Oral cavity mouth gag capable of being finely adjusted

Abstract

The utility model relates to the technical field of auxiliary medical instruments, in particular to a finely adjustable oral cavity mouth gag which comprises a left clamp body, a right clamp body, an adjusting rack, a coarse adjustment locking pressing plate, a fine adjustment assembly and a fine adjustment locking block. The left forceps body and the right forceps body are movably connected, one end is a denture end, and the other end is a holding end; the adjusting rack is arranged on the side, close to the holding end, of the movable connecting position of the left pincer body and the right pincer body and movably connected with the left pincer body and the right pincer body. The coarse adjustment locking pressing plate is connected with the adjusting rack in a meshed mode and movably connected with the right clamp body. The fine adjustment assembly is in meshed connection with the adjustment rack and is movably connected with the left clamp body; the fine adjustment locking block is arranged on the left clamp body, movably connected with the left clamp body and used for fixing the fine adjustment assembly. According to the mouth gag, the adjusting rack is matched with the coarse adjustment locking pressing block and the fine adjustment assembly, coarse adjustment and fine adjustment of the opening degree of the mouth gag can be achieved, the mouth gag can better adapt to the mouth shape of a patient, and the treatment requirement of a doctor is met.

Description

Technical Field

[0001] The utility model relates to the technical field of auxiliary medical devices, in particular to a finely adjustable oral opening device. Background Art

[0002] A mouth opener is an instrument used to open the mouth, assisting patients in opening their mouths and maintaining an open position during oral treatment. It has become a common device used in pediatric oral clinical treatment to assist patients in opening their mouths. This device is primarily used in uncooperative children, younger children, and children who require prolonged mouth opening treatment, to help them open their mouths and cooperate with the doctor during oral treatment. Currently, there are many different types of mouth openers in clinical use, with varying structures and uses.

[0003] However, currently the upper and lower teeth can be engaged in the grooves of the upper and lower trays of the opener, and there are support rings on both sides of the grooves to support and protect the oral cavity. However, the shape and size of the grooves on the existing trays of the opener are fixed, which is not convenient to adjust and cannot adapt to the actual operational needs of children with different tooth sizes. In addition, the trays are relatively hard, and during the opening of the opener, the grooves cannot fit completely with the teeth, causing the teeth to be locally subjected to greater force, which will inevitably cause certain damage to the patient's oral cavity. In addition, the existing oral opener size adjustment has only a few gears to adjust and cannot fully meet the patient's mouth opening needs and the doctor's actual treatment needs.

[0004] Therefore, it is crucial to provide a finely adjustable oral opening device. Utility Model Content

[0005] In order to solve the above problems, the purpose of the present invention is to provide a fine-adjustable oral opening device.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] The utility model provides a fine-adjustable oral opening device, comprising a left clamp body, a right clamp body, an adjustment rack, a coarse-adjustment locking pressure plate, a fine-adjustment component and a fine-adjustment locking block;

[0008] The left caliper body and the right caliper body are movably connected, one end is a tooth support end, and the other end is a gripping end; the adjustment rack is arranged on the side of the movably connected position of the left caliper body and the right caliper body close to the gripping end, and is movably connected to the left caliper body and the right caliper body; the coarse adjustment locking pressure plate is engaged with the adjustment rack and is movably connected to the right caliper body, for realizing coarse adjustment of the opening degree of the left caliper body and the right caliper body; the fine adjustment assembly is engaged with the adjustment rack and is movably connected to the left caliper body, for realizing fine adjustment of the opening degree of the left caliper body and the right caliper body; the fine adjustment locking block is arranged on the left caliper body and is movably connected to the left caliper body, for realizing fixation of the fine adjustment assembly.

[0009] In one embodiment of the present invention, the tooth tray end of the left pliers body is provided with a left tooth tray, and the tooth tray end of the right pliers body is provided with a right tooth tray.

[0010] In one embodiment of the present invention, a first plug is provided at the location where the left tooth holder is connected to the left pliers body, a first slot adapted to the first plug is provided at the location where the left pliers body is connected to the left tooth holder, and the left tooth holder and the left pliers body are connected by a first bolt passing through the first plug and the first slot;

[0011] A second plug-in block is provided at the position where the right tooth support is connected to the right pliers body, and a second slot adapted to the second plug-in block is provided at the position where the right pliers body is connected to the right tooth support. The right tooth support and the right pliers body are connected by passing through the second plug-in block and the second bolt.

[0012] In one embodiment of the present invention, a first fixing hole is provided on the first plug block, and a first hole is provided on the left caliper body to match the first fixing hole; the first bolt extends through the first fixing hole and the first hole to be fixed;

[0013] The second insert block is provided with a second fixing hole, and the right caliper body is provided with a second hole adapted to the second fixing hole; the second bolt extends out of the second fixing hole and the second hole for fixing.

[0014] In one embodiment of the present invention, the outer surface of the left dental tray and the outer surface of the connection position between the left dental tray and the left pliers body are provided with an integrally formed first buffer sleeve; the outer surface of the right dental tray and the outer surface of the connection position between the right dental tray and the right pliers body are provided with an integrally formed second buffer sleeve.

[0015] In one embodiment of the present invention, a left slot hole is provided at the position where the left caliper body is connected to the adjustment rack, allowing the adjustment rack to move along the opening direction of the left caliper body and the right caliper body, and a right slot hole is provided at the position where the right caliper body is connected to the adjustment rack, allowing the adjustment rack to move along the opening direction of the left caliper body and the right caliper body.

[0016] In one embodiment of the present invention, the adjustment rack is an arc-shaped rack, and the adjustment rack is provided with a fine adjustment guide groove movably connected to the left caliper body, and a coarse adjustment guide groove movably connected to the right caliper body. The end of the adjustment rack is provided with a first rack connected to the coarse adjustment locking pressure plate, and a second rack connected to the fine adjustment assembly.

[0017] In one embodiment of the present invention, the left caliper body is movably connected to the adjustment rack via a first pin that passes through the left slot hole and the fine adjustment guide slot;

[0018] The right caliper body is movably connected to the adjustment rack via a second pin shaft that passes through the right slot hole and the coarse adjustment guide slot.

[0019] In one embodiment of the present invention, the length of the coarse adjustment guide groove is greater than the length of the fine adjustment guide groove, and correspondingly, the length of the first rack is greater than the length of the second rack;

[0020] The tooth pitch of the first rack is greater than the tooth pitch of the second rack.

[0021] In one embodiment of the present invention, the coarse adjustment locking pressure plate includes an integrated locking plate and an adjustment rod, the side of the locking plate away from the adjustment rod is embedded in the right slot, and a locking rack adapted to the first rack is provided at the position where the locking plate is connected to the first rack;

[0022] The locking plate is embedded in the right slot and is provided with a mounting slot on a side away from the locking rack. The locking plate is connected to the right caliper body via a third pin that passes through the right slot and the mounting slot.

[0023] A torsion spring is also provided in the installation groove and sleeved on the outside of the third pin shaft.

[0024] In one embodiment of the present invention, a limit pin hole is provided on the locking plate, and the third pin shaft is fixed after passing through the right slot hole and the limit pin hole.

[0025] In one embodiment of the present invention, the fine adjustment assembly includes a knob and a gear, the gear is disposed in the left slot and is meshed with the second rack, and a fourth pin extending out of the left slot is disposed on the top of the gear;

[0026] The knob is sleeved on the outside of the fourth pin and contacts the surface of the left caliper body. The outside of the left caliper body is provided with a plurality of locking grooves connected with the fine-adjustment locking block.

[0027] In one embodiment of the present invention, a locking head adapted to the locking groove is provided on a side of the fine-adjustment locking block close to the knob.

[0028] In one embodiment of the present invention, a slider is provided at the bottom of the fine-tuning locking block, and a sliding groove adapted to the slider is provided on the side where the left caliper body is connected to the fine-tuning locking block, and the sliding groove allows the fine-tuning locking block to move toward and away from the knob.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] (1) The utility model is a fine-adjustable oral opener. By designing a first rack and a second rack at both ends of the adjustment rack, the utility model utilizes the difference in tooth pitch between the first rack and the second rack, and cooperates with the coarse adjustment guide groove and the fine adjustment guide groove provided at both ends to achieve the purpose of coarse adjustment first and then fine adjustment, thereby fully adapting to the patient's mouth shape.

[0031] (2) The utility model is a fine-adjustable oral opener that uses a fine-adjustment component to cooperate with the second rack on the adjustment rack to achieve precise adjustment. The fine-adjustment component is set on the left clamp body. The second rack can be retracted synchronously by rotating the thumb's dial knob, thereby accurately controlling the opening and closing size of the opener. Before and after the fine-adjustment is completed, a fine-adjustment locking block is used to ensure that the fine-adjustment component does not loosen;

[0032] (3) The left and right dental trays in the finely adjustable oral opener of the present invention are detachably hingedly mounted on the jaws of the left and right jaws, and a buffer sleeve is provided on the left and right dental trays. The left and right dental trays can always fit on the patient's teeth during the opening and closing of the jaws, and the force is evenly distributed, thereby improving the patient's comfort when using the opener. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the three-dimensional structure of a finely adjustable oral opening device in a closed state (I) of the present invention;

[0034] Figure 2 for Figure 1 A schematic diagram of the structure at center A;

[0035] Figure 3 This is a schematic diagram of the three-dimensional structure of a finely adjustable oral opening device in a closed state (II) of the present invention;

[0036] Figure 4 for Figure 3 A magnified schematic diagram of the structure at point B in the middle;

[0037] Figure 5 This is a schematic diagram of the three-dimensional structure of the opening state of a finely adjustable oral opening device of the present invention;

[0038] Figure 6 This is an exploded view of a finely adjustable oral opening device of the present invention;

[0039] Figure 7 This is a schematic structural diagram of an adjustment rack in a finely adjustable oral opening device of the present invention;

[0040] Figure 8 This is a structural diagram of a coarse adjustment locking pressure plate in a finely adjustable oral opening device of the present invention;

[0041] Figure 9This is a schematic structural diagram of the left tooth tray in a finely adjustable oral opening device of the present invention;

[0042] Figure 10 This is a schematic structural diagram of a first buffer sleeve in a finely adjustable oral opening device of the present invention;

[0043] Numbers in the figure: 10, left clamp body; 11, left slot; 12, first pin; 13, fourth pin; 14, first slot; 15, first bolt; 20, right clamp body; 21, right slot; 22, second pin; 23, third pin; 24, second slot; 25, second bolt; 30, adjustment rack; 31, fine adjustment guide groove; 32, coarse adjustment guide groove; 33, first rack; 34, second Rack; 40, coarse adjustment locking pressure plate; 41, locking plate; 42, adjusting rod; 43, locking rack; 44, limit pin hole; 45, mounting slot; 46, torsion spring; 50, fine adjustment assembly; 51, gear; 52, knob; 53, locking slot; 60, fine adjustment locking block; 61, locking head; 70, left tooth holder; 71, first plug block; 72, fixing hole; 80, right tooth holder; 90, first buffer sleeve. DETAILED DESCRIPTION

[0044] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0045] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0046] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0047] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0048] Example 1

[0049] This embodiment provides a fine-tunable oral opening device, such as Figures 1 to 9 As shown, it includes a left pliers body 10, a right pliers body 20, an adjustment rack 30, a coarse adjustment locking plate 40, a fine adjustment assembly 50 and a fine adjustment locking block 60; the left pliers body 10 and the right pliers body 20 are symmetrically arranged, and are movably connected in the middle position, with one end being a tooth support end and the other end being a gripping end; the adjustment rack 30 is arranged on the side of the movably connected position of the left pliers body 10 and the right pliers body 20 close to the gripping end, and is movably connected to the left pliers body 10 and the right pliers body 20 (spanning the left pliers body 10 and the right pliers body 20 The coarse adjustment locking plate 40 is engaged with the adjustment rack 30 and is movably connected to the right caliper body 20, so as to realize the coarse adjustment of the opening degree of the left caliper body 10 and the right caliper body 20; the fine adjustment component 50 is engaged with the adjustment rack 30 and is movably connected to the left caliper body 10, so as to realize the fine adjustment of the opening degree of the left caliper body 10 and the right caliper body 20; the fine adjustment locking block 60 is arranged on the left caliper body 10 and is movably connected to the left caliper body 10, so as to realize the fixation of the fine adjustment component 50.

[0050] Furthermore, a left dental tray 70 is provided at the dental tray end of the left clamp body 10, and a right dental tray 80 is provided at the dental tray end of the right clamp body 20; the left dental tray 70 and the right dental tray 80 have the same structure and are symmetrically arranged on both sides;

[0051] Furthermore, a first plug block 71 is provided at the position where the left tooth holder 70 is connected to the left pliers body 10, and a first slot 14 adapted to the first plug block 71 is provided at the position where the left pliers body 10 is connected to the left tooth holder 70. A first fixing hole 72 is provided on the first plug block 71, and a first hole adapted to the first fixing hole 72 is provided on the left pliers body 10; the first bolt 15 extends out of the first fixing hole 72 and the first hole and is fixed (the left tooth holder 70 and the left pliers body 10 are fixed by passing through the first plug block 71 and the first slot 14). The right tooth support 80 and the right pliers body 20 are connected with the first bolt 15); a second plug-in block is provided at the position where the right pliers body 20 is connected with the right tooth support 80, and a second slot 24 adapted to the second plug-in block is provided at the position where the right pliers body 20 and the right tooth support 80 are connected, the second plug-in block is provided with a second fixing hole 72, and the right pliers body 20 is provided with a second hole adapted to the second fixing hole 72; the second bolt 25 extends out of the second fixing hole 72 and the second hole and is fixed (the right tooth support 80 and the right pliers body 20 are connected by passing through the second plug-in block and the second bolt 25).

[0052] Furthermore, a left slot hole 11 is provided at the position where the left caliper body 10 is connected to the adjustment rack 30, allowing the adjustment rack 30 to move along the opening direction of the left caliper body 10 and the right caliper body 20, and a right slot hole 21 is provided at the position where the right caliper body 20 is connected to the adjustment rack 30, allowing the adjustment rack 30 to move along the opening direction of the left caliper body 10 and the right caliper body 20.

[0053] Furthermore, the adjustment rack 30 is an arc-shaped rack, and the adjustment rack 30 is provided with a fine adjustment guide groove 31 movably connected to the left caliper body 10, and a coarse adjustment guide groove 32 movably connected to the right caliper body 20. The end of the adjustment rack 30 is provided with a first rack 33 connected to the coarse adjustment locking pressure plate 40, and a second rack 34 connected to the fine adjustment assembly 50.

[0054] Furthermore, the left caliper body 10 is movably connected to the adjustment rack 30 through a first pin shaft 12 passing through the left slot hole 11 and the fine-adjustment guide groove 31 (which can also limit the left end of the adjustment rack 30 to avoid the adjustment rack 30 from shifting during the movement); the right caliper body 20 is movably connected to the adjustment rack 30 through a second pin shaft 22 passing through the right slot hole 21 and the coarse-adjustment guide groove 32 (which can also limit the right end of the adjustment rack 30 to avoid the adjustment rack 30 from shifting during the movement).

[0055] Furthermore, the length of the coarse-adjustment guide groove 32 is greater than the length of the fine-adjustment guide groove 31 (the specific length can be adjusted accordingly according to actual conditions), and accordingly, the length of the first rack 33 is greater than the length of the second rack 34 (the specific length can be adjusted accordingly according to actual conditions); the tooth pitch of the first rack 33 is greater than the tooth pitch of the second rack 34 (that is, the first rack 33 cooperates with the coarse-adjustment locking pressure plate 40 to achieve coarse adjustment of the opening and closing degree, and the second rack 34 cooperates with the fine-adjustment component 50 to achieve fine adjustment of the opening and closing degree, thereby adapting to different patient mouth shapes and meeting the doctor's treatment needs).

[0056] The locking plate 41 is fixed to the right side of the cam 21 and is secured to the left and right sides of the cam 20. The locking plate 41 is secured to the right side of the cam 20 and is secured to the left and right sides of the cam 20. The locking plate 41 is fixed to the right side of the cam 20 and is secured to the left and right sides of the cam 20.

[0057] Among them, when not subject to external force, one end of the torsion spring 46 always presses against the top of the mounting groove 45 to always apply an upward force to the right end of the locking plate 41, so that the locking rack 43 is always engaged and connected with the first rack 33, thereby preventing the first rack 33 from sliding relative to the locking plate 41; when the adjusting rod 42 is pressed (pressing the adjusting rod 42 toward the side close to the tooth bracket end), the pressing force overcomes the thrust of the torsion spring 46, so that the locking rack 43 is separated from the first rack 33, thereby facilitating the adjustment of the connection point between the locking rack 43 and the first rack 33, thereby achieving the purpose of coarse adjustment.

[0058] Furthermore, the fine-tuning assembly 50 includes a knob 52 and a gear 51, the gear 51 is arranged in the left slot hole 11 and is meshed with the second rack 34, and a fourth pin shaft 13 extending out of the left slot hole 11 is provided on the top of the gear 51 (which not only has a limiting function on the gear 51, but also can serve as a central rotating shaft to realize the synchronous movement of the gear 51 and the knob 52); the knob 52 is sleeved on the outside of the fourth pin shaft 13 and contacts the surface of the left caliper body 10, and the outside of the left caliper body 10 is provided with a plurality of locking grooves 53 connected to the fine-tuning locking block 60.

[0059] Furthermore, a slider is provided at the bottom of the fine-tuning locking block 60, and a slide groove adapted to the slider is provided on the side where the left caliper body 10 is connected to the fine-tuning locking block 60. The slide groove allows the fine-tuning locking block 60 to move toward and away from the knob 52. The side of the fine-tuning locking block 60 close to the knob 52 is also provided with a locking head 61 adapted to the locking groove 53.

[0060] In this embodiment, when coarse adjustment is required: the locking rack 43 and the first rack 33 are separated by pressing the adjustment rod 42. At this time, the opening and closing size of the right clamp body 20 and the bracket end of the left clamp body 10 are roughly adjusted by the grip end. After the coarse adjustment is completed, the condition is reset to achieve the meshing of the locking rack 43 and the first rack 33.

[0061] When fine adjustment is required: the gear 51 can be rotated by rotating the knob 52, which in turn drives the second rack 34 to rotate, thereby precisely adjusting the opening and closing size of the tooth bracket ends of the left pliers body 10 and the right pliers body 20; after the precise adjustment is completed, the locking head 61 can be inserted into the locking groove 53 of the knob 52, thereby fixing the knob 52 (and even the gear 51 and the second rack 34).

[0062] Example 2

[0063] This embodiment provides a finely adjustable oral opening device, which is the same as the first embodiment except for the following features:

[0064] The outer surface of the left tooth tray 70 and the outer surface of the connection position between the left tooth tray 70 and the left pliers body 10 are provided with an integrally formed first buffer sleeve 90 (removable, such as Figure 10 The outer surface of the right dental tray 80 and the outer surface of the connection position between the right dental tray 80 and the right pliers body 20 are provided with an integrally formed second buffer sleeve (removable);

[0065] Among them, the buffer sleeve can be made of rubber or silicone material, which serves as an intermediate connector between the dental tray (left dental tray 70 and right dental tray 80) and the oral cavity, plays a buffering role, and is easy to disassemble and replace; in the process of adjusting the opening and closing degree of the dental tray ends of the left clamp body 10 and the right clamp body 20, it always fits on the patient's teeth, and the force is evenly distributed, which improves the patient's comfort in using the mouth opener.

[0066] The above description of the embodiments is intended to facilitate understanding and use of the utility model by those skilled in the art. Those skilled in the art will readily be able to make various modifications to these embodiments and apply the general principles described herein to other embodiments without requiring inventive effort. Therefore, the utility model is not limited to the above-described embodiments. Improvements and modifications made by those skilled in the art based on the interpretation of this utility model and without departing from the scope of this utility model should be within the scope of protection of this utility model.

Claims

1. A finely adjustable oral opening device, characterized in that: It comprises a left caliper body (10), a right caliper body (20), an adjustment rack (30), a coarse adjustment locking plate (40), a fine adjustment component (50) and a fine adjustment locking block (60); The left pliers body (10) and the right pliers body (20) are movably connected, with one end being a tooth support end and the other end being a gripping end; the adjusting rack (30) is arranged on one side of the movably connected position of the left pliers body (10) and the right pliers body (20) close to the gripping end, and is movably connected to the left pliers body (10) and the right pliers body (20); the coarse adjustment locking pressure plate (40) is meshed with the adjusting rack (30) and is movably connected to the right pliers body (20) for achieving coarse adjustment of the opening degree of the left pliers body (10) and the right pliers body (20); the fine adjustment assembly (50) is meshed with the adjusting rack (30) and is movably connected to the left pliers body (10) for achieving fine adjustment of the opening degree of the left pliers body (10) and the right pliers body (20); the fine adjustment locking block (60) is arranged on the left pliers body (10) and is movably connected to the left pliers body (10) for achieving fixation of the fine adjustment assembly (50).

2. The finely adjustable oral opening device according to claim 1, characterized in that: The tooth support end of the left clamp body (10) is provided with a left tooth support (70), and the tooth support end of the right clamp body (20) is provided with a right tooth support (80).

3. The finely adjustable oral opening device according to claim 2, characterized in that: A first plug-in block (71) is provided at the position where the left tooth support (70) is connected to the left pliers body (10); a first slot (14) adapted to the first plug-in block (71) is provided at the position where the left pliers body (10) is connected to the left tooth support (70); the left tooth support (70) and the left pliers body (10) are connected by a first bolt (15) that passes through the first plug-in block (71) and the first slot (14); A second plug-in block is provided at the position where the right tooth support (80) is connected to the right pliers body (20), and a second slot (24) adapted to the second plug-in block is provided at the position where the right pliers body (20) is connected to the right tooth support (80). The right tooth support (80) and the right pliers body (20) are connected by penetrating the second plug-in block and a second bolt (25).

4. The finely adjustable oral opening device according to claim 1, characterized in that: A left slot hole (11) is provided at a position where the left caliper body (10) is connected to the adjustment rack (30), allowing the adjustment rack (30) to move along the opening direction of the left caliper body (10) and the right caliper body (20); and a right slot hole (21) is provided at a position where the right caliper body (20) is connected to the adjustment rack (30), allowing the adjustment rack (30) to move along the opening direction of the left caliper body (10) and the right caliper body (20).

5. The finely adjustable oral opening device according to claim 4, characterized in that: The adjusting rack (30) is provided with a fine adjustment guide groove (31) movably connected to the left caliper body (10), and a coarse adjustment guide groove (32) movably connected to the right caliper body (20); the end of the adjusting rack (30) is provided with a first rack (33) connected to the coarse adjustment locking pressure plate (40), and a second rack (34) connected to the fine adjustment component (50).

6. The finely adjustable oral opening device according to claim 5, characterized in that: The tooth pitch of the first rack (33) is greater than the tooth pitch of the second rack (34).

7. The finely adjustable oral opening device according to claim 5, characterized in that: The coarse adjustment locking pressure plate (40) includes an integrated locking plate (41) and an adjusting rod (42); the locking plate (41) is embedded in the right slot (21) on a side away from the adjusting rod (42); and a locking rack (43) adapted to the first rack (33) is provided at a position where the locking plate (41) is connected to the first rack (33); The locking plate (41) is embedded in the right slot hole (21) and is provided with a mounting groove (45) on a side away from the locking rack (43). The locking plate (41) is connected to the right caliper body (20) via a third pin shaft (23) that passes through the right slot hole (21) and the mounting groove (45); A torsion spring (46) is also provided in the installation groove (45) and is sleeved on the outside of the third pin shaft (23).

8. The finely adjustable oral opening device according to claim 5, characterized in that: The fine adjustment assembly (50) includes a knob (52) and a gear (51), wherein the gear (51) is disposed in the left slot hole (11) and is meshed with the second rack (34), and a fourth pin (13) extending out of the left slot hole (11) is disposed on the top of the gear (51); The knob (52) is sleeved on the outside of the fourth pin (13) and contacts the surface of the left caliper body (10). The outside of the left caliper body (10) is provided with a plurality of locking grooves (53) connected to the fine-tuning locking block (60).

9. The finely adjustable oral opening device according to claim 8, characterized in that: A locking head (61) adapted to the locking groove (53) is provided on one side of the fine adjustment locking block (60) close to the knob (52).

10. The finely adjustable oral opening device according to claim 9, characterized in that: A slider is provided at the bottom of the fine-adjustment locking block (60), and a slide groove adapted to the slider is provided on the side where the left caliper body (10) is connected to the fine-adjustment locking block (60), and the slide groove allows the fine-adjustment locking block (60) to move toward and away from the knob (52).

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