Saliva suction device with replaceable tongue baffle

Abstract

The invention relates to a saliva suction device with a replaceable tongue baffle. The saliva suction device comprises two main body parts, namely an occlusal pad and the tongue baffle which are embedded with each other, a communicated negative pressure suction channel is arranged between the occlusal pad and the tongue baffle plate, and a plurality of suction holes are formed in the tongue baffle plate and are used for forming negative pressure suction on liquid and aerosol in an oral cavity through the occlusal pad and the tongue baffle plate; the tongue baffle is provided with an arc-shaped bottom plate which is smaller than the tooth form of a patient in size, and the tongue baffle is provided with a receding groove in the air inner end so as to form a fork part on the bottom plate at the inner end; the occlusal pad is of a wedge-shaped structure and comprises a hard base body and soft pads embedded in the upper surface and the lower surface of the hard base body, and the soft pads have proper thickness so that local occlusal can be compensated to prevent tooth loss and prevent the occlusal pad from pivoting.

Description

Technical Field

[0001] This invention relates to an oral treatment device, specifically to a saliva suction device with a replaceable tongue guard. Background Technology

[0002] During dental treatment, patients need to keep their mouths open for extended periods to allow devices such as handpieces and dental mirrors to enter. However, maintaining an open mouth for a long time is a painful process for most patients, and a large amount of saliva and rinsing fluid accumulates in the mouth that cannot be swallowed, thus affecting the patient's breathing or ability to maintain the open mouth position.

[0003] In current procedures, a saliva suction tube is typically placed in the patient's mouth during treatment to aspirate secreted saliva, rinsing fluid sprayed by the treatment device, and debris generated during the treatment. Additionally, to alleviate jaw muscle soreness caused by prolonged mouth opening, existing technologies also incorporate an occlusal pad over the suction tube to assist mouth opening, a typical example being the multifunctional occlusal pad shown in Chinese patent CN101292909A. However, in this approach, the suction tube penetrates directly through the occlusal pad. When the occlusal pad is placed near the molars, this can lead to the suction tube being placed too deeply, causing patient discomfort; furthermore, this approach lacks tongue protection measures.

[0004] Chinese patent CN111529109A discloses a wedge-shaped occlusal pad with saliva suction function. Three main suction tubes 13, 14, and 15 in a mountain-shaped structure are arranged at the middle cross-section of the pad, with several suction branches extending laterally from each main tube. The patent aims to simultaneously suction saliva, rinsing fluid, and aerosols from the oral cavity by setting multiple suction holes (branch openings) at different heights, with aerosol suction being the primary objective. However, this arrangement significantly weakens suction power, resulting in reduced suction of liquids. Furthermore, the laterally arranged suction holes are not conducive to effective saliva suction for patients in a lying position. Additionally, this design lacks tongue protection measures.

[0005] European Patent EP4154846A1 discloses a saliva suction device with a tongue protector 28. Its main body 14 consists of a rigid plastic portion 16 in the shape of a curved column and a soft plastic portion 18 located on the protruding side of the rigid plastic portion. The main body 14 is hollow, and several suction holes 60 are formed on the soft plastic portion 18. The tongue protector 28 is fixedly connected to the rigid plastic portion and located on the recessed side of the main body 14. In use, the main body 14 is placed vertically in the oral cavity, with the soft plastic portion 18 facing down and the rigid plastic portion 16 facing up, and is fixed in the oral cavity by the pressure of the upper and lower jaws. Obviously, this device has a large angle of injury to the oral soft tissues and poor fixation effect. Furthermore, the tongue protector does not effectively block the tongue. For example, when treating a tooth on the left side, only by placing the main body 14 between the tooth and the tongue can the tongue be isolated from the tooth and protected. However, this placement obviously severely restricts the treatment space for the tooth on the left side.

[0006] European patent EP3772349A1 discloses a suction device comprising an upper U-shaped arm 14 and a lower U-shaped arm 24, both injection-molded from rigid plastic, a U-shaped intermediate region 22 connecting the two, and a tongue protector 16 disposed on the outside of the upper U-shaped arm 14. In use, the device is placed under the tongue. However, this device is not conducive to fixation in the oral cavity, provides poor protection for the tongue, and is difficult to assist patients in maintaining a treatment posture for extended periods.

[0007] US Patent 1742080A discloses a clamp-shaped saliva suction device, which includes a rigid suction main tube 32, a chin clamp 22 fixed to the rigid suction main tube 32, and two rigid suction secondary tubes 1 and 2 fixed to the upper section of the suction main tube 32; in use, the two suction secondary tubes 1 and 2 are respectively located on the inner and outer sides of the teeth (see attached patent). Figure 2 The device (as shown) is held against the bottom of the mouth, while a chin clip 22 holds against the chin, thus securing the saliva suction device in a clamp-like manner. One of the suction tubes 2 is also equipped with a tongue baffle 12 to prevent the tongue from touching the affected tooth. The device can achieve effective fixation, but this fixation relies on the strong pressure exerted by the suction tubes 1 and 2 on the bottom of the mouth. However, during prolonged oral treatment, this strong pressure may cause significant oral pain for the patient, making it impossible to maintain the treatment posture. Even with the administration of anesthesia, this prolonged and strong pressure on the oral tissues may still cause damage to the patient's oral tissues. Summary of the Invention

[0008] To address the aforementioned problems in the prior art, the present invention provides a saliva suction device with a replaceable tongue baffle.

[0009] The saliva suction device includes a replaceable occlusal pad and a tongue guard. The term "replaceable occlusal" has two meanings: "replaceable" and "occlusal." "Occlusal" refers to connecting the two independent components, the occlusal pad and the tongue guard, through a snap-fit ​​or plug-in connection. "Replaceable" means that the occlusal pad and the tongue guard can achieve the aforementioned occlusal in more than one form. Specifically, the more than one occlusal form does not refer to a combination of snap-fit ​​and plug-in connections (of course, such a combination is not excluded by this invention), but rather that the occlusal pad and the tongue guard can be occluded at multiple different relative positions. In a specific embodiment of this invention, the occlusal pad and the tongue guard can be occluded at two different relative positions. This configuration allows the saliva suction device of this invention to achieve a replacement of left-side occlusal (meaning the left teeth bite the occlusal pad) and right-side occlusal. That is, by adjusting the occlusal positions, left-side or right-side occlusal occlusal of the occlusal pad can be achieved, while the tongue guard protects and limits the tongue.

[0010] The occlusal pad of the present invention provides at least three functions. The first function is the conventional function of the occlusal pad, which allows the patient to bite the occlusal pad with the molar on the opposite side of the affected tooth to assist the oral patient in opening their mouth and relieve muscle fatigue and soreness caused by long-term mouth opening. The second function is to serve as a fixed base after being bitten, for fitting and fixing the tongue baffle. The third function is to construct a suction channel between the tongue baffle and the occlusal pad after the tongue baffle is fixed in place, and to provide an interface for establishing a negative pressure channel with an external suction device to realize negative pressure suction of saliva, rinsing fluid and aerosol in the oral cavity.

[0011] The tongue guard of this invention also provides at least three functions. The first is to wrap and support the tongue. When it is fitted and fixed with the occlusal pad, it can support the tongue and keep it in an upward position. At the same time, the tongue guard has upward-extending arc-shaped flanges on both sides to restrict the tongue to the upper side of the tongue guard and form a wrap and protection for the lower layer and left and right sides of the tongue. The second is to pull the tongue. The size of the tongue guard is set to be smaller than the tooth size (mainly referring to the horizontal distance between the two teeth), or a tongue guard smaller than the patient's tooth size is selected. Therefore, when the tongue guard is fitted and fixed with the occlusal pad, the tongue guard axis X2 will be offset by a distance D relative to the tongue axis X1 (referring to the tongue axis in the natural state) towards the side opposite to the affected tooth (as in this invention). Figure 8As shown), this pulls the tongue toward the side opposite to the affected tooth, increasing the operating space at the affected tooth; the third type is for saliva suction and aerosol suction, with suction holes set on the two flanges of the tongue baffle and the tail of the base plate (near the root of the tongue), wherein the suction holes on the two flanges open outward and are interconnected by a first tube, which can be an external tube protruding from the upper or lower surface of the base plate, or a hollow channel set inside the base plate; when the tongue baffle is fitted with the occlusal pad, the suction hole on the flange on the fitted side is connected to the suction channel set inside the occlusal pad, so that external negative pressure can be transmitted to the suction hole on the affected tooth side through the suction channel, the suction hole on the occlusal side, and the first tube; the suction hole set at the tail of the base plate is used to improve the suction effect of liquid, which can be connected to the aforementioned first tube through a second tube, or directly connected to the suction channel through the second tube, so as to guide the external negative pressure to the suction hole. Preferably, the suction channel within the occlusal pad can be divided into two independent channels, which are respectively connected to the first tube to suction aerosol and to the second tube to suction liquid.

[0012] As mentioned above, the occlusal pad of the present invention can be fitted and fixed with the tongue baffle in two different positions. However, regardless of the fitting state, the occlusal pad is always fitted with the tongue baffle on only one side, while the other side is in a cavity state. The suction channel is open at both fitting cavities of the occlusal pad. Therefore, the non-fitted side will cause the suction negative pressure to drop due to the direct airflow. To this end, the present invention also provides a sealing plate, which has the same structural shape as the tail flange of the tongue baffle, but the sealing plate is a blind plate without holes, used to seal the suction channel opening on the non-fitted side of the occlusal pad in order to maintain the suction negative pressure.

[0013] Compared with the prior art, the present invention can achieve at least the following beneficial effects: The saliva suction device comprises two main bodies: a bite pad and a tongue baffle, which can simultaneously support the patient's mouth opening and protect the tongue. The tongue baffle structure can be fitted and fixed on either side of the bite pad, allowing adjustment of the tongue baffle's fit according to the specific position of the patient's affected teeth. The arc-shaped bottom structure of the tongue baffle and the locking part located at the fork allow the tongue baffle to slide flexibly and smoothly within the fitting cavity when not under pressure. When the tongue baffle is under pressure, the friction or locking action between the locking part and the inner wall of the fitting cavity resists the lateral thrust exerted by the tongue on the tongue baffle, thereby preventing the tongue baffle from slipping out of the fitting cavity. Suction is provided on both the outer wall of the tongue baffle and the fork. The orifice allows for simultaneous suction of intraoral liquids and aerosols. The size of the tongue baffle ensures that when it is fitted and fixed to the occlusal pad, the central axis of the tongue baffle is offset relative to the central axis of the tongue in its natural state towards the side opposite to the affected tooth, thereby pulling the tongue towards the side opposite to the affected tooth and increasing the operating space on the side of the affected tooth. The occlusal pad consists of a rigid substrate and upper and lower grooves of appropriate thickness fixed to the upper and lower surfaces of the rigid substrate. The thickness of the upper and lower grooves and the wedge shape of the rigid substrate are limited, allowing the upper and lower grooves to compensate for differences in the degree of mouth opening of different patients, overcoming the risk of tooth damage and occlusal pad pivoting caused by local occlusion. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the occlusal pad in the occlusal state; Figure 2 for Figure 1 A magnified view of the area circled in the middle; Figure 3 This is a schematic diagram of the tongue baffle, the first suction hole, and the first pipeline; Figure 4 This is a schematic diagram of the tongue baffle, the second suction hole, and the second pipeline; Figure 5 This is a schematic diagram of the tongue baffle, fork, and locking mechanism. Figure 6 This is a schematic diagram of the sealing plate; Figure 7 This is a schematic diagram showing the tongue guard fitting into and locking with the occlusal pad; Figure 8 This is a diagram illustrating how a tongue guard can pull and protect the tongue.

[0015] In the diagram: 1 is the bite pad, 2 is the hard substrate, 3 is the upper soft pad, 31 is the upper pad groove, 32 is the upper pad wing, 4 is the lower soft pad, 41 is the lower pad groove, 42 is the lower pad wing, 5 is the locking foot, 6 is the locking cavity, 7 is the suction channel, 8 is the tongue baffle, 9 is the bottom plate, 10 is the flange, 11 is the tongue tether groove, 12 is the fork, 13 is the first suction hole, 14 is the first pipe, 15 is the second suction hole, 16 is the second pipe, 17 is the connecting channel, 18 is the locking part, 19 is the sealing plate, F1 is the pressure applied by the tongue to the front part of the tongue baffle, F2 is the pressure applied by the fork to the hard substrate under the action of F1, X1 is the tongue axis, X2 is the tongue baffle axis, and D is the offset distance. Detailed Implementation Plan Example 1 This embodiment provides a saliva suction device with a replaceable tongue baffle, which includes an occlusal pad 1, a tongue baffle 8, and a sealing plate 19. The occlusal pad 1 can be bitten by the teeth and thus fixed in the oral cavity. The occlusal pad 1 is used to support the patient's upper and lower jaws to help the patient maintain an open mouth for a long time. The occlusal pad 1 includes a generally wedge-shaped or isosceles trapezoidal rigid substrate 2, and an upper soft pad 3 and a lower soft pad 4 fixed to the upper and lower sides of the rigid substrate 2. The wedge shape of the rigid substrate 2 allows it to adapt well to the angle between the upper and lower jaws in the open mouth state, so as to improve the support effect on the upper and lower jaws.

[0016] According to clinical standards, the mouth opening of a normal adult is about 4.5 cm; the oral cavity depth is about 4-6.5 cm; the present invention determines the wedge angle α (i.e. the angle between the upper and lower surfaces) of the hard substrate 2 based on the average value of the above parameters, that is, α=2(arctan(4.5 / 2) / 5.25)=46.4 degrees.

[0017] The upper and lower surfaces of the rigid substrate 2 are provided with at least one pair of inserts 5. The at least one pair of inserts 5 located on the same side surface of the rigid substrate 2 have sufficient distance to allow teeth to bite into the gap of the pair of inserts 5. The inserts 5 are embedded in the upper and lower soft pads, which can improve the bonding strength between the rigid substrate 2 and the upper and lower soft pads, and can also form appropriate constraints on the upper and lower soft pads to prevent them from being excessively deformed under the strong biting of the teeth. The upper soft pad 3 and the lower soft pad 4 both include a pad groove and a pad wing. The upper pad groove 31 and the lower pad groove 41 are respectively attached and fixed to the upper and lower surfaces of the rigid substrate 2, and the upper pad wing 32 and the lower pad wing 42 are respectively fitted and fixed to the inserts 5 on the upper and lower surfaces of the rigid substrate 2.

[0018] The upper groove 31 and lower groove 41 have a thickness of 3-5 mm. At this thickness, the upper and lower grooves can deform appropriately during biting to avoid a hard bite between the teeth and the hard matrix 2, which could damage the teeth. Simultaneously, the appropriate deformation of the upper and lower grooves can compensate for the different occlusal effects of the occlusal pad 1 on different patients. For example, due to differences in the maxillary and mandibular states of different patients, their maximum mouth opening angles are different. Therefore, if the occlusal pad 1 only includes the hard matrix 2, or if the thickness of the upper and lower grooves 31 is insufficient, the patient's teeth may only bite a portion of the occlusal pad 1, rather than the entire upper and lower surfaces. Typically, when the wedge angle (the angle between the upper and lower surfaces of the wedge-shaped structure) of the hard matrix 2 is greater than the angle between the upper and lower surfaces of the patient's maxillary and mandibular structures, the patient's teeth may bite only a portion of the occlusal pad 1, rather than the entire upper and lower surfaces. At the maximum opening angle, the patient's teeth can only bite the upper and lower surfaces of the front end (the large end of the wedge-shaped structure) of the hard substrate 2; conversely, the patient's teeth can only bite the upper and lower surfaces of the rear end of the hard substrate 2, thus forming the aforementioned partial occlusion. This partial occlusion results in a small contact area between the teeth and the occlusal pad 1, leading to the following two risks: first, it can cause the occluding teeth to bear excessive occlusal pressure, which can easily damage the teeth; second, it can cause the occlusal pad 1 to pivot around the occlusal point. Especially when the occlusal pad of this invention is used to fix the tongue baffle 8 of the present invention, since the tongue baffle 8 is fixed on the occlusal pad on one side and bears the pressure applied by the tongue, the risk of the occlusal pad 1 pivoting around the occlusal point will be greatly increased.

[0019] The 3-5mm thick upper and lower grooves can effectively compensate for the localized occlusal state when such a situation occurs. This is achieved through the deformation of the grooves themselves, in conjunction with at least a pair of inserts 5 located on the upper and lower surfaces of the rigid substrate 2 (which restrict the deformation of the grooves to the upper and lower surfaces of the rigid substrate 2, and the inserts 5 also constrain and position the rigid substrate 2 between the teeth, preventing the occlusal pad from slipping off due to the deformation of the upper and lower grooves). This allows the upper and lower surfaces of the occlusal pad 1 to bear the occlusal force of the teeth as a whole, reducing damage to the occlusal teeth and reducing the risk of the occlusal pad 1 pivoting around the occlusal point. This is important for the subsequent unilateral fitting of the tongue baffle 8 of the present invention into the occlusal pad 1 and maintaining its stability. Although further increasing the thickness of the grooves is still effective in compensating for localized occlusion, excessively thick grooves would limit the vertical dimensions of the rigid substrate 2, making it difficult to arrange structures such as the fitting cavity 6 and the suction channel 7 on the rigid substrate 2. After multiple occlusal experiments, it was found that a groove thickness of 3-5mm is appropriate.

[0020] Both sides of the rigid substrate 2 are provided with fitting cavities 6 for fitting and fixing with the tongue baffle 8. The fitting cavity 6 has a cross-sectional shape (specifically, a cross-section perpendicular to the axis of the rigid substrate 2) that matches the flange 10 and fork 12 of the tongue baffle 8 and has an arc that matches the bottom plate 9 of the tongue baffle 8. At the same time, the dimensions of each part of the fitting cavity 6 are slightly larger than the thickness of the corresponding position of the tongue baffle 8, that is, the two adopt a clearance fit, so that the tongue baffle 8 can slide smoothly in the fitting cavity 6 when it is not under pressure. When the tongue baffle 8 is subjected to tongue pressure, the locking part 18 on the upper surface of the fork 12 presses tightly against the inner wall of the fitting cavity 6 and prevents the tongue baffle 8 from sliding out of the fitting cavity 6 through friction or locking action.

[0021] The locking part 18 may be a high-friction surface with a large roughness to provide frictional force between it and the fitting cavity 6 when the tongue baffle 8 is under pressure; or the locking part 18 may be a toothed structure, with corresponding locking teeth provided at the end of the fitting cavity 6 to engage with the toothed structure at the end of the fitting cavity 6 when the tongue baffle 8 is under pressure, thereby providing a locking effect.

[0022] The rigid substrate 2 is provided with a suction channel 7 between the fitting cavities 6 on both sides of the side wall; the inner side wall of the fitting cavity 6 (referring to the side close to the axis of the rigid substrate 2) is provided with a plurality of connecting holes corresponding to the first suction hole 13 on the outer side of the flange 10 of the tongue baffle 8; the connecting holes are connected to the suction channel 7, so that when the tongue baffle 8 is installed in place, a negative pressure suction path can be established through the suction channel 7, the connecting holes, and the first suction hole 13.

[0023] The tongue baffle 8 has an arc-shaped base plate 9 and flanges 10 located on both sides of the breathing base plate 9. The flanges 10 extend toward the concave side of the arc-shaped base plate 9. The tail of the base plate 9 is provided with a relief groove 11. The width of the relief groove 11 is smaller than the width of the inner end of the base plate 9, thereby forming a fork 12 on both sides of the inner end of the base plate 9. The relief groove 11 is provided so that when the tongue baffle 8 is installed in place, the base plate 9 will not compress the frenulum of the tongue.

[0024] The size of the tongue baffle 8 should be smaller than the patient's tooth dimensions (mainly referring to the horizontal distance between the two teeth). In actual use, tongue baffles 8 of various sizes can be configured to fit different patients. Therefore, when the tongue baffle 8 is fitted and fixed with the occlusal pad 1, the tongue baffle axis X2 will be offset by a distance D relative to the tongue axis X1 (referring to the tongue axis in its natural state) towards the opposite side of the affected tooth (as in this invention). Figure 8 As shown in the figure, this pulls the tongue toward the opposite side of the affected tooth, increasing the operating space at the affected tooth; The outer sides of the flanges 10 on both sides of the tongue baffle 8 are provided with a plurality of first suction holes 13; all the first suction holes are interconnected through first pipes 14 provided on the base plate 9 and the flanges 10; the number, size, and position of the first suction holes 13 are the same as or correspond to the aforementioned connecting holes located on the inner wall of the fitting cavity 6, so that when the tongue baffle 8 is installed in place, the first suction holes 13 on the flanges 10 on the fitting side form an airtight connection with the corresponding connecting holes on the inner wall of the fitting cavity 6, and the suction negative pressure is transmitted to the first suction holes 13 on the flanges 10 on the opposite side through the first pipes 14 to form negative pressure suction on the affected tooth side.

[0025] The first pipe 14 may be an external pipe that protrudes from the upper or lower surface of the base plate 9, or it may be a hollow channel that is provided inside the base plate 9.

[0026] The base plate 9 is provided with several second suction holes 15 along the edge of the relief groove 11 at its tail end; each second suction hole 15 is interconnected through a second pipe 16; the second pipe 16 is connected to the first pipe 14 or the suction channel 7 through a connecting channel 17; or further, a second suction channel (not shown in the figure) is also provided on the rigid substrate 2, and the second pipe 16 is connected to the second suction channel through the connecting channel 17; thereby allowing two independent negative pressures to be provided from the suction channel 7 and the second suction channel respectively, thereby realizing aerosol suction on the affected tooth side through the suction channel 7, the first pipe 14 and the first suction hole 13, and liquid suction on the root of the tongue and the area below it through the second suction channel, the connecting channel 17, the second pipe 16 and the second suction hole 15.

[0027] The sealing plate 19 has the same structural shape as the flange 10 and fork 12 at the tail of the tongue baffle 8, but the sealing plate 19 is a blind plate without holes, used to seal the communication hole in the inner wall of the interlocking cavity 6 on the opposite side of the tongue baffle 8, so as to maintain sufficient suction negative pressure on the affected tooth side and / or the root of the tongue.

[0028] The above are merely examples of preferred embodiments of the present invention and should not be construed as limiting all feasible embodiments. The actual scope of protection of the present invention is defined by the claims.

Claims

1. A saliva absorbing device with replaceable tongue barrier, comprising a bite pad (1) and a tongue barrier (8); the bite pad (1) can be bitten by teeth and fixed in the oral cavity; characterized in that: The bite pad (1) comprises a hard base (2) in the shape of a wedge or isosceles trapezoid, an upper soft pad (3) and a lower soft pad (4) fixed on the upper and lower sides of the hard base (2); the tongue stopper (8) has an arc-shaped bottom plate (9) and flanges (10) on both sides of the arc-shaped bottom plate (9), the flanges (10) extend towards the concave side of the bottom plate (9), the tail of the bottom plate (9) is provided with a clearance slot (11), the width of the clearance slot (11) is smaller than the width of the inner end of the bottom plate (9) so as to form a fork (12) on both sides of the inner end of the bottom plate (9), the upper surface of the fork (12) is provided with a locking part (18); both side walls of the hard base (2) are provided with an embedded cavity (6) for embedded fixing with the tongue stopper (8), the embedded cavity (6) has a cross-sectional shape matching the flange (10) and the fork (12) of the tongue stopper (8), and also has an arc matching the bottom plate (9); the outer side of each of the flanges (10) is provided with a plurality of first suction holes (13); all the first suction holes are connected with each other through a first pipeline (14) arranged on the bottom plate (9) and the flange (10); the edge of the clearance slot (11) is provided with a plurality of second suction holes (15); each second suction hole (15) is connected through a second pipeline (16) and connected to the first pipeline (14) through a connecting channel (17); the hard base (2) is provided with a suction channel (7) between the embedded cavities (6) of the two side walls; a plurality of communication holes corresponding to the first suction holes (13) are arranged on the inner side wall of the embedded cavity (6); the communication holes are connected to the suction channel (7).

2. The saliva ejector of claim 1, wherein: It also comprises a blocking plate (19) for blocking the communication holes of the inner side wall of the embedded cavity (6) on the opposite side of the tongue stopper (8); the embedded cavity (6) is gap-fitted with the tongue stopper (8), and the gap-fitting meets that the tongue stopper (8) can slide smoothly in the embedded cavity (6) when the tongue stopper (8) is not under pressure, and the locking part (18) is tightly fitted with the inner wall of the embedded cavity (6) when the tongue stopper (8) bears the pressure of the tongue, thereby preventing the tongue stopper (8) from sliding out of the embedded cavity (6).

3. The saliva ejector of claim 1, wherein: The size of the tongue stopper (8) is smaller than the size of the tooth of the patient, so that when the tongue stopper (8) is embedded and fixed with the bite pad (1), the tongue stopper axis (X2) is offset by a distance D relative to the tongue axis (X1) to the opposite side of the tooth, thereby pulling the tongue to the opposite side of the tooth and increasing the operation space of the tooth.

4. The saliva ejector of claim 1, wherein: The upper and lower surfaces of the hard base (2) are each provided with at least one pair of embedded feet (5), and at least one pair of embedded feet (5) on the same side surface of the hard base (2) have a sufficient distance to allow the teeth to bite into the gap between the embedded feet (5), and the embedded feet (5) are embedded in the upper and lower soft pads.

5. The saliva ejector of claim 1, wherein: The wedge degree α of the hard base (2) is 46.4 degrees.

6. The saliva ejector of claim 1, wherein: The locking part (18) is a high-friction surface and / or a tooth-like structure.

7. The saliva ejector of claim 5, wherein: The upper soft pad (3) and the lower soft pad (44) each comprise a pad groove and a pad wing, wherein the upper pad groove (31) and the lower pad groove (41) are respectively fixedly attached to the upper and lower surfaces of the hard base body (22), and the upper pad wing (332) and the lower pad wing (42) are respectively fixedly embedded with the feet (5) on the upper and lower surfaces of the hard base body (2).

8. The saliva ejector of claim 7, wherein: The upper pad groove (31) and the lower pad groove (41) have a thickness of 3-5 mm, so as to compensate for local occlusion by deformation, prevent tooth damage caused by local occlusion, and avoid pivoting of the occlusal pad (1) around the occlusal point.

9. The saliva ejector of claim 7, wherein: The hard base body (2) is further provided with a second suction passage, and the second pipeline (16) directly communicates with the second suction passage through a connecting passage (17).

10. The saliva ejector of any one of claims 1-9, wherein: The first pipeline (14) is an external pipeline protruding from the upper surface or the lower surface of the bottom plate (9), or a hollow hole provided in the bottom plate (9).

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