicator rod 503 moves to a higher position, the pressing ring 506 located outside the lower color zone separator ring 504 comes into contact with the support plate 501. At this time, the pressing posts 507 on both sides of the upper surface of the pressing ring 506 press upwards against the air cushions 508 on both sides of the lower surface of the support plate 501. When the air cushions 508 are compressed, the airflow inside the air cushions 508 rushes into the small blowpipe 509, which can then emit a whistling sound. After hearing the whistling sound from the small blowpipe 509, the dentist indicates that the patient's mouth is open to a large extent. After the patient's mouth is open, the dentist can perform examinations or medications in the patient's oral cavity.

[0034] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A dental clinical oral opening device, comprising an opening support (1), an opening control mechanism (4), and an opening prompting mechanism (5), characterized in that: Both of the opening brackets (1) are provided with an opening prompting mechanism (5) on their outer surfaces. The opening prompting mechanism (5) includes a support plate (501), a through prompting rod (503), color zone separators (504), a color prompting ring (505), and a small blowpipe (509). The support plate (501) has a connecting hole (502) in the middle. The through prompting rod (503) is provided through the middle of the connecting hole (502). Multiple color zone separators (504) are fixedly connected to the lower outer surface of the through prompting rod (503). A color prompting ring (505) is provided between two adjacent color zone separators (504). The color indicator ring (505) is sleeved on the outside of the through indicator rod (503), and the color indicator ring (505) is fixedly connected to the through indicator rod (503). A pressing ring (506) is fixedly connected to the outside of the lower end of the color indicator ring (505). Pressing posts (507) are fixedly connected to both sides of the upper surface of the pressing ring (506). An airbag cushion (508) is provided directly above the two pressing posts (507). The two airbag cushions (508) are fixedly connected to the left and right sides of the lower surface of the support plate (501), respectively. A small blowing tube (509) is fixedly connected to the outside of the two airbag cushions (508). Furthermore, the inner end of the small blowpipe (509) is connected to the airbag cushion (508). An opening control mechanism (4) is provided on the inner side of the opening bracket (1). The opening control mechanism (4) includes a hand crank (401), a transmission gear (402), a connecting shaft (403), a meshing gear (404), a connecting arm (405), a connecting rod (408), a fixed shaft one (409), and a fixed shaft two (410). The rear end of the fixed shaft two (410) is fixedly connected to the outer side of the opening bracket (1). A connecting rod (408) is provided through the outer side of the front end of the fixed shaft two (410). The fixed shaft two (410) is connected to the connecting rod (408). The rod (408) is rotatably connected. The end of the connecting rod (408) away from the fixed shaft two (410) is rotatably connected to the opening bracket (1). A through-feeding rod (503) is fixedly connected to the lower surface of the front end of the fixed shaft two (410). A fixed shaft one (409) is provided directly below the fixed shaft two (410). The inner end of the fixed shaft one (409) is fixedly connected to the outer side of the opening bracket (1). The outer end of the fixed shaft one (409) passes through the lower support rod (406), and the lower support rod (406) is rotatably connected to the fixed shaft one (409). A support plate (501) is fixedly connected to the outer end of the fixed shaft one (409).

2. The oral cavity opening device for clinical use in dentistry according to claim 1, characterized in that: The two transmission gears (402) are rotatably connected to the inner side of the two opening brackets (1), and a connecting shaft (403) is fixedly connected between the two transmission gears (402). The front sides of the two transmission gears (402) are meshed with meshing gears (404), and the front sides of the two meshing gears (404) are fixedly connected with connecting arms (405).

3. The oral cavity opening device for clinical use in dentistry according to claim 2, characterized in that: The connecting arm (405) is provided with a cavity wall support mechanism (6) at its front end. The cavity wall support mechanism (6) includes an oral pad (601), a tooth limiting block (602), and an arching part (603). The front end of the connecting arm (405) is rotatably connected to the inner wall of the oral pad (601).

4. The oral cavity opening device for clinical use in dentistry according to claim 3, characterized in that: The oral pad (601) has a rubber ring (604) at its front end, an arched part (603) at the rear side of the rubber ring (604), and a limiting tooth block (602) at the rear side of the arched part (603). The limiting tooth block (602) is fixedly connected to the oral pad (601).

5. The oral cavity opening device for clinical use in dentistry according to claim 1, characterized in that: The opening bracket (1) has an upper opening rod (407) and a lower opening rod (406) rotatably connected to its upper and lower sides respectively. The ends of the upper opening rod (407) and the lower opening rod (406) away from the opening bracket (1) are rotatably connected to two oral pads (601) respectively.

6. The oral cavity opening device for clinical use in dentistry according to claim 1, characterized in that: The inner rear end of the opening bracket (1) is provided with a gear limiting mechanism (7). The gear limiting mechanism (7) includes a fixed rod (701), a sliding arm (702) and a limiting tooth (703). The fixed rod (701) is fixedly connected to the opening bracket (1).

7. A dental clinical oral opening device according to claim 6, characterized in that: The fixed rod (701) passes through the sliding arm (702) in the middle, and the sliding arm (702) is slidably connected to the fixed rod (701). The lower end of the sliding arm (702) is fixedly connected to a limiting tooth (703), which is located inside the gear groove of the meshing gear (404).

8. The oral cavity opening device for clinical use in dentistry according to claim 1, characterized in that: The two opening brackets (1) are fixedly connected to the upper ends of the fixing plates (2), and the upper surface of the fixing plates (2) is fixedly connected to the hand handles (3).

9. A dental clinical oral opening device according to claim 1, characterized in that: Both of the two opening brackets (1) are rotatably connected to a hand crank (401) on the outer rear end, and the inner end of the hand crank (401) is connected to the transmission gear (402).

10. A dental clinical oral opening device according to claim 4, characterized in that: The arched part (603) is made of latex.

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