Continuous low-pressure sputum suction device

Abstract

The invention provides a continuous low-pressure sputum suction device which comprises a bottom plate, a mounting plate is arranged on the upper side of the bottom plate, a sputum suction apparatus is arranged at the upper end of the mounting plate, a lifting assembly is arranged between the mounting plate and the bottom plate and comprises a first sliding groove formed in the bottom plate, and a two-way lead screw is rotationally arranged in the first sliding groove; according to the continuous low-pressure sputum suction device, by arranging the rotating plates and the sliding blocks to move relatively, the rotating plates rotate, the rotating plates rotate to drive the mounting plate to move up and down, the sputum suction efficiency is improved, the sputum suction efficiency is improved, and the sputum suction efficiency is improved. The height of the sputum aspirator and the height of the collecting bottle are adjusted, the adjustable height allows medical staff to accurately place the collecting bottle at a safe low position according to the bed height of a patient, the body position of the patient and the intubation position, and the sputum aspiration efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the technical field of suction devices, and specifically relates to a continuous low-pressure suction device. Background Technology

[0002] Under normal circumstances, the respiratory tract pushes sputum and foreign objects upward to the pharynx through ciliary movement and cough reflex, and then swallows or coughs them up. When a patient has impaired consciousness, the ability to expel sputum spontaneously is lost or weakened. Using a suction device can keep the airway open, prevent suffocation, and clear sputum, blood, vomit or secretions from the mouth, throat and trachea, and prevent large sputum plugs from completely blocking the main airway. Therefore, it is necessary to use a suction device to suction sputum from patients.

[0003] Most existing suction devices consist of a suction device detachably mounted on the side wall of a support plate, which collects sputum. However, in this method, the suction device is bolted to the support plate, and the side wall of the support plate has several connection holes. When the height of the suction device needs to be adjusted, the operator needs to fix the bolts to different connection holes. The connection holes are spaced apart, which prevents continuous height adjustment of the suction device and limits its range of motion. The connection holes are usually arranged at fixed intervals, which means that the suction device can only switch between a limited number of discrete heights. In clinical practice, the ideal height is often between two holes, which may cause the suction tubing to be forced to be excessively bent or stretched, increasing tubing resistance, reducing suction efficiency, and posing a risk of accidental traction to intubated patients. Summary of the Invention

[0004] In view of this, the present invention addresses the shortcomings of the prior art by providing a continuous low-pressure suction device. By setting a rotating plate and moving the slider relative to each other, the rotating plate rotates. The rotation of the rotating plate causes the mounting plate to move up and down, thereby adjusting the height of the suction device and the collection bottle. The adjustable height allows medical staff to accurately place the collection bottle in a safe low position according to the patient's bed height, patient position, and intubation position, thereby improving suction efficiency.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a continuous low-pressure suction device, including a base plate, an mounting plate provided on the upper side of the base plate, a suction device provided on the upper end of the mounting plate, a lifting assembly provided between the mounting plate and the base plate, the lifting assembly including a slide groove first opened on the base plate, a bidirectional lead screw rotatably provided inside the slide groove first, sliders symmetrically provided at both ends of the bidirectional lead screw, the sliders being threadedly connected to the bidirectional lead screw, a rotating plate rotatably provided on the upper end of each slider, the end of the rotating plate away from the slider being rotatably connected to the bottom of the mounting plate, and a driving component for driving the bidirectional lead screw to rotate provided on the left end of the base plate.

[0006] As a further improvement of the present invention, the driving component includes a protective box disposed at the left end of the base plate, and a motor is disposed inside the protective box. The output end of the motor is connected to the threaded rod through a coupling.

[0007] As a further improvement of the present invention, a suction device is provided at the upper end of the mounting plate, a mounting box is provided at the left end of the suction device, a collection bottle is provided inside the mounting box, a clip is provided in the middle of the mounting box, and fasteners for fixing the collection bottle are provided at both the front and rear ends of the mounting box.

[0008] As a further improvement of the present invention, the fixing member includes a fixing frame disposed on the mounting box, a sliding plate is slidably disposed inside the fixing frame, an insertion block is disposed at one end of the sliding plate near the collection bottle, and a slot adapted to the insertion block is provided on the side wall of the collection bottle.

[0009] As a further improvement of the present invention, a plurality of springs are provided between the slide plate and the fixed frame, a pull rod is provided at one end of the slide plate, a pull ring is provided on the outside of the fixed frame, and the pull rod is slidably connected to the fixed frame.

[0010] As a further improvement of the present invention, the upper left end of the collection bottle is connected to a suction tube, the right end of the collection bottle is connected to a connecting tube, a filter box is provided on the upper left side of the suction device, the connecting tube is connected to one end of the filter box, and the other end of the filter box is connected to the suction device through a negative pressure tube.

[0011] As a further improvement of the present invention, the filter box is symmetrically provided with mounting grooves inside, and a filter plate is connected between the two mounting grooves. The filter box is symmetrically provided with sliding grooves on the left side inside, and sliding rods are provided inside the sliding grooves. A movable plate is slidably provided between the two sliding rods. A brush plate is provided on the side wall of the movable plate, and one end of the brush plate abuts against the filter plate. A telescopic push rod is provided at the upper end of the filter box, and the telescopic end of the telescopic push rod extends to the lower end of the filter box and connects with the upper side wall of the movable plate.

[0012] As a further improvement of the present invention, the upper end of the suction device is provided with a handle, the front end of the suction device is provided with a vacuum gauge for observation, and the side of the suction device is fixedly installed with a knob for adjustment.

[0013] As a further improvement of the present invention, a number of telescopic rods are provided between the base plate and the mounting plate.

[0014] As a further improvement of the present invention, the lower end of the base plate is provided with several casters, and each caster is provided with a brake pad.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: Firstly, by setting up a rotating plate, the slider moves relative to the plate, causing the plate to rotate. This rotation moves the mounting plate up and down, which in turn adjusts the height of the suction device and the collection bottle. To prevent suctioned sputum from flowing back into the patient's airway due to pressure fluctuations or changes in body position, the collection bottle must always be positioned below the opening of the endotracheal tube / tracheostomy tube. The adjustable height allows medical staff to accurately place the collection bottle in a safe, low position (usually 10–20 cm below the chest cavity level) based on: the patient's bed height (adjustable 50–90 cm); the patient's position (supine / 30° semi-recumbent); and the tube position (high neck vs. suprasternal notch). If the collection bottle is higher than the airway, even with negative pressure, fatal reflux aspiration can easily occur if the machine is stopped or the pressure becomes unbalanced.

[0016] Secondly, by setting a fixing component, the collection bottle can be disassembled and replaced. Continuous low-pressure suctioning requires uninterrupted drainage, but the collection bottle must be replaced in time when it is full. If traditional screw tightening, clamps or bolts are used for fixing, the replacement takes more than 30 seconds, requires two hands to operate, and even requires the use of tools. The suctioning process is forced to be interrupted, increasing the risk of sputum accumulation. The quick-release design can complete the replacement within 3-5 seconds, with almost no interruption of negative pressure, improving the efficiency of sputum suction.

[0017] Third, by setting up a filter plate, the suctioned sputum contains a large number of bacteria and viruses (such as influenza virus, COVID-19, tuberculosis bacillus, etc.). The filter plate (usually a hydrophobic microporous membrane with a pore size ≤0.2 μm) can intercept ≥99.9% of microbial aerosols, preventing pathogens from escaping into the environment or entering the suction unit through the negative pressure pipeline, protecting medical staff, other patients and the public suction system, and meeting the core requirements of hospital infection control.

[0018] Fourth, by setting up a brush plate, medical high-efficiency filters have a high unit price. For patients who need long-term sputum suction (such as tracheotomy home care), they consume 1-2 filters per day, resulting in high annual costs. The cleanable design allows the same filter plate to be used multiple times, greatly reducing consumable expenses, especially benefiting primary hospitals and home users. If the filter plate is blocked by thick sputum, the traditional method requires stopping the machine to replace it, while the built-in cleaning component can quickly clear the blockage without disassembly, restoring ventilation efficiency and avoiding interruption of suction. It is particularly suitable for continuous low-pressure long-term sputum suction scenarios.

[0019] Fifth, by setting brake pads, if the equipment slips during use, it will cause the suction tube to be pulled, which may lead to displacement of the endotracheal tube or damage to the mucosa. The brake pads can lock the rotation and direction of the wheels at the same time, so that the equipment forms a "rigid connection" with the ground, which meets the stringent requirements of precision operation for static stability. Attached Figure Description

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0021] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the lifting component structure of the present invention; Figure 3 This is a schematic diagram of the fastener structure of the present invention; Figure 4 This is a schematic diagram of the brush plate, telescopic push rod, and movable plate structure of the present invention; Figure 5 This is a front view structural diagram of the present invention.

[0022] In the diagram: 101, base plate; 102, mounting plate; 104, double-acting lead screw; 105, slider; 106, rotating plate; 107, protective box; 108, motor; 201, suction device; 202, mounting box; 203, collection bottle; 204, clamp; 205, fixing frame; 206, sliding plate; 207, insert block; 208, slot; 209, spring; 210, pull rod; 211, pull ring; 301, suction tube; 302, connecting pipe; 303, filter box; 304, filter plate; 305, sliding rod; 306, moving plate; 307, brush plate; 308, telescopic push rod; 309, telescopic rod; 310, caster wheel. Detailed Implementation

[0023] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] like Figure 1 , 2 As shown in Figure 3, a continuous low-pressure suction device includes a base plate 101, an mounting plate 102 is provided on the upper side of the base plate 101, a suction device 201 is provided at the upper end of the mounting plate 102, a lifting assembly is provided between the mounting plate 102 and the base plate 101, the lifting assembly includes a slide groove 1 opened on the base plate 101, a bidirectional lead screw 104 is rotatably provided inside the slide groove 1, sliders 105 are symmetrically provided at both ends of the bidirectional lead screw 104, the sliders 105 are threadedly connected to the bidirectional lead screw 104, a rotating plate 106 is rotatably provided at the upper end of each slider 105, and the end of the rotating plate 106 away from the slider 105 is rotatably connected to the bottom of the mounting plate 102, and a driving component for driving the bidirectional lead screw 104 to rotate is provided at the left end of the base plate 101.

[0025] like Figure 2As shown, the driving component includes a protective box 107 located at the left end of the base plate 101. A motor 108 is housed inside the protective box 107. The output end of the motor 108 is connected to a threaded rod via a coupling. When the motor 108 is started, its output end drives a bidirectional lead screw 104 to rotate. The bidirectional lead screw 104 drives a slider 105 to move in the opposite direction, thereby causing the rotating plate 106 to rotate. The rotation of the rotating plate 106 causes the mounting plate 102 to move up and down, thereby adjusting the height of the suction device 201 and the collection bottle 203. To prevent the suctioned sputum from flowing back into the patient's airway due to pressure fluctuations or changes in body position, the collection bottle 203 must always be positioned below the opening of the endotracheal tube / tracheostomy cannula. The adjustable height allows medical staff to adjust the height according to: patient bed height (50–90 cm adjustable); patient position (supine / 30° semi-recumbent); and tube position (high neck vs. suprasternal notch). Precisely place the collection bottle 203 in a safe low position (usually 10–20 cm below the level of the chest cavity). If the collection bottle 203 is higher than the airway, even with negative pressure, fatal reflux aspiration can easily occur once the machine is stopped or the pressure is unbalanced.

[0026] At the same time, it can reduce the bends in the tubing and maintain the stability of continuous low pressure. Continuous low pressure suctioning relies on a stable and low-resistance airflow channel. When the height is not adjustable, the connecting tube 302 is often forced to be folded, hang or tightened. After adjusting the height, a natural downward arc can be formed between the suction tube 301 → collection bottle 203 → suction device, without sharp angle bends.

[0027] like Figure 1 , 5 As shown, a suction device 201 is provided at the upper end of the mounting plate 102, a mounting box 202 is provided at the left end of the suction device 201, a collection bottle 203 is provided inside the mounting box 202, a clip 204 is provided in the middle of the mounting box 202, and fasteners for fixing the collection bottle 203 are provided at both the front and rear ends of the mounting box 202.

[0028] like Figure 3As shown, the fixing component includes a fixing frame 205 mounted on the mounting box 202. A sliding plate 206 is slidably mounted inside the fixing frame 205. An insertion block 207 is provided at one end of the sliding plate 206 near the collection bottle 203. A slot 208 adapted to the insertion block 207 is provided on the side wall of the collection bottle 203. Several springs 209 are provided between the sliding plate 206 and the fixing frame 205. A pull rod 210 is provided at one end of the sliding plate 206. A pull ring 211 is provided on the outside of the fixing frame 205, and the pull rod 210 is slidably connected to the fixing frame 205. When it is necessary to remove the collection bottle 203, the pull ring 211 is pulled towards both ends of the fixing frame 205. The pull ring 211 drives the pull rod 210 to move, which in turn drives the sliding plate 206 to compress the springs 209. The pull plate drives the insertion block 207 to move, causing it to disengage from the slot 208 on the collection bottle 203, thereby allowing the collection bottle 203 to be removed. The collection bottle 203 is removed. When it is necessary to fix the collection bottle 203, it is moved into the installation box 202. During the movement, the pull ring 211 is pulled, which drives the insertion block 207 to move through the pull rod 210 and the slider 105. The side wall of the insertion block 207 abuts against the side wall of the collection bottle 203. The collection bottle 203 is moved into the installation box 202 until the insertion block 207 is inserted into the slot 208 under the action of the spring 209. Then the collection bottle 203 can be re-fixed. Continuous low-pressure suction requires uninterrupted drainage, but the collection bottle 203 must be replaced in time when it is full. If traditional screw tightening, clamp or bolt fixing is used: replacement takes more than 30 seconds, requires two hands to operate, and even requires the use of tools. The suction process is forced to be interrupted, which increases the risk of sputum accumulation. The quick-release design can complete the replacement within 3-5 seconds, with almost no interruption of negative pressure, and improves the suction efficiency.

[0029] like Figure 1 , 5 As shown, the upper left end of the collection bottle 203 is connected to the suction tube 301, and the right end of the collection bottle 203 is connected to the connecting tube 302. The upper left end of the suction device 201 is provided with a filter box 303. The connecting tube 302 is connected to one end of the filter box 303, and the other end of the filter box 303 is connected to the suction device 201 through a negative pressure tube.

[0030] like Figure 4As shown, the filter box 303 has symmetrically arranged mounting slots inside, and a filter plate 304 is connected between the two mounting slots. The suctioned sputum contains a large number of bacteria and viruses (such as influenza virus, COVID-19 virus, tuberculosis bacillus, etc.), and the filter plate 304 (usually a hydrophobic microporous membrane with a pore size ≤0.2 μm) can retain ≥99.9% of them. The microbial aerosol prevents pathogens from escaping into the environment or entering the suction unit through the negative pressure pipeline, protecting medical staff, other patients, and the public suction system, meeting the core requirements of hospital infection control. Meanwhile, even with an anti-overflow design, backflow can still occur in the event of a sudden power outage, tipping, or overflow. The filter plate 304 acts as the final barrier, allowing gas to pass through while blocking liquids and solid particles, preventing corrosion, blockage, or damage to the expensive electric suction pump. The filter box 303 has two symmetrically arranged sliding grooves on its left side, each containing a sliding rod 305. A movable plate 306 slides between the two sliding rods 305. A brush plate 307 is installed on the side wall of the movable plate 306, with one end of the brush plate 307 contacting the filter plate 304. A telescopic push rod 308 is located at the top of the filter box 303. The telescopic end extends to the lower end of the filter box 303 and connects to the upper side wall of the moving plate 306. Activating the telescopic push rod 308 causes the moving plate 306 to move along the slide rod 305. The moving plate 306 then moves the brush plate 307, which in turn cleans the filter plate 304. Medical high-efficiency filters are expensive, and for patients requiring long-term suction (such as those undergoing tracheotomy home care), 1-2 filters are consumed daily, resulting in high annual costs. The cleanable design allows the same filter plate 304 to be used multiple times, significantly reducing consumable expenses, especially benefiting primary hospitals and home users. If the filter plate 304 is blocked by thick sputum, traditional methods require stopping the machine for replacement. However, the built-in cleaning component can quickly clear the blockage without disassembly, restoring ventilation efficiency and preventing interruption of suction. This is particularly suitable for continuous low-pressure, long-term suction scenarios.

[0031] like Figure 1 , 5 As shown, the suction device 201 has a handle at the top, a vacuum gauge for observation at the front end, and an adjustment knob fixedly installed on the side.

[0032] like Figure 1 , 5 As shown, the lower end of the base plate 101 is equipped with several casters 310. The casters 310 allow the equipment to easily bypass beds, instruments, and obstacles, and to flexibly turn in narrow spaces (such as ICU and emergency rooms) to quickly move to different wards, rescue sites, or examination areas. It is especially suitable for equipment that needs to be moved frequently or used temporarily (such as portable suction device 201 and ambulances), thus enabling a single person to push equipment weighing tens to hundreds of kilograms, greatly improving work efficiency.

[0033] In use, first adjust the height of the suction device 201, then start the motor 108. The output of the motor 108 drives the bidirectional lead screw 104 to rotate, which in turn drives the slider 105 to move in the opposite direction, thereby causing the rotating plate 106 to rotate. The rotation of the rotating plate 106 causes the mounting plate 102 to move up and down, which in turn causes the mounting plate 102 to adjust the height of the suction device 201 and the collection bottle 203. To prevent the suctioned sputum from flowing back into the patient's airway due to pressure fluctuations or changes in body position, the collection bottle 203 must always be positioned below the opening of the endotracheal tube / tracheostomy tube. The adjustable height allows medical staff to accurately place the collection bottle 203 in a safe low position (usually 10–20 cm below the chest cavity level) based on: the patient's bed height (adjustable from 50–90 cm); the patient's position (supine / 30° semi-recumbent); and the tube position (high neck vs. suprasternal notch). If the collection bottle 203 is higher than the airway, even with negative pressure, fatal reflux aspiration can easily occur once the machine stops or the pressure becomes unbalanced.

[0034] At the same time, it can reduce the bends in the tubing and maintain the stability of continuous low pressure. Continuous low pressure suctioning relies on a stable and low-resistance airflow channel. When the height is not adjustable, the connecting tube 302 is often forced to be folded, hang or tightened. After adjusting the height, a natural downward arc can be formed between the suction tube 301 → collection bottle 203 → suction device, without sharp angle bends.

[0035] Medical staff can use the suction tube 301 to deliver sputum into the collection bottle 203. Through the connecting tube 302 and the suction tube 301, the sputum can be delivered into the suction device 201 for suctioning. During suctioning, the collection bottle 203 easily fills with sputum. When it is necessary to remove the collection bottle 203, pull the pull rings 211 at both ends of the fixing frame 205. The pull rings 211 move the pull rod 210, which in turn moves the sliding plate 206 to compress the spring 209. The sliding plate then moves the insert block 207, disengaging it from the slot 208 on the collection bottle 203, allowing the collection bottle 203 to be removed. When it is necessary to fix the collection bottle 203, move it into the mounting box 202. During the movement, pulling the pull ring 211 causes it to move the insertion block 207 via the pull rod 210 and the slider 105, so that the side wall of the insertion block 207 abuts against the side wall of the collection bottle 203. The collection bottle 203 continues to move into the installation box 202 until the insertion block 207 is inserted into the slot 208 under the action of the spring 209, and then the collection bottle 203 can be re-fixed. Continuous low-pressure suction requires uninterrupted drainage, but the collection bottle 203 must be replaced in time when it is full. If traditional thread tightening, clamps or bolts are used for fixing, the replacement takes more than 30 seconds, requires two hands to operate, and even requires the use of tools. The suction process is forced to be interrupted, increasing the risk of sputum accumulation. The quick-release design can complete the replacement within 3-5 seconds, with almost no interruption of negative pressure, improving the suction efficiency.

[0036] The suctioned sputum contains a large number of bacteria and viruses (such as influenza virus, COVID-19, and tuberculosis bacteria). The filter plate 304 (usually a hydrophobic microporous membrane with a pore size ≤0.2 μm) can trap ≥99.9% of microbial aerosols, preventing pathogens from escaping into the environment or entering the suction unit through the negative pressure pipeline. This protects medical staff, other patients, and the public suction system, meeting the core requirements for hospital infection control. Furthermore, even with an anti-overflow design, backflow can still occur in the event of a sudden power outage, tipping, or overflow. The filter plate 304 acts as a final barrier, allowing gas to pass through while blocking liquids and solid particles, preventing corrosion, blockage, or damage to the expensive electric suction pump. After prolonged filtration, the filter plate 304 needs to be cleaned. Activating the telescopic push rod 308 causes the telescopic end of the push rod 308 to move the moving plate 306 along the slide rod 30. 5. The moving plate 306 drives the brush plate 307 to move, thereby cleaning the filter plate 304. Medical high-efficiency filters have a high unit price. For patients who need long-term suctioning (such as tracheotomy home care), 1-2 filters are consumed per day, resulting in high annual costs. The cleanable design allows the same filter plate 304 to be used multiple times, greatly reducing consumable expenses, especially benefiting primary hospitals and home users. If the filter plate 304 is blocked by thick sputum, the traditional method requires stopping the machine to replace it. However, the built-in cleaning component can quickly unclog it without disassembly, restoring ventilation efficiency and avoiding interruption of suction. It is particularly suitable for continuous low-pressure long-term suctioning scenarios.

[0037] According to another embodiment of the invention, such as Figure 1 , 5 As shown, each of the casters 310 is equipped with a brake pad. If the equipment slips during use, it will cause the suction tube 301 to be pulled, which may lead to displacement of the endotracheal tube or damage to the mucosa. The brake pad can lock the rotation and direction of the wheels at the same time, so that the equipment forms a "rigid connection" with the ground, which meets the stringent requirements of precision operation for static stability.

[0038] The above are preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A continuous low-pressure suction device, comprising a base plate (101), characterized in that: A mounting plate (102) is provided on the upper side of the base plate (101). A suction device (201) is provided on the upper end of the mounting plate (102). A lifting assembly is provided between the mounting plate (102) and the base plate (101). The lifting assembly includes a slide groove on the base plate (101). A bidirectional lead screw (104) is rotatably provided inside the slide groove. Slider blocks (105) are symmetrically provided at both ends of the bidirectional lead screw (104). The sliders (105) are threadedly connected to the bidirectional lead screw (104). A rotating plate (106) is rotatably provided on the upper end of each slider (105). The end of the rotating plate (106) away from the slider (105) is rotatably connected to the bottom of the mounting plate (102). A driving component for driving the bidirectional lead screw (104) to rotate is provided on the left end of the base plate (101).

2. The continuous low-pressure suction device as described in claim 1, characterized in that: The driving component includes a protective box (107) located at the left end of the base plate (101). A motor (108) is installed inside the protective box (107). The output end of the motor (108) is connected to the threaded rod through a coupling.

3. The continuous low-pressure suction device as described in claim 1, characterized in that: The upper end of the mounting plate (102) is provided with a suction device (201), the left end of the suction device (201) is provided with a mounting box (202), the inside of the mounting box (202) is provided with a collection bottle (203), the middle part of the mounting box (202) is provided with a clip (204), and the front and rear ends of the mounting box (202) are provided with fasteners for fixing the collection bottle (203).

4. The continuous low-pressure suction device as described in claim 3, characterized in that: The fastener includes a mounting bracket (205) mounted on the mounting box (202), a sliding plate (206) is slidably mounted inside the mounting bracket (205), an insert (207) is provided at one end of the sliding plate (206) near the collection bottle (203), and a slot (208) adapted to the insert (207) is provided on the side wall of the collection bottle (203).

5. The continuous low-pressure suction device as described in claim 4, characterized in that: A plurality of springs (209) are provided between the slide plate (206) and the fixed frame (205). A pull rod (210) is provided at one end of the slide plate (206). A pull ring (211) is provided on the outside of the fixed frame (205) of the pull rod (210). The pull rod (210) is slidably connected to the fixed frame (205).

6. The continuous low-pressure suction device as described in claim 3, characterized in that: The upper left end of the collection bottle (203) is connected to a suction tube (301), and the right end of the collection bottle (203) is connected to a connecting tube (302). A filter box (303) is provided on the upper left side of the suction device (201). The connecting tube (302) is connected to one end of the filter box (303), and the other end of the filter box (303) is connected to the suction device (201) through a negative pressure tube.

7. The continuous low-pressure suction device as described in claim 6, characterized in that: The filter box (303) has symmetrically arranged mounting slots inside, and a filter plate (304) is connected between the two mounting slots. The filter box (303) has symmetrically arranged sliding grooves on the left side inside, and sliding rods (305) are arranged inside each sliding groove. A moving plate (306) is slidably arranged between the two sliding rods (305). A brush plate (307) is arranged on the side wall of the moving plate (306). One end of the brush plate (307) abuts against the filter plate (304). A telescopic push rod (308) is arranged at the upper end of the filter box (303). The telescopic end of the telescopic push rod (308) extends to the lower end of the filter box (303) and connects to the upper side wall of the moving plate (306).

8. The continuous low-pressure suction device as described in claim 1, characterized in that: The suction device (201) is provided with a handle at the upper end, a vacuum gauge for observation is provided at the front end of the suction device (201), and an adjustment knob is fixedly installed on the side of the suction device (201).

9. The continuous low-pressure suction device as described in claim 1, characterized in that: Several telescopic rods (309) are provided between the base plate (101) and the mounting plate (102).

10. The continuous low-pressure suction device as described in claim 1, characterized in that: The lower end of the base plate (101) is provided with several casters (310), and each caster (310) is provided with a brake pad.

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