Mouth opening support for department of stomatology

Abstract

The invention relates to the technical field of medical auxiliary instruments, and provides a mouth opening support for the stomatology department, the mouth opening support comprises two mouth opening mechanisms, the two mouth opening mechanisms are arranged in a mirror image mode, and each mouth opening mechanism comprises a tongue depressor; the mouth opening wheel is fixedly connected with the tongue depressor, and an annular clamping groove is formed in the mouth opening wheel; the rotating assembly comprises a bottom plate and a movable rod, the bottom plate is fixedly installed at the top of the tongue depressor, the first end of the movable rod is rotationally connected with the bottom plate, a fixed plate is fixedly installed at the second end of the movable rod, and an upper limiting hole and a lower limiting hole are formed in the fixed plate; the locking assembly is used for preventing relative rotation between the movable rod and the bottom plate; the supporting assembly comprises a movable plate, a limiting screw and a supporting wheel, the movable plate is rotationally connected with the fixed plate, the threaded end of the limiting screw penetrates through the movable plate and then is in threaded fit with the upper limiting hole or the lower limiting hole, the supporting wheel is fixedly connected with the movable plate, and an annular supporting groove is formed in the supporting wheel.

Description

Technical Field

[0001] The present invention relates to the technical field of medical auxiliary devices, and particularly relates to an oral cavity opening stent for stomatology. Background Art

[0002] Tooth decay is one of the most common oral diseases, and its harms include pain, tooth damage, pulpitis, periapical periodontitis, and oral infections, etc. At present, root canal treatment is a relatively effective means for treating tooth decay. During the process of root canal treatment, it is often necessary for the patient's oral cavity to remain open for a long time, which causes the muscles on the patient's face to be easily fatigued due to the long-term opening of the oral cavity, making it difficult to persist in long-term treatment and care, and appropriate rest must be taken.

[0003] To solve this problem, mouth openers have been invented. Common mouth openers are as follows Figure 1 As shown, it is a circular ring structure with a circular groove. During root canal treatment, the teeth on one side of the patient bite into the circular groove, so that the patient's oral cavity remains open, and the doctor can then treat the teeth on the other side of the patient. However, this kind of mouth opener can only support the patient's oral cavity unilaterally, with poor stability, and will cause discomfort to the patient after long-term use.

[0004] Chinese invention patents with publication numbers CN221786208U, CN219423019U, and CN219397189U have all disclosed oral cavity opening stents, but these oral cavity opening stents will all come into direct contact with the patient's teeth or block all of the patient's teeth, resulting in the doctor being unable to perform root canal treatment operations on the patient's tooth decay.

[0005] In summary, designing an oral cavity opening stent that can stably support the patient's oral cavity and does not affect the doctor's operation is an urgent problem to be solved in this field. Summary of the Invention

[0006] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide an oral cavity opening stent for stomatology, which can stably support the patient's oral cavity and does not affect the doctor's operation.

[0007] To achieve the above purpose, the present invention is realized through the following technical solutions: An oral cavity opening stent for stomatology includes two opening mechanisms, and the two opening mechanisms are mirror-symmetrically arranged. The opening mechanism includes: A tongue depressor; An opening wheel, which is arranged on the first side of the tongue depressor and fixedly connected to the tongue depressor. An annular card slot is opened on the outer peripheral surface of the opening wheel; Rotating assembly, the rotating assembly includes a bottom plate and a movable rod, the bottom plate is fixedly installed on the top of the tongue depressor, the first end of the movable rod is rotatably connected to the bottom plate, a fixing plate is fixedly installed on the second end of the movable rod, and an upper limit hole and a lower limit hole are respectively formed on the fixing plate; Locking assembly, the locking assembly is used to prevent relative rotation between the movable rod and the bottom plate; Support assembly, the support assembly includes a movable plate, a limit screw and a support wheel, the movable plate is arranged on the fixing plate and is rotatably connected to the fixing plate, the limit screw is arranged on the movable plate, the threaded end of the limit screw passes through the movable plate and is in threaded cooperation with the upper limit hole or the lower limit hole, the support wheel is arranged on the movable plate and is fixedly connected to the movable plate, and an annular support groove is formed on the outer peripheral surface of the support wheel.

[0008] Further, the locking assembly includes a locking plate and a locking rod, the locking plate is fixedly installed on the bottom plate, a locking hole is formed on the locking plate, the first end of the locking rod is rotatably connected to the second end of the movable rod, a locking screw is arranged on the second end of the locking rod, the threaded end of the locking screw passes through the locking rod and is in threaded cooperation with the locking hole, and a triangular structure is formed among the locking rod, the movable rod and the bottom plate.

[0009] Further, a U-shaped groove is formed at the bottom of the tongue depressor.

[0010] Further, a notch is formed on the second side of the tongue depressor, and a guiding hole is formed on the inner wall of the notch.

[0011] Further, an activity assembly is further included, the activity assembly includes an activity block, a guiding rod, a driving plate, a transmission rod, a transmission shaft and a spring, the activity block is arranged at the notch, an L-shaped groove is formed at the bottom of the activity block, the L-shaped groove is communicated with the U-shaped groove, the first end of the guiding rod is fixedly connected to the activity block, the second end of the guiding rod is in sliding contact with the inner wall of the guiding hole, the driving plate is fixedly installed on the movable plate, the transmission rod is fixedly installed on the movable rod, a kidney-shaped groove is formed on the transmission rod, the transmission shaft is arranged on the driving plate and is in threaded connection with the driving plate, the transmission shaft is in sliding contact with the inner wall of the kidney-shaped groove, and the spring makes the activity block have a tendency to move outwards; When the second end of the movable rod moves upwards, the transmission rod makes the transmission shaft have a tendency to move inwards.

[0012] Further, a torsion spring is further included, and the torsion spring makes the second end of the movable rod have a tendency to swing downwards.

[0013] Further, a connecting pipe is fixedly installed on the outer side surface of the tongue depressor. A plurality of first water absorption holes are formed on the outer side surface of the tongue depressor. The plurality of first water absorption holes are arranged at intervals along the circumferential direction of the tongue depressor. A first arc-shaped groove is formed inside the tongue depressor. The first arc-shaped groove is communicated with the connecting pipe and the plurality of first water absorption holes. Further, a plurality of second water absorption holes are formed on the outer side surface of the movable block. The plurality of second water absorption holes are arranged at intervals along the circumferential direction of the movable block. A second arc-shaped groove is formed inside the movable block. The second arc-shaped groove is communicated with the plurality of second water absorption holes. The second arc-shaped groove is communicated with the first arc-shaped groove through a hose.

[0014] Advantages of the present invention: The oral cavity opening bracket for stomatology provided by the present invention, on the one hand, the opening wheel can form upper and lower two-point supports on one side of the patient's oral cavity, and the support wheel can form a single-point support on the other side of the patient's oral cavity. Therefore, through the above three-point supports, a stable support can be formed for the patient's oral cavity. And at this time, the treatment area of the patient's oral cavity is not blocked at all and is in an exposed state. Therefore, it will not affect the doctor's operation. Description of the Drawings

[0015] Figure 1 is the front view structural schematic diagram of the present invention; Figure 2 is the front view structural schematic diagram of the opening mechanism; Figure 3 is the three-dimensional structural schematic diagram of the opening mechanism from the first perspective; Figure 4 is the three-dimensional structural schematic diagram of the opening mechanism from the second perspective; Figure 5 is the three-dimensional structural schematic diagram of the opening mechanism from the third perspective; Figure 6 is the side view structural schematic diagram of the opening mechanism; Figure 7 is the top view structural schematic diagram of the opening mechanism; Figure 8 is the partial structural schematic diagram of the present invention; Figure 9 is the three-dimensional structural schematic diagram of the movable block.

[0016] Reference numerals: 10 - Mouth-opening mechanism, 20 - Tongue depressor, 21 - U-shaped groove, 22 - Notch, 23 - Connecting pipe, 24 - First water absorption hole, 25 - Hose, 30 - Mouth-opening wheel, 31 - Connecting plate, 32 - Annular clamping groove, 40 - Rotating assembly, 41 - Bottom plate, 42 - Movable rod, 43 - First rotating shaft, 44 - Fixed plate, 45 - Upper limit hole, 46 - Lower limit hole, 50 - Locking assembly, 51 - Locking plate, 52 - Locking rod, 53 - Locking hole, 54 - Locking screw, 60 - Support assembly, 61 - Movable plate, 62 - Limit screw, 63 - Support wheel, 64 - Second rotating shaft, 65 - Annular support groove, 70 - Movable assembly, 71 - Movable block, 72 - Guide rod, 73 - Driving plate, 74 - Transmission rod, 75 - Transmission shaft, 76 - Spring, 77 - Kidney-shaped groove, 78 - Second water absorption hole, 79 - L-shaped groove, 80 - Torsion spring. Detailed implementation manners

[0017] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners.

[0018] In this application, unless otherwise clearly specified and defined, the terms "connection" and "fixation" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0019] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "horizontal", "top", "bottom", "upper", "lower", "inner" and "outer" etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0020] In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. In the description of the present invention, "a plurality of" means more than two, unless otherwise clearly specifically defined.

[0021] As Figures 1-9 shown, the present invention provides a mouth-opening bracket for stomatology, which includes two mouth-opening mechanisms 10. The two mouth-opening mechanisms 10 are mirror-image arranged. The mouth-opening mechanism 10 includes a tongue depressor 20, a mouth-opening wheel 30, a rotating assembly 40, a locking assembly 50 and a support assembly 60.

[0022] The tongue depressor 20 has a U-shaped structure to better adapt to the shape of the human tongue.

[0023] The mouth-opening wheel 30 is arranged on the first side of the tongue depressor 20 and is fixedly connected to the tongue depressor 20 through a connecting plate 31. An annular clamping groove 32 extending inward is formed on the outer peripheral surface of the mouth-opening wheel 30.

[0024] The rotating assembly 40 includes a bottom plate 41 and a movable rod 42. The bottom plate 41 is fixedly installed on the top of the tongue depressor 20. The first end of the movable rod 42 is rotatably connected to the bottom plate 41 through a first rotating shaft 43. A fixing plate 44 is fixedly installed on the second end of the movable rod 42. An upper limiting hole 45 and a lower limiting hole 46 are respectively formed on the fixing plate 44.

[0025] The locking assembly 50 is used to prevent relative rotation between the movable rod 42 and the bottom plate 41.

[0026] The supporting assembly 60 includes a movable plate 61, a limiting screw 62 and a supporting wheel 63. The movable plate 61 is arranged on the fixing plate 44 and is rotatably connected to the fixing plate 44 through a second rotating shaft 64. The second rotating shaft 64 is located between the upper limiting hole 45 and the lower limiting hole 46. The limiting screw 62 is arranged on the movable plate 61. The threaded end of the limiting screw 62 passes through the movable plate 61 and is in threaded cooperation with the upper limiting hole 45 or the lower limiting hole 46. The supporting wheel 63 is arranged on the movable plate 61 and is fixedly connected to the movable plate 61. An annular supporting groove 65 extending inward is formed on the outer peripheral surface of the supporting wheel 63.

[0027] It should be noted that: The present invention is composed of two mirror-image mouth-opening mechanisms 10. In actual use, according to the specific situation of the root canal treatment of the patient, the doctor needs to use the two mirror-image mouth-opening mechanisms 10 separately and successively, or only needs to use one suitable mouth-opening mechanism 10. Since in the present invention, the two mouth-opening mechanisms 10 are mirror-image settings and have exactly the same structure, the working process of only one mouth-opening mechanism 10 will be introduced below.

[0028] In the initial state of the present invention, the threaded end of the limiting screw 62 passes through the movable plate 61 and is in threaded cooperation with the upper limiting hole 45. At this time, the locking assembly 50 is not working, and the movable rod 42 is in contact with the bottom plate 41.

[0029] When root canal treatment is needed for the lower right teeth of a patient (the orientation in this text is based on the doctor's perspective, the same below), the doctor first pulls the second end of the movable rod 42 upward until the upper part of the annular support groove 65 is aligned with the upper part of the annular clamping groove 32. Then the doctor controls the locking assembly 50 to start, and at this time the movable rod 42 is fixed to the bottom plate 41, and there is no relative rotation between the two. Finally, the patient opens the mouth, and the doctor puts the present invention into the patient's mouth, allowing the upper and lower left teeth of the patient to bite the upper and lower parts of the annular clamping groove 32 respectively, and the upper right teeth of the patient to bite the upper part of the annular support groove 65. At this time, the lower right teeth of the patient are in an exposed state, thus facilitating the doctor to perform root canal treatment on the lower right of the patient. At the same time, the tongue depressor 20 presses the patient's tongue to prevent the patient's tongue from shaking randomly and affecting the doctor's operation during subsequent root canal treatment, and also to prevent the doctor from accidentally injuring the patient's tongue when operating medical devices.

[0030] When root canal treatment is needed for the upper right teeth of a patient, the doctor first removes the limit screw 62, rotates the movable plate 61, and then threadedly mates the threaded end of the limit screw 62 with the lower limit hole 46. The subsequent steps are basically the same as the above steps and will not be elaborated here (only at this time, the lower right teeth of the patient bite the lower part of the annular support groove 65, and the upper right teeth of the patient are in an exposed state, thus facilitating the doctor to perform root canal treatment on the upper right of the patient).

[0031] When root canal treatment is needed for the lower left teeth and upper left teeth of a patient, another mirror-symmetrical mouth-opening mechanism 10 can be used, and the usage process is exactly the same as the above process and will not be elaborated here.

[0032] During the use of the present invention, on the one hand, the opening wheel 30 can form upper and lower two-point supports on one side of the patient's mouth, and the support wheel 63 can form a single-point support on the other side of the patient's mouth. Therefore, through the above three-point supports, a stable support can be formed for the patient's mouth, and at this time, the treatment area of the patient's mouth is not blocked at all and is in an exposed state, so it will not affect the doctor's operation. At the same time, the tongue depressor 20 can also press the patient's tongue to prevent the patient's tongue from shaking randomly and affecting the doctor's operation during subsequent root canal treatment, and also to prevent the doctor from accidentally injuring the patient's tongue when operating medical devices, with higher safety.

[0033] In one embodiment, the locking assembly 50 includes a locking plate 51 and a locking rod 52. The locking plate 51 is fixedly installed on the bottom plate 41, and a locking hole 53 is formed in the locking plate 51. The first end of the locking rod 52 is rotatably connected to the second end of the movable rod 42, and a locking screw 54 is provided at the second end of the locking rod 52. The threaded end of the locking screw 54 passes through the locking rod 52 and is in threaded engagement with the locking hole 53. A triangular structure is formed among the locking rod 52, the movable rod 42, and the bottom plate 41.

[0034] In the initial state of the present invention, the threaded end of the locking screw 54 is not in threaded engagement with the locking hole 53.

[0035] When the locking assembly 50 is activated, the doctor only needs to pass the threaded end of the locking screw 54 through the locking rod 52 and then thread it into the locking hole 53. At this time, a stable triangular structure will be formed among the locking rod 52, the movable rod 42, and the bottom plate 41. At this time, the movable rod 42 is fixed to the bottom plate 41, and there will be no relative rotation between the two. Whether the upper row of teeth on the right side of the patient bites the upper part of the annular support groove 65 or the lower row of teeth on the right side of the patient bites the lower part of the annular support groove 65, the movable rod 42 will no longer swing, thereby ensuring that the present invention can form a three-point stable support for the patient's oral cavity and has better reliability.

[0036] In one embodiment, a U-shaped groove 21 is formed at the bottom of the tongue depressor 20. When the present invention is in use, the patient's tongue is located in the U-shaped groove 21 to improve the comfort of the patient.

[0037] In one embodiment, a notch 22 extending inward is formed on the second side of the tongue depressor 20, and a guiding hole extending inward is formed on the inner wall of the notch 22.

[0038] In this embodiment, the present invention further includes a movable component 70, and the movable component 70 includes a movable block 71, a guide rod 72, a driving plate 73, a transmission rod 74, a transmission shaft 75, and a spring 76. The movable block 71 is disposed at the notch 22. An L-shaped groove 79 is formed at the bottom of the movable block 71, and the L-shaped groove 79 communicates with the U-shaped groove 21. The L-shaped groove 79 and the U-shaped groove 21 together are used to accommodate the patient's tongue. The guide rod 72 is arranged horizontally, the first end of the guide rod 72 is fixedly connected to the movable block 71, and the second end of the guide rod 72 is in sliding contact with the inner wall of the guide hole. The driving plate 73 is fixedly installed on the movable plate 61. The transmission rod 74 is fixedly installed on the movable rod 42, and a waist-shaped groove 77 penetrating horizontally is formed in the transmission rod 74. The transmission shaft 75 is disposed on the driving plate 73 and is threadedly connected to the driving plate 73. The transmission shaft 75 is in sliding contact with the inner wall of the waist-shaped groove 77, and the transmission shaft 75 is adapted to the waist-shaped groove 77. The spring 76 is sleeved on the guide rod 72. The first end of the spring 76 is fixedly connected to the inner wall of the notch 22, and the second end of the spring 76 is fixedly connected to the movable block 71. The spring 76 causes the movable block 71 to have a tendency to move outward.

[0039] When the second end of the movable rod 42 moves upward, the transmission rod 74 causes the transmission shaft 75 to have a tendency to move inward.

[0040] In the initial state of the present invention, the transmission shaft 75 is not threadedly connected to the driving plate 73, and the spring 76 is in a natural elongation state. At this time, a complete U-shaped structure is formed between the movable block 71 and the tongue depressor 20 for pressing the patient's tongue.

[0041] When performing root canal treatment on the patient's right lower row of teeth, the doctor first passes the transmission shaft 75 through the waist-shaped groove 77 and then threadedly connects it to the driving plate 73. Then, during the process of pulling the second end of the movable rod 42 upward, due to the action of the transmission shaft 75 and the waist-shaped groove 77, the transmission rod 74 will push the transmission shaft 75 inward, and the driving plate 73 will drive the movable block 71 to move inward. The movable block 71 will drive the patient's right tongue to move inward, thereby separating the patient's tongue from the right lower row of teeth. The separated space can better facilitate the doctor to observe the condition of the patient's right lower row of teeth and further facilitate the doctor's operation.

[0042] When performing root canal treatment on the patient's right upper row of teeth, the doctor can directly operate according to the original steps without threadedly connecting the transmission shaft 75 to the driving plate 73, because the patient's tongue has been pressed by the tongue depressor 20 and the movable block 71 and will no longer contact the patient's right upper row of teeth. The doctor can observe the condition of the patient's right upper row of teeth well, and this can also improve the comfort of the patient's tongue.

[0043] In one embodiment, it further includes a torsion spring 80. The torsion spring 80 is sleeved on the first rotating shaft 43. The first end of the torsion spring 80 is fixedly connected to the bottom plate 41, and the second end of the torsion spring 80 is fixedly connected to the movable rod 42. The torsion spring 80 causes the second end of the movable rod 42 to have a tendency to swing downward.

[0044] The design of the torsion spring 80 enables the movable rod 42 to automatically adhere to the bottom plate 41 in the initial state of the present invention, preventing scattering.

[0045] In one embodiment, a connecting pipe 23 is fixedly installed on the outer side surface of the tongue depressor 20. A plurality of first water absorption holes 24 are formed on the outer side surface of the tongue depressor 20, and the plurality of first water absorption holes 24 are arranged at intervals along the circumferential direction of the tongue depressor 20. A first arc-shaped groove is formed inside the tongue depressor 20, and the first arc-shaped groove is communicated with both the connecting pipe 23 and the plurality of first water absorption holes 24.

[0046] In this embodiment, a plurality of second water absorption holes 78 are formed on the outer side surface of the movable block 71, and the plurality of second water absorption holes 78 are arranged at intervals along the circumferential direction of the movable block 71. A second arc-shaped groove is formed inside the movable block 71, and the second arc-shaped groove is communicated with the plurality of second water absorption holes 78. The second arc-shaped groove is communicated with the first arc-shaped groove through a hose 25.

[0047] Since the patient's oral cavity will gradually accumulate saliva when it is in an open state for a long time, if this saliva directly flows into the patient's throat, it is easy to choke the patient and cause serious discomfort to the patient. Therefore, it is necessary to regularly suck away the saliva in the patient's oral cavity.

[0048] During the use of the present invention, the doctor can regularly insert the negative pressure pipe into the connecting pipe 23, and negative pressure will be formed at the plurality of first water absorption holes 24 and the plurality of second water absorption holes 78, thereby sucking away the saliva in the patient's oral cavity. The patient can also raise his hand to signal the doctor to suck away the saliva in the oral cavity in time. The negative pressure pipe is a prior art, and its specific structure will not be described in detail here.

[0049] The above shows and describes the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to embrace all changes falling within the meaning and scope of the equivalent elements of the claims in the present invention.

[0050] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only includes an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An oral cavity opening stent for stomatology, characterized in that: It includes two opening mechanisms, and the two opening mechanisms are arranged mirror-symmetrically. The opening mechanism includes: A tongue depressor; An opening wheel, which is arranged on the first side of the tongue depressor and fixedly connected to the tongue depressor. An annular groove is formed on the outer peripheral surface of the opening wheel; A rotating assembly, which includes a bottom plate and a movable rod. The bottom plate is fixedly installed on the top of the tongue depressor. The first end of the movable rod is rotatably connected to the bottom plate. A fixed plate is fixedly installed at the second end of the movable rod. An upper limit hole and a lower limit hole are respectively formed on the fixed plate; A locking assembly, which is used to prevent relative rotation between the movable rod and the bottom plate; A support assembly, which includes a movable plate, a limit screw and a support wheel. The movable plate is arranged on the fixed plate and rotatably connected to the fixed plate. The limit screw is arranged on the movable plate. The threaded end of the limit screw passes through the movable plate and is in threaded cooperation with the upper limit hole or the lower limit hole. The support wheel is arranged on the movable plate and fixedly connected to the movable plate. An annular support groove is formed on the outer peripheral surface of the support wheel.

2. The oral cavity opening stent according to claim 1, wherein: The locking assembly includes a locking plate and a locking rod. The locking plate is fixedly installed on the bottom plate. A locking hole is formed on the locking plate. The first end of the locking rod is rotatably connected to the second end of the movable rod. A locking screw is arranged at the second end of the locking rod. The threaded end of the locking screw passes through the locking rod and is in threaded cooperation with the locking hole. A triangular structure is formed among the locking rod, the movable rod and the bottom plate.

3. The oral cavity opening bracket according to claim 1, characterized in that: A U-shaped groove is formed at the bottom of the tongue depressor.

4. The oral cavity opening support according to claim 3, characterized in that: A notch is formed on the second side of the tongue depressor, and a guiding hole is formed on the inner wall of the notch.

5. The oral cavity opening stent according to claim 4, characterized in that: It further includes a movable assembly, which includes a movable block, a guiding rod, a driving plate, a transmission rod, a transmission shaft and a spring. The movable block is arranged at the notch. An L-shaped groove is formed at the bottom of the movable block, and the L-shaped groove communicates with the U-shaped groove. The first end of the guiding rod is fixedly connected to the movable block, and the second end of the guiding rod is in sliding contact with the inner wall of the guiding hole. The driving plate is fixedly installed on the movable plate. The transmission rod is fixedly installed on the movable rod. A kidney-shaped groove is formed on the transmission rod. The transmission shaft is arranged on the driving plate and is in threaded connection with the driving plate. The transmission shaft is in sliding contact with the inner wall of the kidney-shaped groove. The spring makes the movable block tend to move outwards; When the second end of the movable rod moves upwards, the transmission rod makes the transmission shaft tend to move inwards.

6. The oral cavity opening stent according to claim 5, characterized in that: It further includes a torsion spring, which makes the second end of the movable rod tend to swing downwards.

7. The oral cavity opening stent according to claim 5, characterized in that: A connecting pipe is fixedly installed on the outer side surface of the tongue depressor. A plurality of first water absorption holes are formed on the outer side surface of the tongue depressor. The plurality of first water absorption holes are arranged at intervals along the circumferential direction of the tongue depressor. A first arc-shaped groove is formed inside the tongue depressor, and the first arc-shaped groove communicates with the connecting pipe and the plurality of first water absorption holes.

8. The oral cavity opening stent according to claim 5, characterized in that: A plurality of second water absorption holes are formed on the outer side surface of the movable block, and the plurality of second water absorption holes are arranged at intervals along the circumferential direction of the movable block. A second arc-shaped groove is formed inside the movable block, and the second arc-shaped groove is communicated with each of the plurality of second water absorption holes. The second arc-shaped groove is communicated with the first arc-shaped groove through a hose.

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