Filter for a pipette

Abstract

The application relates to a filter for a pipette, which comprises a filter upper shell, a filter lower shell and a filter membrane, the filter upper shell is clamped with the filter lower shell, the filter upper shell and the filter lower shell form a cavity, the filter membrane is located in the cavity, the filter upper shell is used for being connected with the pipette, the filter lower shell is provided with a liquid outlet pipe, the liquid outlet pipe is communicated with the cavity, and the diameter of the liquid outlet pipe gradually decreases along the direction from the filter upper shell to the filter lower shell. The application has the effect that the filter can break the rubber cover pad on a sample bottle containing a sample to be tested, so that the pollution in the sample transfer process is reduced.

Description

Technical Field

[0001] This application relates to the field of laboratory instruments, and more particularly to a filter for pipettes. Background Technology

[0002] A pipette is a type of pipette commonly used in laboratories to transfer small or trace amounts of liquid. Usually, during sample pretreatment and transfer, in order to protect the instrument and reduce interference, the sample to be tested before entering the precision instrument needs to be pretreated, that is, filtered. After filtration with a disposable filter, the liquid to be tested needs to be transferred to the sample vial with a cap and gasket using a pipette tip.

[0003] Currently, Chinese utility model patent CN211274694U discloses a pipette tip and a pipette. The pipette tip includes a pipette head and a purification tip. The pipette head has a liquid aspiration channel with an installation port and a liquid aspiration port opposite to each other at both ends. The purification tip has a purification channel with an installation nozzle and a suction nozzle opposite to each other at both ends. A filter layer for purifying liquid is horizontally arranged inside the purification channel. The installation nozzle is detachably connected to the liquid aspiration port and is configured to cooperate with the liquid aspiration port. The pipette uses the above-mentioned pipette tip, and the pipette head installation port is fitted into the pipette handle. This utility model has the effect of improving the accuracy of experimental results.

[0004] Currently, the bottle opening of the sample to be tested is usually equipped with a rubber cap. The rubber cap is used to reduce the direct contact between the outside air and the sample. However, because there is a suction nozzle, the nozzle cannot puncture the rubber cap. The rubber cap needs to be opened manually, which can easily lead to contamination of the sample during the transfer process, resulting in low accuracy of subsequent test results. Utility Model Content

[0005] In order to reduce contamination during sample transfer by puncturing the rubber cap of the sample vial containing the sample, this application provides a filter for a pipette.

[0006] This application provides a filter for pipettes, which adopts the following technical solution:

[0007] A filter for a pipette includes an upper filter housing, a lower filter housing, and a filter membrane. The upper filter housing and the lower filter housing are snapped together, forming a cavity. The filter membrane is located within the cavity. The upper filter housing is used to connect to a pipette. The lower filter housing is provided with a liquid outlet tube that communicates with the cavity. The diameter of the liquid outlet tube gradually decreases from the upper filter housing to the lower filter housing.

[0008] By adopting the above technical solution, the upper filter housing and the lower filter housing form a cavity to accommodate the filter membrane. The filter membrane is used to filter the liquid in the sample bottle to be tested, reducing the influence of impurities in the liquid. The upper filter housing can be connected to a pipette to realize the detachable installation of the filter. The diameter of the outlet tube gradually decreases from the upper filter housing to the lower filter housing, and the outlet tube forms a spike-like structure. The outlet tube can be used to puncture the cap gasket on the sample bottle to be tested, reducing the contamination of the sample during the transfer process.

[0009] Optionally, the outer wall of the filter housing is provided with a flange, and the flange has a threaded groove on its outer side. The flange is used to connect with the Luer connector of the pipette.

[0010] By adopting the above technical solution, the upper filter housing is provided with a flange, and the flange is provided with a threaded groove. The flange and the threaded groove can be connected to the Luer connector of the pipette. The Luer connector is a standardized micro-volume leak-free connector, which is a commonly used connector in the medical field. By using an upper filter housing adapted to the Luer connector, the compatibility of the filter can be improved.

[0011] Optionally, the outer diameter of the end of the outlet pipe away from the lower filter housing is 0.75 mm.

[0012] By adopting the above technical solution, the outer diameter of the outlet tube, which is 0.75 mm away from the lower filter housing, is suitable for high-precision micro-volume body fluid operation experiments. This experimental scenario requires reducing sample contamination. During the sampling process, the outlet tube can be used to puncture the cap gasket on the sample bottle to be tested, reducing contamination of the sample during the transfer process.

[0013] Optionally, the outer side wall of the upper filter housing is provided with a first flange, and the outer side wall of the first flange is provided with an annular groove. The outer side wall of the lower filter housing is provided with a second flange, and the inner side wall of the second flange is provided with a snap-fit ​​ring, which is used to snap into the annular groove.

[0014] By adopting the above technical solution, the annular groove on the first flange and the snap ring on the second flange engage, which improves the connection strength between the upper filter housing and the lower filter housing, and reduces the leakage of liquid from between the upper filter housing and the lower filter housing when liquid enters the cavity.

[0015] Optionally, the lower filter housing is further provided with a edging sleeve, the edging sleeve having a C-shaped cross-section, and the inner sidewall of the edging sleeve abutting against the upper end face of the upper filter housing, the lower end face of the lower filter housing, and the outer sidewall of the second flange, respectively.

[0016] By adopting the above technical solution, the edge-sealing sleeve can be used to further improve the connection strength between the upper filter housing and the lower filter housing, and the structural strength of the upper filter housing and the lower filter housing can be improved by the edge-sealing sleeve.

[0017] Optionally, the outer wall of the edging sleeve is provided with an anti-slip strip.

[0018] By adopting the above technical solution, when it is necessary to install the filter onto or remove it from the pipette, the experimenter can hold the anti-slip strip on the outer side of the edge strip to operate. The anti-slip strip can increase the friction between the experimenter and the filter, making it easier to install or remove it from the Luer connector of the pipette.

[0019] Optionally, the upper end face of the lower filter housing is provided with an avoidance groove, and a gap is left between the filter membrane and the avoidance groove.

[0020] By adopting the above technical solution, the clearance groove ensures that the filter membrane does not adhere to the lower filter housing, thus greatly increasing the utilization area of ​​the filter membrane.

[0021] Optionally, the bottom of the clearance trough is provided with a plurality of support bars, which are distributed circumferentially along the axis of the liquid outlet pipe. The support bars abut against the filter membrane, and a flow channel for liquid flow is formed between the support bars.

[0022] By adopting the above technical solution, the support strips are used to support the filter membrane, reduce the fluctuation of the filter membrane during the filtration process, and form flow channels between the support strips, so that the liquid can smoothly enter the outlet pipe through the flow channels.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] The upper and lower filter housings form a cavity for placing the filter membrane. The diameter of the outlet tube gradually decreases from the upper to the lower filter housing. The outlet tube forms a spike-like structure and can be used to puncture the cap gasket on the sample bottle to be tested.

[0025] The annular groove on the first flange of the upper filter housing engages with the snap-fit ​​ring on the second flange of the lower filter housing, thereby improving the connection strength between the upper and lower filter housings.

[0026] The lower housing of the filter has a clearance groove, and a support bar is installed in the clearance groove. The support bar forms a flow channel for liquid flow, which improves the filtration effect of the filter membrane. Attached Figure Description

[0027] Figure 1 It is a filter used in pipettes.

[0028] Figure 2 yes Figure 1 The sectional view is used to show the mating structure of the upper and lower filter housings.

[0029] Figure 3 yes Figure 2 A schematic diagram of the fit between the lower housing and the filter membrane in the middle filtration system.

[0030] Reference numerals: 1. Upper filter housing; 11. First flange; 12. Annular groove; 2. Lower filter housing; 21. Second flange; 22. Snap-fit ​​ring; 23. Clearance groove; 24. Support bar; 3. Filter membrane; 4. Liquid outlet pipe; 5. Edge sleeve; 51. Anti-slip strip; 6. Cavity. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1 -Appendix Figure 3 This application will be described in further detail.

[0032] This application discloses a filter for a pipette. (Refer to...) Figure 1 and Figure 2 A filter for a pipette includes an upper filter housing 1, a lower filter housing 2, a filter membrane 3, an outlet tube 4, and a sealing sleeve 5. A connecting tube 13 is connected to the upper end face of the upper filter housing 1. A flange 14 is provided on the outer side wall of the connecting tube 13, and the flange 14 has a threaded groove. The flange 14 is used to connect with the Luer connector of the pipette. A first flange 11 is provided on the outer side wall of the upper filter housing 1, and an annular groove 12 is provided on the outer side wall of the first flange 11. A second flange 12 is fixedly provided on the outer side wall of the lower filter housing 2. The second flange 21 is located outside the first flange 11. The inner wall of the second flange 21 is provided with a snap ring 22, which snaps into the ring groove 12. The edge sleeve 5 is coaxially arranged with the upper filter housing 1. The cross-section of the edge sleeve 5 is C-shaped. The inner top wall of the edge sleeve 5 abuts against the upper end face of the upper filter housing 1. The inner side wall of the edge sleeve 5 abuts against the outer side wall of the second flange 21. The inner bottom wall of the edge sleeve 5 abuts against the lower end face of the lower filter housing 2. Anti-slip strips 51 are evenly distributed on the outer side wall of the edge sleeve 5.

[0033] Reference Figure 2 and Figure 3 A cavity 6 is formed between the upper filter housing 1 and the lower filter housing 2. The connecting pipe 13 is connected to the cavity 6. The filter membrane 3 is located in the cavity 6. One end of the filter membrane 3 abuts against the upper end face of the lower filter housing 2, and the other end of the filter membrane 3 abuts against the end of the first flange 11 away from the connecting pipe 13. An avoidance groove 23 is provided on the upper end face of the lower filter housing 2. The avoidance groove 23 extends along the thickness direction of the lower filter housing 2. Several support bars 24 are fixedly installed in the avoidance groove 23. The length direction of the support bars 24 is parallel to the radial direction of the lower filter housing 2. The several support bars 24 are evenly distributed circumferentially along the axis of the lower filter housing 2. The support bars 24 abut against the filter membrane 3.

[0034] Reference Figure 2 and Figure 3The outlet pipe 4 is fixedly installed on the lower end face of the filter housing 2. The outlet pipe 4 is coaxially arranged with the connecting pipe 13. The outlet pipe 4 is connected to the cavity 6. The diameter of the outlet pipe 4 gradually decreases along the direction from the filter housing 1 to the filter housing 2. The outer diameter of the end of the outlet pipe 4 away from the filter housing 2 is 0.75mm.

[0035] The implementation principle of a filter for a pipette according to an embodiment of this application is as follows: the user can first connect the filter to the Luer connector of the pipette through the flange 14 on the connecting tube 13. During the pipetting process, the filter is inserted into the sample bottle to be tested through the outlet tube 4, thereby reducing the contamination of the sample bottle. The filtered product can be directly injected into the sample collection bottle with a smaller inner diameter.

[0036] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A filter for a pipette, characterized in that: The filter includes an upper filter housing (1), a lower filter housing (2), and a filter membrane (3). The upper filter housing (1) is snapped into the lower filter housing (2), and the upper filter housing (1) and the lower filter housing (2) form a cavity (6). The filter membrane (3) is located in the cavity (6). The upper filter housing (1) is used to connect to a pipette. The lower filter housing (2) is provided with a liquid outlet pipe (4), which communicates with the cavity (6). The diameter of the liquid outlet pipe (4) gradually decreases along the direction from the upper filter housing (1) to the lower filter housing (2).

2. A filter for a pipette according to claim 1, characterized in that: The outer wall of the filter housing (1) is provided with a flange (14), and the flange (14) has a threaded groove. The flange (14) is used to connect with the Luer connector of the pipette.

3. A filter for a pipette according to claim 1, characterized in that: The outer diameter of the end of the outlet pipe (4) away from the lower filter housing (2) is 0.75 mm.

4. A filter for a pipette according to claim 1, characterized in that: The outer side wall of the upper filter housing (1) is provided with a first flange (11), and the outer side wall of the first flange (11) is provided with an annular groove (12). The outer side wall of the lower filter housing (2) is provided with a second flange (21), and the inner side wall of the second flange (21) is provided with a snap ring (22), which is used to snap into the annular groove (12).

5. A filter for a pipette according to claim 4, characterized in that: The lower filter housing (2) is also provided with a edging sleeve (5), the edging sleeve (5) has a C-shaped cross section, and the inner sidewall of the edging sleeve (5) abuts against the upper end face of the upper filter housing (1), the lower end face of the lower filter housing (2) and the outer sidewall of the second flange (21).

6. A filter for a pipette according to claim 5, characterized in that: The outer wall of the edging sleeve (5) is provided with anti-slip strips (51).

7. A filter for a pipette according to claim 1, characterized in that: The upper end face of the filter housing (2) is provided with a clearance groove (23), and the filter membrane (3) is separated from the clearance groove (23).

8. A filter for a pipette according to claim 7, characterized in that: The bottom of the clearance groove (23) is provided with several support bars (24), which are distributed circumferentially along the axis of the liquid outlet pipe (4). The support bars (24) abut against the filter membrane (3), and a flow channel for liquid flow is formed between the support bars (24).

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