CN219744859U - Pipetting suction head - Google Patents

Abstract

The utility model relates to the field of medical equipment, in particular to a liquid-transferring suction head, which comprises a liquid storage area and a liquid-transferring device action area, wherein the liquid storage area at least comprises a first liquid storage partition and a second liquid storage partition which are communicated, the liquid-transferring device action area is communicated with the end of the first liquid storage partition far away from the second liquid storage partition, and the cross section area of a cavity of the first liquid storage partition is larger than that of a cavity of the second liquid storage partition. The utility model breaks through the limitation that the traditional suction head can only be suitable for a single measuring range, can meet the requirement of a small measuring range while having a large measuring range, and is also suitable for automatic pipette equipment.

Description

Pipetting suction head

Technical Field

The utility model relates to the field of medical equipment, in particular to a pipette tip.

Background

With the rapid development of clinical examination medicine in recent years, the automation degree of related detection instruments is remarkably improved, so that the clinical examination capability is greatly improved, and consumable materials which can be well adapted to the clinical examination related automation instruments are very important for the accuracy and the high efficiency of the examination. Disposable pipette tips are used as consumable materials with high use frequency and can be directly contacted with detection samples, so that the detection results are easily influenced, and the consumable materials are important contents to be solved in the automatic process of clinical examination instruments. The traditional disposable pipette tips are various in types and are often divided into multiple specifications of 1000 mu L, 200 mu L, 100 mu L, 50 mu L, 10 mu L and the like, the precision difference between different specifications is large, the large-range pipette tips are low in precision, the small-range pipette tips are high in precision, different pipettes are required to be matched with the pipette tips, the operation is complex, and the pipette tips are not suitable for being used by an automatic inspection instrument. In order to facilitate the operation of the equipment, a plurality of automatic inspection instruments at present often choose to sacrifice pipetting accuracy and choose a sucker with a large range; or the pipette with different measuring ranges is matched with the suction heads with different specifications in the equipment, but the operation flow is increased, so that the operation convenience of the equipment is reduced, and the efficiency of the equipment is affected. Therefore, the pipetting head has the advantages of high accuracy, wide range applicability, simple structure, high efficiency and safety, and wide application prospect, and can meet the pipetting requirements of large volume, medium volume and small volume.

Disclosure of Invention

Aiming at the problems existing in the prior art, the utility model provides a pipetting suction head which has high pipetting accuracy and wide range applicability, can meet pipetting requirements of large volume, medium volume and small volume, and has simple structure, high efficiency and safety.

The utility model provides a liquid-transfering suction head, which comprises a liquid storage area and a liquid-transfering device action area, wherein the liquid storage area at least comprises a first liquid storage partition and a second liquid storage partition which are communicated, the liquid-transfering device action area is communicated with the end of the first liquid storage partition far away from the second liquid storage partition, and the cross-sectional area of a cavity of the first liquid storage partition is larger than that of a cavity of the second liquid storage partition.

Preferably, the cross-sectional area of the cavity of the pipette tip decreases gradually from the pipette application area to the second reservoir area.

Preferably, the outer wall of the action area of the liquid transfer device is provided with a plurality of protruding pieces;

and/or, the pipette tip further comprises a connecting pipe, and the connecting pipe is arranged at the end of the action area of the pipette, which is far away from the first liquid storage area;

and/or, the liquid-transfering suction head further comprises a filter element area, one end of the filter element area is communicated with the action area of the liquid-transfering device, and the other end of the filter element area is communicated with the end of the first liquid storage area far from the second liquid storage area;

and/or, the pipette tip further comprises a transition zone, one end of the transition zone is communicated with the end, close to the second liquid storage zone, of the first liquid storage zone, and the other end of the transition zone is communicated with the end, close to the first liquid storage zone, of the second liquid storage zone;

and/or, the pipetting tip further comprises a suction nozzle, and the suction nozzle is communicated with the second liquid storage partition far from the first liquid storage partition end;

and/or the length L1 of the action area of the liquid dispenser is 5-15mm;

and/or the length L2 of the first liquid storage partition is 10-50mm;

and/or the inclination angle of the first liquid storage partition is alpha, and alpha is more than or equal to 2 degrees and less than or equal to 5 degrees;

and/or the length L3 of the second liquid storage partition is 7-20mm;

and/or the inclination angle of the second liquid storage partition is beta, and beta is more than or equal to 2 degrees and less than or equal to 5 degrees;

preferably, the shape of the protruding member is selected from one or more of straight line, ring shape and curve;

and/or the number of the protruding pieces is 4-24;

and/or the cross-sectional area of the cavity of the connecting pipe gradually becomes larger along the direction away from the action area of the liquid transfer device;

and/or the material of the filter element area is selected from one or more of polyethylene or polypropylene;

and/or the length L4 of the filter element area is 3-8m;

and/or the length L5 of the transition zone is 1.5-4mm;

and/or the inclination angle of the transition zone is gamma which is more than or equal to 30 degrees and less than or equal to 60 degrees.

Preferably, the cross section of the cavity of the pipetting tip is circular.

Preferably, the inner diameter D1 of the action area of the liquid dispenser far from the first liquid storage area is 2-10mm;

and/or, the inner diameter D2 of the action area of the liquid dispenser near the first liquid storage area is 1.48-9.47mm, wherein the sizes of D1 and D1 are in one-to-one correspondence, as follows:

when the inclination angle of the first liquid storage partition is alpha=2°, the inner diameter D1 of the action area of the liquid transfer device far from the first liquid storage partition is 2mm, and the inner diameter D2 of the action area of the liquid transfer device near to the first liquid storage partition is 1.83mm;

when the inclination angle of the first liquid storage partition is alpha=5°, the inner diameter D1 of the action area of the liquid transfer device far from the first liquid storage partition is 2mm, and the inner diameter D2 of the action area of the liquid transfer device near to the first liquid storage partition is 1.48mm;

when the inclination angle of the first liquid storage partition is alpha=2°, the inner diameter D1 of the action area of the liquid transfer device far from the first liquid storage partition is 10mm, and the inner diameter D2 of the action area of the liquid transfer device near to the first liquid storage partition is 9.47mm;

when the inclination angle of the first liquid storage partition is alpha=5°, the inner diameter D1 of the action area of the liquid transfer device far from the first liquid storage partition is 10mm, and the inner diameter D2 of the action area of the liquid transfer device near to the first liquid storage partition is 8.69mm;

and/or the inner diameter D3 of the first liquid storage partition near the action area end of the liquid transfer device is 1.23-8.74mm;

and/or the inner diameter D4 of the first liquid storage partition far away from the action area end of the liquid transfer device is 1.12-7.34mm, such as the corresponding relation between D1 and D2, and the sizes of D3 and D4 are in one-to-one correspondence.

And/or the inner diameter D5 of the second liquid storage partition near the end of the first liquid storage partition is 0.75-3.78mm;

and/or, the inner diameter D6 of the second liquid storage partition far from the end of the first liquid storage partition is 0.38-1.77mm, such as the corresponding relation between D1 and D2, and the sizes of D5 and D6 are in one-to-one correspondence.

Preferably, the number of the protruding members is 12.

Preferably, the suction nozzle is selected from one or more of a flat-mouth type and an open type.

Preferably, when the suction nozzle is of a flat-mouth type, the inner diameter D7 of the suction nozzle is 0.38-1.77mm;

when the suction nozzle is in an opening type, the cross section area of the cavity of the suction nozzle is gradually reduced along the direction away from the first liquid storage partition;

and/or the suction nozzle is provided with a plurality of grooves which penetrate through the inner wall and the outer wall of the suction nozzle.

Preferably, the suction nozzle is one or more selected from a cross shape, a hexagonal opening shape and a rice shape;

and/or, when the suction nozzle is in an opening type, the inner diameter D8 of the suction nozzle near the second liquid storage partition end is 0.32-1.18mm;

and/or, when the suction nozzle is in an opening type, the inner diameter D9 of the suction nozzle far away from the second liquid storage partition end is 0.21-1.05mm.

The utility model has at least one of the following beneficial effects:

1) The utility model breaks through the limitation that the traditional suction head can only be suitable for a single measuring range, can meet the requirement of a small measuring range while having a large measuring range, and is also suitable for automatic pipette equipment.

2) According to the pipette tip, the connecting pipe is arranged in the pipette action area of the pipette tip, so that the pipette tip can be well adapted to automatic pipette equipment;

3) According to the pipette tip, the protruding piece structure is added to the outer wall of the action area of the pipette, so that the intensity of the pipette tip can be effectively enhanced;

4) The liquid-transfering suction head increases the stability of the suction head when combined with a liquid-transfering device;

5) The filter element preassembled in the filter element area of the pipetting head can effectively reduce the pollution risk of potential aerosol of a sample to a pipettor.

6) The pipetting tip can be effectively applied to various automatic pipettor devices, and has great practical significance for promoting the automation of devices in the field of medical appliances.

Drawings

Fig. 1 is a schematic view of a pipette according to the present utility model.

Fig. 2 is a schematic diagram of a pipette according to the present utility model.

Fig. 3 is a schematic view of a pipette according to the third embodiment of the present utility model.

Fig. 4 is a top view of a pipette of the present utility model.

Fig. 5 is a bottom view of a pipette of the present utility model.

Fig. 6 is a partial schematic view of a plain end nozzle of a pipette in accordance with the present utility model.

Fig. 7 is a partial schematic view of a cross-shaped open-mouth type suction nozzle of a pipette according to the present utility model.

Fig. 8 is a partial schematic view of a hexagonal open mouth of a pipette in accordance with the present utility model.

Reference numerals:

1. liquid storage area

11. First liquid storage partition

12. Second liquid storage partition

2. Pipette active area

3. Protrusions

4. Connecting pipe

5. Filter element area

6. Transition zone

7. Suction nozzle

8. Groove(s)

Detailed Description

Other advantages and effects of the present utility model will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present utility model with reference to specific examples. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model.

It should be understood that the process equipment or devices not specifically identified in the examples below are all conventional in the art.

1-5, a pipette tip comprises a liquid storage area 1 and a pipette action area 2, wherein the liquid storage area 1 at least comprises a first liquid storage partition 11 and a second liquid storage partition 12 which are communicated, the pipette action area 2 is communicated with the end of the first liquid storage partition 11 far away from the second liquid storage partition 12, and the cross section area of a cavity of the first liquid storage partition 11 is larger than that of the second liquid storage partition 12. The first liquid storage partition 11 and the second first liquid storage partition 11 can be set to a certain volume according to actual needs. When the automatic pipette head is used, the pipette head with a specific volume is selected according to the requirement, and the action area of the pipette head is contacted and fixed with an automatic pipette, so that the pipette head can be used for pipetting with large volume and medium and small volume.

In a preferred embodiment, the liquid storage area 1 is not limited to the first liquid storage area 11 and the second liquid storage area 12, and may be adjusted according to actual needs, for example, there may be a third liquid storage area, a fourth liquid storage area, and so on.

In a preferred embodiment, the cross-sectional area of the chamber of the pipette tip decreases gradually from the pipette application area 2 to the second reservoir section 12. More preferably, the cross-section of the cavity of the pipette tip is circular.

In a preferred embodiment, the length L1 of the action area 2 of the pipette is 5-15mm, the inner diameter D1 of the action area 2 of the pipette far from the first liquid storage partition 11 is 2-10mm, and the inner diameter D2 of the action area 2 of the pipette near the end of the first liquid storage partition is 1.48-9.47mm; the length L2 of the first liquid storage partition 11 is 10-50mm, the inner diameter D3 of the first liquid storage partition 11 near the action area end of the liquid transfer device is 1.23-8.74mm, the inner diameter D4 of the first liquid storage partition 11 far away from the action area end of the liquid transfer device is 1.12-7.34mm, and the inclination angle of the first liquid storage partition 11 is 2 degrees or more and less than or equal to 5 degrees or less; the length L3 of the second liquid storage partition 12 is 7-20mm, the inner diameter D5 of the second liquid storage partition 12 near the first liquid storage partition end is 0.75-3.78mm, the inner diameter D6 of the second liquid storage partition 12 far from the first liquid storage partition end is 0.38-1.77mm, and the length of the second liquid storage partition 12 is 7-20mm; the inclination angle of the second liquid storage partition 12 is 2 degrees or more and 5 degrees or less. The first liquid storage partition 11 has larger inner diameter and larger pipe wall inclination angle, so that larger volume can be absorbed, and the liquid storage range of the first liquid storage partition 11 can be between 100 and 1000 mu L; the second liquid storage partition 12 has a smaller inner diameter, and the inclination angle of the pipe wall is smaller, so that a tiny volume of liquid can be sucked, and the liquid storage range of the second liquid storage partition 12 can be between 5 and 50 mu L. Therefore, the suction head can achieve both a small range and a large range and has higher accuracy. Taking a pipetting tip with a measuring range of 5-300 mu L as an example, the pipetting accuracy can reach 1 mu L, the precision can reach 1 mu L (% CV: + -5%), 10 mu L (% CV: + -1%), and 100 mu L (% CV: + -0.5%).

In a preferred embodiment, the outer wall of the pipette application area 2 is provided with a plurality of protruding members 3; the shape of the protruding piece 3 is any one of straight line, annular shape and curve, and the number of the protruding pieces 3 is 4-24; more preferably, the number of the protruding members 3 is 12. The protruding member 3 can better increase the strength of the pipette tip, while the structure of the protruding member 3 can also have a better support when the pipette tip is packed into a box,

in a preferred embodiment, the automatic pipette device further comprises a connecting pipe 4, the connecting pipe 4 is arranged at the end of the pipette action area 2 far from the first liquid storage area, the cross-sectional area of the cavity of the connecting pipe 4 along the direction away from the pipette action area 2 gradually becomes larger, and the connecting pipe 4 is convenient for the automatic pipette device to move and take the pipette tip, and meanwhile, the stability of the pipette tip when being combined with the automatic pipette device can be improved due to the protruding piece 3 on the outer wall of the pipette action area 2.

In a preferred embodiment, the filter element area 5 is further included, one end of the filter element area 5 is detachably communicated with the action area 2 of the liquid dispenser, one end of the filter element area 5 is communicated with the action area 2 of the liquid dispenser, the other end of the filter element area 5 is communicated with the end of the first liquid storage area 11 far away from the second liquid storage area, the material of the filter element area 5 is one or more selected from polyethylene or polypropylene, preferably, the filter element area 5 is made of polyethylene, and on the premise of guaranteeing air permeability, the pollution of potential aerosol of a sample can be effectively prevented, the use safety of the liquid transfer suction head is improved, and the length of the filter element area 5 is 3-8m.

In a preferred embodiment, one end of the transition zone 6 is communicated with the end of the first liquid storage partition 11 near the end of the second liquid storage partition, the other end of the transition zone 6 is communicated with the end of the second liquid storage partition 12 near the end of the first liquid storage partition, and the first liquid storage partition 11 is communicated with the second liquid storage partition 12 through the transition zone 6, so that the accuracy is effectively ensured to be unchanged during wide-range liquid pipetting, meanwhile, the problem of liquid leakage caused by overlarge liquid volume is avoided, and the inclination angle of the transition zone 6 is 30 degrees less than or equal to gamma and less than or equal to 60 degrees.

In a preferred embodiment, the device further comprises a suction nozzle 7, wherein the suction nozzle 7 is communicated with the second liquid storage partition 12 far from the end of the first liquid storage partition, and the suction nozzle 7 is one or more selected from a flat mouth type and an open mouth type. When the suction nozzle 7 is of a flat-mouth type, the inner diameter D7 of the suction nozzle 7 is 0.38-1.77mm, and when the suction nozzle 7 is of an open type, the cross-sectional area of the cavity of the suction nozzle 7 gradually decreases along the direction away from the first liquid storage partition 11. Preferably, the suction nozzle 7 is provided with a plurality of grooves 8 penetrating through the inner wall and the outer wall of the suction nozzle 7, and the arrangement of the structure can increase the surface tension of the liquid at the suction nozzle 7 so as to prevent the liquid from dripping and causing pipetting errors.

In a preferred embodiment, the suction nozzle 7 is selected from one or more of a cross-shaped, a hexagonal opening type and a rice-shaped, wherein the flat-mouth type suction nozzle 7 area is suitable for a 300 mu L and below range of pipette tips, the cross-mouth type suction nozzle 7 area and the hexagonal opening type suction nozzle 7 area are suitable for a 500 mu L and above range of pipette tips, and more preferably, a 500 mu L and above range of pipette tips can also be used for a rice-shaped suction nozzle 7 structure. Through the suction nozzle 7 of different structures, the overall accuracy of the suction nozzle can be effectively ensured, and the condition of liquid leakage of the suction nozzle is prevented. When the suction nozzle 7 is opened, the inner diameter D8 of the suction nozzle 7 near the second liquid storage partition end is 0.32-1.18mm; when the suction nozzle 7 is open, the inner diameter D9 of the suction nozzle 7 far from the second liquid storage partition end is 0.21-1.05mm.

Example 1

A disposable pipette tip with a measuring range of 5-300 mu L is manufactured, and the specific structure is as follows:

disposable pipette tip with measuring range of 5-300 mu L

The liquid-transfering suction head of this range includes liquid storage district 1 and liquid-transfering device action district 2, liquid storage district 1 includes first liquid storage subregion 11 and the second liquid storage subregion 12 of intercommunication at least, liquid-transfering device action district 2 with first liquid storage subregion 11 is far away the second liquid storage subregion end communicates, the cavity cross-sectional area of first liquid storage subregion 11 is greater than the cavity cross-sectional area of second liquid storage subregion 12. The cross-sectional area of the chamber of the pipette tip decreases gradually from the pipette application area 2 to the second reservoir section 12. The cross section of the cavity of the pipetting tip is round. The outer wall of the action area 2 of the liquid transfer device is provided with 12 protruding pieces 3, and the shape of each protruding piece 3 is selected from straight lines; the liquid storage device further comprises a connecting pipe 4, wherein the connecting pipe 4 is arranged at the end, far away from the first liquid storage partition, of the action area 2 of the liquid transfer device, and the cross section area of a cavity of the connecting pipe 4 gradually becomes larger along the direction away from the action area 2 of the liquid transfer device; the liquid transfer device further comprises a filter element area 5, wherein one end of the filter element area 5 is communicated with the liquid transfer device action area 2, and the other end of the filter element area 5 is communicated with the end of the first liquid storage area 11 far away from the second liquid storage area; the device further comprises a transition zone 6, wherein one end of the transition zone 6 is communicated with the end, close to the second liquid storage partition, of the first liquid storage partition 11, and the other end of the transition zone 6 is communicated with the end, close to the first liquid storage partition, of the second liquid storage partition 12; the device also comprises a suction nozzle 7, wherein the suction nozzle 7 is communicated with the second liquid storage partition 12 far away from the first liquid storage partition end.

Wherein the length L1 of the action area 2 of the liquid transfer device is 11mm; the inner diameter D1 of the action area 2 of the liquid dispenser far from the first liquid storage partition 11 is 5.99mm, and the inner diameter D2 of the action area 2 of the liquid dispenser near to the first liquid storage partition 11 is 5.31mm; the length L2 of the first liquid storage partition 11 is 24.72mm; the inclination angle of the first liquid storage partition 11 is alpha, wherein alpha=3.63 degrees; the inner diameter D3 of the first liquid storage partition 11 near the action area end of the liquid transfer device is 4.89mm; the inner diameter D4 of the first liquid storage partition 11 far away from the action area end of the liquid transfer device is 3.33mm, and the length L3 of the second liquid storage partition 12 is 13mm; the inclination angle of the second liquid storage partition 12 is 2.64 degrees; the inner diameter D5 of the second liquid storage partition 12 near the end of the first liquid storage partition is 1.4mm; the inner diameter D6 of the second liquid storage partition 12 far from the end of the first liquid storage partition is 0.8mm; the material of the filter element area 5 is one or more selected from polyethylene or polypropylene, and the length L4 of the filter element area 5 is 4mm; the length L5 of the transition zone 6 is 2.68mm, the inclination angle gamma of the transition zone 6 is 43.4 degrees, the suction nozzle 7 is selected from a flat-mouth type, and the inner diameter D7 of the suction nozzle 7 is 0.8mm.

Pipetting tests of three liquid volumes of high, medium and low in the measuring range are respectively carried out on the suction head with the specification of 5-300 mu L in the embodiment, two groups of tests are carried out on each liquid volume, each group of tests is carried out 10 times, the precision of the liquid is calculated according to the test results, and the results are shown in the following tables 1 and 2.

Table 1 5-300. Mu.L range pipette tip precision test results

As shown in Table 1, the pipetting tip of the utility model has the characteristics of high pipetting accuracy and wide range applicability, and can meet pipetting requirements of large volume, medium volume and small volume. The pipetting accuracy of the pipette tip with the measuring range of 5-300 mu L can reach 1 mu L, the pipetting accuracy can reach 1 mu L (% CV: + -5%), 10 mu L (% CV: + -1%), and 100 mu L (% CV: + -0.5%). Therefore, the pipette tip has a good use effect.

The above embodiments are merely illustrative of the principles of the present utility model and its effectiveness, and are not intended to limit the utility model. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model. Accordingly, it is intended that all equivalent modifications and variations of the utility model be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims (10)

1. The utility model provides a pipette tip, its characterized in that includes stock solution district (1) and pipettor action district (2), stock solution district (1) include at least first stock solution subregion (11) and second stock solution subregion (12) of intercommunication, pipettor action district (2) with first stock solution subregion (11) are far away second stock solution subregion end intercommunication, the cavity cross-sectional area of first stock solution subregion (11) is greater than the cavity cross-sectional area of second stock solution subregion (12).

2. A pipette tip according to claim 1, characterized in that the cross-sectional area of the chamber of the pipette tip decreases gradually from the pipette application zone (2) to the second reservoir zone (12).

3. Pipetting tip according to claim 1 or 2, wherein the outer wall of the pipette application zone (2) is provided with a number of protruding elements (3);

and/or, the pipette tip further comprises a connecting pipe (4), and the connecting pipe (4) is arranged at the end of the pipette action area (2) far from the first liquid storage area;

and/or, the liquid-transfering suction head further comprises a filter element area (5), one end of the filter element area (5) is communicated with the liquid-transfering device action area (2), and the other end of the filter element area (5) is communicated with the end of the first liquid storage partition (11) far from the second liquid storage partition;

and/or the pipetting tip further comprises a transition zone (6), one end of the transition zone (6) is in partition with the first liquid storage zone

(11) Near the end of the second liquid storage partition is communicated with the other end of the transition zone (6) and the second liquid storage partition

(12) Near the first liquid storage partition end is communicated;

and/or, the pipetting tip further comprises a suction nozzle (7), and the suction nozzle (7) is communicated with the second liquid storage partition (12) far away from the first liquid storage partition end;

and/or the length L1 of the action area (2) of the liquid transfer device is 5-15mm;

and/or the length L2 of the first liquid storage partition (11) is 10-50mm;

and/or the inclination angle of the first liquid storage partition (11) is alpha, and alpha is more than or equal to 2 degrees and less than or equal to 5 degrees;

and/or the length L3 of the second liquid storage partition (12) is 7-20mm;

and/or the inclination angle of the second liquid storage partition (12) is beta, and beta is more than or equal to 2 degrees and less than or equal to 5 degrees.

4. A pipette tip as claimed in claim 3, characterized in that the shape of the protruding member (3) is selected from one or more of straight line, ring shape and curve;

and/or the number of the protruding pieces (3) is 4-24;

and/or the cross-sectional area of the cavity of the connecting pipe (4) is gradually increased along the direction away from the action area (2) of the liquid transfer device;

and/or the material of the filter element area (5) is selected from one or more of polyethylene or polypropylene;

and/or the length L4 of the filter element area (5) is 3-8m;

and/or the length L5 of the transition zone (6) is 1.5-4mm;

and/or the inclination angle of the transition zone (6) is gamma, and gamma is more than or equal to 30 degrees and less than or equal to 60 degrees.

5. The pipette tip of any one of claims 1, 2 or 4 wherein the chamber cross section of the pipette tip is circular.

6. A pipette tip as claimed in claim 5, characterized in that the inner diameter D1 of the pipette application zone (2) remote from the first reservoir zone (11) is 2-10mm;

and/or the inner diameter D2 of the action area (2) of the liquid transfer device near the end of the first liquid storage area is 1.48-9.47mm;

and/or the inner diameter D3 of the first liquid storage partition (11) near the action area end of the liquid shifter is 1.23-8.74mm;

and/or the inner diameter D4 of the first liquid storage partition (11) far away from the action area end of the liquid shifter is 1.12-7.34mm;

and/or the inner diameter D5 of the second liquid storage partition (12) near the end of the first liquid storage partition is 0.75-3.78mm;

and/or the inner diameter D6 of the second liquid storage partition (12) far away from the end of the first liquid storage partition is 0.38-1.77mm.

7. A pipette tip according to claim 4, characterized in that the number of protruding elements (3) is 12.

8. A pipette tip as claimed in claim 3, characterized in that the suction nozzle (7) is selected from one or more of a flat-mouth type and an open type.

9. A pipette tip as claimed in claim 8, characterized in that when the suction nozzle (7) is flat, the inner diameter D7 of the suction nozzle (7) is 0.38-1.77mm;

and/or, when the suction nozzle (7) is in an opening type, the cross-sectional area of the cavity of the suction nozzle (7) gradually decreases along the direction away from the first liquid storage partition (11);

and/or the suction nozzle (7) is provided with a plurality of grooves (8) penetrating through the inner wall and the outer wall of the suction nozzle (7).

10. The pipette tip according to claim 9, wherein the suction nozzle (7) is selected from one or more of a cross shape, a hexagonal opening shape and a rice shape;

and/or when the suction nozzle (7) is in an opening type, the inner diameter D8 of the suction nozzle (7) near the end of the second liquid storage partition is 0.32-1.18mm;

and/or when the suction nozzle (7) is in an opening type, the inner diameter D9 of the suction nozzle (7) far away from the second liquid storage partition end is 0.21-1.05mm.