CN211246116U - Serially connectable filtering device and system, filtered material collecting system and filtering storage system - Google Patents

Abstract

The application discloses a filtering device and a system which can be connected in series, a filtered material collecting system and a filtering storage system, wherein the filtering device which can be connected in series comprises a body and a filtering layer, a first containing cavity is arranged on the body, and the first containing cavity is provided with a first opening and a second opening; the filter layer is arranged in the first cavity. In the above solution, the biological fluid may pass through the first opening, the filter layer and the second opening, and when passing through the filter layer, the filter layer may capture the target biological material therein, and the unwanted material may flow out together with the fluid, so as to allow the user to obtain the specific target biological material. The filtering device can be connected in series, and different biological materials in urine can be captured simultaneously by connecting filtering devices filled with different filtering layers in series. The first collecting device is squeezed by hands, the piston is pulled to produce negative pressure and gravity, and power is provided for liquid to pass through the filter layer.

Description

Serially connectable filtering device and system, filtered material collecting system and filtering storage system

Technical Field

The utility model relates to a biological fluid filtering component specifically is a but convenient operation's series connection filter equipment and system and filtration thing collecting system and filtration storage system.

Background

Bladder cancer refers to a malignant tumor which occurs on the mucous membrane of the bladder and is the most common malignant tumor in the urinary system, the incidence rate of the malignant tumor is ranked fourth in males and eleventh in females, and the incidence rate of the malignant tumor also increases year by year. Symptoms include sub-specularly or macroscopically visible hematuria, frequent urination, painful urination, dysuria, and the like. It was found that the initial diagnosis of non-muscle invasive bladder cancer accounts for approximately 75% of bladder cancer, with 50% being low grade, tumors with a predominantly microemulsion head shape, with a 5-year survival rate of approximately 90%, but with a very high recurrence rate, and with up to 25% of the recurrences worsening, which required regular patient follow-up throughout the life. Cystoscopy is one of the most important tests for diagnosing bladder tumors, and the gold standard for diagnosing bladder cancer is used in pathological examination by cystoscopy. Since the number of factors causing hematuria is very large and patients with hematuria have been diagnosed with bladder cancer to an extent of less than 10%, the number of cystoscopies performed to remove bladder cancer is very high, which imposes a great burden on the medical system; furthermore, an invasive procedure for cystoscopy involves a certain risk and also causes considerable discomfort to the patient. Gold standards in non-invasive diagnostic methods at urine cytology, but sensitivity is relatively low, especially in well-differentiated tumors. There is currently a strong search for ways to reliably and cost-effectively diagnose and monitor bladder cancer using non-invasive techniques.

In the aspect of biochemical examination, urine detection is an ideal detection method at present, and the research space is large at present. The urine detection comprises urine exfoliative cytology examination, tumor molecular marker detection, fluorescence in situ hybridization technology and the like. The urine cast-off cytology examination is the most common clinical mode for noninvasive, simple and convenient bladder tumor detection at present, and has the sensitivity of about 13-75 percent and the specificity of about 85-100 percent. The tumor molecular marker is an indicator which can judge the occurrence, development and even prediction of tumors, has significance for early diagnosis of the tumors, but usually needs invasive operation for obtaining. Compared with blood, urine is an ideal sample for detecting bladder tumor molecular markers because the components of urine are blood filtrate, the urine is obtained noninvasively, and the bladder is used as an organ with the largest contact area with the urine, so that various substances reflecting the bladder state can be left in the urine, and the occurrence of bladder diseases can be predicted or monitored by using the substances.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of the utility model is to provide a but series connection filter equipment and system and filtration thing collecting system and filtration storage system that can collect biomaterial in the biological fluid.

In a first aspect, an embodiment of the present application provides a filtering device, which includes a body and a filtering layer, wherein a first cavity is arranged on the body, and the first cavity is provided with a first opening and a second opening; the filter layer is arranged in the first cavity; the filtering device is provided with a first fixing structure, the filtering device is detachably connected with the other filtering device through the first fixing structure, and when the filtering device is connected with the other filtering device, a first containing cavity of the filtering device is communicated with a first containing cavity of the other filtering device.

In one embodiment, the filter device is further provided with a second fixing structure, and the second fixing structure is matched with the first fixing structure; the filter device is detachably mounted on the other filter device through the first fixing structure and the second fixing structure of the other filter device in a matching mode.

In one embodiment, the second fixing structure is one or more of a snap structure, a bolt structure and a magnetic connection structure.

In one embodiment, the first fixing structure is one or more of a snap structure, a thread structure and a magnetic connection structure. In one embodiment, the first fixing structure is disposed at the first opening, and the second fixing structure is disposed at the second opening.

In one embodiment, the filter device may be installed in a centrifuge tube, and the body is provided with a fixing member and installed on the centrifuge tube through the fixing member.

In one embodiment, the fixing member is a fastening member, and the body is fastened to the centrifugal tube by the fixing member.

In one embodiment, the fixing member is a ledge.

In one embodiment, the body tapers in a direction from the first opening to the second opening.

In one embodiment, the first opening is parallel to the second opening and the first opening is located above the second opening.

In a second aspect, an embodiment of the present application provides a filtration system, including a first collection device and one or more of the filtration devices in any one of the embodiments of the first aspect, the first collection device is provided with a second cavity, the second cavity is provided with a third opening, the first collection device is detachably connected to the filtration device, and when the first collection device is connected to the filtration device, the first opening is communicated with the third opening.

In one embodiment, the first collecting device is provided with a third fixing structure, and the first fixing structure is detachably connected with the third fixing structure.

In one embodiment, the first fixing structure is disposed at the first opening, and the third fixing structure is disposed at the third opening.

In one embodiment, the first collection device further comprises a first seal cap removably mounted over the third opening; more preferably, the first sealing cover is mated with a third securing structure.

In one embodiment, the second cavity further comprises a fourth opening, and the first collecting device further comprises a second sealing cover detachably mounted on the fourth opening.

In one embodiment, the opening area of the fourth opening is larger than the opening area of the third opening.

In one embodiment, the first collecting device is an elastic structure and/or a telescopic structure.

In one embodiment, the material of the first collecting device is one or more of plastic, memory metal and alloy.

In one embodiment, the first collecting device is partially or completely of a pleated structure.

In one embodiment, the first collecting means is a transparent structure.

In one embodiment, the first collecting device is provided with scales.

In a third aspect, an embodiment of the present application provides a filtrate collection system, including a second collection device and one or more of the filtration devices in any of the embodiments of the first aspect, where the second collection device is provided with a third cavity, the third cavity is provided with a fifth opening, the second collection device is detachably connected to the filtration device, and when the second collection device is connected to the filtration device, the second opening is communicated with the fifth opening.

In one embodiment, the second collecting device is provided with a piston.

In one embodiment, a handle is provided on the piston.

In one embodiment, one end of the piston is opposite to the fifth opening, and the other end of the piston is provided with a handle.

In a fourth aspect, embodiments of the present application provide a filtering storage system, including a storage device and one or more filtering devices in any of the embodiments of the first aspect; the storage device comprises a storage and an upper cover, the filter device can be placed in the storage, and the upper cover is used for sealing the storage.

In one embodiment, the storage is provided with a protective liquid.

In the above embodiments, by connecting the filter devices provided with different types of filter layers, it is possible to achieve simultaneous capture of different biological materials in the biological fluid.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural view of one embodiment of a filtering device.

Fig. 2 is a schematic structural diagram of one embodiment of the first collecting device.

Fig. 3 is a schematic structural diagram of one embodiment of the second collecting device.

Fig. 4 is an exploded view of the combination of the filtering device, the first collecting device and the second collecting device in one embodiment.

FIG. 5 is a schematic diagram of a filtering device and a memory according to an embodiment.

Fig. 6 shows the connection between the filter device and the filter device in one embodiment.

Fig. 7 shows the connection between the filter device and the filter device in one embodiment.

Fig. 8 shows the connection of two filter devices and a first collecting device in one embodiment.

The labels in the figure are: 1. a body; 2. a filter layer; 11. a first cavity; 12. a first opening; 13. a second opening; 14. a fixing member; 15. a second fixed structure; 16. a first fixed structure; 3. a first collection device; 31. a second cavity; 32. a third opening; 33. a third fixed structure; 34. a first sealing cover; 35. a fourth opening; 36. a second sealing cover; 4. a second collection device; 41. a third cavity; 42. a fifth opening; 43. a piston; 44. a handle; 5. a memory; 51. and (7) covering.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "signal connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The term "communicate" is also to be understood broadly, i.e., may be direct or indirect via an intermediary. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

"plurality" or "a plurality" in the present disclosure and appended claims refers to two (or more) or more than two, unless otherwise indicated.

Example 1

In an embodiment, the present application provides a filtering apparatus, as shown in fig. 1, including a body 1 and a filtering layer 2, where the body 1 is provided with a first cavity 11, and the first cavity 11 is provided with a first opening 12 and a second opening 13; the filter layer 2 is disposed in the first chamber 11. In the above-mentioned scheme, the biological fluid can pass through the first opening 12, the filter layer 2 and the second opening 13, while the filter layer 2 can capture the target biological material (the biological material can be free DNA, cells, protein, etc.) therein when passing through the filter layer 2, and the unwanted material can flow out together with the biological fluid, thereby allowing the user to obtain the specific target biological material. It will be appreciated by those skilled in the art that the filter layer 2 may be disposed within the first volume 11 or outside the first volume 11 as desired, such that fluid passing through the filter device passes through the first opening 12, the filter layer 2 and the second opening 13.

In one embodiment, as shown in fig. 7, the filter device is further provided with a second fixing structure 15, and the second fixing structure 15 is matched with the first fixing structure 16; the filter device is detachably mounted on another filter device by the first fixing structure 16 cooperating with the second fixing structure 15 of the other filter device. In one embodiment, the first fastening structure 16 is disposed at the first opening, and the second fastening structure 15 is disposed at the second opening. In one embodiment, the second fixing structure 15 is one or more of a snap structure, a bolt structure and a magnetic structure. In one embodiment, the first fixing structure is one or more of a snap structure, a thread structure and a magnetic connection structure. In the embodiments described above, the filter devices may be connected in series, and as shown in fig. 7, two filter devices filled with different filter materials may be detachably connected to form a two-stage filter device having two membranes, in which case the biological fluid passes through the first opening, the filter layer, and the second opening of the first filter device, and then the first opening, the filter layer, and the second opening of the second filter device, and the filter layer captures the target biological material therein while passing through the filter layer. In the above embodiment, by connecting the filtering devices filled with different filtering layers in series, different biological materials in the biological fluid can be captured simultaneously.

Although in the above described embodiments the filter device is removably connected to the other filter device by the first fastening structure 16 cooperating with the second fastening structure 15, in some embodiments, as shown in fig. 6, the filter device may be fastened between the two filter devices by the first fastening structure 16 itself cooperating with the first fastening structure 16 of the other filter device without relying on the second fastening structure. In some preferred embodiments, the first fixing structure is a magnetic connection structure. In other embodiments, the first securing structure is disposed at the first opening. In the above embodiment, the two filtering devices can be fixed by the first fixing structure arranged at the first opening, and the two filtering devices are communicated with each other because the first openings of the two filtering devices are oppositely arranged.

In one embodiment, the filtering device is used for connecting a first collecting device 3 and a second collecting device 4, a first fixing structure 16 is arranged on the body 1, and the first fixing structure 16 is detachably connected with the first collecting device 3. In one embodiment, the first fixing structure 16 is one or more of a snap structure, a bolt structure, a thread structure and a magnetic structure. In one embodiment, the body 1 is provided with a second fixing structure 15, and the second fixing structure 15 is detachably connected with the second collecting device 4. In one embodiment, the second fixing structure 15 is one or more of a snap structure, a bolt structure, a thread structure and a magnetic structure. In some embodiments, the first fixing structure 16 is a threaded structure disposed on an inner wall of the first cavity and located at an upper end (i.e., the first opening) of the first cavity.

It is understood that the first collecting device 3 may be a collecting chamber, a collecting bottle, a collecting tube, and various types of devices for collecting biological fluids. The second collecting device 4 can be a collecting chamber, a collecting bottle, a waste liquid pool, a collecting pipe and various devices for collecting biological liquid.

In order to facilitate the filtration of the filtration device and then directly placing the filtration device into a centrifuge tube for centrifugation, in one embodiment, the fixing member 14 is provided on the body 1, and the body 1 is mounted on the centrifuge tube through the fixing member 14. In one embodiment, the fixing member 14 is a snap-fit member, and the body 1 is snap-fit fixed on the centrifuge tube by the fixing member 14. In one embodiment, the fixing member 14 is a ledge. In one embodiment, the fixing member 14 is a convex edge on the outer edge of the body 1. It should be understood that the shape of the convex edge may be a triangle, square, circle, ellipse, or polygon. It should also be understood that the convex edge does not necessarily match the cross-section of the body 1, and if the cross-section of the body 1 is circular, the convex edge may be triangular, square, circular or elliptical.

In order to facilitate the insertion of the body 1 into a conical centrifuge tube, in one embodiment the body 1 tapers in the direction from the first opening 12 to the second opening 13. At the same time, as when the filter layer 2 is arranged at the second opening 13, the biological fluid can be better collected in the filter layer 2 by the design that the body 1 becomes progressively smaller in the direction from the first opening 12 to the second opening 13.

In one embodiment, the material of the filter layer 2 is one or more of resin, activated carbon and silica gel, or the filter layer 2 is a filter membrane. It should be understood that other materials for filtering materials can be used to form the filter layer 2, and the user can select the material of the filter layer 2 according to the type of the target biological fluid to be obtained.

In one embodiment, the first opening 12 is parallel to the second opening 13 and the first opening 12 is located above the second opening 13.

In one embodiment, the biological fluid is blood, serum, urine, bladder irrigation fluid, lavage fluid, saliva, or the like.

Example 2

In an embodiment, the present application provides a filtering system, which includes a first collecting device 3 and one or more filtering devices in any embodiment of embodiment 1, where the first collecting device 3 is provided with a second cavity 31, the second cavity 31 is provided with a third opening 32, the first collecting device 3 is detachably connected to the filtering device, and when the first collecting device 3 is connected to the filtering device, the first opening 12 is communicated with the third opening 32. In one embodiment, the first collecting device 3 is provided with a third fixing structure 33, the filtering device is provided with a first fixing structure 16, and the first fixing structure 16 is detachably connected with the third fixing structure 33. In one embodiment, the first fixing structure 16 is disposed at the first opening 12, and the third fixing structure 33 is disposed at the third opening 32. In one embodiment, the first fixing structure is an internal thread in the body 1, the third fixing structure 33 is an external thread provided on the first collecting device 3, and the body 1 and the first collecting device 3 are connected by the thread fit of the first fixing structure and the third fixing structure 33. It will be understood that although in the above described embodiments the coupling of the filtering means to the first collecting device 3 is obtained by the cooperation of the first fixing structure 16 with the third fixing structure 33, in some embodiments, as shown in figure 8, said filtering means is provided with the second fixing structure 15 and the coupling of the filtering means to the first collecting device 3 is obtained by the cooperation of said second fixing structure 15 with the third fixing structure 33. In some preferred implementations, the filter device is connected to another filter device by a first fixture 16. It will also be appreciated that in the above embodiments, the filtration system may incorporate one or more filtration devices as desired, wherein different filtration devices may be provided with different types of filtration layers, e.g. in some embodiments, two filtration devices may be incorporated, wherein one filtration device comprises a filtration layer for intercepting exfoliated cells and the other filtration device comprises a filtration layer for intercepting free DNA, thereby achieving multi-level filtration of biological fluids.

It should be understood that although in the above-mentioned embodiment, the first fixing structure 16 is disposed at the first opening 12, and the third fixing structure 33 is disposed at the third opening 32, the first fixing structure 16 and the third fixing structure 33 may be disposed at positions other than the first opening 12 and the third opening 32, respectively, and only the first opening 12 and the third opening 32 need to be communicated when they are connected. It should also be understood that although in the present embodiment the filter layer 2 is disposed within the first volume 11, in some other embodiments the filter layer 2 may be disposed outside the first volume 11 and the filter layer 2 is connected to the first opening 12 or the second opening 13.

In order to avoid urine flowing out of the third opening 32 when the user collects biological fluid (such as urine) from the fourth opening 35, in one embodiment, the first collection device 3 further comprises a first sealing cover 34, and the first sealing cover 34 is detachably mounted on the third opening 32; in one embodiment, the third fixed structure 33 is disposed on the third opening 32, and the first sealing cover 34 is matched with the third fixed structure 33, so that when the first sealing cover 34 is matched with the third fixed structure 33, the first sealing cover 34 also seals the third opening 32 to prevent the biological fluid from flowing out of the third opening 32. In one embodiment, the second cavity 31 further comprises a fourth opening 35, and the first collecting device 3 further comprises a second sealing cover 36, wherein the second sealing cover 36 is detachably mounted on the fourth opening 35, and the first collecting device 3 is sealed by the first sealing cover 34 and the second sealing cover 36, so as to prevent the fluid in the first collecting device 3 from losing. In one embodiment, the second sealing cover 36 is screwed to the fourth opening 35.

In one embodiment, the opening area of the fourth opening 35 is larger than the opening area of the third opening 32.

In order to facilitate the transportation of the biological fluid collected by the first collection device 3 to the filter device, in one embodiment, the first collection device 3 is an elastic structure and/or a telescopic structure, and the user can squeeze the biological fluid out of the first collection device 3 by pressing the first collection device with force and flow the biological fluid into the filter device through the third opening 32.

In order to facilitate the user to determine the volume of the biological fluid collected by the first collection device 3, in one embodiment, the first collection device 3 is a transparent structure. Also in one embodiment, the first collection means 3 is provided with a scale, so that the user can more intuitively understand the volume of biological fluid in the first collection means 3.

In one embodiment, the first collecting device 3 is partially or completely corrugated.

In one embodiment, the material of the first collecting device 3 is one or more of plastic, memory metal, and alloy.

In one embodiment, when the biological fluid is collected and filtered, the second sealing cover 36 of the first collection unit 3 is opened, the biological fluid is discharged into the first collection unit 3, and then the second sealing cover 36 is closed, and the volume of the biological fluid is observed. If the volume of the biological fluid is excessive, the first sealing cover 34 can be opened to connect the third opening 32 with the outside, so as to pour out part of the biological fluid to ensure that the volume of the biological fluid is in accordance with the specification. After the volume of biological fluid is suitable, the first sealing cap 34 is removed and the first collection device 3 is detachably connected to the filtering device (in one embodiment, the first collection device 3 is assembled to the filtering device by connecting an external thread at the lower end of the first collection device 3 to an internal thread at the upper end of the filtering device). Then the first collecting device 3 is squeezed by hand or by gravity to let the biological fluid in the first collecting device 3 enter the filtering device, after the biological fluid is filtered, the first collecting device 3 is removed, the filtering device is placed in the storage 5, and then the storage 5 is sealed by the upper cover 51 to ensure that the biological fluid filtrate in the storage 5 is not polluted.

Example 3

In one embodiment, the present application provides a filtrate collecting system, which includes a second collecting device 4 and one or more filtering devices of any one of embodiments 1, wherein the second collecting device 4 is provided with a third cavity 41, the third cavity 41 is provided with a fifth opening 42, the second collecting device 4 is detachably connected to the filtering device, and when the second collecting device 4 is connected to the filtering device, the second opening 13 is communicated with the fifth opening 42. It will be appreciated that in the above described embodiments, the filtration system may incorporate one or more filtration devices according to the actual need, wherein different filtration devices may be provided with different types of filtration layers, thereby achieving multi-level filtration.

In one of the embodiments, the second collecting device 4 is provided with a piston 43. In one embodiment, a handle 44 is provided on the piston 43. In one embodiment, one end of the piston 43 is opposite to the fifth opening 42, and the other end of the piston 43 is provided with a handle 44. The above scheme provides power for biological liquid filtration by arranging the piston 43. The specific process is as follows: the second collecting device 4 is connected with the filtering device, then the piston 43 is pulled out, so that a vacuum environment is formed in the waste liquid bottle, the biological fluid is forced into the second collecting device 4 through the filtering barrel by air pressure, and the biological fluid is filtered.

In one embodiment, the body 1 is provided with a second fixing structure 15, and the second fixing structure 15 is detachably connected with the second collecting device 4. In one embodiment, the second fixing structure 15 is one or more of a snap structure, a bolt structure, a thread structure and a magnetic structure. In one embodiment, the second fixing structure 15 is an external thread on the body 1, located at the second opening 13, and the second collecting device 4 is provided with an internal thread matching the second fixing structure 15.

Example 4

In one embodiment, the present application provides a filtration storage system comprising a storage device and one or more of the filtration devices of any of embodiments 1; the storage device comprises a reservoir 5 and an upper cover 51, the filter device is placed in the reservoir 5, and the upper cover 51 is used for sealing the reservoir 5. In one embodiment, the reservoir 5 is provided with a protective liquid. The solution provides power for the filtration of the biological fluid by providing the piston 43 on the second collecting device 4 and by pulling the piston 43. It will be appreciated that although normally one storage means is used to store one filter means as shown in figure 5, in some particular cases the storage means may be expanded in volume to accommodate a plurality of filter means.

More specifically: the user opens the second sealing cover 36 to open the fourth opening 35, adds the biological fluid to the first collection unit 3, then covers the second sealing cover 36, and observes the volume of the biological fluid, and if the volume is not satisfactory, the user can open the first sealing cover 34 to make the biological fluid flow out from the third opening 32 until the volume is satisfactory. The first collecting device 3 is then connected to the filtering device and the second collecting device 4 (in one embodiment, the first collecting device 3, the filtering device and the second collecting device 4 are placed in sequence from top to bottom). Then, the piston 43 is pulled out by hand, so that the second collection means 4 forms a vacuum environment, and the air pressure forces the biological fluid through the filtering means (filter layer 2) into the second collection means 4. After the biological fluid has been filtered, the filter device is removed and inserted into the reservoir 5, which is then sealed by the upper lid 51.

It will be appreciated that in each of the embodiments described above, the filtration may be carried out by one or more of squeezing the first collection means by hand, pulling the piston to create a negative pressure, and gravity to power the passage of the liquid through the filter layer.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (27)

1. A filtering device capable of being connected in series is characterized by comprising a body (1) and a filtering layer (2), wherein a first cavity (11) is arranged on the body (1), and the first cavity (11) is provided with a first opening (12) and a second opening (13);

the filter layer (2) is arranged in the first cavity (11); the filtering device is provided with a first fixing structure (16), the filtering device is detachably connected with another filtering device through the first fixing structure (16), and when the filtering device is connected with another filtering device, a first containing cavity (11) of the filtering device is communicated with a first containing cavity (11) of the other filtering device.

2. The filtering device according to claim 1, characterized in that it is further provided with a second fixing structure (15), said second fixing structure (15) being matched to said first fixing structure (16); the filter device is detachably mounted on another filter device by the first fixing structure (16) matching with the second fixing structure (15) of another filter device.

3. A filter device according to claim 2, wherein the second fixing structure (15) is one or more of a snap structure, a bolt structure and a magnetic connection structure.

4. The filter device according to claim 2, wherein the first fixing structure (16) is one or more of a snap structure, a thread structure and a magnetic connection structure.

5. A filter device as claimed in claim 2, wherein the first fixing structure (16) is provided at a first opening and the second fixing structure (15) is provided at a second opening.

6. The filter device according to claim 1, which is installed in a centrifuge tube, wherein the body (1) is provided with a fixing member (14), and the body (1) is installed on the centrifuge tube through the fixing member (14).

7. The filtration device according to claim 6, wherein the fixing member (14) is a snap-fit member, and the body (1) is snap-fitted to the centrifugal tube by the fixing member (14).

8. A filter device as claimed in claim 6, characterised in that the fixing element (14) is a lip.

9. A filter device as claimed in claim 6, characterised in that the body (1) tapers in the direction from the first opening (12) to the second opening (13).

10. A filter device as claimed in claim 6, wherein the first opening (12) is parallel to the second opening (13) and the first opening (12) is located above the second opening (13).

11. A filter system, characterized in that it comprises a first collecting device (3) and one or more filter devices according to any one of claims 1-3, said first collecting device (3) being provided with a second receptacle (31), said second receptacle (31) being provided with a third opening (32), said first collecting device (3) being detachably connected to the filter device, and said first opening (12) being in communication with the third opening (32) when the first collecting device (3) is connected to the filter device.

12. A filtering system according to claim 11, wherein the first collecting device (3) is provided with a third fixed structure (33), the first fixed structure (16) being removably connected to the third fixed structure (33);

preferably, the first fixing structure (16) is provided at the first opening (12) and the third fixing structure (33) is provided at the third opening (32).

13. A filtering system according to claim 11, wherein the first collecting device (3) further comprises a first sealing cover (34), the first sealing cover (34) being removably mounted on the third opening (32).

14. A filter system according to claim 13, wherein the first sealing cover (34) is mated with a third fixing structure (33).

15. A filtering system according to claim 11, wherein the second volume (31) further comprises a fourth opening (35), and the first collecting device (3) further comprises a second sealing cover (36), the second sealing cover (36) being removably mounted on the fourth opening (35).

16. A filter system according to claim 15, wherein the opening area of the fourth opening (35) is equal to or larger than the opening area of the third opening (32).

17. A filter system according to claim 11, wherein the first collecting device (3) is of an elastic and/or telescopic construction.

18. A filter system according to claim 11, wherein the material of the first collecting device (3) is one or more of plastic, memory metal, alloy.

19. A filter system according to claim 11, wherein the first collecting device (3) is partly or wholly of pleated construction.

20. A filter system according to claim 11, wherein the first collecting means (3) is of a transparent construction.

21. A filter system according to claim 11, wherein the first collecting device (3) is provided with a scale.

22. A filtrate collection system, comprising a second collection means (4) and one or more filter devices according to any of claims 1-10, said second collection means (4) being provided with a third receptacle (41), said third receptacle (41) being provided with a fifth opening (42), said second collection means (4) being detachably connected to the filter device, and said second opening (13) being in communication with the fifth opening (42) when the second collection means (4) is connected to the filter device.

23. The filtrate collection system of claim 22 wherein the second collection means (4) is provided with a piston (43).

24. The filtrate collection system of claim 23 wherein said piston (43) is provided with a handle (44).

25. The filtrate collection system of claim 23 wherein one end of said piston (43) is opposite said fifth opening (42), the other end of said piston (43) being provided with a handle (44).

26. A filtration storage system comprising a storage device and a filtration device according to any one of claims 1 to 10; the storage device comprises a storage (5) and an upper cover (51), the filter device can be placed in the storage (5), and the upper cover (51) is used for sealing the storage (5).

27. A filter storage system according to claim 26, wherein the reservoir (5) is provided with a protective liquid.

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