Screw cap type deformable filtering device for preventing empty suction and blockage of reagent needle

Abstract

The utility model discloses a screw cap type deformable filtering device for preventing empty suction and blockage of a reagent needle, which comprises a screw cap, a hollow part is arranged in the middle of the screw cap, a latex connecting piece is arranged in the hollow part, a polytetrafluoroethylene film is arranged in the middle of the latex connecting piece, and a core accessory of the filtering device is a needle-shaped polytetrafluoroethylene film. Due to the excellent chemical characteristics, the filter material is suitable for reagents with various chemical properties, and the filter material can stably play a role in filtering acidic, alkaline and organic reagents. Under extreme environments such as high temperature and low temperature, normal work can be ensured, and the filtering effect cannot be influenced by environmental factors. The precise aperture design can effectively intercept tiny bubbles and particles which may cause empty suction and blockage of the reagent needle, so that the purity of a reagent extracted by the reagent needle is extremely high, an accurate and reliable reagent is provided for in-vitro diagnosis and detection, and the accuracy of a detection result is ensured.

Description

Technical Field

[0001] This utility model relates to the field of in vitro diagnostic medical testing instruments, and in particular to a screw-cap deformable filter device for preventing reagent needle from drawing in empty reagents and clogging the needle. Background Technology

[0002] In vitro diagnostic instruments are used for human sample testing, requiring high precision, rapid response, and good repeatability. The accuracy of reagent needle quantification directly affects test results and significantly impacts the instrument's performance. Therefore, in vitro diagnostic instruments must strictly control reagent needle quantification. Many factors influence reagent needle quantification, including the precision of the power element, the pressure resistance and reaction time of the actuator, and the sealing of accessories. However, the most significant factor affecting quantification is needle cavitation or clogging. During cavitation, the needle draws in excessive air, resulting in no sample or reagent being drawn, leading to significant deviations in the final test results. During clogging, the needle is sealed, causing insufficient or zero reagent extraction. Simultaneously, the tubing is vacuumed, allowing blockages to enter the needle body from the needle tip. Since the inner diameter of reagent needles is typically less than 0.5 mm, internal blockages are difficult to clean and can render the needle unusable. This not only increases maintenance and replacement costs but also distorts test results. Therefore, preventing needle cavitation and clogging is essential and of significant practical importance.

[0003] Common methods for removing reagent bubbles include manual scraping and using needle filters. Manual scraping is inefficient and incomplete. Needle filters are disposable membrane devices used to remove bubbles or particulate impurities from reagent liquids and samples before analysis using methods such as HPLC, ion chromatography, gas chromatography, ICP, and dissolution testing. Proper filtration improves the quality and consistency of analytical results and reduces instrument downtime. However, existing needle filters are fixed devices and not suitable for the mechanical, fully automated reagent needles of diagnostic instruments. They require the use of disposable syringes, limiting their application. Furthermore, the need for manual reagent filtration significantly impacts efficiency. Additionally, the reagent solution filtered manually using a needle filter needs to be re-injected into the instrument's reagent bottle, a process that generates foam again, resulting in poor performance.

[0004] In conclusion, it is urgent to develop a filtration device that can effectively prevent reagent needle clogging, is easy to operate, and has wide applicability. Utility Model Content

[0005] The purpose of this invention is to provide a screw-cap deformable filter device that prevents reagent needle from drawing in empty liquid and from becoming clogged. This device can solve the problem of drawing in empty liquid and causing clogged needles in very small liquid volumes, and ensure the accuracy and stability of reagent needle extraction during in vitro diagnostic testing.

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

[0007] A screw-cap deformable filter device for preventing reagent needle cavitation and needle blockage includes a screw cap, a hollow section in the middle of the screw cap, a latex connector in the hollow section, and a polytetrafluoroethylene membrane in the middle of the latex connector.

[0008] The outer surface of the screw cap of this invention is provided with anti-slip texture.

[0009] The latex connector described in this invention is made of highly elastic latex material.

[0010] The polytetrafluoroethylene membrane of this invention has a pore size of 0.2 μm.

[0011] The screw cap and the latex connector of this invention are connected and fixed by an adhesive.

[0012] In summary, the advantages of this utility model over the prior art are:

[0013] This invention addresses the shortcomings of existing in vitro diagnostic medical testing instruments. Through its structural design, it offers the following advantages: Installation on reagent bottles via a screw cap eliminates the need for complex tools; users can easily install and disassemble the device simply by manually screwing it on. The latex connecting the filter membrane and the cap holder possesses high elasticity and flexibility, perfectly matching the high-intensity mechanical movements of the reagent needle. Regardless of the number of punctures and extractions, the latex connector can flexibly deform, maintaining a stable relative position between the filter membrane and the reagent needle, ensuring effective filtration with each reagent extraction. This extends the lifespan of the filtration device and reduces the cost of frequent component replacements. The core component of the filtration device is a needle-shaped polytetrafluoroethylene membrane, whose excellent chemical properties make it suitable for reagents of various chemical properties, including acidic, alkaline, and organic reagents, ensuring stable filtration. It also maintains normal operation even in extreme environments such as high and low temperatures, without environmental factors affecting the filtration effect. Its precise aperture design can effectively intercept tiny air bubbles and particles that may cause the reagent needle to malfunction and become clogged, ensuring that the reagent extracted by the reagent needle has extremely high purity, providing accurate and reliable reagents for in vitro diagnostic testing, and guaranteeing the accuracy of test results. Attached Figure Description

[0014] Figure 1 This is a perspective view of the present utility model;

[0015] Figure 2 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0016] 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.

[0017] Please see Figures 1-2 This utility model provides a screw-cap deformable filter device to prevent reagent needle from being drawn in dry and blocked, including a screw cap 1, a hollow part in the middle of the screw cap 1, a latex connector 2 in the hollow part, and a polytetrafluoroethylene membrane 3 in the middle of the latex connector 2.

[0018] The outer surface of the screw cap 1 of this utility model is provided with anti-slip texture.

[0019] Screw Cap 1: The screw cap designed in this utility model is a key component connecting the entire filtration device to the reagent bottle. It is circular in shape and features anti-slip textures on the outside. These textures, in the form of raised or recessed areas, are evenly distributed on the outer surface of the screw cap, facilitating manual screwing operation. Even with wet hands or while wearing gloves, force can be easily applied. The inner wall of the screw cap has a threaded structure that precisely matches the mouth of the reagent bottle. With a simple screwing action, it can be tightly fixed to the reagent bottle, enabling quick installation and disassembly of the device. This is crucial for ensuring the continuous operation of in vitro diagnostic medical testing instruments, significantly saving time and costs when the instrument requires frequent reagent changes or equipment maintenance. Furthermore, the bottom of the screw cap has an integrally formed annular sealing protrusion made of highly elastic rubber. When the screw cap is tightened onto the reagent bottle, the sealing protrusion fits tightly against the fine uneven surface of the bottle mouth, utilizing the elastic deformation properties of rubber to form a reliable sealing interface, effectively preventing reagent leakage and ensuring the safety and stability of the reagent during storage and extraction.

[0020] The latex connector 2 described in this utility model is made of high-elasticity latex material;

[0021] The latex connector 2 is located within the hollow portion of the screw cap. It is made of latex material with high elastic modulus and good flexibility, and is in the form of a hollow tube. One end is firmly connected to the inner wall of the screw cap with a strong adhesive, ensuring that it will not loosen or detach during use. The other end is used to connect to the polytetrafluoroethylene (PTFE) membrane, also using a reliable adhesive method to ensure a tight connection. The diameter of the internal channel of the hollow tube is 0.5-1.5 mm larger than the maximum outer diameter of the reagent needle. This design provides sufficient insertion space for the reagent needle to pass smoothly through the latex connector to the PTFE membrane for reagent extraction. Furthermore, during the reciprocating and rotating movements of the reagent needle driven by the instrument, the redundant space inside the hollow tube structure provides adequate buffering, effectively preventing scratches, collisions, and other damage to the reagent needle caused by motion interference, thus extending the service life of the reagent needle. Moreover, when the reagent needle is driven by the in vitro diagnostic instrument to perform high-frequency, large-amplitude, high-intensity mechanical activities, the latex connecting component can elastically deform synchronously to ensure that the polytetrafluoroethylene membrane and the reagent needle maintain a stable relative position relationship. This not only does not hinder the normal puncture and extraction of the reagent needle, but also ensures the effective functioning of the filtration function, thus enabling repeatability.

[0022] The polytetrafluoroethylene membrane 3 of this invention has a pore size of 0.2 μm;

[0023] As a core component of filtration devices, the PTFE membrane 3 possesses excellent chemical stability due to its unique chemical structure. It does not undergo chemical reactions or deterioration when in contact with various acidic, alkaline, and organic reagents. It exhibits superior corrosion resistance, resisting long-term reagent erosion. It also provides excellent sealing, preventing unfiltered reagents from bypassing. Furthermore, it has high lubricity and non-stickiness, preventing impurities from adhering and accumulating. Its electrical insulation ensures safety when used near electronic components. It withstands high temperatures up to 260℃ and low temperatures down to -200℃, enabling normal operation under diverse environmental conditions. It also boasts excellent anti-aging resistance, maintaining its performance over extended use. Furthermore, it is insoluble in any solvent, effectively intercepting air bubbles and tiny particulate impurities in reagents. It provides outstanding filtration for various types of reagents, ensuring the purity of reagents extracted by the reagent needle, thus possessing applicability, stability, and effectiveness. Its pore size ranges from 0.1 to 5 micrometers. By precisely controlling the pore size, it accurately captures and filters out tiny air bubbles and particles that can cause the reagent needle to become clogged. It strictly controls the quality of the reagent entering the reagent needle and ensures that the reagent extracted by the reagent needle meets the stringent requirements of in vitro diagnostic testing instruments for accuracy, sensitivity and repeatability, thus providing a solid guarantee for precision medical testing.

[0024] The screw cap 1 and the latex connector 2 of this invention are connected and fixed by adhesive.

[0025] When preparing the in vitro diagnostic medical testing instrument for use, the operator holds the screw cap 1, aligns it with the mouth of the reagent bottle, and slowly screws it clockwise. The anti-slip texture on the outer surface of the screw cap increases friction, allowing the cap to be smoothly screwed into the mouth of the reagent bottle until the sealing protrusion at the bottom of the screw cap tightly fits against the mouth 5 of the reagent bottle. At this point, a noticeable increase in turning resistance can be felt, indicating that the device is installed correctly. After installation, a simple sealing test can be performed, such as injecting a small amount of air into the reagent bottle and observing whether any bubbles emerge around the mouth of the bottle. If no bubbles emerge, it indicates that the device is installed and sealed well.

[0026] When reagent needle 4 punctures the reagent bottle to extract reagent under the drive of the instrument, reagent needle 4 first passes through the hollow tubular channel of the latex connector. Due to the reasonable design of the channel diameter, the reagent needle can be inserted smoothly without scratching the latex connector. During the extraction process, the reagent needle moves up and down and rotates frequently. The latex connector, with its high elasticity and flexibility, deforms synchronously, always maintaining the relative position of the PTFE membrane and the reagent needle stable. This allows the PTFE membrane to continuously and effectively filter the reagent, intercepting air bubbles and small particulate impurities.

[0027] The pore size of the polytetrafluoroethylene membrane is precisely controlled between 0.1 and 5 micrometers to ensure that only pure reagents can pass through the membrane into the reagent needle, preventing the reagent needle from being blocked due to air bubbles or impurities.

[0028] The foregoing has shown and described the basic principles and main features of this utility model, as well as its advantages. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A screw-cap type deformable filter device for preventing reagent needle cavitation and needle blockage, characterized in that: Includes a screw cap (1), the screw cap (1) has a hollow part in the middle, a latex connector (2) is provided in the hollow part, and a polytetrafluoroethylene film (3) is provided in the middle of the latex connector (2).

2. The screw-cap deformable filter device for preventing reagent needle cavitation and needle blockage according to claim 1, characterized in that: The outer surface of the screw cap (1) is provided with anti-slip texture.

3. The screw-cap deformable filter device for preventing reagent needle cavitation and needle blockage according to claim 2, characterized in that: The latex connector (2) is made of highly elastic latex material.

4. The screw-cap deformable filter device for preventing reagent needle cavitation and needle blockage according to claim 3, characterized in that: The polytetrafluoroethylene membrane (3) has a pore size of 0.2 μm.

5. The screw-cap deformable filter device for preventing reagent needle cavitation and needle blockage according to claim 4, characterized in that: The screw cap (1) and the latex connector (2) are connected and fixed by adhesive.

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