CN211537801U - Pipettor suction head that has filtering capability - Google Patents

Abstract

The utility model relates to a pipettor suction head that has filtering capability, including imbibition syringe needle and suction head body, the annular groove has been seted up to the lower part of suction head body inside wall, and suction head body lower part is located annular groove department and is provided with filter equipment, and filter equipment is fixed with annular groove joint. The utility model discloses can utilize pipettor suction head to filter the insoluble material of interference experiment in with the sample when absorbing the sample and move the liquid, guarantee the experiment precision, the simple operation simultaneously, low cost.

Description

Pipettor suction head that has filtering capability

Technical Field

The utility model relates to a medical science check out test set technical field, concretely relates to pipettor suction head that has filtering capability.

Background

Pipettes are increasingly widely used in current medicine and immunology. Particularly, for medical detection experiments, when a small amount or trace amount of liquid needs to be sucked in the experimental process, only the high-precision liquid suction device, namely a liquid suction device, can meet the requirements of the experiments. A disposable pipette tip is an important component of a pipette and also a component which has great influence on the pipette effect.

As shown in fig. 1, a conventional pipette tip includes two parts, a pipette tip and a tip body. When the test sample is tested, many insoluble substances in the sample interfere the test, such as blood lipid in the sample, and part of tissue in the tissue sample, and if the insoluble substances cannot be treated, an unprepared result is finally obtained, which affects the final result judgment. The removal of these insoluble materials is usually done by centrifugation, which requires additional handling and additional equipment. The operation is troublesome and the time is wasted.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to the technical problem who exists among the prior art, provide a pipettor suction head that has filtering capability, can utilize pipettor suction head to filter the insoluble material that disturbs the experiment in with the sample when absorbing the sample and move the liquid, guarantee the experiment precision, the simple operation simultaneously, low cost.

The utility model provides an above-mentioned technical problem's technical scheme as follows: the utility model provides a pipettor suction head with filtering capability, includes imbibition syringe needle and suction head body, the annular groove has been seted up to the lower part of suction head body inside wall, and suction head body lower part is located annular groove department and is provided with filter equipment, and filter equipment and annular groove joint are fixed.

The utility model has the advantages that: the filter device is arranged in the suction head body, so that the liquid sample can be ensured to be smoothly sucked, but impurities which are insoluble in the sample can be filtered out by the filter device in the pipetting process.

On the basis of the technical scheme, the utility model discloses can also do following improvement.

Furthermore, the filtering device comprises an upper fixing sheet and a filtering membrane, and the upper fixing sheet is fixedly connected with the filtering membrane. Or the filtering device comprises a lower fixing sheet and a filtering membrane, and the lower fixing sheet is fixedly connected with the filtering membrane. Or the filtering device comprises an upper fixing sheet, a lower fixing sheet and a filtering membrane, and the filtering membrane is clamped between the upper fixing sheet and the lower fixing sheet.

The beneficial effect of adopting the further scheme is that: the filter membrane is adopted for filtration, so that the method is relatively flexible, and filter membranes with different pore diameters can be selected according to the condition of a liquid sample of a specific experiment; the filter membrane can be conveniently fixed by arranging the fixing sheet.

Furthermore, the pipette tip further comprises a one-way valve, and the one-way valve is fixedly arranged on the filtering device in a penetrating way.

The beneficial effect of adopting the further scheme is that: in the imbibition, because the negative pressure state in the pipettor, the check valve does not have any to block, and filter equipment has the resistance to the liquid sample, so the liquid sample can be in a large number get into the suction head body through the check valve, and in the flowing back, be the malleation state in the pipettor, the check valve lock dies, and the liquid sample can only pass through filter equipment, and insoluble impurity is filtered, adopts this scheme, and after the flowing back, the impurity content in the liquid sample can further reduce.

Furthermore, the one-way valve is arranged and fixed in the middle of the filtering device in a penetrating way.

The beneficial effect of adopting the further scheme is that: is convenient for production and processing, and can further ensure the smoothness of liquid absorption.

Drawings

Fig. 1 is a schematic diagram of a prior art pipette tip;

FIG. 2 is a schematic cross-sectional view of a suction head body according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a filtering apparatus according to an embodiment of the present invention;

in the drawings, the components represented by the respective reference numerals are listed below:

1. the suction syringe needle, 2, the suction head body, 3, the annular groove, 4, the filter device, 4a, the upper fixing sheet, 4b, the lower fixing sheet, 4c, the filter membrane, 5, the one-way valve.

Detailed Description

The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.

As shown in fig. 1, the utility model relates to a pipette tip capable of mixing uniform samples and preventing suck back, which comprises a pipette tip 1 and a tip body 2. The nozzle body 2 is preferably cylindrical and has a smaller diameter towards the lower part.

As shown in figure 2, the lower part of the inner side wall of the suction head body 2 is provided with an annular groove 3. As shown in figure 3, a filtering device 4 is arranged at the position of the annular groove 3 at the lower part of the suction head body 2, and the filtering device 4 is clamped and fixed with the annular groove 3. The filter means 4 is preferably a porous type of filter material, the pore size of which can be selected as required for a particular experiment and for filtration.

The filter device 4 is arranged in the sucker body 2, so that the liquid sample can be ensured to be smoothly sucked, but impurities which are insoluble in the sample can be filtered out by the filter device 4 in the pipetting process.

The utility model discloses still provide modified technical scheme, in modified technical scheme, filter equipment 4 includes filter membrane 4b and stationary blade.

The filter membrane 4b is considered to be low in price and complete in size, and the aperture can be selected according to the requirement. However, since the filter membrane 4b is soft and fragile, and is not easily fixed, the filter membrane 4b is easily assembled by arranging the fixing piece having a hard texture and permeable liquid for fixing the filter membrane 4 b.

Specifically, the scheme has three arrangement modes. The filtering device 4 comprises an upper fixing sheet 4a and a filtering membrane 4c, and the upper fixing sheet 4a and the filtering membrane 4c are fixedly connected. Or the filtering device 4 comprises a lower fixing sheet 4b and a filtering membrane 4c, and the lower fixing sheet 4b is fixedly connected with the filtering membrane 4 c.

Most preferably, the filtering device 4 includes an upper fixing sheet 4a, a lower fixing sheet 4b and a filter membrane 4c, and the filter membrane 4c is sandwiched between the upper fixing sheet 4a and the lower fixing sheet 4 b.

The filter membrane 4c can be effectively protected by the upper fixing piece 4a and the lower fixing piece 4 b.

The utility model also provides a modified technical scheme, in modified technical scheme, the pipettor suction head is still including check valve 5, check valve 5 wears to establish and fixes on filter equipment 4. Openings may be provided in the filter device 4 for fitting the non-return valve 5.

The present embodiment considers that the filtering device 4 is provided separately, and although the filtering device can filter impurities, a part of the liquid sample adheres to the bottom of the filtering device 4 during the liquid transferring process, and the part of the liquid is not filtered. During liquid drainage, the liquid sample is drained along with pressure and enters an experimental link.

The provision of the check valve 5 effectively solves this problem. During liquid suction, as the liquid suction device is in a negative pressure state, the one-way valve 5 is not blocked, and the filtering device 4 has resistance to the liquid sample, a large amount of liquid sample can enter the suction head body 2 through the one-way valve 5; and during the flowing back, be the malleation state in the pipettor, check valve 5 locks, and liquid sample can only pass through filter equipment 4, and insoluble impurity is filtered. This scheme can effectively reduce the volume of the liquid sample of adhesion in 4 bottoms of filter equipment, further promotes the filter effect.

Preferably, only one check valve 5 is arranged and fixed in the middle of the filtering device 4 in a penetrating way.

This scheme is convenient for filter equipment 4's production and processing, also can further guarantee the smooth and easy of imbibition.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims (5)

1. The utility model provides a have filtering capability's pipettor suction head, includes imbibition syringe needle (1) and suction head body (2), its characterized in that: annular groove (3) have been seted up to the lower part of suction head body (2) inside wall, and suction head body (2) lower part is located annular groove (3) department and is provided with filter equipment (4), and filter equipment (4) are fixed with annular groove (3) joint, pipettor suction head is still including check valve (5), check valve (5) are worn to establish and are fixed on filter equipment (4).

2. A filter-enabled pipette tip according to claim 1, wherein: the filtering device (4) comprises an upper fixing sheet (4a) and a filtering membrane (4c), and the upper fixing sheet (4a) is fixedly connected with the filtering membrane (4 c).

3. A filter-enabled pipette tip according to claim 1, wherein: the filtering device (4) comprises a lower fixing piece (4b) and a filtering membrane (4c), and the lower fixing piece (4b) is fixedly connected with the filtering membrane (4 c).

4. A filter-enabled pipette tip according to claim 1, wherein: the filtering device (4) comprises an upper fixing sheet (4a), a lower fixing sheet (4b) and a filter membrane (4c), and the filter membrane (4c) is clamped between the upper fixing sheet (4a) and the lower fixing sheet (4 b).

5. A filter-enabled pipette tip according to claim 1, wherein: one check valve (5) is arranged and fixed in the middle of the filtering device (4) in a penetrating way.

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