A saliva suction device for impacted tooth extraction

Abstract

This invention belongs to the field of medical devices and relates to a saliva suction device for impacted tooth extraction. The saliva suction device includes a suction working end and a negative pressure control device. The suction working end is fixedly positioned in the retromolar pad area and comprises three suction parts, each positioned at a specific suction point. The negative pressure control device controls the negative pressure of each suction part. By distributing the suction parts across the suction points in the retromolar pad area and centrally controlling the negative pressure of each suction part, the saliva suction device completely avoids movement across the surgical area and does not obstruct the surgeon's surgical operation or field of vision. It also achieves the effect of hands-free, fixed suction.

Description

Technical Field

[0001] This invention belongs to the field of medical devices and relates to a saliva suction device, particularly a saliva suction device for impacted tooth extraction. Background Technology

[0002] Teeth that are improperly positioned within the jawbone and cannot erupt into their normal occlusal position are called impacted teeth. The most common impacted tooth is the mandibular third molar. Because impacted teeth are misaligned, blocked by adjacent teeth, and some may even be completely embedded in bone tissue, their extraction is more difficult than that of other teeth.

[0003] Generally, to improve the surgical field of view, reduce patient discomfort, and prevent coughing during surgery, nursing staff need to use a saliva suction device to assist the doctor in aspirating fluids from the surgical area and surrounding areas. Depending on the positioning of the medical staff and the angle that facilitates cooperation, the working end of the saliva suction device is usually placed on the outside of the alveolar bone. However, since rinsing fluids and other liquids will slowly accumulate on the inside of the alveolar bone during surgery, nursing staff need to move the working end of the saliva suction device to the inside of the alveolar bone from time to time to aspirate the fluids in order to avoid causing the patient to cough or aspirate. However, moving from the outside of the alveolar bone to the inside of the alveolar bone will cross the surgical area, which will interfere with the doctor's surgical field of view and operation.

[0004] In addition, after the extraction of impacted teeth, it is necessary to aspirate the blood and other fluids in the alveolar socket to observe whether there are any abnormalities such as residual roots. At this time, a good field of vision is required. However, when the current saliva suction device is used to aspirate the fluid from the alveolar socket, the working end of the saliva suction device is inserted into the surgical area from outside the mouth. Even if different insertion angles are selected, it will still obstruct the doctor's surgical field of vision to a certain extent.

[0005] Finally, because impacted tooth extraction involves the use of various instruments, it is usually performed in a four- or six-handed manner. Regardless of the method, once the suction device is connected to the strong and weak suction heads on the dental chair, the caregiver must hold the device and perform real-time suction, making it impossible to achieve automatic suction without manual intervention.

[0006] In summary, the current saliva suction devices used in impacted tooth extraction have the following main drawbacks:

[0007] 1. Because the working end of the saliva suction device is single-headed, the working end of the saliva suction device needs to frequently move back and forth between liquid accumulation points such as the outer and inner sides of the alveolar bone to absorb the liquid. However, moving from the outer side of the alveolar bone to the inner side of the alveolar bone will pass through the surgical area, which will interfere with the doctor's surgical field of vision and operation.

[0008] 2. When the working end of the saliva suction device extends from outside the mouth into the alveolar socket inside the mouth, even if different insertion angles are selected, it will still obstruct the surgeon's field of vision to a certain extent.

[0009] 3. In the current working mode, after the saliva suction device is connected to the strong and weak suction heads on the dental chair, the caregiver needs to hold the saliva suction end to perform real-time suction, which cannot achieve the effect of automatic saliva suction without holding the hand.

[0010] In addition, in existing technologies, most methods for addressing multi-point suctioning involve using several independent suction channels. When one of the suction channels is not drawing in any liquid, the suction tube will draw in a large amount of air. If there is only one negative pressure input source and there is no negative pressure adjustment setting, the negative pressure in the suction tube will be quickly lost. Other suction channels with liquid will require a greater negative pressure source to draw in liquid, but the negative pressure of the suction head on the dental chair is usually fixed (divided into strong suction and weak suction, which cannot be adjusted), which cannot meet the needs.

[0011] To ensure the normal suctioning of other suction tubes, some technical solutions involve manually sealing the suction end that does not require suctioning. Manually sealing the suction end requires pulling it out of the mouth, which can easily cause contamination. If the procedure is performed inside the mouth, it can easily interfere with the surgeon's operation.

[0012] Therefore, in order to reduce the impact of existing saliva suction devices on the surgeon's surgical field and operation during impacted tooth extraction, this invention proposes a saliva suction device for impacted tooth extraction. Summary of the Invention

[0013] The purpose of this invention is to address the issue that existing saliva suction devices can affect the surgeon's operation and field of vision during impacted tooth extraction surgery. This invention proposes a saliva suction device for impacted tooth extraction surgery.

[0014] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0015] A saliva suction device for impacted tooth extraction includes at least a saliva suction working end and a negative pressure control device; the saliva suction working end is a square tube and includes a first saliva suction part, a second saliva suction part and a third saliva suction part; the first saliva suction part is located on the lingual side of the surgical area; one end of the second saliva suction part is connected to the first saliva suction part and is located on the molar pad; the third saliva suction part is connected to the second saliva suction part and is located on the buccal side of the surgical area.

[0016] The negative pressure control device includes at least a negative pressure adjustment module, a negative pressure input terminal, and a negative pressure output terminal; the negative pressure input terminal is connected to the negative pressure suction head on the dental chair, and the negative pressure output terminal includes a first negative pressure output unit, a second negative pressure output unit, and a third negative pressure output unit; the negative pressure input terminal and the negative pressure output terminal are connected through the negative pressure adjustment module;

[0017] The first, second, and third saliva suction units each contain independent saliva suction channels; the saliva suction channel of the first saliva suction unit is connected to the first negative pressure output unit; the saliva suction channel of the second saliva suction unit is connected to the second negative pressure output unit; and the saliva suction channel of the third saliva suction unit is connected to the third negative pressure output unit. The negative pressure adjustment module is used to adjust the negative pressure of each negative pressure output unit.

[0018] Specifically, a first liquid flow sensor is installed on the first negative pressure output unit, a second liquid flow sensor is installed on the second negative pressure output unit, and a third liquid flow sensor is installed on the third negative pressure output unit; the negative pressure adjustment module adjusts the negative pressure of each negative pressure output unit according to the liquid flow data collected by each liquid flow sensor.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. Compared to the existing saliva suction devices, the placement of each suction part in this invention does not affect the surgeon's operation or surgical field of vision. Furthermore, by fixing the suction end to the molar pad, nursing staff do not need to manually move the suction end between different points to aspirate liquid. This achieves a hands-free, fixed effect while avoiding interference with the surgeon's field of vision and operation due to movement across surgical areas.

[0021] 2. Each saliva suction unit draws liquid from the mouth through an independent suction channel. The negative pressure of each saliva suction unit is controlled by an independent negative pressure output unit to prevent the rapid loss of negative pressure in the suction channel when one saliva suction unit is empty, which would prevent other saliva suction units that need to draw liquid from drawing liquid from being unable to do so properly.

[0022] 3. The removable elastic pad can avoid rigid contact between the suction end and the molar pad, which helps protect the oral mucosa in the molar pad area. Through the cooperation of the molar pad and the removable elastic pad, the suction end is more firmly set in the molar pad area.

[0023] 4. The movement trajectory of the saliva suction tube is from the area behind the molar pad to the alveolar socket, which is an inside-out movement path. For impacted tooth extraction surgery, which is an outside-in movement path, this can minimize interference with the surgeon's operation and obstruction of the field of vision.

[0024] 5. The negative pressure regulation method of the negative pressure regulation module enables the suction section with a large liquid flow rate to obtain a longer negative pressure maintenance time. The negative pressure regulation method based on liquid flow rate can effectively improve the working efficiency of the suction end. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the saliva suction device;

[0026] Figure 2 This is a schematic diagram of the saliva suction working end;

[0027] Figure 3 This is a schematic diagram of the negative pressure control device and a cross-sectional view of the negative pressure adjustment module;

[0028] Figure 4 This is a schematic diagram of the enlarged cross-sectional structure of the first saliva-suction section;

[0029] Figure 5 This is a partial enlarged cross-sectional schematic diagram of the second saliva suction unit;

[0030] Figure 6 This is a partial enlarged cross-sectional schematic diagram of the third saliva-suction section;

[0031] Figure 7 A schematic diagram showing the detachable installation of each saliva suction part and a partial cross-sectional structure of the extension tube;

[0032] Figure 8 This is a schematic diagram of the enlarged cross-sectional structure of the extension tube;

[0033] Figure 9 This is a schematic diagram of the structure installed inside the mouth of the saliva suction device.

[0034] The meanings of the symbols marked in the figure are as follows:

[0035] 1. First suction section; 11. Lingual suction tip; 111. Lingual suction channel; 112. Lingual suction orifice; 12. Lingual connecting tube; 2. Second suction section; 21. Alveolar fossa suction tip; 211. Corrugated tube; 212. Conical tube; 22. Transverse suction tube; 221. Central external channel; 222. Alveolar fossa suction channel; 23. Left-curved tube; 24. Right-curved tube;

[0036] 3. Third saliva suction section; 31. Buccal saliva suction head; 311. Buccal external channel; 312. Buccal middle channel; 313. Buccal saliva suction channel; 314. Buccal saliva suction hole; 32. Buccal connecting tube; 33. Extension tube; 331. First channel; 332. Second channel; 333. Third channel;

[0037] 4. Negative pressure control device; 41. Negative pressure adjustment module; 411. Reversing rod; 412. Air inlet; 413. Air outlet; 414. First through hole; 415. Second through hole; 42. Negative pressure input end; 43. Negative pressure output end; 431. First negative pressure output unit; 432. Second negative pressure output unit; 433. Third negative pressure output unit; 44. Liquid flow sensor; 441. First liquid flow sensor; 442. Second liquid flow sensor; 443. Third liquid flow sensor; 5. Removable elastic pad. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0039] Therefore, the following detailed description of embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely illustrates some embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0040] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0041] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0042] In the description of this invention, it should be noted that the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. These terms are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0043] As attached Figure 1 -Appendix Figure 9 As shown, this embodiment is a saliva suction device for impacted tooth extraction. The saliva suction device includes at least a saliva suction working end and a negative pressure control device 4. The saliva suction working end includes multiple suction parts, namely a first suction part 1, a second suction part 2, and a third suction part 3. The first suction part 1 is located on the inner side of the alveolar bone in the surgical area. For ease of description, the inner side of the alveolar bone in the surgical area is referred to as the lingual side of the surgical area. One end of the second suction part 2 is connected to the first suction part 1. The second suction part 2 is located on the molar pad and is used to suction the fluid in the alveolar socket after the impacted tooth is extracted. The third suction part 3 is connected to the second suction part 2. The third suction part 3 is located on the outer side of the alveolar bone in the surgical area. For ease of description, the outer side of the alveolar bone in the surgical area is referred to as the buccal side of the surgical area. The first suction part 1 extends from back to front.

[0044] The retromolar pad is a mucosal soft pad located distal to the alveolar ridge of the mandibular last molar. The suction end is U-shaped and positioned on the retromolar pad to restrict its movement. Compared to the existing suction devices, the placement of each suction part in this invention does not affect the surgeon's operation or surgical field of vision. Furthermore, fixing the suction end to the retromolar pad avoids interference with the surgeon's operation and ensures that each suction part is positioned at the correct suction point. This eliminates the need for nursing staff to manually move the suction end between points for liquid aspiration, achieving a hands-free fixation effect while preventing movement across surgical areas that could interfere with the surgeon's field of vision and operation.

[0045] The negative pressure control device 4 includes at least a negative pressure adjustment module 41, a negative pressure input terminal 42, and a negative pressure output terminal 43. The negative pressure input terminal 42 is connected to the negative pressure suction head on the dental chair. The negative pressure output terminal 43 includes three independent negative pressure output units, namely a first negative pressure output unit 431, a second negative pressure output unit 432, and a third negative pressure output unit 433. The negative pressure input terminal 42 and the negative pressure output terminal 43 are connected by the negative pressure adjustment module 41, which is used to adjust the negative pressure of each negative pressure output unit.

[0046] The first saliva suction unit 1, the second saliva suction unit 2, and the third saliva suction unit 3 each contain an independent saliva suction channel; the saliva suction channel of the first saliva suction unit 1 is connected to the first negative pressure output unit 431 after passing through the second saliva suction unit 2 and the third saliva suction unit 3; the saliva suction channel of the second saliva suction unit 2 is connected to the second negative pressure output unit 432 after passing through the third saliva suction unit 3; and the saliva suction channel of the third saliva suction unit 3 is connected to the third negative pressure output unit 433.

[0047] Each saliva suction unit draws liquid from the mouth through an independent suction channel. The negative pressure of each saliva suction unit is controlled by an independent negative pressure output unit to prevent a situation where a saliva suction unit becomes empty, causing a rapid loss of negative pressure in the suction channel and preventing other saliva suction units that need to draw liquid from from being unable to do so. "Empty suction" refers to the saliva suction unit drawing in air when there is no liquid to draw.

[0048] Preferably, the negative pressure regulating module 41 includes an air inlet 412, an air outlet 413, and a reversing rod 411. The air inlet includes a first air inlet 412A, a second air inlet 412B, and a third air inlet 412C. The first air inlet 412A is connected to the first negative pressure output unit 431, the second air inlet 412B is connected to the second negative pressure output unit 432, and the third air inlet 412C is connected to the third negative pressure output unit 433. The air outlet 413 is connected to the negative pressure input terminal 42. The reversing rod 411 is disposed between the air outlet 413 and the air inlet, and a through hole is provided on the reversing rod 411. The through hole includes a first through hole 414 and a second through hole 415. The air outlet 413 is connected to the air inlet through the through hole. When the first through hole is connected to the first air inlet, the second through hole is outside the third air inlet.

[0049] Before the tooth is extracted, the liquid is mainly concentrated in the first and third suction sections. The suction demand of the second suction section is very low. By moving the reversing rod back and forth, the first and second through holes are set so that the negative pressure from the negative pressure input end can be switched only between the first and third negative pressure output units. When the impacted tooth is extracted, when there is less liquid in the first or third suction section, the through hole is connected to the second air inlet first. At this time, suction is mainly carried out in the second suction section.

[0050] Preferably, the second saliva suction part 2 and the first saliva suction part 1 are connected by an "S"-shaped structure; the second saliva suction part 2 and the third saliva suction part 3 are connected by an "S"-shaped structure.

[0051] Due to the influence of the soft tissue in the cheek, the space on the buccal side of the retromolar pad is relatively limited. The "S"-shaped structure can reduce the interference of the buccal soft tissue to a certain extent, making the suction end more securely fixed on the retromolar pad. Meanwhile, the inner side of the retromolar pad is close to the root of the tongue. The "S"-shaped structure can keep the first suction part away from the root of the tongue, avoiding the situation where stimulating the root of the tongue causes the patient's pharyngeal reflex, which in turn affects the doctor's surgical operation.

[0052] Preferably, a removable elastic pad 5 is provided on the first saliva suction part 1 and the third saliva suction part 3 respectively.

[0053] The removable elastic pad can avoid rigid contact between the suction end and the molar pad, which helps protect the oral mucosa in the molar pad area. Through the cooperation of the molar pad and the removable elastic pad, the suction end is more firmly set in the molar pad area.

[0054] Preferably, the first saliva suction section 1 includes a lingual saliva suction head 11 and a lingual connecting tube 12; the second saliva suction section 2 includes an alveolar saliva suction head 21, a transverse saliva suction tube 22, a left-curved tube 23, and a right-curved tube 24. The alveolar saliva suction head 21 is located in the middle of the transverse saliva suction tube 22 and includes a bendable corrugated tube 211 and a tapered tube 212. The left-curved tube 23 and the right-curved tube 24 are respectively located on both sides of the transverse saliva suction tube 22; the third saliva suction section 3 includes a buccal saliva suction head 31, a buccal connecting tube 32, and an extension tube 33. The buccal saliva suction head 31 is connected to the buccal connecting tube 32 and the extension tube 33 on both sides, and the extension tube 33 is connected to the negative pressure output end 43; the left-curved tube 23 is used to connect to the lingual connecting tube 12; and the right-curved tube 24 is used to connect to the buccal connecting tube 32.

[0055] To avoid interference with the surgeon's operation, the corrugated tube 211 of the alveolar fossa suction tip 21 is compressed before the impacted tooth is extracted. Preferably, the conical tube is offset to the left or right. After the impacted tooth is extracted, the conical tube is pulled into the alveolar fossa for fluid aspiration. The alveolar fossa suction tip 21 moves from the retromolar pad area to the alveolar fossa, which is an inside-out operation. For outside-in operations in impacted tooth extraction surgery, this minimizes interference with the surgeon's operation and avoids obstruction of the field of vision.

[0056] Preferably, the components of the multiple saliva suction parts at the saliva suction working end, as well as the multiple saliva suction parts themselves, are connected by a detachable structure to reduce the difficulty of processing.

[0057] The lingual saliva suction head 11 is provided with a lingual saliva suction channel 111 and several lingual saliva suction holes 112 communicating with the lingual saliva suction channel 111; the transverse saliva suction tube 22 is provided with an alveolar fossa saliva suction channel 222, which is conductively connected to the alveolar fossa saliva suction head 21; the transverse saliva suction tube 22 is also provided with a central external channel 221 communicating with the lingual saliva suction channel 111; the buccal saliva suction head 31 is provided with a buccal saliva suction channel 313 and several buccal saliva suction holes 314 communicating with the buccal saliva suction channel 313.

[0058] Preferably, the extension tube 33 includes three independent saliva suction channels, namely a first channel 331, a second channel 332, and a third channel 333; wherein, one end of the first channel 331 is connected to the outer cheek channel 311, and the other end is connected to the first negative pressure output unit 431; one end of the second channel 332 is connected to the middle cheek channel 312, and the other end is connected to the second negative pressure output unit 432; one end of the third channel 333 is connected to the cheek-side saliva suction channel 313, and the other end is connected to the third negative pressure output unit 433.

[0059] In use, the first negative pressure output unit 431 is connected to the first saliva suction part 1, the second negative pressure output unit 432 is connected to the second saliva suction part 2, and the third negative pressure output unit 433 is connected to the third saliva suction part 3.

[0060] Preferably, a liquid flow sensor 44 is provided on the negative pressure output unit, a first liquid flow sensor 441 is provided on the first negative pressure output unit 431, a second liquid flow sensor 442 is provided on the second negative pressure output unit 432, and a third liquid flow sensor 443 is provided on the third negative pressure output unit 433; the negative pressure adjustment module 41 adjusts the negative pressure of each negative pressure output unit by reversing the distribution based on the liquid flow data collected by each liquid flow sensor 44.

[0061] Preferably, in order to improve saliva suction efficiency, the present invention also includes a negative pressure adjustment method, which is as follows:

[0062] Step S1: Flow detection. Connect the negative pressure input terminal 42 to the first negative pressure output unit 431 via the reversing rod. After a time T1, calculate the liquid flow rate a flowing through the first negative pressure output unit 431 within the time T1. Connect the negative pressure input terminal 42 to the second negative pressure output unit 432 via the reversing rod. After a time T1, calculate the liquid flow rate b flowing through the second negative pressure output unit 432 within the time T1. Connect the negative pressure input terminal 42 to the third negative pressure output unit 433 via the reversing rod. After a time T1, calculate the liquid flow rate c flowing through the third negative pressure output unit 433 within the time T1.

[0063] Step S2: Negative pressure maintenance duration allocation. Connect the negative pressure input terminal 42 to the first negative pressure output unit 431 and maintain the first negative pressure duration; then connect the negative pressure input terminal 42 to the second negative pressure output unit 432 through the reversing rod and maintain the second negative pressure duration; finally, connect the negative pressure input terminal 42 to the third negative pressure output unit 433 through the reversing rod and maintain the third negative pressure duration.

[0064] Step S3: After step S2 is completed, start step S1 again until the surgery is finished.

[0065] Preferably, after repeated practice, the inventors provide the following negative pressure maintenance duration setting method in step S2 to improve saliva suction efficiency. The first negative pressure duration is set to... The duration of the second negative pressure is The duration of the third negative pressure is .

[0066] Preferably, the specific values ​​of duration T1 and duration T2 can be set by those skilled in the art based on factors such as the duration of the operation, and no specific limitation is made in this invention.

[0067] The negative pressure regulation method of the negative pressure regulation module enables the suction section with a large liquid flow rate to obtain a longer negative pressure maintenance time. The negative pressure regulation method based on liquid flow rate can effectively improve the working efficiency of the suction end.

[0068] Preferably, the control module architecture for implementing this negative pressure regulation method is as follows: the flow signal from the liquid flow sensor is processed and sent to the analog-to-digital converter (ADC) module of the microcontroller. The ADC module converts the analog signal into a digital signal, which is then processed. The microcontroller can also receive externally input data. It processes the received data and converts the processing result back into an analog signal via the digital-to-analog converter (DAC). This analog signal is output to the actuator via a relay. The actuator drives the reversing lever to move, thereby achieving flow data acquisition and negative pressure distribution regulation. In terms of programming, the microcontroller first controls the reversing lever to move according to parameter T1 to acquire flow data. The microcontroller then combines the flow data with the data from T2 to calculate the negative pressure time distribution, and then controls the reversing lever to move according to the calculation result to regulate the negative pressure distribution. This control module architecture is a common existing technology in control systems and will not be described in more detail in this invention.

[0069] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described herein. Although the present invention has been described in detail with reference to the above embodiments, the present invention is not limited to the specific embodiments described above. Therefore, any modifications or equivalent substitutions to the present invention, as well as all technical solutions and improvements that do not depart from the spirit and scope of the invention, are covered within the scope of the claims of the present invention.

Claims

1. A saliva suction device for impacted tooth extraction, characterized in that: It includes at least a saliva suction working end and a negative pressure control device; the saliva suction working end is a square tube, and the saliva suction working end includes a first saliva suction part, a second saliva suction part and a third saliva suction part; the first saliva suction part is located on the lingual side of the surgical area; one end of the second saliva suction part is connected to the first saliva suction part, and the second saliva suction part is located on the retromolar pad; the third saliva suction part is connected to the second saliva suction part, and the third saliva suction part is located on the buccal side of the surgical area; The negative pressure control device includes at least a negative pressure adjustment module, a negative pressure input terminal, and a negative pressure output terminal; the negative pressure input terminal is connected to a negative pressure suction head on the dental chair, and the negative pressure output terminal includes a first negative pressure output unit, a second negative pressure output unit, and a third negative pressure output unit; the negative pressure input terminal and the negative pressure output terminal are connected through the negative pressure adjustment module; the negative pressure adjustment module is used to adjust the negative pressure of each negative pressure output unit; The first saliva suction unit, the second saliva suction unit, and the third saliva suction unit each have an independent saliva suction channel; the saliva suction channel of the first saliva suction unit is connected to the first negative pressure output unit; the saliva suction channel of the second saliva suction unit is connected to the second negative pressure output unit; and the saliva suction channel of the third saliva suction unit is connected to the third negative pressure output unit. The second saliva-absorbing part is connected to the first saliva-absorbing part by an "S"-shaped structure; the second saliva-absorbing part is connected to the third saliva-absorbing part by an "S"-shaped structure. Removable elastic pads are provided on the first saliva-absorbing part and the third saliva-absorbing part, respectively; The second suction part includes an alveolar saliva suction head, a transverse suction tube, a left-curved tube, and a right-curved tube; the alveolar saliva suction head includes a bendable corrugated tube and a tapered tube, the alveolar saliva suction head is located in the middle of the transverse suction tube, and the left-curved tube and the right-curved tube are respectively located on both sides of the transverse suction tube; The negative pressure regulating module includes an air inlet, an air outlet, and a reversing rod; the air inlet includes a first air inlet, a second air inlet, and a third air inlet; the first air inlet is connected to the first negative pressure output unit, the second air inlet is connected to the second negative pressure output unit, and the third air inlet is connected to the third negative pressure output unit; the air outlet is connected to the negative pressure input terminal; the reversing rod is disposed between the air outlet and the air inlet, and a through hole is provided on the reversing rod, the through hole including a first through hole and a second through hole; the air outlet and the air inlet are connected through the through hole, and when the first through hole is connected to the first air inlet, the second through hole is outside the third air inlet.

2. The saliva suction device for impacted tooth extraction as described in claim 1, characterized in that: A first liquid flow sensor is installed on the first negative pressure output unit, a second liquid flow sensor is installed on the second negative pressure output unit, and a third liquid flow sensor is installed on the third negative pressure output unit; the negative pressure adjustment module adjusts the negative pressure of each negative pressure output unit according to the liquid flow data collected by each liquid flow sensor.

3. A saliva suction device for impacted tooth extraction as described in claim 2, characterized in that: The first saliva suction unit includes a tongue-side saliva suction head and a tongue-side connecting tube; the third saliva suction unit includes a buccal-side saliva suction head, a buccal-side connecting tube, and an extension tube. The buccal-side saliva suction head is connected to the buccal-side connecting tube and the extension tube on both sides, and the extension tube is connected to the negative pressure output end; the left-bend tube is used to connect to the tongue-side connecting tube; the right-bend tube is used to connect to the buccal-side connecting tube; all components of the saliva suction unit and all saliva suction units are connected by a detachable structure.

4. A saliva suction device for impacted tooth extraction as described in claim 3, characterized in that: The lingual saliva suction head is provided with a lingual saliva suction channel and several lingual saliva suction holes communicating with the lingual saliva suction channel; the transverse saliva suction tube is provided with an alveolar fossa saliva suction channel, which is conductively connected to the alveolar fossa saliva suction head; the transverse saliva suction tube is also provided with a central external channel that is independently connected to the lingual saliva suction channel; the buccal saliva suction head is provided with a buccal saliva suction channel and several buccal saliva suction holes communicating with the buccal saliva suction channel; the buccal saliva suction head is also provided with a buccal external channel that is independently connected to the central external channel, and a buccal central channel that is independently connected to the alveolar fossa saliva suction channel; The extension tube includes three independent saliva suction channels: a first channel, a second channel, and a third channel. The first channel is connected at one end to the outer cheek channel and at the other end to the first negative pressure output unit. The second channel is connected at one end to the middle cheek channel and at the other end to the second negative pressure output unit. The third channel is connected at one end to the cheek-side saliva suction channel and at the other end to the third negative pressure output unit.

5. A method for adjusting the negative pressure of a saliva suction device used in impacted tooth extraction, characterized in that, The negative pressure adjustment method for using a saliva suction device for impacted tooth extraction as described in any one of claims 2-4 is as follows: Step S1: Flow detection; Connect the negative pressure input terminal to the first negative pressure output unit via the reversing rod, and after a time T1, calculate the liquid flow rate a flowing through the first negative pressure output unit within time T1; Connect the negative pressure input terminal to the second negative pressure output unit via the reversing rod, and after a time T1, calculate the liquid flow rate b flowing through the second negative pressure output unit within time T1; Connect the negative pressure input terminal to the third negative pressure output unit via the reversing rod, and after a time T1, calculate the liquid flow rate c flowing through the third negative pressure output unit within time T1. Step S2: Negative pressure maintenance duration allocation; connect the negative pressure input terminal to the first negative pressure output unit through the reversing rod, maintain the first negative pressure duration; connect the negative pressure input terminal to the second negative pressure output unit through the reversing rod, maintain the second negative pressure duration; connect the negative pressure input terminal to the third negative pressure output unit through the reversing rod, maintain the third negative pressure duration. Step S3: After step S2 is completed, start step S1 again until the surgery is finished; The duration of the first negative pressure is set as follows: The second negative pressure duration is set to... The third negative pressure duration is set to .

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