Oral cavity expansion support for department of stomatology

Abstract

The invention relates to the technical field of oral cavity auxiliary instruments, and discloses an oral cavity expansion support for the stomatology department, the oral cavity expansion support comprises a base, a headrest is fixedly mounted on the base, an upper module and a lower module are arranged above the headrest, and the upper and lower teeth of a patient can respectively occlude the upper module and the lower module; the lower module moves to drive the L-shaped grooved plate to move, the included angle between the L-shaped grooved plate and the strip-shaped grooved plate can be changed by a corresponding angle, then the locking assembly can lock the included angle between the strip-shaped grooved plate and the L-shaped grooved plate, and therefore it is guaranteed that the size of an opening is constant, and the requirements of different patients with jaw bone differences and different operations can be met; stepless adjustment of the opening size and angle of the oral cavity can be achieved, meanwhile, the jaw limiting plate limits movement of the jaw of a patient, accidental deviation of the lower jaw caused by movement of subtemporal joints is effectively prevented, and the stability of oral cavity expansion in the diagnosis and treatment process can be guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of oral auxiliary instruments, and in particular to an oral expansion bracket for stomatology. Background Art

[0002] The oral expansion stent used in dentistry, also known as an oral supporter or an opener, is an auxiliary tool that is mainly used to help the patient open his mouth during treatment to facilitate the doctor to perform oral examination, surgery or treatment.

[0003] Traditional mouth openers use a fixed-size block to allow the patient to bite in order to widen the distance between the teeth and open the mouth, but their applicable scenarios are limited. To solve this problem, an adjustable mouth opener has been developed, which uses two support plates to respectively abut the patient's upper and lower teeth, and adjusts the size of the opening by sliding or rotating the two support plates away from each other. However, this design still moves the support plates along a fixed trajectory, and fails to fully consider the requirements of different oral surgeries for opening angles and the differences in patients' jaws, resulting in limited applicability. To correct the deviation, the patient may take unnatural postures, such as tilting his head back, which not only increases the complexity of medical operations, but also increases the difficulty of cooperation for patients. Based on this, the present invention purposely provides an oral expansion stent for dentistry that can steplessly adjust the size and angle of the oral opening and has greater applicability. Summary of the invention

[0004] The purpose of the present invention is to provide an oral expansion stent for stomatology to solve the technical problems in the prior art in view of the shortcomings of the prior art.

[0005] The purpose of the present invention can be achieved through the following technical solutions: An oral expansion stent for stomatology, comprising: A base, on which a headrest is fixedly installed, an upper module and a lower module are arranged above the headrest for the patient's upper and lower teeth to bite respectively, the upper module is provided with two symmetrically arranged strip groove plates, and the lower module is provided with two symmetrically arranged L-shaped groove plates, the two strip groove plates are respectively matched with the two L-shaped groove plates, and a slider is slidably installed in each strip groove plate, the slider is slidably connected with the L-shaped groove plate, and the two sliders are respectively controlled by two locking components to rotate and open and close, when the locking component is in an unlocked state, the angle between the strip groove plate and the L-shaped groove plate is variable, and when the locking component is in a locked state, the angle between the strip groove plate and the L-shaped groove plate is constant; A chin stop plate, which is arranged above the headrest and is driven to move by the linkage assembly, and is used to limit the movement of the patient's lower jaw; When the upper module and the lower module are combined, the two can be inserted into the patient's mouth, with the upper module abutting the upper teeth and the lower module abutting the lower teeth. At this time, the groove on the strip grooved plate is perpendicular to the groove on the L-shaped grooved plate. The locking component is adjusted to the unlocked state, and the patient opens his mouth naturally. The lower module moves away from the upper module and the angle between the L-shaped grooved plate and the strip grooved plate gradually decreases. At this time, the slider slides in the strip grooved plate and the L-shaped grooved plate. When the patient's mouth expands to a suitable state, the locking component is adjusted to the locked state, and the chin limit plate is moved to the patient's chin through the linkage component.

[0006] As a further solution of the present invention: the locking assembly includes a fixed plate, a fixed block, an abutment block and a first screw, the fixed plate and the fixed block are respectively fixedly installed on both ends of the slider, the strip groove plate is in abutment with the side opposite to the L-shaped groove plate, the fixed plate is in abutment with the side of the L-shaped groove plate away from the strip groove plate, the fixed block is in abutment with the side of the strip groove plate away from the L-shaped groove plate, the abutment block is slidably installed on the fixed block, the first screw is rotatably installed in the slider, and it is threadedly connected with the abutment block, when the first screw is manually rotated so that the abutment block abuts against the strip groove plate, the locking assembly is in a locked state; when the abutment block is away from the strip groove plate, the locking assembly is in an unlocked state.

[0007] As a further solution of the present invention: two symmetrically arranged mobile brackets are slidably installed on the base, and an L-shaped plate is rotatably installed on each mobile bracket. Each L-shaped plate corresponds to a fixed plate, and the L-shaped plate and the fixed plate can be connected by a supporting assembly. The mobile bracket is driven to move by a driving source, and the L-shaped plate is driven to rotate by an output source.

[0008] As a further solution of the present invention: the supporting assembly includes a clamped block, a supporting block and a grooved clamping plate, the clamped block is fixedly mounted with a round rod, and the round rod is fixedly connected to the fixed plate, the supporting block is fixedly mounted on the L-shaped plate, the grooved clamping plate is slidably mounted in the supporting block, and the groove of the grooved clamping plate cooperates with the round rod, a second screw is rotatably mounted on the supporting block, and the second screw is threadedly connected to the grooved clamping plate.

[0009] As a further solution of the present invention: silicone rubber in contact with teeth is fixedly mounted on both the upper module and the lower module.

[0010] As a further solution of the present invention: a U-shaped groove is provided on the chin limiting plate, and the U-shaped groove fits the chin of the patient.

[0011] As a further solution of the present invention: the linkage assembly includes a driving assembly, a moving rod and a socket, the driving assembly drives the moving rod to move, the socket is fixedly installed on the moving rod, and the chin limit plate is hinged to the socket ball.

[0012] As a further solution of the present invention: extension plates are fixedly installed on the upper module and the lower module respectively, and the strip-shaped grooved plate and the L-shaped grooved plate are fixedly installed on the corresponding extension plates respectively, and both are far away from the patient's mouth.

[0013] Beneficial effects of the present invention: 1. In the present invention, the physiological rotation characteristics of the mandible are fully utilized. In the process of adjusting the size and angle of the patient's oral opening, the lower module will move along the movement trajectory of the patient's natural mouth opening, and the movement of the lower module will drive the L-shaped grooved plate to move, and the angle between the L-shaped grooved plate and the strip grooved plate will change the corresponding angle. Then the locking component can lock the angle between the strip grooved plate and the L-shaped grooved plate, thereby ensuring that the opening size remains constant. In this way, stepless adjustment of the size and angle of the oral opening can be achieved for different patients with jaw differences and different surgical requirements. At the same time, the chin limit plate is used to limit the movement of the patient's chin, effectively preventing the mandible from accidentally shifting due to the movement of the temporomandibular joint, and ensuring the stability of oral expansion during diagnosis and treatment. 2. In the present invention, the strip grooved plate and the L-shaped grooved plate are fitted on one side opposite to the strip grooved plate, which means that there is friction between the two. At this time, when the first screw is rotated to make the abutment block move away from the strip grooved plate, the angle between the strip grooved plate and the L-shaped grooved plate can be changed at will. When the first screw is rotated to make the abutment block abut against the strip grooved plate, the L-shaped grooved plate will abut against the strip grooved plate. The friction between the two will limit the movement of the strip grooved plate and the L-shaped grooved plate, thereby ensuring that the upper module and the lower module can stably expand the patient's oral cavity, and it is also convenient for medical staff to operate by only controlling the rotation direction of the first screw. 3. In the present invention, after the upper module and the lower module expand the patient's oral cavity, and then the abutment block abuts the strip groove plate to stabilize the overall bracket, the movable bracket can be moved by the driving source, and the position of the L-shaped plate can be adjusted by the output source, and then the fixed plate and the L-shaped plate can be clamped together by the supporting assembly. At this time, the position of the overall bracket can be limited, and the chin limit plate can be used to limit the patient's chin, so that the patient's entire head position can be limited on the headrest, ensuring that the oral position will not change during diagnosis and treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below in conjunction with the accompanying drawings.

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the opening structure of the lower module in the present invention; Figure 3 It is a schematic diagram of the structure of the lower module and the upper module in the present invention in the combined state; Figure 4 It is a schematic diagram of the structure of the lower module and the upper module in the expanded state of the present invention; Figure 5 It is a structural schematic diagram of the locking state of the locking component in the present invention; Figure 6 It is a structural schematic diagram of the unlocked state of the locking component in the present invention; Figure 7 It is a structural schematic diagram of the support block in the present invention; Figure 8 It is a schematic diagram of the cooperation between the grooved clamping plate and the clamped block in the present invention; Fig. 9 It is a schematic diagram of the structure of the chin limiting plate in the present invention; Fig.10 It is a schematic diagram of the structure of the silicone rubber in the present invention.

[0016] In the figure: 1. base; 2. headrest; 3. upper module; 4. strip grooved plate; 5. lower module; 6. L-shaped grooved plate; 7. slider; 8. locking assembly; 9. fixing plate; 10. fixing block; 11. abutment block; 12. first screw; 13. supporting assembly; 14. round rod; 15. clamped block; 16. supporting block; 17. grooved clamping plate; 18. second screw; 19. movable bracket; 20. L-shaped plate; 21. chin limit plate; 22. driving assembly; 23. movable rod; 24. socket; 25. extension plate; 26. silicone rubber; 27. base; 28. first connecting rod; 29. ​​second connecting rod. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See also Figure 1-Figure 10 As shown, the present invention is an oral expansion stent for stomatology, comprising: A base 1, on which a headrest 2 is fixedly installed, and an upper module 3 and a lower module 5 are arranged above the headrest 2 for the patient's upper and lower teeth to bite respectively, and the upper module 3 is provided with two symmetrically arranged strip groove plates 4, and the lower module 5 is provided with two symmetrically arranged L-shaped groove plates 6, and the two strip groove plates 4 are respectively matched with the two L-shaped groove plates 6, and a slider 7 is slidably installed in each strip groove plate 4, and the slider 7 is slidably connected with the L-shaped groove plate 6, and the two sliders 7 are respectively controlled by two locking components 8 to rotate and open and close, when the locking component 8 is in the unlocked state, the angle between the strip groove plate 4 and the L-shaped groove plate 6 is variable, and when the locking component 8 is in the locked state, the angle between the strip groove plate 4 and the L-shaped groove plate 6 is constant; A chin stop plate 21, which is disposed above the headrest 2 and is driven to move by a linkage assembly, and is used to limit the movement of the patient's lower jaw; When the upper module 3 and the lower module 5 are combined, the two can be inserted into the patient's mouth, the upper module 3 abuts the upper teeth, and the lower module 5 abuts the lower teeth. At this time, the groove on the strip groove plate 4 is perpendicular to the groove on the L-shaped groove plate 6, and the locking component 8 is adjusted to the unlocked state. The patient opens his mouth naturally, the lower module 5 moves away from the upper module 3, and the angle between the L-shaped groove plate 6 and the strip groove plate 4 gradually decreases. At this time, the slider 7 slides in the strip groove plate 4 and the L-shaped groove plate 6. When the patient's mouth expands to a suitable state, the locking component 8 is adjusted to the locked state, and the chin limit plate 21 is moved to the patient's chin through the linkage component.

[0019] The working principle of the present invention is as follows: First, the patient lies down with his head resting on the headrest 2, and then opens his mouth. Figure 1 As shown in the figure, this is the initial posture of the upper module 3 and the lower module 5. The upper module 3 and the lower module 5 are combined and inserted into the patient's mouth, and the upper module 3 is abutted against the patient's upper teeth. Then the locking component 8 is adjusted to the unlocked state. At this time, the patient opens his mouth naturally. Since the upper jaw basically does not move when opening the mouth, that is, the upper module 3 and the strip grooved plate 4 always maintain the initial position, and the lower jaw will rotate away from the upper jaw. At this time, the medical staff manually abuts the lower module 5 on the lower teeth, so that the lower module 5 moves along the movement trajectory of the patient's natural mouth opening, that is, the lower module 5 moves away from the upper module 3 to open the patient's mouth. In this case, according to the needs of the operation, the medical staff can manually assist in adjusting the patient's oral opening to a suitable size and angle. During the adjustment process, the movement of the lower module 5 will cause the L-shaped grooved plate 6 to drive the slider 7 to move, and the slider 7 will gradually move upward in the strip grooved plate 4, that is, the junction of the strip grooved plate 4 and the L-shaped grooved plate 6 will gradually move upward. Figure 2 As shown in the example, when the patient's oral cavity is expanded to a suitable state, the locking assembly 8 is adjusted to a locked state, at which time the angle between the strip groove plate 4 and the L-shaped groove plate 6 is constant, as shown in FIG. Figure 4As shown in the figure as an example, at this time, the upper module 3 and the lower module 5 resist the patient's bite force, thereby ensuring that the oral cavity is in an expanded state, and then the chin limit plate 21 is moved to the patient's chin through the linkage component, thereby limiting the movement of the patient's chin, that is, avoiding the patient's mandible from moving due to the movement of the infratemporal joint during diagnosis and treatment. The device makes full use of the physiological rotation characteristics of the mandible. During the adjustment of the size and angle of the patient's oral opening, the lower module 5 will move along the patient's natural mouth opening movement trajectory, and the movement of the lower module 5 will drive the L-shaped grooved plate 6 to move, and the angle between the L-shaped grooved plate 6 and the strip grooved plate 4 will change the corresponding angle, and then the locking component 8 can lock the angle between the strip grooved plate 4 and the L-shaped grooved plate 6, thereby ensuring that the opening size remains constant, so that different patients with jaw differences and different surgical requirements can achieve stepless adjustment of the size and angle of the oral opening, and at the same time, the chin limit plate 21 limits the movement of the patient's chin, effectively preventing the mandible from accidentally shifting due to the movement of the infratemporal joint, and ensuring the stability of the oral expansion during diagnosis and treatment.

[0020] like Figure 5-Figure 6 As shown, as a preferred embodiment of the present invention, the locking assembly 8 includes a fixing plate 9, a fixing block 10, an abutment block 11 and a first screw 12, the fixing plate 9 and the fixing block 10 are fixedly installed on both ends of the slider 7 respectively, the strip groove plate 4 is in contact with the side opposite to the L-shaped groove plate 6, the fixing plate 9 is in contact with the side of the L-shaped groove plate 6 away from the strip groove plate 4, the fixing block 10 is in contact with the side of the strip groove plate 4 away from the L-shaped groove plate 6, the abutment block 11 is slidably installed on the fixing block 10, the first screw 12 is rotatably installed in the slider 7, and it is threadedly connected with the abutment block 11, when the first screw 12 is manually rotated so that the abutment block 11 abuts against the strip groove plate 4, the locking assembly 8 is in a locked state; when the abutment block 11 is away from the strip groove plate 4, the locking assembly 8 is in an unlocked state.

[0021] When this embodiment is actually applied, first, the strip grooved plate 4 is fitted with the opposite side of the L-shaped grooved plate 6, which means that there is friction between the two, and the fixing plate 9 is fitted on the side of the L-shaped grooved plate 6 away from the strip grooved plate 4, and the fixing block 10 is fitted on the side of the strip grooved plate 4 away from the L-shaped grooved plate 6. At this time, when the first screw 12 is rotated to make the abutment block 11 away from the strip grooved plate 4, the angle between the strip grooved plate 4 and the L-shaped grooved plate 6 can be changed at will, and when the first screw 12 is rotated to make the abutment block 11 abut against the strip grooved plate 4, the L-shaped grooved plate 6 will abut against the strip grooved plate 4, and the friction between the two will limit the movement of the strip grooved plate 4 and the L-shaped grooved plate 6, thereby ensuring that the upper module 3 and the lower module 5 can stably expand the patient's oral cavity, and it is also convenient for medical staff to operate by only controlling the rotation direction of the first screw 12.

[0022] like Figure 1-Figure 2 As shown, as a preferred embodiment of the present invention, two symmetrically arranged movable brackets 19 are slidably mounted on the base 1, and an L-shaped plate 20 is rotatably mounted on each movable bracket 19, each L-shaped plate 20 corresponds to a fixed plate 9, and the L-shaped plate 20 and the fixed plate 9 can be clamped together by a supporting assembly 13, the movable bracket 19 is driven to move by a driving source, and the L-shaped plate 20 is driven to rotate by an output source.

[0023] In one case of this embodiment, the driving source can be selected from components such as reciprocating cylinders, electric telescopic rods, and other mechanisms that can achieve linear reciprocating motion. The output source can be selected from components such as servo motors, servo motors, and other mechanisms that can achieve rotational motion. This embodiment does not make specific limitations here.

[0024] In actual application of this embodiment, after the upper module 3 and the lower module 5 expand the patient's mouth, and then the abutment block 11 abuts the strip grooved plate 4 to stabilize the overall bracket, the movable bracket 19 can be moved by the driving source, and the position of the L-shaped plate 20 can be adjusted by the output source, and then the fixed plate 9 and the L-shaped plate 20 are clamped together by the support assembly 13. At this time, the position of the overall bracket can be limited, and the chin limit plate 21 can be used to limit the patient's chin, so that the patient's entire head position can be limited on the headrest 2, ensuring that the oral position will not change during diagnosis and treatment.

[0025] like Figure 7-Figure 8 As shown, as a preferred embodiment of the present invention, the supporting assembly 13 includes a clamped block 15, a supporting block 16 and a grooved clamping plate 17, the clamped block 15 is fixedly mounted with a round rod 14, and the round rod 14 is fixedly connected to the fixing plate 9, the supporting block 16 is fixedly mounted on the L-shaped plate 20, the grooved clamping plate 17 is slidably mounted in the supporting block 16, and the groove of the grooved clamping plate 17 cooperates with the round rod 14, and a second screw 18 is rotatably mounted on the supporting block 16, and the second screw 18 is threadedly connected to the grooved clamping plate 17.

[0026] When this embodiment is actually used, the support block 16 is inserted into the clamped block 15 so that the groove on the grooved clamping plate 17 is inserted into the round rod 14. Then, the second screw 18 is rotated to drive the grooved clamping plate 17 to move so that the grooved clamping plate 17 abuts against the clamped block 15, and the clamped block 15 abuts against the inner wall of the support block 16, thereby completing the clamping connection between the support block 16 and the clamped block 15, thereby achieving the fixation of the position of the fixing plate 9, thereby determining the position of the two sliders 7, and limiting the spatial position of the L-shaped grooved plate 6 and the strip grooved plate 4 by fixing the position of the slider 7, so that the patient's head biting on the upper module 3 and the lower module 5 cannot move, thereby ensuring the stability of the patient's oral opening during diagnosis and treatment.

[0027] like Fig.10 As shown, as a preferred embodiment of the present invention, the upper module 3 and the lower module 5 are both fixedly mounted with silicone rubber 26 that contacts the teeth.

[0028] In actual application of this embodiment, the silicone rubber 26 is used as a commonly used oral medical product. When the patient bites on the silicone rubber 26, the silicone rubber 26 will deform and wrap the patient's teeth and gums, which can play a protective role and ensure that the position of the teeth biting on the upper module 3 and the lower module 5 will not move.

[0029] like Fig. 9 As shown, as a preferred embodiment of the present invention, a U-shaped groove is provided on the chin limiting plate 21, and the U-shaped groove fits the chin of the patient.

[0030] In practical application, if Fig. 9 As shown in the example, the U-shaped groove on the chin limiting plate 21 can better fit the patient's chin, thereby limiting the patient's lower jaw in four directions: up, down, left and right.

[0031] like Figure 1-Figure 2 As shown, as a preferred embodiment of the present invention, the linkage assembly includes a driving assembly 22, a moving rod 23 and a socket 24, the driving assembly 22 drives the moving rod 23 to move, the socket 24 is fixedly mounted on the moving rod 23, and the chin limit plate 21 is ball-jointed with the socket 24.

[0032] In one case of the present embodiment, the driving assembly 22 includes a base 27, a first connecting rod 28 and a second connecting rod 29, the two ends of the first connecting rod 28 are rotatably connected to the base 27 and the second connecting rod 29 respectively, a first motor for driving the first connecting rod 28 to rotate is fixedly mounted on the base 27, a second motor for driving the second connecting rod 29 to rotate is fixedly mounted on the first connecting rod 28, and the second connecting rod 29 is fixedly connected to the moving rod 23.

[0033] In actual application of this embodiment, the driving component 22 can drive the moving rod 23 to move, and then the chin limit plate 21 is attached to the patient's chin, and the driving component 22 continues to drive the moving rod 23 to move, so as to apply force to the patient's chin. Through the ball joint between the chin limit plate 21 and the socket 24, the chin limit plate 21 can rotate on the moving rod 23, so that the patient's chin can be adjusted to a relatively comfortable position to restrict movement, thereby avoiding strong discomfort caused by the restricted movement of the patient's chin.

[0034] like Figure 1-Figure 4 As shown, as a preferred embodiment of the present invention, the upper module 3 and the lower module 5 are respectively fixedly mounted with extension plates 25, and the strip grooved plate 4 and the L-shaped grooved plate 6 are respectively fixedly mounted on the corresponding extension plates 25, and both are away from the patient's mouth.

[0035] In actual application of this embodiment, by extending the extension plate 25, the strip grooved plate 4 and the L-shaped grooved plate 6 can be located outside the patient's mouth. On the one hand, this can avoid blocking the patient's mouth. On the other hand, when the strip grooved plate 4 and the L-shaped grooved plate 6 are in the patient's mouth, when the angle between the strip grooved plate 4 and the L-shaped grooved plate 6 changes, the risk of causing damage to the patient's gums and lips can be avoided.

[0036] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. An oral expansion stent for stomatology, characterized in that: include: A base (1) is fixedly mounted with a headrest (2), an upper module (3) and a lower module (5) for the patient's upper and lower teeth to bite respectively are arranged above the headrest (2), the upper module (3) is provided with two symmetrically arranged strip groove plates (4), the lower module (5) is provided with two symmetrically arranged L-shaped groove plates (6), the two strip groove plates (4) are respectively matched with the two L-shaped groove plates (6), and a slider (7) is slidably mounted in each strip groove plate (4), the slider (7) is slidably connected with the L-shaped groove plate (6), the two sliders (7) are respectively controlled by two locking components (8) to rotate and open and close, when the locking component (8) is in an unlocked state, the angle between the strip groove plate (4) and the L-shaped groove plate (6) is variable, and when the locking component (8) is in a locked state, the angle between the strip groove plate (4) and the L-shaped groove plate (6) is constant; A chin stop plate (21), which is arranged above the headrest (2) and is driven to move by the linkage assembly, and the chin stop plate (21) is used to limit the movement of the patient's lower jaw; When the upper module (3) and the lower module (5) are combined, the two can be inserted into the patient's oral cavity, the upper module (3) abuts against the upper teeth, and the lower module (5) abuts against the lower teeth. At this time, the groove on the strip groove plate (4) is perpendicular to the groove on the L-shaped groove plate (6). The locking component (8) is adjusted to the unlocked state, and the patient opens his mouth naturally. The lower module (5) moves away from the upper module (3) and the angle between the L-shaped groove plate (6) and the strip groove plate (4) gradually decreases. At this time, the slider (7) slides in the strip groove plate (4) and the L-shaped groove plate (6). When the patient's oral cavity expands to a suitable state, the locking component (8) is adjusted to the locked state, and the chin limit plate (21) is moved to the patient's chin through the linkage component.

2. The oral expansion stent for stomatology according to claim 1, characterized in that: The locking assembly (8) comprises a fixing plate (9), a fixing block (10), an abutting block (11) and a first screw rod (12); the fixing plate (9) and the fixing block (10) are respectively fixedly mounted on two ends of the slider (7); the strip groove plate (4) is in contact with a side opposite to the L-shaped groove plate (6); the fixing plate (9) is in contact with a side of the L-shaped groove plate (6) away from the strip groove plate (4); the fixing block (10) is in contact with a side of the strip groove plate (4) away from the L-shaped groove plate (6); The first screw rod (12) is rotatably mounted in the slider (7) and is threadably connected to the abutment block (11). When the first screw rod (12) is manually rotated so that the abutment block (11) abuts against the strip groove plate (4), the locking assembly (8) is in a locked state; when the abutment block (11) is away from the strip groove plate (4), the locking assembly (8) is in an unlocked state.

3. The oral cavity expansion stent for stomatology according to claim 1, characterized in that: Two symmetrically arranged movable brackets (19) are slidably mounted on the base (1); an L-shaped plate (20) is rotatably mounted on each movable bracket (19); each L-shaped plate (20) corresponds to a fixed plate (9); the L-shaped plate (20) and the fixed plate (9) can be clamped together via a support assembly (13); the movable bracket (19) is driven to move by a driving source; and the L-shaped plate (20) is driven to rotate by an output source.

4. The oral cavity expansion stent for stomatology according to claim 3, characterized in that: The support assembly (13) comprises a clamped block (15), a support block (16) and a grooved clamping plate (17); a round rod (14) is fixedly mounted on the clamped block (15), and the round rod (14) is fixedly connected to the fixed plate (9); the support block (16) is fixedly mounted on the L-shaped plate (20); the grooved clamping plate (17) is slidably mounted in the support block (16), and the groove of the grooved clamping plate (17) cooperates with the round rod (14); a second screw rod (18) is rotatably mounted on the support block (16), and the second screw rod (18) is threadedly connected to the grooved clamping plate (17).

5. The oral cavity expansion stent for stomatology according to claim 1, characterized in that: Silicon rubber (26) in contact with teeth is fixedly mounted on both the upper module (3) and the lower module (5).

6. The oral cavity expansion stent for stomatology according to claim 1, characterized in that: The chin limiting plate (21) is provided with a U-shaped groove, and the U-shaped groove fits the chin of the patient.

7. The oral cavity expansion stent for stomatology according to claim 1, characterized in that: The linkage assembly comprises a driving assembly (22), a moving rod (23) and a socket (24); the driving assembly (22) drives the moving rod (23) to move; the socket (24) is fixedly mounted on the moving rod (23); and the chin stop plate (21) is ball-jointed with the socket (24).

8. The oral cavity expansion stent for stomatology according to claim 1, characterized in that: The upper module (3) and the lower module (5) are respectively fixedly mounted with extension plates (25); the strip-shaped grooved plate (4) and the L-shaped grooved plate (6) are respectively fixedly mounted on the corresponding extension plates (25), and both are away from the patient's oral cavity.

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