Filtering device of negative pressure aspirator

Abstract

The utility model relates to a filtering device of a negative pressure aspirator, which is used for carrying out solid-liquid separation on substances sucked into a liquid collecting bottle and comprises a filter cartridge, a positioning shaft and a filter screen group, the filter cartridge is arranged in the liquid collecting bottle, the upper end of the filter cartridge is open, and the upper end of the filter cartridge is communicated with an inlet of the liquid collecting bottle; a positioning shaft is detachably arranged in the filter cartridge, the positioning shaft and the filter cartridge are coaxially arranged inside and outside, the lower end face of the filter cartridge is hollowed out, liquid substances can flow out conveniently, a filter screen set is detachably arranged in the filter cartridge and comprises multiple layers of filter screens which are arranged in parallel up and down, the filtering effect is improved, each layer of filter screen is arranged on the positioning shaft in a sleeving mode, and radial positioning of the filter screens is achieved. According to the utility model, solid-liquid separation of an inhaled substance can be realized, the separated solid substance can be conveniently and directly observed, medical staff can conveniently search and check the solid substance, the occurrence probability of adverse events in an operation is reduced, the unnecessary operation time is prevented from being increased, the risk of infection of a patient is prevented from being increased, and the safety of the patient in the operation is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of negative pressure aspirators, in particular to a filtering device for a negative pressure aspirator. Background Art

[0002] A negative pressure aspirator is a common medical device that generates negative pressure to suck and remove foreign substances in tissues, body fluids or air. The main components of a negative pressure aspirator include a suction head, a suction device, a regulator and a liquid collection bottle. The suction head is the part that directly contacts the patient's tissue, and the suction head is connected to the liquid collection bottle through a pipeline; the liquid collection bottle, the regulator and the suction device are connected in sequence, the suction device is a component that generates negative pressure, the regulator is used to control the magnitude of the negative pressure generated by the suction device, and the negative pressure is transmitted to the suction head through these pipelines.

[0003] It can be seen from this that substances such as body fluids inhaled by the suction head ultimately enter the liquid collection bottle through the pipeline. The liquid collection bottle is used to collect body fluids attracted by the suction head, such as blood, exudate, etc. The bottle cap of the liquid collection bottle has an inlet and an air inlet. The inlet is used for the entry of substances such as body fluids, and the air inlet is connected to the suction device to generate air negative pressure in the liquid collection bottle.

[0004] During surgery, a negative pressure aspirator is often used. The negative pressure aspirator may inhale small surgical instruments such as surgical staples and needles during application. Some surgical instruments are consumed after long-term repeated use and generate debris, and the debris may also be caused by non-standard or violent behavior during the use of the instruments. These debris will also be inhaled into the liquid collection bottle.

[0005] As mentioned above, all substances inhaled during surgery are concentrated in the liquid collection bottle. Therefore, there are both liquids and foreign substances such as surgical needles or staples and debris of instruments in the liquid collection bottle. The liquid and solid foreign substances are mixed together, which is not convenient for observing the foreign substances, and at the same time brings difficulties to the search and quantity check of surgical instruments after surgery, and it takes a certain amount of time. Repeated searches increase the surgical duration of the patient, and at the same time the surgical cost, surgical risk of the patient also increase correspondingly, the postoperative infection rate rises, and the length of hospitalization also increases correspondingly. The probability of postoperative complications of the patient also increases greatly. At the same time, due to the limited human role, small debris of the instrument may not be found in time or not found, resulting in unnecessary surgical time being wasted all the time.

[0006] The conventional search method is to pour out all the substances in the liquid collection bottle and filter them with a gauze, which undoubtedly affects the sanitary environment and may cause cross-infection. Summary of the Invention

[0007] The present utility model aims to solve the problem that foreign objects sucked into the liquid collection bottle are mixed, making it inconvenient to search and check. It provides a filtering device for a negative pressure aspirator. A filter cylinder is arranged in the liquid collection bottle, and the filter cylinder is used to filter out instruments such as surgical needles and staples and debris of the instruments, so as to separate solid foreign objects from liquid, which is convenient for searching and counting surgical instruments and reducing the risk of omission of small instrument debris.

[0008] To achieve the above object, the technical solution adopted by the present utility model is as follows:

[0009] A filtering device for a negative pressure aspirator, used for solid-liquid separation of substances sucked into the liquid collection bottle, including a filter cylinder, a positioning shaft and a filter screen group. The filter cylinder is arranged in the liquid collection bottle, and the filter cylinder and the bottle cap of the liquid collection bottle are detachably connected, which facilitates the disassembly and assembly of the filter cylinder. The upper end of the filter cylinder is open, and the upper end of the filter cylinder is communicated with the inlet of the liquid collection bottle. Substances entering the liquid collection bottle must first pass through the filter cylinder.

[0010] The positioning shaft is detachably arranged in the filter cylinder, which facilitates the taking and placing of the positioning shaft. The positioning shaft and the filter cylinder are coaxially arranged inside and outside. The lower end face of the filter cylinder is hollowed out to facilitate the outflow of liquid substances. The filter screen group is also detachably arranged in the filter cylinder. The filter screen group includes multiple layers of filter screens arranged in parallel up and down, which improves the filtering effect. Each layer of the filter screen is sleeved on the positioning shaft to realize the radial positioning of the filter screen.

[0011] Further, the filter cylinder is a cylindrical structure made of medical transparent plastic, which is convenient for observing the substances inside the filter cylinder. The upper end of the filter cylinder is provided with an upward flanging, and the lower end is provided with a downward flanging. A plurality of reinforcing plate strips are also circumferentially and evenly arranged on the circumferential side of the filter cylinder. Each reinforcing plate strip is connected to the upward flanging upward and the downward flanging downward, which improves the strength of the whole filter cylinder.

[0012] Further, a plurality of mounting posts are circumferentially and evenly arranged on the upward flanging. The mounting posts are cylindrical bodies made of medical rubber and can produce elastic deformation. The mounting posts are clamped with the bottle cap of the liquid collection bottle. The cylindrical surface of the mounting posts is a continuous concave-convex corrugated surface, which improves the clamping effect and restricts the axial movement of the mounting posts to a certain extent.

[0013] Further, a plurality of through holes are circumferentially and evenly arranged on the lower end face of the filter cylinder to form a hollowed-out shape, which facilitates the outflow of liquid substances through the through holes. The plurality of through holes divide the lower end face of the filter cylinder into an inner support ring and an inner support plate. The inner support ring is a circular ring body, and the inner diameter of the inner support ring is smaller than the inner diameter of the filter cylinder. The inner support plate is a cross-shaped plate body, and the end of the inner support plate is connected to the circumference of the inner support ring.

[0014] Further, the center of the inner support plate is coaxial with the filter cylinder. A slot is provided at the center of the inner support plate, and the positioning shaft is inserted into the slot, which facilitates the insertion and removal installation of the positioning shaft. The positioning shaft is arranged vertically, and the height of the positioning shaft is less than the height of the filter cylinder.

[0015] Further, the multi-layer filter screens include a first filter screen, a second filter screen, and a third filter screen that are arranged at intervals in sequence from top to bottom, ensuring that the inhaled substances are filtered multiple times. The first filter screen is a circular mesh plate structure made of medical plastic. The second filter screen is a circular mesh plate structure made of magnetic material, which is convenient for adsorbing metal substances. The third filter screen is a circular plate structure made of medical sponge, improving the filtering accuracy.

[0016] Further, installation round sleeves are provided in the middle of both the first filter screen and the second filter screen. The installation round sleeves are sleeved on the positioning shaft and are in interference fit with the positioning shaft, ensuring reliable installation and being able to be disassembled. The third filter screen is arranged above the lower end face of the filter cylinder.

[0017] Further, the outer edges of the first filter screen and the second filter screen are respectively fitted with the inner wall of the filter cylinder. The outer edges of the first filter screen and the second filter screen are both bent upward to form side retaining rings, preventing solid substances from falling from the edges of the filter screens when the filter screens are taken out.

[0018] Through the above technical solutions, the beneficial effects of the present utility model are as follows:

[0019] The structure of the present utility model is reasonably designed. By using the method of snap connection between the installation posts and the bottle cap, the filter cylinder and the liquid collection bottle can be conveniently disassembled and assembled, facilitating the timely treatment of the substances in the filter cylinder. The filter cylinder is made of a transparent material, which is convenient for personnel to directly observe the substances in the filter cylinder. There is a filter screen group in the filter cylinder, and the filter screen group is composed of multiple filter screens, which can perform multiple filtrations on the inhaled substances, ensuring the filtering effect and realizing effective solid-liquid separation.

[0020] The positioning shaft and the filter cylinder of the present utility model are connected by plugging and unplugging. The first filter screen and the second filter screen are in interference fit on the positioning shaft. Furthermore, the first filter screen and the second filter screen rely on the positioning shaft. After the positioning shaft is taken out, the two filter screens are removed from the filter cylinder together, facilitating the cleaning of the substances on the filter screens. The second filter screen is made of magnetic material, which can adsorb magnetic materials such as nails, needles, and small debris of instruments during the operation, facilitating observation and identification. The third filter screen is made of flexible sponge material, with more refined filtration, and can retain some small consumables made of non-magnetic materials to avoid omission and facilitate search. The inner support ring and the inner support plate can reliably support the third filter screen, preventing the third filter screen from deforming and affecting the filtering effect.

[0021] The filter cartridge of the present utility model achieves the effect of solid-liquid separation. The substances sucked into the liquid collection bottle first pass through the filter cartridge. Under the multiple interceptions of the filter cartridge, solid substances are ensured to be inside the filter cartridge, and liquid substances enter the liquid collection bottle. Thus, medical staff can directly observe the situation of solid substances inside the filter cartridge, which is convenient for searching and checking surgical needles, nails, or debris of instruments accidentally inhaled, ensuring the success of the operation. Brief Description of the Drawings

[0022] Figure 1 is the front view of the filtration device of the negative pressure aspirator of the present utility model.

[0023] Figure 2 is the sectional view of the filtration device of the negative pressure aspirator of the present utility model.

[0024] Figure 3 is the Figure 2 schematic diagram of the mounting post at position A in the filtration device of the negative pressure aspirator of the present utility model.

[0025] Figure 4 is the Figure 2 schematic diagram of the side retaining ring at position B in the filtration device of the negative pressure aspirator of the present utility model.

[0026] Figure 5 is the Figure 2 schematic diagram of the mounting round sleeve at position C in the filtration device of the negative pressure aspirator of the present utility model.

[0027] Figure 6 is the installation schematic diagram of the filter cartridge and the positioning shaft of the filtration device of the negative pressure aspirator of the present utility model.

[0028] Figure 7 is the Figure 6 sectional view in the A-A direction of the filtration device of the negative pressure aspirator of the present utility model.

[0029] Figure 8 is the sectional view of the filter mesh group of the filtration device of the negative pressure aspirator of the present utility model.

[0030] The reference numerals in the drawings are: 1 filter cartridge, 2 positioning shaft, 3 filter mesh group, 31 filter mesh one, 32 filter mesh two, 33 filter mesh three, 4 upper flanging, 5 mounting post, 6 through hole, 71 inner support ring, 72 inner support plate, 8 slot, 9 mounting round sleeve, 10 side retaining ring, 11 lower flanging, 12 reinforcing strip. Detailed Description of the Preferred Embodiment

[0031] The following is a detailed description of the specific embodiments of the present utility model with reference to the drawings:

[0032] As Figures 1 to 8As shown, a negative pressure aspirator filtering device is used to separate solids and liquids from the substances inhaled into the liquid collection bottle, facilitating the search and verification of accidentally inhaled surgical instruments and debris. The filtering device includes a filtering cylinder 1, a positioning shaft 2, and a filter screen group 3, as Figure 1 and Figure 2 shown.

[0033] The filtering cylinder 1 is the installation foundation of the entire filtering device. The filtering cylinder 1 is arranged inside the liquid collection bottle. The filtering cylinder 1 is a cylindrical structure made of medical transparent plastic, which facilitates the viewing and observation of the substances inside the filtering cylinder 1. When installing the filtering cylinder 1, the filtering cylinder 1 and the bottle cap of the liquid collection bottle are detachably connected, which can facilitate the disassembly and assembly of the filtering cylinder 1 and quickly clean the substances inside it.

[0034] Specifically, the upper end of the filtering cylinder 1 is provided with an up-turned edge 4. Four mounting posts 5 are circumferentially and evenly arranged on the up-turned edge 4. The mounting posts 5 are cylinders made of medical rubber and have a certain elastic deformation ability. The cylindrical surface of the mounting post 5 is a continuous concave-convex corrugated surface, and the cylindrical surface of the mounting post 5 is similar to a toothed shape, as Figure 3 shown.

[0035] The mounting posts 5 are snap-connected to the bottle cap of the liquid collection bottle. That is, circular holes are opened on the bottle cap of the liquid collection bottle. The number of circular holes is four and corresponds to the mounting posts 5 one by one. The mounting posts 5 can be inserted into the circular holes to realize the installation of the filtering cylinder 1. The mounting posts 5 inside the circular holes generate elastic deformation, and the deformation force is used to fix the mounting posts 5 inside the circular holes. At the same time, under the action of the toothed side walls of the mounting posts 5, the up-and-down axial movement of the mounting posts 5 is avoided, and the filtering cylinder 1 can be reliably installed and fixed to the bottle cap of the liquid collection bottle. After installation, the filtering cylinder 1 is in a suspended state.

[0036] The upper end of the filtering cylinder 1 is open, and the upper end of the filtering cylinder 1 is communicated with the inlet of the liquid collection bottle. In this way, the inhaled substances first enter the filtering cylinder 1. After the filtering cylinder 1 filters the solid substances, the liquid substances naturally flow downward into the liquid collection bottle. Therefore, the lower end surface of the filtering cylinder 1 is hollowed out, which does not affect the flow of the liquid substances.

[0037] In this embodiment, four through holes 6 are circumferentially and evenly arranged on the lower end surface of the filtering cylinder 1. The through holes 6 are fan-shaped holes. Under the action of the through holes 6, the lower end surface of the filtering cylinder 1 forms a hollowed-out shape, which can avoid the closure of the lower end of the filtering cylinder 1 and ensure that the inhaled substances pass through the filtering cylinder 1 normally from top to bottom, as Figure 7 shown. The four through holes 6 divide the lower end surface of the filtering cylinder 1 into an inner support ring 71 and an inner support plate 72. The inner support ring 71 and the inner support plate 72 are of an integral structure and are both part of the lower end surface of the filtering cylinder 1. The inner support ring 71 is a circular ring body, and the inner diameter of the inner support ring 71 is smaller than the inner diameter of the filtering cylinder 1. The inner support plate 72 is a cross-shaped plate body, and the end of the inner support plate 72 is connected to the circumference of the inner support ring 71.

[0038] A positioning shaft 2 is detachably arranged inside the filter cartridge 1. The positioning shaft 2 is a round rod made of medical plastic. When the positioning shaft 2 is installed, the center of the inner support plate 72 is coaxial with the filter cartridge 1. A slot 8 is provided at the center of the inner support plate 72, and the positioning shaft 2 is inserted into the slot 8. The positioning shaft 2 is installed with the filter cartridge 1 in a plug-and-play manner, which is convenient to be taken out from the filter cartridge 1, as Figure 6 shown. The positioning shaft 2 is arranged vertically, and the positioning shaft 2 and the filter cartridge 1 are coaxially arranged inside and outside. The height of the positioning shaft 2 is less than the height of the filter cartridge 1.

[0039] A filter screen group 3 is also detachably arranged inside the filter cartridge 1. The filtering function of the entire filtering device is realized by the filter screen group 3. The filter screen group 3 can also be taken out from the filter cartridge 1. The filter screen group 3 includes multiple layers of filter screens arranged in parallel up and down. There is a certain interval between the uppermost filter screen and the upper end face of the filter cartridge 1. Each layer of filter screen is sleeved on the positioning shaft 2. The positioning shaft 2 positions the filter screen internally, and the inner wall of the filter cartridge 1 positions the filter screen externally, thereby preventing the filter screen from moving horizontally.

[0040] In this embodiment, the multiple layers of filter screens include a first filter screen 31, a second filter screen 32, and a third filter screen 33 that are arranged at intervals in sequence from top to bottom. Thus, there are three layers of filter screens, as Figure 8 shown. The first filter screen 31 is a circular mesh plate structure made of medical plastic. The second filter screen 32 is a circular mesh plate structure made of magnetic material, which can adsorb some surgical tools such as needles and nails. The third filter screen 33 is a circular plate structure made of medical sponge. The structures between the three layers of filter screens are the same, but the manufacturing materials are different, and thus they have different functions.

[0041] When the first filter screen 31 and the second filter screen 32 are installed, mounting sleeves 9 are fixedly provided in the middle of the first filter screen 31 and the second filter screen 32. The mounting sleeves 9 are sleeved on the positioning shaft 2 and are in interference fit with the positioning shaft 2. Thus, an elastic pressure is generated between the mounting sleeve 9 and the positioning shaft 2, thereby ensuring reliable connection, as Figure 5 shown. However, through artificial axial movement, the mounting sleeve 9 can still be removed from the positioning shaft 2, thereby realizing the separation of the first filter screen 31 or the second filter screen 32 from the positioning shaft 2. After installation, the outer edges of the first filter screen 31 and the second filter screen 32 are respectively in contact with the inner wall of the filter cartridge 1, and there is a distance between the first filter screen 31 and the upper end face of the filter cartridge 1.

[0042] When the third filter screen 33 is installed, the third filter screen 33 is arranged above the lower end face of the filter cartridge 1, and the third filter screen 33 is sleeved outside the slot 8. The inner support plate 72 supports the third filter screen 33, and at the same time, the inner support ring 71 supports the outer edge of the third filter screen 33. Due to the sponge material of the third filter screen 33, it has a certain softness. Therefore, the inner support plate 72 and the inner support ring 71 are used to support it evenly, and the stability of the support can be ensured to prevent the third filter screen 33 from deforming.

[0043] The principle of this utility model is as follows: holes are pre - drilled on the periphery of the inlet of the liquid - collecting bottle cap, and the mounting post 5 is clamped with the holes on the cap, so as to install and fix the filter cylinder 1 under the cap. At this time, the filter cylinder 1 is inside the liquid - collecting bottle and communicates with the inlet of the liquid - collecting bottle. When the liquid - collecting bottle is in normal use, the substances sucked in under negative pressure first enter the filter cylinder 1 through the inlet on the cap, and then flow downward into the liquid - collecting bottle.

[0044] During the process of the above - mentioned substances flowing through the filter cylinder 1, the filter cylinder 1 can intercept the solid substances sucked in, and the multi - layer filter screens can ensure the interception effect. Among them, the first filter screen 31 and the second filter screen 32 cooperate to block surgical needles, staples and other tools as well as debris of surgical instruments, and the third filter screen 33 can filter solid substances more finely, thus improving the filtering effect.

[0045] Thus, the solid substances are intercepted in the filter cylinder 1 and the liquid substances are in the liquid - collecting bottle, realizing the solid - liquid separation of the sucked - in substances. Medical staff can conveniently observe the situation of the solid substances sucked into the filter cylinder 1 through the transparent liquid - collecting bottle and the filter cylinder 1. If surgical needles, staples and other tools are sucked in, they can be seen in time, which is convenient for personnel to search and check. This utility model solves the problems of difficult search and increased workload of nurses, ensures the patient's operation time, avoids increasing the operation cost and risk, and at the same time reduces the risk of medical exposure of nurses themselves, preventing the situation where the environment may be polluted and the difficulty of handling medical waste by medical waste handlers increases.

[0046] When it is necessary to process the substances in the filter cylinder 1, open the cap of the liquid - collecting bottle, pull out the filter cylinder 1 downward, and then the mounting post 5 is separated from the cap. At this time, pull out the positioning shaft 2, driving the first filter screen 31 and the second filter screen 32 to move out of the filter cylinder 1 together, and the substances on each layer of the filter screen can be processed. Since both the first filter screen 31 and the second filter screen 32 are circular plates, the substances on them may fall off after being taken out of the filter cylinder 1. Therefore, the outer edges of the first filter screen 31 and the second filter screen 32 are bent upward and extended to form side retaining rings 10, as Figure 4 shown. In this way, the first filter screen 31 and the second filter screen 32 are equivalent to a net - shaped circular groove, which can restrict the filtered substances and prevent them from falling off.

[0047] In order to optimize the product structure and ensure reliable supporting force at the lower end of the filter cartridge 1, a downward flanging 11 is provided at the lower end of the filter cartridge 1. The downward flanging 11 is integrally connected with the inner support ring 71 and is located on the same plane. The downward flanging 11 is equivalent to an increase in the outer diameter of the inner support ring 71. Four transparent reinforcing strips 12 are also circumferentially and evenly arranged on the circumferential side of the filter cartridge 1. Each reinforcing strip 12 is connected to the upward flanging 4 upward and the downward flanging 11 downward. Since both the positioning shaft 2 and the filter screen group 3 are borne by the lower end of the filter cartridge 1, the arrangement of the downward flanging 11 and the reinforcing strips 12 can not only increase the structural strength of the lower end of the filter cartridge 1, but also improve the structural strength of the entire filter cartridge 1.

[0048] The above-described embodiments are only preferred embodiments of the present invention and do not limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made according to the structure, features, and principles described in the scope of the present invention patent shall be included in the scope of the present invention's patent application.

Claims

1. A negative pressure suction filter device, used for solid-liquid separation of substances sucked into a liquid collection bottle, characterized in that: It comprises a filter cartridge (1), a positioning shaft (2) and a filter screen group (3), wherein the filter cartridge (1) is arranged in a liquid collecting bottle, the filter cartridge (1) and the bottle cap of the liquid collecting bottle are detachably connected, the upper end of the filter cartridge (1) is open, and the upper end of the filter cartridge (1) is connected to the inlet of the liquid collecting bottle; The filter cartridge (1) is detachably provided with the positioning shaft (2), the positioning shaft (2) and the filter cartridge (1) are coaxially arranged inside and outside, the lower end surface of the filter cartridge (1) is hollowed out, and the filter screen group (3) is also detachably provided in the filter cartridge (1), the filter screen group (3) comprising multiple layers of filter screens arranged in parallel up and down, each layer of the filter screens being sleeved on the positioning shaft (2).

2. The negative pressure suction filter device according to claim 1, characterized in that: The filter cartridge (1) is a cylindrical structure made of medical transparent plastic. An upper flange (4) is provided at the upper end of the filter cartridge (1), and a lower flange (11) is provided at the lower end. A plurality of reinforcing strips (12) are also provided in an annular direction around the circumference of the filter cartridge (1). Each of the reinforcing strips (12) is connected to the upper flange (4) upwards and to the lower flange (11) downwards.

3. The negative pressure suction filter device according to claim 2, characterized in that: A plurality of mounting posts (5) are provided in an annular direction on the upper flange (4); the mounting posts (5) are cylindrical bodies made of medical rubber; the cylindrical surface of the mounting posts (5) is a continuously concave and convex folded surface; the mounting posts (5) are snap-connected to the cap of the liquid collecting bottle.

4. The negative pressure suction filter device according to claim 1, characterized in that: The lower end surface of the filter cartridge (1) is provided with a plurality of through holes (6) in a circumferential direction to form a hollow shape. The plurality of through holes (6) divide the lower end surface of the filter cartridge (1) into an inner support ring (71) and an inner support plate (72). The inner support ring (71) is a circular ring body. The inner diameter of the inner support ring (71) is smaller than the inner diameter of the filter cartridge (1). The inner support plate (72) is a cross-shaped plate body. The end of the inner support plate (72) is connected to the circumference of the inner support ring (71).

5. The negative pressure suction filter device according to claim 4, characterized in that: The center of the inner support plate (72) and the filter cartridge (1) are coaxial, and a slot (8) is provided at the center of the inner support plate (72). The positioning shaft (2) is inserted into the slot (8). The positioning shaft (2) is arranged vertically, and the height of the positioning shaft (2) is less than the height of the filter cartridge (1).

6. The negative pressure suction filter device according to claim 1, characterized in that: The multi-layer filter screen comprises filter screen one (31), filter screen two (32) and filter screen three (33) which are arranged in sequence from top to bottom. Filter screen one (31) is a circular mesh plate structure made of medical plastic, filter screen two (32) is a circular mesh plate structure made of magnetic material, and filter screen three (33) is a circular plate structure made of medical sponge.

7. The negative pressure suction filter device according to claim 6, characterized in that: The middle parts of the filter screen one (31) and the filter screen two (32) are both provided with mounting circular sleeves (9), the mounting circular sleeves (9) are sleeved on the positioning shaft (2) and are interference fit with the positioning shaft (2), and the filter screen three (33) is arranged above the lower end surface of the filter cartridge (1).

8. The negative pressure suction filter device according to claim 6, characterized in that: The outer edges of the filter screen one (31) and the filter screen two (32) are respectively fitted with the inner wall of the filter cartridge (1), and the outer edges of the filter screen one (31) and the filter screen two (32) are both bent and extended upward to form a side retaining ring (10).

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