Saliva suction device and dental table
By designing a saliva suction device including a suction head assembly, a suction pipe line, a negative pressure device and a cleaning liquid container, the problem that existing saliva suction devices are difficult to achieve rapid and convenient during the cleaning process is solved, and the rapid and convenient cleaning of the saliva suction device is achieved, simplifying the cleaning process and improving the cleaning efficiency.
Patent Information
- Application Number
- CN202421317366.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-07
- Publication Date
- 2025-05-23
- Estimated Expiration
- 2034-06-07
AI Technical Summary
Existing saliva suction devices are difficult to achieve rapid and convenient during cleaning, and cannot meet the needs of rapid cleaning after dental treatment.
A saliva suction device including a suction head assembly, a suction pipe line, a negative pressure device and a cleaning liquid container is designed. By disassembling the suction head assembly and connecting the cleaning liquid container or an external tap water end, cleaning liquid or tap water is used for rinsing, achieving quick and convenient cleaning.
It realizes rapid and convenient cleaning of saliva suction devices, simplifies the cleaning process, improves cleaning efficiency, and meets the needs of rapid cleaning after dental treatment.
Smart Images

Figure CN222889053U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical equipment, in particular to a saliva suction device and a dental workbench. Background Art
[0002] A saliva suction device is a device used in dental treatment to suck out liquid (saliva, water, blood, etc.) in the mouth through negative pressure. After dental treatment, the used saliva suction device needs to be cleaned, but the current cleaning method cannot meet the requirements of fast and convenient cleaning. Utility Model Content
[0003] The main purpose of the utility model is to provide a saliva suction device, aiming to achieve quick and convenient cleaning.
[0004] To achieve the above-mentioned purpose, the saliva suction device proposed in the utility model comprises a suction head assembly, a suction pipeline, a negative pressure device and a cleaning liquid container; wherein the suction head assembly is used to contact with oral waste water; the first end of the suction pipeline is detachably connected to the suction head assembly, the first end of the suction pipeline is used to connect to an external tap water end, and the second end of the suction pipeline is used to connect to a waste water container; the negative pressure device is connected to the waste water container; the negative pressure device is used to form a negative pressure in the waste water container, so as to suck the oral waste water in contact with the suction head assembly into the waste water container through the suction pipeline; the cleaning liquid container is used to be connected to the first end of the suction pipeline, so as to supply cleaning liquid to the suction pipeline for cleaning.
[0005] In one embodiment, the saliva suction device includes an adapter joint, the first end of the adapter joint constitutes a quick-plug interface, the first end of the suction pipeline is used to be plugged into the first end of the adapter joint, and the second end of the adapter joint is connected to the cleaning liquid container or the external tap water end.
[0006] In one embodiment, a movably connected valve core is provided in the inner cavity of the adapter; when the valve core is in an open position, the inner cavity of the adapter is in a conducting state; when the valve core is in a closed position, the inner cavity of the adapter is in a cut-off state;
[0007] When the first end of the suction pipeline is plugged into the first end of the adapter joint, the first end of the suction pipeline is used to push the valve core to move from the closed position to the open position.
[0008] In one embodiment, the second end of the adapter joint is connected to the cleaning liquid container or the external tap water end through a liquid supply pipeline; the second end of the adapter joint is provided with a first threaded structure, and the middle part of the adapter joint is provided with a second threaded structure; the pipe joint of the liquid supply pipeline is used to lock on the first threaded structure, and the second threaded structure is used to lock on the fixed shell.
[0009] In one embodiment, the saliva suction device further comprises a hanger, the hanger is used to be hung on the fixed shell, and the hanger is provided with a placement slot; the suction head assembly has a holding portion, and the holding portion is used to be snap-fitted in the placement slot.
[0010] In one embodiment, the placement slot is provided with a trigger device, and the trigger device is electrically connected to the negative pressure device; when the state between the trigger device and the holding portion changes from a separated state to a contact state, the trigger device is used to send a closing signal to the negative pressure device; when the state between the trigger device and the holding portion changes from a contact state to a separated state, the trigger device is used to send an opening signal to the negative pressure device; the negative pressure device is used to enter a negative pressure state upon receiving the opening signal, and the negative pressure device is used to exit the negative pressure state upon receiving the closing signal.
[0011] In one embodiment, the negative pressure state includes a standby state and a working state, and the negative pressure device is used to enter the standby state upon receiving the start signal;
[0012] The holding portion is provided with a first switch, and the first switch is connected to the negative pressure device; the first switch is used to send a working signal to the negative pressure device to enable the negative pressure device to enter a working state from a standby state.
[0013] In one embodiment, the trigger device includes an elastic pressing piece, the elastic pressing piece is convexly arranged on the side wall of the card placement slot, and the elastic pressing piece is electrically connected to the negative pressure device;
[0014] When the elastic pressing piece moves from the first preset position to the second preset position under the pressure of the holding part, the elastic pressing piece is used to send the closing signal to the negative pressure device; when the elastic pressing piece moves from the second preset position to the first preset position under the elastic force, the elastic pressing piece is used to send the opening signal to the negative pressure device.
[0015] In one embodiment, the suction head assembly includes a first suction head and a second suction head, and the first suction head and the second suction head are electrically connected to the negative pressure device;
[0016] The first suction head is used to send a strong suction signal to the negative pressure device so that the negative pressure device operates at a first negative pressure power; the second suction head is used to send a weak suction signal to the negative pressure device so that the negative pressure device operates at a second negative pressure power; the first negative pressure power is higher than the second negative pressure power.
[0017] The utility model also provides a dental workbench, which comprises the saliva suction device in the above embodiment.
[0018] The technical solution of the utility model sets the saliva suction device to include a suction head assembly, a suction pipeline, a negative pressure device and a cleaning liquid container; wherein the suction head assembly is used to contact with oral waste water; the first end of the suction pipeline is detachably connected to the suction head assembly, the first end of the suction pipeline is used to connect to an external tap water end, and the second end of the suction pipeline is used to connect to a waste water container; the negative pressure device is connected to the waste water container; the negative pressure device is used to form a negative pressure in the waste water container to suck the oral waste water in contact with the suction head assembly into the waste water container through the suction pipeline; the cleaning liquid container is used to connect to the first end of the suction pipeline to supply cleaning liquid to the suction pipeline for cleaning. With such a configuration, when it is necessary to clean the used saliva suction device, the suction head assembly can be disassembled for cleaning; and for the suction pipeline that is difficult to clean, it can also be connected to a cleaning liquid container or an external tap water end to use the cleaning liquid in the cleaning liquid container or the tap water at the external tap water end to directly rinse it, thereby achieving a quick and convenient cleaning of the saliva suction device. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.
[0020] Figure 1 A schematic diagram of the positional relationship of an embodiment of a saliva suction device provided by the utility model;
[0021] Figure 2 A schematic diagram of the structure of a hanging frame of an embodiment of a saliva suction device provided by the utility model;
[0022] Figure 3 A schematic structural diagram of an adapter joint of an embodiment of a saliva suction device provided by the utility model;
[0023] Figure 4 This is a structural schematic diagram of an embodiment of a dental workbench provided by the utility model.
[0024] Description of Figure Numbers:
[0025] 1. Suction tip assembly; 11. Grip; 12. First suction tip; 13. Second suction tip; 2. Suction pipeline; 3. Negative pressure device; 4. Waste water container; 5. Cleaning liquid container; 6. Adapter; 61. First thread structure; 62. Second thread structure; 7. Hanger; 71. Card slot; 711. Trigger device; 7111. Elastic pressure piece; 100. Dental workbench.
[0026] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION
[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0028] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.
[0029] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.
[0030] The utility model provides a saliva suction device.
[0031] See also Figure 1In one embodiment of the utility model, the saliva suction device includes a suction head assembly 1, a suction pipeline 2, a negative pressure device 3 and a cleaning liquid container 5; wherein the suction head assembly 1 is used to contact with oral waste water; the first end of the suction pipeline 2 is detachably connected to the suction head assembly 1, the first end of the suction pipeline 2 is used to connect to an external tap water end, and the second end of the suction pipeline 2 is used to connect to a waste water container 4; the negative pressure device 3 is connected to the waste water container 4; the negative pressure device 3 is used to form a negative pressure in the waste water container 4, so as to suck the oral waste water in contact with the suction head assembly 1 into the waste water container 4 through the suction pipeline 2; the cleaning liquid container 5 is used to connect the first end of the suction pipeline 2, so as to supply cleaning liquid to the suction pipeline 2 for cleaning. With such a configuration, when it is necessary to clean the used saliva suction device, the suction head assembly 1 can be disassembled for cleaning; and for the suction pipeline 2 that is difficult to clean, it can also be directly rinsed by connecting the cleaning liquid container 5 or the external tap water end, using the cleaning liquid in the cleaning liquid container 5 or the tap water at the external tap water end, thereby achieving a quick and convenient cleaning of the saliva suction device. It can be understood that it can be selected to use the cleaning liquid in the cleaning liquid container for cleaning, or to use the tap water at the external tap water end for cleaning according to actual conditions. For example, in the working space of the saliva suction device, when there is no external tap water end, the cleaning liquid in the cleaning liquid container can be used to achieve quick and convenient cleaning.
[0032] In some embodiments, see Figure 1 and Figure 3 The saliva suction device includes an adapter 6, a first end of the adapter 6 forms a quick-plug interface, a first end of the suction pipeline 2 is used to be plugged into the first end of the adapter 6, and a second end of the adapter 6 is connected to the cleaning liquid container 5. The adapter 6 can be a quick connector, and the quick-plug interface can be a female connector of the quick connector, so that the first end of the suction management can be quickly connected to the first end of the adapter 6. Since the quick connector is a prior art, its working principle is not described in detail here.
[0033] Further, in one embodiment, a movably connected valve core (not shown in the drawings) is provided in the inner cavity of the adapter joint 6; when the valve core is in the open position, the inner cavity of the adapter joint 6 is in a conducting state; when the valve core is in the closed position, the inner cavity of the adapter joint 6 is in a cut-off state; when the first end of the suction pipeline 2 is plugged into the first end of the adapter joint 6, the first end of the suction pipeline 2 is used to push the valve core to move from the closed position to the open position. That is, the arrangement of the valve core can keep the inner cavity of the adapter joint 6 conducting when the first end of the suction pipeline 2 is plugged into the first end of the adapter joint 6, so that the cleaning liquid can flow smoothly to the suction pipeline 2 to clean the suction pipeline 2; and when the first end of the suction pipeline 2 leaves the first end of the adapter joint 6, the valve core is in the closed position, the inner cavity of the adapter joint 6 is in a cut-off state, and the cleaning liquid is stopped by the valve core from flowing into the inner cavity of the adapter joint 6, thereby reducing the risk of leakage of the cleaning liquid. Preferably, an elastic member (not shown in the drawings) may be provided in the inner cavity of the adapter joint 6. When the first end of the suction line 2 leaves the first end of the adapter joint 6, the elastic member may drive the valve core to move from the open position to the closed position under its elastic force. In addition, the provision of the valve core may also prevent external impurities from entering the adapter joint 6 and contaminating the cleaning liquid, or causing blockage in the inner cavity of the adapter joint 6 when the cleaning liquid is not in use.
[0034] In one embodiment, see Figure 3 and Figure 4 , the second end of the adapter joint 6 is connected to the cleaning liquid container 5 through a liquid supply pipeline (not shown in the drawings); the second end of the adapter joint 6 is provided with a first threaded structure 61, and the middle part of the adapter joint 6 is provided with a second threaded structure 62; the pipe joint of the liquid supply pipeline is used to lock on the first threaded structure 61, and the second threaded structure 62 is used to lock on the fixed shell. Usually, pipe joints are provided at both ends of the pipeline that needs to be connected. By locking the pipe joint of the liquid supply pipeline on the first threaded structure 61 of the adapter joint 6, it is helpful to improve the stability of the connection between the two. In order to improve the usability of the saliva suction device, the saliva suction device can be installed on the dental workbench 100. For the adapter joint 6, it can be connected to the fixed shell part of the dental workbench 100; and installing the adapter joint 6 to the fixed shell of the dental workbench 100 through the second threaded structure 62 is a simple installation method.
[0035] In some embodiments, see Figure 2 and Figure 4The saliva suction device also includes a hanger 7, which is used to be hung on a fixed shell, which can be a fixed shell of the dental workbench 100, so that the saliva suction device is integrated into the dental workbench 100 through the hanger 7, which is convenient for medical staff to take and use. The hanger 7 is provided with a placement slot 71; the suction head assembly 1 has a gripping portion 11, which is used to snap-fit into the placement slot 71. The snap-fit arrangement of the placement slot 71 and the gripping portion 11 can, on the one hand, serve to store the suction head assembly 1 when it is idle, and on the other hand, it is easy for medical staff to take it down for use.
[0036] Further, in one embodiment, see Figure 1 and Figure 2 The card slot 71 is provided with a trigger device 711, which is electrically connected to the negative pressure device 3; when the trigger device 711 and the gripping portion 11 change from a separation state to a contact state, the trigger device 711 is used to send a closing signal to the negative pressure device 3; when the trigger device 711 and the gripping portion 11 change from a contact state to a separation state, the trigger device 711 is used to send an opening signal to the negative pressure device 3; the negative pressure device 3 is used to enter a negative pressure state upon receiving an opening signal, and the negative pressure device 3 is used to exit a negative pressure state upon receiving a closing signal. With such a configuration, the suction head assembly 1 can be used whenever you want, which simplifies the operation steps of medical staff.
[0037] In another embodiment, see Figure 1 and Figure 2 , the negative pressure state includes a standby state and a working state, and the negative pressure device 3 is used to enter the standby state when receiving the start signal; the holding portion 11 is provided with a first switch, and the first switch is connected to the negative pressure device 3; the first switch is used to send a working signal to the negative pressure device 3, so that the negative pressure device 3 enters the working state from the standby state. It can be understood that when the suction head assembly 1 is not in use, the simplest operation step is to put the suction head assembly 1 away and turn it off at the same time. Therefore, by setting the trigger device 711 and the holding portion 11 to change from a separation state to a contact state, the trigger device 711 sends a closing signal to the negative pressure device 3, and the negative pressure device 3 exits the negative pressure state in time when receiving the closing signal, the simplest operation can be achieved. When the suction head assembly 1 is needed, there will be a situation where the suction head assembly 1 is picked up, but the suction head assembly 1 is not used temporarily to absorb oral waste water. In order to prevent the suction head assembly 1 from interfering with other operations or absorbing irrelevant impurities in this case, the negative pressure state can be set to include a standby state and a working state on the basis of the above embodiment, and a first switch can be set on the holding portion 11. With such arrangement, the suction head assembly 1 can be placed in a standby state when not in use temporarily, and can be switched to a working state by sending a working signal through the first switch when it is needed.
[0038] In one embodiment, see Figure 1 and Figure 2The trigger device 711 includes an elastic pressing piece 7111, which is protruding from the side wall of the card slot 71 and is electrically connected to the negative pressure device 3; when the elastic pressing piece 7111 moves from the first preset position to the second preset position under the pressure of the holding portion 11, the elastic pressing piece 7111 is used to send a closing signal to the negative pressure device 3; when the elastic pressing piece 7111 moves from the second preset position to the first preset position under the elastic force, the elastic pressing piece 7111 is used to send an opening signal to the negative pressure device 3. It can be understood that in this example, when the suction head assembly 1 is hung on the hanger 7, the holding portion 11 can exert a force on the side wall of the placement slot 71, and the force moves the elastic pressing piece 7111 from the first preset position to the second moving position, that is, the elastic pressing piece 7111 is compressed toward the side wall; when the suction head assembly 1 is removed, the holding portion 11 leaves the placement slot 71, and the force exerted by the holding portion 11 on the elastic pressing piece 7111 gradually disappears, and the elastic pressing piece 7111 returns to the first preset position. When the elastic pressing piece 7111 reaches the second preset position, it triggers the sending of a closing signal; when the elastic pressing piece 7111 reaches the first preset position, it triggers the sending of an opening signal. It should be noted that the elastic pressing piece 7111 and the negative pressure device 3 can also be mechanically connected to send a closing signal or an opening signal. For example, the negative pressure device 3 may be provided with a lever switch, wherein the elastic pressing sheet 7111 and the lever are connected by an elastic rope, and the compression or rebound of the elastic pressing sheet 7111 pulls the lever, thereby controlling the switch of the circuit of the negative pressure device 3 .
[0039] In some embodiments, see Figure 1 , Figure 2 and Figure 4, the suction head assembly 1 of each of the above embodiments further includes a first suction head 12 and a second suction head 13; the first suction head 12 and the second suction head 13 are electrically connected to the negative pressure device 3; the first suction head 12 is used to send a strong suction signal to the negative pressure device 3, so that the negative pressure device 3 operates at a first negative pressure power; the second suction head 13 is used to send a weak suction signal to the negative pressure device 3, so that the negative pressure device 3 operates at a second negative pressure power; the first negative pressure power is higher than the second negative pressure power. It can be understood that the higher the negative pressure power, the stronger its suction effect; that is, the suction effect of the first suction head 12 when working is stronger than the suction effect of the second suction head 13 when working. With such a configuration, the first suction head 12 and the second suction head 13 can be selectively used according to actual conditions; when it is necessary to adapt to a strong suction scene, the first suction head 12 can be used for suction; when it is necessary to adapt to a weak suction scene, the second suction head 13 can be used for suction. Specifically, in one embodiment, the placement slot 71 is used to accommodate the first suction head 12 and the second suction head 13 at the same time; the trigger device 711 is provided with two elastic pressing pieces 7111, which correspond to the first suction head 12 and the second suction head 13 respectively, and the functional relationship between the first suction head 12 and its corresponding elastic pressing piece 7111 is used to send a strong suction signal to enable the negative pressure device 3 to enter / exit the negative pressure state running at the first negative pressure power; the functional relationship between the second suction head 13 and its corresponding elastic pressing piece 7111 is used to send a weak suction signal to enable the negative pressure device 3 to enter / exit the negative pressure state running at the second negative pressure power. In another embodiment, the placement slot 71 includes two independent accommodating chambers, each of which is provided with an independent trigger device 711 and an elastic pressing piece 7111, which correspond to the first suction head 12 and the second suction head 13 respectively. The first suction head 12 and the second suction head 13 interact with their respective corresponding elastic pressing pieces 7111 to enable the negative pressure device 3 to enter / exit the corresponding negative pressure state.
[0040] The utility model also provides a dental workbench 100, such as Figure 4 As shown, the dental workbench 100 includes a saliva suction device of any of the above embodiments, and the specific structure of the saliva suction device refers to the above embodiments. Since the dental workbench 100 adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.
[0041] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.
Claims
1. A saliva suction device, characterized in that: include: A suction tip assembly, the suction tip assembly being used to contact with oral waste water; A suction pipeline, wherein the first end of the suction pipeline is detachably connected to the suction head assembly, the first end of the suction pipeline is used to connect to an external tap water end, and the second end of the suction pipeline is used to connect to a waste water container; A negative pressure device, the negative pressure device is connected to the waste water container; the negative pressure device is used to form a negative pressure in the waste water container, so as to suck the oral waste water in contact with the suction head assembly into the waste water container through the suction pipeline; A cleaning liquid container is used to connect to the first end of the suction pipeline to supply cleaning liquid to the suction pipeline for cleaning.
2. The saliva suction device according to claim 1, characterized in that: The saliva suction device includes an adapter joint, a first end of the adapter joint constitutes a quick-plug interface, a first end of the suction pipeline is used to be plugged into the first end of the adapter joint, and a second end of the adapter joint is connected to the cleaning liquid container or the external tap water end.
3. The saliva suction device according to claim 2, characterized in that: A movably connected valve core is provided in the inner cavity of the adapter joint; when the valve core is in an open position, the inner cavity of the adapter joint is in a conducting state; when the valve core is in a closed position, the inner cavity of the adapter joint is in a cut-off state; When the first end of the suction pipeline is plugged into the first end of the adapter joint, the first end of the suction pipeline is used to push the valve core to move from the closed position to the open position.
4. The saliva suction device according to claim 2, characterized in that: The second end of the adapter joint is connected to the cleaning liquid container or the external tap water end through a liquid supply pipeline; the second end of the adapter joint is provided with a first threaded structure, and the middle part of the adapter joint is provided with a second threaded structure; the pipe joint of the liquid supply pipeline is used to lock on the first threaded structure, and the second threaded structure is used to lock on the fixed shell.
5. The saliva suction device according to claim 1, characterized in that: The saliva suction device also includes a hanger, which is used to be hung on the fixed shell and is provided with a placement slot; the suction head assembly has a holding portion, which is used to be snap-fitted in the placement slot.
6. The saliva suction device according to claim 5, characterized in that The card placement slot is provided with a trigger device, and the trigger device is electrically connected to the negative pressure device; when the state between the trigger device and the holding portion changes from a separation state to a contact state, the trigger device is used to send a closing signal to the negative pressure device; When the state between the trigger device and the holding part changes from a contact state to a separation state, the trigger device is used to send an open signal to the negative pressure device; the negative pressure device is used to enter a negative pressure state upon receiving the open signal, and the negative pressure device is used to exit the negative pressure state upon receiving the close signal.
7. The saliva suction device according to claim 6, characterized in that The negative pressure state includes a standby state and a working state, and the negative pressure device is used to enter the standby state upon receiving the start signal; The holding portion is provided with a first switch, and the first switch is connected to the negative pressure device; the first switch is used to send a working signal to the negative pressure device to enable the negative pressure device to enter a working state from a standby state.
8. The saliva suction device according to claim 6, characterized in that: The trigger device comprises an elastic pressing piece, the elastic pressing piece is convexly arranged on the side wall of the card placement slot, and the elastic pressing piece is electrically connected to the negative pressure device; When the elastic pressing piece moves from the first preset position to the second preset position under the pressure of the holding part, the elastic pressing piece is used to send the closing signal to the negative pressure device; when the elastic pressing piece moves from the second preset position to the first preset position under the elastic force, the elastic pressing piece is used to send the opening signal to the negative pressure device.
9. The saliva suction device according to any one of claims 1 to 8, characterized in that: The suction head assembly comprises a first suction head and a second suction head, wherein the first suction head and the second suction head are electrically connected to the negative pressure device; The first suction head is used to send a strong suction signal to the negative pressure device so that the negative pressure device operates at a first negative pressure power; the second suction head is used to send a weak suction signal to the negative pressure device so that the negative pressure device operates at a second negative pressure power; the first negative pressure power is higher than the second negative pressure power.
10. A dental workbench, characterized in that: The invention comprises a saliva suction device as claimed in any one of claims 1 to 9.