A device for collecting saliva after oral cancer surgery

Abstract

The utility model relates to a kind of for oral cavity cancer postoperative saliva's collection device, including liquid collection component, negative pressure ball, liquid collection bag and drainage component, liquid collection component is adapted to the oral cavity of user, it includes first flexible mouthguard and second flexible mouthguard arranged in upper and lower and the liquid suction part being set between them, liquid suction part side is provided with liquid outlet, the top of negative pressure ball is provided with liquid inlet and vent with liquid outlet intercommunication, its bottom is provided with drain, drainage component is set between negative pressure ball and liquid collection bag, it includes first cylinder and elastic part, can be under the gravity of saliva Automatic switch. The device can efficiently collect saliva, realize automatic drainage, pressure stability, adapt to postoperative oral cavity structure, improve patient convenience and security, reduce medical care burden.

Description

Technical Field

[0001] This utility model relates to the field of postoperative saliva collection technology, specifically to a device for collecting saliva after oral cancer surgery. Background Technology

[0002] Post-operative patients with oral cancer or neurological disorders often experience excessive saliva buildup and frequent leakage due to changes in oral structure, nerve damage, or swallowing dysfunction caused by surgery. This can result in difficulty swallowing saliva or the inability to close the mouth to prevent saliva leakage. Prolonged saliva retention in the mouth can easily lead to complications such as oral infections and angular cheilitis, severely impacting post-operative recovery and quality of life.

[0003] Currently, saliva collection methods for such patients mostly involve patients wiping with tissues or collecting in basins. Wiping with tissues requires frequent operation, which is not only wasteful and economical, but also easily leads to skin damage and infection due to repeated friction around the mouth. While basin collection can temporarily store saliva, it is bulky and inconvenient to carry, and the saliva is directly exposed to the external environment, easily breeding bacteria and increasing the risk of cross-infection. It also greatly restricts the patient's daily activities. Hospitalized patients often rely on central negative pressure suction equipment. However, this equipment has several problems: firstly, the pressure of central negative pressure suction is difficult to control precisely; excessive negative pressure can easily damage surgical wounds in the patient's mouth, leading to bleeding and delaying wound healing; secondly, continuous drooling requires frequent suctioning, increasing the workload of clinical nurses; and thirdly, the equipment has high operating costs, and long-term use will increase the patient's medical expenses.

[0004] Therefore, developing a device that can efficiently collect saliva from the oral cavity, maintain stable negative pressure, and allow for drainage and temporary storage of collected saliva for oral cancer surgery is an urgent problem that needs to be solved. Utility Model Content

[0005] To address the problems existing in the prior art, the purpose of this utility model is to provide a saliva collection device for postoperative oral cancer surgery, including a collection component, a negative pressure bulb, a collection bag, and a drainage component, so as to achieve efficient collection of saliva in the oral cavity, stable negative pressure control, and automatic drainage, reduce the risk of infection and the workload of medical staff, and improve the safety and convenience of patient use.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A device for collecting saliva after oral cancer surgery, comprising:

[0008] A liquid collection assembly is fitted inside the user's mouth. The liquid collection assembly includes a first flexible dental crown and a second flexible dental crown arranged vertically, and a liquid suction part disposed between the first flexible dental crown and the second flexible dental crown. One side of the liquid suction part is provided with a liquid outlet for discharging saliva.

[0009] The negative pressure ball has an inlet at the top connected to the outlet, a vent at the top, and a drain at the bottom.

[0010] A collection bag, the top of which is connected to the drain port of the negative pressure ball, is used to store saliva;

[0011] A drainage assembly is disposed between the negative pressure ball and the collection bag. It includes a first cylinder and an elastic part disposed within the first cylinder. The top of the first cylinder has a drainage inlet connected to the drain port, and the bottom has a drainage outlet connected to the collection bag. The elastic part can open the drainage inlet under the gravity of the saliva and automatically close it when there is no saliva.

[0012] According to one example, the first flexible dental crown includes a first base plate and first side plates extending upward along both sides of the first base plate. The first base plate and the first side plates together form a first liquid collection groove for fitting upper teeth. A plurality of first communication openings are formed on the bottom wall of the first liquid collection groove.

[0013] The second flexible dental crown includes a second base plate and second side plates extending downward along both sides of the second base plate. The second base plate and the second side plates together form a second liquid collection groove for fitting the lower teeth. A plurality of second communication openings are formed on the bottom wall of the second liquid collection groove.

[0014] The liquid absorption section includes an open annular plate and a liquid-absorbing cotton layer housed therein. The liquid outlet is located on the outer wall of the annular plate. The liquid-absorbing cotton layer corresponds to the first connecting port and the second connecting port, respectively, and is used to absorb and collect saliva in the first liquid collection tank and the second liquid collection tank.

[0015] According to one example, the first flexible brace and the second flexible brace are arranged in a mirror orientation.

[0016] According to one example, the vent of the negative pressure ball is provided with a one-way exhaust valve for discharging the gas inside the negative pressure ball to the outside.

[0017] According to one example, the elastic part includes:

[0018] A second cylinder with an open top is coaxially disposed inside the first cylinder, and the second cylinder divides the internal space of the first cylinder into a drainage chamber and a drive chamber;

[0019] A spring, which is vertically installed in the drive chamber and extends upward to a certain height;

[0020] A partition plate is disposed on top of the spring and above the second cylinder. In the first state, the top of the partition plate is sealed and fitted to the drainage inlet, and can be compressed by the pressure of the saliva to move the spring downward to switch to the second state, so that the drainage inlet is connected to the drainage chamber.

[0021] According to one example, the lower circumferential part of the second cylinder is provided with a plurality of support rods, one end of which extends horizontally and is fixed to the inner wall of the first cylinder.

[0022] According to one example, the negative pressure ball is further provided with a pressurizing part on its exterior, which includes:

[0023] First box;

[0024] A second housing detachably connected to the first housing, wherein the first housing and the second housing are configured internally to receive a compression chamber for receiving the negative pressure ball;

[0025] A pair of flexible airbags are respectively disposed on the inner sidewalls of the first box and the second box, and located on both sides of the negative pressure ball.

[0026] According to one example, the flexible airbag includes a plurality of horizontally stacked sheet-like airbags, with adjacent sheet-like airbags communicating with each other, and can expand along the depth direction of the first box or the second box when inflated to compress the negative pressure ball.

[0027] According to one example, one side of the first housing is provided with a plurality of protrusions, and one side of the second housing is provided with a plurality of grooves that mate with the protrusions.

[0028] According to one example, the outer wall of the collection bag is provided with scale lines along its height direction.

[0029] This utility model has the following advantages:

[0030] This invention relates to a saliva collection device for post-oral cancer surgery, comprising a collection component, a negative pressure bulb, a drainage component, and a collection bag, to achieve efficient collection and management of saliva after oral cancer surgery. The collection component consists of a first flexible dental sleeve and a second flexible dental sleeve arranged vertically to fit the upper and lower teeth. Saliva is collected using the first and second collection tanks and their corresponding connecting ports, and quickly gathered with absorbent cotton layers, solving the problems of traditional paper towel wiping causing skin damage and the inconvenience and risk of infection associated with basin collection. The negative pressure bulb, combined with a one-way exhaust valve, creates a stable negative pressure, ensuring continuous saliva intake. The elastic part of the drainage component, through the cooperation of a partition plate and a spring, achieves automatic opening and closing driven by saliva gravity, ensuring smooth drainage of saliva to the collection bag while preventing backflow, thus improving the sealing and safety of the collection process. Attached Figure Description

[0031] Figure 1 This is a three-dimensional structural diagram of the saliva collection device for oral cancer surgery according to this utility model.

[0032] Figure 2 This is a three-dimensional structural diagram of the liquid collection component of this utility model.

[0033] Figure 3 This is a three-dimensional exploded view of the liquid collection component of this utility model.

[0034] Figure 4 This is a three-dimensional structural diagram of the negative pressure ball of this utility model.

[0035] Figure 5 This is a three-dimensional partial sectional view of the drainage component of this utility model.

[0036] Figure 6 This is a cross-sectional view of the drainage component of this utility model.

[0037] Figure 7 This is a three-dimensional structural diagram of the liquid collection bag of this utility model.

[0038] Figure 8 This is a three-dimensional structural diagram of the negative pressure ball with a pressurizing part according to this utility model.

[0039] Figure 9 This is an exploded perspective view of the negative pressure ball with a pressurizing section of this utility model.

[0040] Wherein, 1 is the liquid collection assembly, 101 is the first flexible dental sleeve, 101a is the first base plate, 101b is the first side plate, 101c is the first liquid collection tank, 101d is the first connecting port, 102 is the second flexible dental sleeve, 102a is the second base plate, 102b is the second side plate, 102c is the second connecting port, 103 is the liquid absorption part, 103a is the annular plate, 103b is the liquid absorption cotton layer, 103c is the liquid outlet, 2 is the negative pressure ball, 201 is the liquid inlet, 202 is the vent, 203 is the liquid outlet, 204 is the drainage tube, and 3 is the liquid collection bag. 301 is a scale line, 302 is a liquid collection port, 4 is a drainage assembly, 4a is a drainage chamber, 4b is a drive chamber, 401 is the first cylinder, 401a is the drainage inlet, 401b is the drainage outlet, 402 is the elastic part, 402a is the second cylinder, 402b is a spring, 402c is a partition plate, 402c1 is a sealing plug, 402d is a support rod, 5 is a pressurizing part, 5a is a squeezing chamber, 501 is the first box, 501a is a protrusion, 502 is the second box, 502a is a groove, 503 is a flexible airbag, and 503a is an inflation port. Detailed Implementation

[0041] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0042] Reference Figure 1 The illustration shows an embodiment of a saliva collection device for post-oral cancer surgery. The device adopts a series structure and mainly includes a collection component 1, a negative pressure bulb 2, a drainage component 4, and a collection bag 3 connected in sequence. The collection component 1 is adapted to the inside of the user's mouth and achieves directional collection of saliva by conforming to the teeth and oral mucosa. The negative pressure bulb 2 serves as a power component, which uses its internal negative pressure to draw the saliva collected by the collection component 1 into the bulb for temporary storage. The saliva can be pushed to the downstream drainage component 4 by squeezing. The drainage component 4 automatically opens the channel when saliva flows in, allowing the saliva to flow smoothly to the collection bag 3, and automatically closes to maintain a seal when no saliva passes through, effectively preventing the liquid in the collection bag 3 from flowing back or contaminating the external environment.

[0043] Reference Figure 2 and Figure 3The saliva collection component 1 is designed for single use and can be discarded after use. It is fitted inside the user's mouth and is detachably connected to the inlet 201 of the negative pressure bulb 2 via a flexible drainage tube 204. The saliva collection component 1 includes a first flexible dental sleeve 101 and a second flexible dental sleeve 102 arranged opposite each other. Both are U-shaped to fit the dentition and are mirror-symmetrically distributed. The first flexible dental sleeve 101 corresponds to the upper teeth, and the second flexible dental sleeve 102 corresponds to the lower teeth, achieving directional saliva collection by conforming to the tooth surface. The flexible dental sleeves are made of medical-grade silicone, utilizing their elastic deformation to form a tight fit with the teeth and gums, preventing saliva leakage from gaps and reducing irritation to oral tissues.

[0044] The first flexible dental brace 101 includes an arc-shaped first base plate 101a and first side plates 101b extending vertically upward along both sides of the first base plate 101a. The first base plate 101a and the first side plates 101b together form a first saliva collection groove 101c that fits onto the upper teeth. The bottom wall of the first saliva collection groove 101c is provided with a plurality of first connecting ports 101d for guiding the saliva collected in the first saliva collection groove 101c into the suction part 103.

[0045] The second flexible dental crown 102 has a structure that is roughly the same as the first flexible dental crown 101. It includes an arc-shaped second base plate 102a and second side plates 102b extending downward along both sides of the second base plate 102a. The second base plate 102a and the two side plates 102b together form a second liquid collection groove that fits onto the lower teeth. The bottom wall of the second liquid collection groove is provided with a plurality of second connecting ports 102c. The curvature of the first liquid collection groove 101c and the second liquid collection groove matches the curve of the human dental arch. The shape of the first connecting port 101d and the second connecting port 102c can be set to a circle, an ellipse, a square or a triangle, etc., as required.

[0046] Continue to refer to Figure 3 The first flexible dental brace 101 and the second flexible dental brace 102 are connected together by a liquid-absorbing part 103. The liquid-absorbing part 103 includes an open annular plate 103a and a liquid-absorbing cotton layer 103b filled inside the annular plate 103a. The top of the annular plate 103a is sealed to the bottom end of the first side plate 101b of the first flexible dental brace 101, and its bottom is sealed to the top end of the second side plate 102b of the second flexible dental brace 102, forming a closed liquid-absorbing interlayer. The annular plate 103a has a liquid outlet 103c on its outer wall near the opening end of the oral cavity. The liquid outlet 103c is connected to the negative pressure bulb 2 through a flexible drainage tube 204.

[0047] The absorbent cotton layer 103b is made of highly absorbent medical absorbent cotton or hydrophilic sponge. Its upper and lower surfaces are in contact with the outlet ends of the first connecting port 101d and the second connecting port 102c, respectively. When saliva in the first collecting tank 101c and the second collecting tank seeps out through the first connecting port 101d and the second connecting port 102c, the absorbent cotton layer 103b quickly absorbs the saliva and gathers it towards the center, finally flowing into the negative pressure ball 2 through the outlet 103c. To improve the absorption efficiency, the aperture of the first connecting port 101d and the second connecting port 102c can be matched with the cross-sectional size of the corresponding teeth, forming a one-to-one correspondence, so that the tooth end face is in direct contact with the absorbent cotton layer 103b, reducing the retention of saliva in the collecting tank.

[0048] In an embodiment not shown, an arc-shaped patch is fitted on the drainage tube 204 near the outlet 103c. The patch is made of medical silicone and its curvature matches the curve from the corner of the user's mouth to the edge of the lips. The arc-shaped patch is fitted on the drainage tube 204. After the collection component 1 is inserted into the oral cavity, the arc-shaped patch is adjusted to fit the outer side of the lips so that its inner side is in close contact with the skin around the mouth, forming a sealing part around the oral cavity opening.

[0049] Reference Figure 1 and Figure 4 The negative pressure ball 2 has an elliptical cross-section and is vertically arranged, possessing compressible and repositionable elasticity. Its top has an inlet 201 connected to an outlet 103c via a drainage tube 204, used to receive saliva collected by the suction section 103. An air vent 202 is also located at the top, equipped with a one-way exhaust valve. This valve allows only the internal gas of the negative pressure ball 2 to escape, preventing external gas from entering the ball through the air vent 202. When the negative pressure ball 2 is squeezed, the internal pressure increases, and the gas is discharged through the one-way exhaust valve. After being released, the ball elastically returns to its original position, creating a negative pressure inside. This negative pressure draws in the saliva from the collection assembly 1 through the inlet 201, achieving continuous collection. The bottom of the negative pressure ball 2 has a drain 203 connected to the drainage inlet 401a of the drainage assembly 4 via a rigid tube, used to push the temporarily stored saliva inside the ball to the drainage assembly 4 under pressure.

[0050] The compression of the negative pressure ball 2 can be achieved through manual compression or by externally configuring the pressure unit 5. Figure 8 and Figure 9An embodiment of the external configuration of the negative pressure ball 2 with a pressurizing part 5 is shown. As shown in the figure, the external configuration of the negative pressure ball 2 with a pressurizing part 5 mainly includes a first housing 501, a second housing 502 and a pair of flexible airbags 503. The first housing 501 and the second housing 502 are detachably connected, and the first housing 501 and the second housing 502 are configured internally to form a compression chamber 5a for receiving the negative pressure ball 2, so that the negative pressure ball 2 can be sealed and wrapped in the chamber, with only the connection ends of the liquid inlet 201, the liquid outlet 203 and the air vent 202 exposed.

[0051] A pair of flexible airbags 503 are respectively disposed on the inner sidewalls of the first housing 501 and the second housing 502, and located on both sides of the negative pressure ball 2. One side of each flexible airbag 503 has an inflation tube. The free end of the inflation tube passes through the inflation port 503a on the sidewall of the first housing 501 or the second housing 502 and extends to the outside. Its end is connected to an external inflation device, such as a miniature manual air pump or an electric air pump, for inflating or deflating gas into the flexible airbag 503. The flexible airbag 503 includes multiple sheet-like airbags stacked horizontally. Adjacent sheet-like airbags are interconnected. The size of the sheet-like airbags is approximately the same as the internal cross-sectional size of the first housing 501 or the second housing 502, so that they can fit against the inner wall of the housing when not inflated and expand synchronously along the depth direction of the housing when inflated. When the inflation device supplies air to the flexible airbag 503, the multi-layer sheet-like airbags inflate sequentially toward the negative pressure ball 2. Through large-area contact and uniform compression of the two side walls of the negative pressure ball 2, a stable negative pressure is generated inside the ball. By adjusting the inflation pressure, the compression amount of the negative pressure ball 2 can be controlled, thereby achieving stable adjustment of the negative pressure output.

[0052] Reference Figure 9 The first housing 501 and the second housing 502 are detachably connected by the cooperation of protrusions 501a and grooves 502a. The first housing 501 has a plurality of protrusions 501a on one side, and the number of protrusions 501a is four. The four protrusions 501a are located at the four corners of the opening end of the first housing 501. The second housing 502 has a plurality of grooves 502a on one side that cooperate with the protrusions 501a. The number of grooves 502a is four. The four grooves 502a are located at the four corners of the opening end of the second housing 502, corresponding to the protrusions 501a.

[0053] Reference Figure 1 and Figure 7 The top of the collection bag 3 is connected to the drain port 203 of the negative pressure bulb 2, and is used to store saliva. A collection port 302 is provided on its top. The collection bag 3 is made of transparent material, and its outer wall is provided with scale lines 301 along the height direction, which can be used to assess the patient's saliva secretion, judge the recovery status of the condition, etc.

[0054] Reference Figure 1 ,5 The drainage component 4 is positioned between the negative pressure ball 2 and the collection bag 3, serving as a one-way flow and automatic switch. It includes a first cylindrical body 401 and an elastic part 402 within the first cylindrical body 401. The first cylindrical body 401 is cylindrical, with a drainage inlet 401a at its top connected to a drain outlet 203. The drainage inlet 401a is connected to the drain outlet 203 at the bottom of the negative pressure ball 2 via a rigid pipe, allowing the negative pressure ball 2 and the first cylindrical body 401 to be arranged vertically, utilizing gravity to promote natural saliva flow. The bottom of the first cylindrical body 401 has a drainage outlet 401b connected to the collection bag 3. The elastic part 402 can open the drainage inlet 401a under the gravity of the saliva and automatically close it when there is no saliva.

[0055] Continue to refer to Figure 5 and Figure 6 The elastic part 402 includes a second cylinder 402a, a spring 402b, and a partition plate 402c. The top of the second cylinder 402a is open and coaxially disposed inside the first cylinder 401. The second cylinder 402a divides the internal space of the first cylinder 401 into a drainage chamber 4a and a drive chamber 4b, which are arranged internally and externally. A plurality of support rods 402d are circumferentially disposed on the lower part of the second cylinder 402a. One end of each support rod 402d extends horizontally and is fixed to the inner wall of the first cylinder 401 to fix the position of the second cylinder 402a.

[0056] The spring 402b is vertically positioned within the drive chamber 4b, its bottom end connected to the inner wall of the bottom of the second cylinder 402a, and its top end extending upwards above the open opening at the top of the second cylinder 402a. The partition plate 402c is a flat plate structure, positioned above the spring 402b and above the second cylinder 402a. The diameter of the partition plate 402c is larger than the outer diameter of the second cylinder 402a. A flow gap exists between the partition plate 402c and the inner wall of the first cylinder 401 to ensure that the partition plate 402c can slide up and down along the inner wall of the first cylinder 401 while preventing saliva from entering the drive chamber 4b. The upper part of the partition plate 402c also has a sealing plug 402c1, the shape of which matches the drainage inlet 401a to seal the drainage inlet 401a. Furthermore, the upper surface of the partition plate 402c has an annular inclined surface that slopes towards the drainage chamber 4a to improve saliva drainage.

[0057] In the first state, the top of the partition plate 402c is sealed and fitted with the drainage inlet 401a. Under the pressure of saliva, it can compress the spring 402b and move downwards to switch to the second state, connecting the drainage inlet 401a with the drainage chamber 4a. In the first state, which is a closed state, when no saliva flows in, the spring 402b is in a naturally extended state, pushing the partition plate 402c upwards. This causes the top surface of the partition plate 402c to fit tightly against the lower surface of the drainage inlet 401a, achieving a seal through surface contact and blocking the connection between the drainage inlet 401a and the drainage chamber 4a. The second state is the conducting state. When saliva in the negative pressure bulb 2 flows into the drainage inlet 401a through the drain outlet 203, the gravity and pressure of the saliva act together on the separator 402c, overcoming the elastic force of the spring 402b, causing the separator 402c to move downward and compress the spring 402b. At this time, a gap is formed between the drainage inlet 401a and the separator 402c, and the saliva enters the drainage chamber 4a through the flow gap, and finally flows into the collection bag 3 through the drainage outlet 401b. When there is no saliva, the spring 402b resets and pushes the separator 402c upward, returning to the closed state.

[0058] In an embodiment not shown, the inner wall of the drainage chamber 4a is provided with an annular filter screen to intercept large particulate impurities such as food residue or oral tissue that may be present in the saliva, preventing them from entering the collection bag 3.

[0059] In an embodiment not shown, the bottom surface of the partition plate 402c is provided with a plurality of guide rods along the circumferential direction, and the top surface of the second cylinder 402a is provided with a plurality of guide grooves along the circumferential direction. The guide rods and the guide grooves form a sliding fit. This arrangement can limit the circumferential rotation of the partition plate 402c and ensure the stability of the partition plate 402c's vertical movement.

[0060] In an embodiment not shown, the first cylinder 401 adopts a split structure, which facilitates the disassembly, cleaning and internal maintenance of the drainage component 4. Specifically, the first cylinder 401 includes a pair of symmetrical arc-shaped shells, each arc-shaped shell having a semi-circular cross-section, and a sealing ring is provided at the connection between the two arc-shaped shells.

[0061] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention should be considered equivalent substitutions and are included within the protection scope of the present invention. The embodiments described in this disclosure are intended as non-limiting examples, and other embodiments may take various and alternative forms. Furthermore, the drawings are not necessarily to scale and may present simplified expressions of various features of the present disclosure, including, for example, specific dimensions, orientations, positions, and shapes. Details associated with such features will be determined in part by the intended application and usage environment of the described embodiments.

[0062] The detailed description and accompanying drawings are supporting and descriptive of this teaching, but the scope of this teaching is defined only by the claims. While the best mode and some other embodiments for carrying out this teaching have been described in detail, various alternative designs and embodiments exist for practicing the teaching as defined in the appended claims. Furthermore, this disclosure expressly includes combinations and sub-combinations of the elements and features set forth above and below.

Claims

1. A device for collecting saliva after oral cancer surgery, characterized in that, include: A liquid collection assembly is fitted inside the user's mouth. The liquid collection assembly includes a first flexible dental crown and a second flexible dental crown arranged vertically, and a liquid suction part disposed between the first flexible dental crown and the second flexible dental crown. One side of the liquid suction part is provided with a liquid outlet for discharging saliva. The negative pressure ball has an inlet at the top connected to the outlet, a vent at the top, and a drain at the bottom. A collection bag, the top of which is connected to the drain port of the negative pressure ball, is used to store saliva; A drainage assembly is disposed between the negative pressure ball and the collection bag. It includes a first cylinder and an elastic part disposed within the first cylinder. The top of the first cylinder has a drainage inlet connected to the drain port, and the bottom has a drainage outlet connected to the collection bag. The elastic part can open the drainage inlet under the gravity of the saliva and automatically close it when there is no saliva.

2. The collecting device according to claim 1, characterized in that, The first flexible dental crown includes a first base plate and first side plates extending upward along both sides of the first base plate. The first base plate and the first side plates together form a first liquid collection groove for fitting the upper teeth. A plurality of first communication openings are formed on the bottom wall of the first liquid collection groove. The second flexible dental crown includes a second base plate and second side plates extending downward along both sides of the second base plate. The second base plate and the second side plates together form a second liquid collection groove for fitting the lower teeth. A plurality of second communication openings are formed on the bottom wall of the second liquid collection groove. The liquid absorption section includes an open annular plate and a liquid-absorbing cotton layer housed therein. The liquid outlet is located on the outer wall of the annular plate. The liquid-absorbing cotton layer corresponds to the first connecting port and the second connecting port, respectively, and is used to absorb and collect saliva in the first liquid collection tank and the second liquid collection tank.

3. The collecting device according to claim 2, characterized in that, The first flexible dental brace and the second flexible dental brace are arranged in a mirror orientation.

4. The collecting device according to claim 1, characterized in that, The vent of the negative pressure ball is equipped with a one-way exhaust valve for discharging the gas inside the negative pressure ball to the outside.

5. The collecting device according to claim 1, characterized in that, The elastic portion includes: A second cylinder with an open top is coaxially disposed inside the first cylinder, and the second cylinder divides the internal space of the first cylinder into a drainage chamber and a drive chamber; A spring, which is vertically installed in the drive chamber and extends upward to a certain height; A partition plate is disposed on top of the spring and above the second cylinder. In the first state, the top of the partition plate is sealed and fitted to the drainage inlet, and can be compressed by the pressure of the saliva to move the spring downward to switch to the second state, so that the drainage inlet is connected to the drainage chamber.

6. The collecting device according to claim 5, characterized in that, The lower part of the second cylinder is provided with a plurality of support rods, one end of which extends horizontally and is fixed to the inner wall of the first cylinder.

7. The collecting device according to claim 1, characterized in that, The negative pressure ball is further provided with a pressurizing part on its exterior, which includes: First box; A second housing detachably connected to the first housing, wherein the first housing and the second housing are configured internally to receive a compression chamber for receiving the negative pressure ball; A pair of flexible airbags are respectively disposed on the inner sidewalls of the first box and the second box, and located on both sides of the negative pressure ball.

8. The collecting device according to claim 7, characterized in that, The flexible airbag includes multiple sheet-like airbags stacked horizontally, with adjacent sheet-like airbags interconnected. When inflated, it can expand along the depth direction of the first box or the second box to compress the negative pressure ball.

9. The collecting device according to claim 7, characterized in that, The first box has multiple protrusions on one side, and the second box has multiple grooves on one side that mate with the protrusions.

10. The collecting device according to claim 1, characterized in that, The outer wall of the liquid collection bag is provided with scale lines along its height direction.

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