A disposable rapid filtration device

Abstract

The utility model discloses a kind of disposable rapid filtration devices, including the connecting portion connected with external syringe or needle cylinder and the liquid suction part for extracting liquid, the connecting portion and liquid suction part are interconnected, upper cavity is opened in the inside of connecting portion, lower cavity is opened in the inside of liquid suction part, upper cavity and lower cavity are interconnected, the top of lower cavity is fixedly provided with annular filter membrane, upper cavity includes the conical cavity of upper side and the valve cavity of lower side, the inner diameter of conical cavity gradually decreases from top to bottom, a movable one-way ball is placed in valve cavity, the inner diameter of valve cavity is greater than the inner diameter of conical cavity bottom and greater than the diameter of one-way ball, the diameter of one-way ball is greater than the annular inner diameter of filter membrane and the inner diameter of conical cavity bottom.The device is simple in structure, and multiple components need not to be assembled when operating, convenient to operate, greatly improve work efficiency, reduce operation steps and reduce pollution risk simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of biochemical experimental technology, specifically a disposable rapid filtration device. Background Technology

[0002] In analytical testing in fields such as biochemistry, pharmaceuticals, food safety, and environmental monitoring, sample filtration is an important and frequently performed pretreatment step. Its purposes include: removing particulate impurities from the sample matrix to prevent instrument clogging (such as HPLC and mass spectrometry); sterilizing liquid samples; separating molecules or cells of different sizes; and clarifying turbid samples to improve detection accuracy.

[0003] Currently, most filtration operations in laboratories rely on manual labor. Operators need to manually perform a series of steps: selecting a filter membrane with a suitable pore size, installing the filtration device (such as a syringe filter, cup filter, vacuum filter, etc.), removing the sample, applying pressure (pushing a syringe or connecting a vacuum pump), collecting the filtrate, replacing the filter membrane to prevent cross-contamination, and finally cleaning the equipment. This traditional method has significant drawbacks: it requires assembling multiple components, making the operation cumbersome and increasing the number of steps and the risk of contamination; improper pressure control during aspiration or injection may cause filtered and unfiltered liquids to mix, resulting in cross-contamination or sample failure; liquid residue may remain at the connector interface, causing sample waste, which is especially detrimental to the handling of precious samples; and the independent filter and valve assemblies make the entire device less compact, structurally fragmented, and less portable and easy to use. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the existing defects and provide a disposable rapid filtration device with a simple structure, which does not require the assembly of multiple parts during operation, is easy to operate, greatly improves work efficiency, reduces operation steps and reduces the risk of pollution, and can effectively solve the problems in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a disposable rapid filtration device, comprising a connecting part connected to an external syringe or needle and a liquid-absorbing part for extracting liquid, wherein the connecting part and the liquid-absorbing part are interconnected, the connecting part has an upper cavity, the liquid-absorbing part has a lower cavity, the upper cavity and the lower cavity are interconnected, an annular filter membrane is fixedly disposed at the top of the lower cavity, the upper cavity includes an upper conical cavity and a lower valve cavity, the inner diameter of the conical cavity gradually decreases from top to bottom, a movable one-way ball is placed in the valve cavity, the inner diameter of the valve cavity is larger than the inner diameter of the bottom end of the conical cavity and larger than the diameter of the one-way ball, the diameter of the one-way ball is larger than the annular inner diameter of the filter membrane and the inner diameter of the bottom end of the conical cavity.

[0006] As a preferred embodiment of this utility model, an annular groove is formed on the inner surface of the top end of the lower cavity, and an outer fixing ring and an inner fixing ring are respectively arranged inside the annular groove. The inner fixing ring is arranged inside the outer fixing ring, and the filter membrane is fixedly arranged between the inner fixing ring and the outer fixing ring. A plurality of through holes are evenly formed on the inner surface of the inner fixing ring.

[0007] As a preferred technical solution of this utility model, an indentation is fixedly provided on the upper part of the inner surface of the inner fixing ring, and the indentation is inclined downward towards its center.

[0008] As a preferred embodiment of this utility model, a plurality of inclined support rods are evenly arranged on the lower surface of the top end of the valve cavity, and the inclined support rods are all inclined downward toward the axis of the upper cavity.

[0009] As a preferred embodiment of this utility model, the entrance of the upper cavity is configured as a Luer interface.

[0010] As a preferred embodiment of this utility model, the connecting part is provided with a gripping part, and the outer side of the gripping part is provided with anti-slip texture.

[0011] Compared with existing technologies, the advantages of this invention are: the device has a simple structure, does not require the assembly of multiple parts during operation, is easy to operate, greatly improves work efficiency, reduces operating steps, and lowers the risk of contamination. Furthermore, this device perfectly realizes the functions of two one-way valves for liquid suction and discharge through the up-and-down movement of a one-way ball, and integrates them with the filter membrane within the connection part and suction part of the needle holder, resulting in an extremely compact structure that improves portability and ease of use. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 This utility model Figure 2 A schematic diagram of the side view structure; Figure 4 This is a schematic diagram of the internal structure of the present invention after the removal of the one-way ball; Figure 5 This utility model Figure 4 A side view structural diagram.

[0013] In the figure: 1 Connecting part, 2 Liquid suction part, 3 Upper chamber, 4 Lower chamber, 5 Anti-slip texture, 6 One-way ball, 7 Filter membrane, 8 Drainage chamber, 9 Outer fixing ring, 10 Inner fixing ring, 11 Through hole, 12 Recessed part, 13 Inclined support rod. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Please see Figure 1-5 This utility model provides a technical solution: a disposable rapid filtration device, including a connecting part 1 connected to an external syringe or needle and a liquid suction part 2 for extracting liquid. The connecting part 1 and the liquid suction part 2 are interconnected. The connecting part 1 has an upper cavity 3 inside, and the liquid suction part 2 has a lower cavity 4 inside. The upper cavity 3 and the lower cavity 4 are interconnected and serve as channels for liquid extraction and discharge.

[0016] An annular filter membrane 7 is fixedly installed at the top of the lower chamber 4. The filter membrane 7 can be replaced with membranes of different pore sizes as needed, such as 0.22μm for sterilization filtration.

[0017] The upper chamber 3 includes an upper conical cavity and a lower valve cavity. The inner diameter of the conical cavity gradually decreases from top to bottom. A movable one-way ball 6 is placed inside the valve cavity. The inner diameter of the valve cavity is larger than the inner diameter of the bottom of the conical cavity and larger than the diameter of the one-way ball 6. The diameter of the one-way ball 6 is larger than the annular inner diameter of the filter membrane 7 and the inner diameter of the bottom of the conical cavity. During liquid aspiration: the user pulls the piston rod of the syringe or syringe upward, generating negative pressure in the upper chamber 3. Under the pressure, the liquid in the lower chamber 4 pushes the one-way ball 6 upward, opening the annular inlet channel of the filter membrane 7. The external liquid passes through the lower chamber 4 and the valve cavity in sequence, enters the upper chamber 3 from the circumference of the one-way ball 6, and finally passes through the syringe or syringe. During this process, the filter membrane 7 does not filter the liquid.

[0018] During the drainage process: The user pushes the piston rod of the syringe or syringe downwards, applying pressure to the liquid to be filtered within the syringe or syringe. The liquid pressure pushes the one-way ball 6 downwards, pressing it tightly against the annular inner diameter of the filter membrane 7, thus sealing the channel at that point. At this time, the liquid to be filtered can only be pushed out unidirectionally and stably from the filter membrane 7. Since the outlet channel is sealed, the liquid cannot flow upwards back, physically eliminating the possibility of liquid backflow and ensuring the purity of the filtration. It is particularly suitable for occasions requiring sterile filtration and prevention of cross-contamination, such as cell culture, chromatographic analysis, sterile preparation, and small-volume sample processing in the laboratory.

[0019] This device has a simple structure and does not require the assembly of multiple parts during operation, making it convenient to operate and greatly improving work efficiency. It also reduces operational steps and lowers the risk of contamination. Furthermore, the device perfectly integrates the functions of two one-way valves (liquid suction and discharge) through the up-and-down movement of a one-way ball 6, which is integrated with the filter membrane 7 within the connection part 1 of the needle holder and the liquid suction part 2. This extremely compact structure enhances portability and ease of use.

[0020] The integrated design of this device eliminates dead cavities in external connectors, minimizing the residue and waste of precious samples.

[0021] Like the filter membrane 7, the one-way ball 6 can be made of the appropriate material according to the liquid to be filtered, and its density is also matched with the corresponding liquid to ensure that it can reliably open and close under working pressure, and will not be blocked by the filter membrane 7 during filtration and drainage, and will float up under the buoyancy of the liquid remaining in the valve cavity.

[0022] In a preferred embodiment, an annular groove is formed on the inner surface of the top of the lower cavity 4. An outer fixing ring 9 and an inner fixing ring 10 are respectively arranged inside the annular groove. The inner fixing ring 10 is positioned inside the outer fixing ring 9. The filter membrane 7 is ultrasonically welded between the inner fixing ring 10 and the outer fixing ring 9, improving the sealing effect. The outer fixing ring 9 and the inner fixing ring 10 support the filter membrane 7, and a drainage chamber 8 is formed between them for the filtered liquid to pass through. After the one-way ball 6 blocks the annular channel of the filter membrane 7, the squeezed-out filtered liquid enters the drainage chamber 8 through the filter membrane 7, and then smoothly exits into the lower cavity 4 through several evenly spaced through-holes 11 on the inner surface of the inner fixing ring 10. When extracting liquid, due to the presence of the filter membrane 7, the liquid does not pass through the drainage chamber 8 from the filter membrane 7, but instead passes through the annular channel of the filter membrane 7 (at this time, the one-way ball 6 is drawn to the upper part of the valve cavity under negative pressure).

[0023] In a preferred embodiment, an indentation 12 is fixedly provided on the upper part of the inner surface of the inner fixing ring 10. The indentation 12 is inclined downward towards its center and is made of silicone or rubber, so that the plane of the inner fixing ring 10 at the center is lowered, forming a concave surface that matches the one-way ball 6. When the one-way ball 6 is not subjected to negative pressure suction, it can automatically roll into the indentation 12 under the action of gravity and liquid thrust, and seal the channel to prevent unfiltered liquid from entering the filtered liquid collection container through the channel.

[0024] In a preferred embodiment, to prevent the one-way ball 6 from completely blocking the inlet of the upper chamber 3, several inclined support rods 13 are evenly arranged on the lower surface of the top of the valve chamber. All inclined support rods 13 are inclined downwards towards the axis of the upper chamber 3. The circumferential diameter of the circle formed by the bottom ends of all inclined support rods 13 is less than or equal to the minimum diameter of the conical portion. When drawing liquid, the one-way ball 6, under negative pressure, moves upwards to its highest point and is then stopped by the inclined support rods 13, preventing further upward movement and avoiding blocking the inlet of the upper chamber 3, thus preventing the liquid from being drawn out. The drawn liquid enters the upper chamber 3 through the channel between the inclined support rods 13, and then enters the external syringe or needle.

[0025] Optionally, the inlet of the upper cavity 3 is configured as a Luer interface, which can be directly connected to a syringe or needle, making the connection more convenient.

[0026] Optionally, the connecting part 1 is provided with a gripping part, and the outer side of the gripping part is provided with anti-slip texture. The device is more convenient to operate by gripping it through the gripping part.

[0027] The parts not disclosed in this utility model are all prior art, and their specific structures, materials, and working principles will not be described in detail. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A single use, rapid filtration device, characterized by: It includes a connecting part (1) for connecting to an external syringe or syringe and a liquid suction part (2) for drawing liquid. The connecting part (1) and the liquid suction part (2) are interconnected. The connecting part (1) has an upper cavity (3) inside and the liquid suction part (2) has a lower cavity (4) inside. The upper cavity (3) and the lower cavity (4) are interconnected. An annular filter membrane (7) is fixedly installed at the top of the lower cavity (4). The upper cavity (3) includes an upper conical cavity and a lower valve cavity. The inner diameter of the conical cavity gradually decreases from top to bottom. A movable one-way ball (6) is placed in the valve cavity. The inner diameter of the valve cavity is greater than the inner diameter of the bottom end of the conical cavity and greater than the diameter of the one-way ball (6). The diameter of the one-way ball (6) is greater than the annular inner diameter of the filter membrane (7) and the inner diameter of the bottom end of the conical cavity.

2. The disposable rapid filtration device according to claim 1, characterized in that: The inner surface of the top end of the lower cavity (4) is provided with an annular groove. An outer fixing ring (9) and an inner fixing ring (10) are respectively provided inside the annular groove. The inner fixing ring (10) is located inside the outer fixing ring (9). The filter membrane (7) is fixedly located between the inner fixing ring (10) and the outer fixing ring (9). A number of through holes (11) are evenly provided on the inner surface of the inner fixing ring (10).

3. The disposable rapid filtration device according to claim 2, characterized in that: An indentation (12) is fixedly provided on the upper part of the inner surface of the inner fixing ring (10), and the indentation (12) is inclined downward towards its center.

4. The disposable rapid filtration device according to claim 1, characterized in that: Several inclined support rods (13) are evenly arranged on the lower surface of the top of the valve cavity. The inclined support rods (13) are all inclined downwards towards the axis of the upper cavity (3).

5. A disposable rapid filtration device according to claim 1, characterized in that: The entrance of the upper cavity (3) is configured as a Luer interface.

6. The disposable rapid filtration device according to claim 1, characterized in that: The connecting part (1) is provided with a gripping part, and the outer side of the gripping part is provided with anti-slip texture.

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