Pipetting suction tube

Abstract

The utility model discloses a pipetting suction tube, relates to the technical field of suction heads, and aims to solve the technical problem that a filter layer arranged on the inner side of a pipetting suction tube in the prior art is possibly blocked during filtration. The pipe comprises a pipe body, the pipe body comprises a first pipe and a second pipe bent relative to the first pipe, the included angle between the first pipe and the second pipe is 120-150 degrees, the length of the first pipe is 70%-80% of the length of the side wall of the pipe body, the length of the second pipe is 20%-30% of the length of the side wall of the pipe body, a filtering device is arranged on one side of the second pipe, and the filtering device is arranged on the other side of the second pipe. The filtering device is arranged on the side, bent towards the first pipe, of the second pipe, and the filtering device is of a protruding structure. The first pipe, the second pipe, the filtering device and the like are adopted, filtering of the device is directly completed outside the pipe body, blocking is not prone to being caused, the liquid purity can be improved, and the experiment reliability is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of suction head, specifically relates to a pipette. BACKGROUND

[0002] The pipette head is also called pipette tip, pipette head, etc., and is a consumable used in cooperation with a pipette to take out liquid in a medicine bottle or reagent bottle or move the taken-out liquid to another place where the liquid is needed. Most of the current pipette heads are flatly designed. Although the flat design can effectively take out most of the liquid in a liquid storage device such as a test tube or a beaker, the pipette head is flatly designed, and a part of the liquid in the storage device is always left over when the liquid is extracted, which may cause liquid waste. In addition, some liquids are stratified in the storage device, but only a certain layer of liquid is needed for experiments and detection, and some storage devices such as test tubes are relatively narrow. In order to accurately extract the liquid, the pipette head needs to be attached to the wall of the test tube to take the liquid, but the pipette head cannot be completely attached to the wall of the test tube, which affects the extraction of the liquid in the required layer.

[0003] In order to solve the problems of possible liquid residue and possible influence on the extraction of the liquid in the required layer, a bendable pipette head of patent No. CN205965886U is proposed, which comprises a hollow cylindrical head pipe body, a connecting pipe and a curved pipe are provided through the two ends of the head pipe body, the connecting pipe is used for connecting with the liquid suction gun, and the curved pipe forms a bending angle to facilitate the suction of liquid from the storage bottle. The device designs a curved pipette head to solve the above-mentioned problems of difficult extraction of the liquid in the target layer and possible liquid waste, but the bending angle of the device is fixed and cannot be changed according to the shape of the storage device. In the process of pipetting, the operation method still needs to be paid attention to, which is relatively inconvenient.

[0004] At the same time, the device does not set a filtering device, when the liquid contains filamentous impurities such as blood filaments in a blood sample, the sample purity may be affected. In order to solve the filtering problem, the existing patent No. CN217856240U of a pipette head for reducing pollution probability comprises a liquid suction end and a filter layer arranged in the liquid suction end. The filtering structure of the device is arranged in the inner layer of the liquid suction pipe, and the device may be blocked due to too much impurity during filtering, especially filamentous impurities. UTILITY MODEL CONTENTS

[0005] The utility model discloses a pipette, which aims to solve the technical problem of the filter layer arranged in the inner side of the pipette head in the prior art, which may be blocked during filtering.

[0006] To solve the above-mentioned technical problems, the utility model adopts the following technical solutions:

[0007] A pipette comprises a tube body, the tube body comprises a first tube and a second tube bent relative to the first tube, the included angle between the first tube and the second tube is 120-150 degrees, the length of the first tube is 70-80 percent of the length of the side wall of the tube body, the length of the second tube is 20-30 percent of the length of the side wall of the tube body, one side of the second tube is provided with a filter device, the filter device is provided on the side of the second tube bent towards the first tube, and the filter device is a convex structure.

[0008] After the technical scheme is adopted, the first tube and the second tube can be directly bent at a specific fixed angle according to the storage device required for sampling, such as 150 degrees which is suitable for the angle of sampling a wide-mouth bottle. The relatively bent first tube and the second tube can take the sample liquid of a specific layer, and can also reduce the waste of sample liquid and reduce the cost.

[0009] The filter device is provided on the outer side wall of the second tube, and the filter device of the convex structure is provided on the side of the second tube bent towards the first tube. After the suction port of the second tube reaches the target layer, the pressing rod of the pipette is loosened, a suction force is generated from the suction port, liquid enters the tube body from the suction port, at this time, the impurities in the storage device are directly moved towards the second tube under the action of the suction force of the suction port, and are blocked in the recess of the convex structure by the filter device on the second tube. The filtering of the device is directly completed outside the tube body, which is not easy to cause blockage, can also improve the purity of the liquid entering the pipette, and increases the reliability of the experiment.

[0010] The filter device comprises a plurality of filter strips, the length of each filter strip is 50-80 percent of the circumference of the second tube, the height of each filter strip is 0.3-0.8 cm, and the distance between adjacent two filter strips is 0.1-0.5 cm.

[0011] After the technical scheme is adopted, by setting the length of the filter strip in the circumference of the second tube, the height of the filter strip, and the gap between two filter strips, more impurities can be stored in the gap between the filter strips, the blocking effect of the impurities is improved, the purity of the liquid is improved, and the reliability of the experimental results is improved.

[0012] The cross section of the filter strip is a triangle, and the two sides of the triangle away from the second tube form guide surfaces.

[0013] After the technical scheme is adopted, the cross section of the filter strip is set as a triangle, and the two sides of the triangle away from the second tube form guide surfaces. The impurities can enter the convex formed between adjacent two filter strips under the action of the two guide surfaces, and the impurities are stored. Therefore, the setting of the guide surfaces improves the processing speed of the impurities, reduces the influence of the impurities on the liquid, and faster improves the processing speed of the liquid of the required volume.

[0014] The first pipe and the second pipe are connected by the telescopic device, the adjusting device is connected on the pipe body, the adjusting device bends the second pipe relative to the first pipe by adjusting the telescopic device, and the adjusting device comprises a first adjusting rod.

[0015] After the technical scheme is adopted, the first pipe and the second pipe are connected by the telescopic device, the adjusting device is arranged on the pipe body, the relative rotation between the first female rod and the second female rod on the adjusting device is changed, the angle between the first female rod and the second female rod is changed, and then the angle between the first pipe and the second pipe is changed. The pipe body can adapt to the shape structure of the storage device with a fixed bending angle, liquid at the bottom of the storage device is taken out, liquid waste is reduced, liquid at a desired layer can be taken out more accurately, and the accuracy of the experiment is improved.

[0016] The device can adjust the bending angle of the pipette according to the shape of the storage device, can more accurately contact the liquid of the required layer, can take out more liquid while improving the accuracy of taking liquid, and reduces waste. Therefore, the device has better practicability.

[0017] The adjusting device is arranged on the inner wall of the pipe body, the adjusting device further comprises a fixing ring, the fixing ring is connected with the first pipe, and the first female rod is connected with the fixing ring.

[0018] After the technical scheme is adopted, the adjusting device is arranged on the inner wall of the pipe body, the volume of the adjusting device on the inner wall of the pipe body is 4ml, the length of the pipe body is further lengthened, the gap of 4ml is compensated, the overall volume and structure of the pipe body are unchanged from the outside, and the cooperation with the storage device with a smaller size is not affected. The arrangement of the fixing ring in the adjusting device can ensure that the diameter size of the pipe body does not change during adjustment, does not affect the normal flow of liquid in the pipette, and ensures the smoothness during pipetting.

[0019] The second adjusting rod is further connected with the fixing ring, the second adjusting rod comprises a second female rod and a second female rod rotatably connected with the second female rod, and the second adjusting rod is arranged opposite to the first adjusting rod.

[0020] After the technical scheme is adopted, the second adjusting rod is arranged, and the second adjusting rod and the first adjusting rod are arranged opposite to each other. The second adjusting rod is adjusted along with the adjustment of the first adjusting rod, so that the second adjusting rod and the first adjusting rod can form the same bending. After the first adjusting rod and the second adjusting rod are adjusted, the first pipe and the second pipe can be cooperated to support the second pipe, maintain the balance of the opening and the pipe diameter of the second pipe, and be more stable during pipetting. At the same time, the second adjusting rod can better cooperate with the first adjusting rod to ensure the bending angle.

[0021] The first pipe and the second pipe are provided with arc-shaped through grooves matched with telescopic devices, and the telescopic devices are corrugated surfaces arranged in the arc-shaped through grooves.

[0022] By adopting the technical scheme, the arc-shaped through grooves and the corrugated surfaces are arranged, so that the bending degree of the pipe body can be adjusted without changing the length of the pipe body, and the pipe body is better bent, and thus the operation is simple.

[0023] In summary, due to adoption of the technical scheme, the pipette of the utility model has the advantages of:

[0024] (1) The first pipe, the second pipe and the filtering device are adopted, the filtering of the device is directly completed outside the pipe body, the device is not easy to be blocked, the purity of liquid is improved, and the reliability of experiment is improved.

[0025] (2) The first adjusting rod is adopted, the bending angle of the pipette tip can be adjusted according to the shape and size of the storage device, the liquid desired can be better sucked, the accuracy of liquid taking and pipetting is improved, liquid waste is reduced, and the test cost is reduced.

[0026] (3) The cross section of the filtering strip is triangular, the impurities can be guided and accommodated, the impurities are blocked faster, and the working efficiency is improved.

[0027] (4) The fixing ring and the second adjusting rod are adopted, the inner diameter and the opening of the pipette tip can be adjusted with the first adjusting rod, the bending structure is more stable, the bending degree is not changed, and the liquid is better pipetted.

[0028] (5) The arc-shaped through grooves and the corrugated surfaces are adopted, the bending degree of the pipe body can be adjusted without changing the length of the pipe body, the volume of the pipe body is not changed, and the liquid taking and pipetting are more accurate. BRIEF DESCRIPTION OF DRAWINGS

[0029] The utility model will be explained through examples and with reference to the drawings, wherein:

[0030] Figure 1 is a sectional view of the pipette of the utility model;

[0031] Figure 2 is a position structure schematic view of the filtering strip and the fixing groove;

[0032] Figure 3 is a structure schematic view of the pipette of the utility model when being bent.

[0033] REFERENCE NUMERALS

[0034] 1-first tube, 2-fixing ring, 3-second adjusting rod, 301-second female rod, 302-second sub-rod, 4-corrugated surface, 5-first adjusting rod, 501-first sub-rod, 502-first female rod, 6-filter strip, 7-second tube. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. The components of the embodiments of the present application described and indicated in the drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present application.

[0036] In the description of the embodiments of the present application, it should be noted that the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships commonly placed when the utility model product is used, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0037] The embodiments of the present application will be described below in conjunction with Figures 1-3 The utility model will be described in detail.

[0038] Embodiment 1

[0039] A pipette, as shown in Figure 1 and Figure 3 , comprises a tube body, the tube body comprises a first tube 1 and a second tube 7 bent opposite to the first tube 1, the included angle between the first tube 1 and the second tube 7 is 120°-150°, the length of the first tube 1 is 70%-80% of the length of the side wall of the tube body, and the length of the second tube 7 is 20%-30% of the length of the side wall of the tube body, one side of the second tube 7 is provided with a filter device, the filter device is provided on the side of the second tube 7 bent towards the first tube 1, and the filter device is a convex structure.

[0040] In this embodiment, the first tube 1 and the second tube 7 are directly bent to form a fixed angle, preferably 150°, which can be used for sampling in test tubes and wide-mouth bottles. During production, tubes with angles of 150°, 120°, etc., can be directly generated for liquid collection.

[0041] In this embodiment, the tube is made of polypropylene. Polypropylene tubes are not only clean and hygienic, but also have low cost and can be made into disposable consumables, which can reduce costs and pollution.

[0042] In this embodiment, the length of the first tube 1 is 71% of the length of the tube sidewall, and the length of the second tube 7 is 29% of the length of the tube sidewall.

[0043] In this embodiment, the total length of the tube is 4.9cm, the length of the first tube 1 is 3.5cm, and the length of the second tube 7 is 1.4cm.

[0044] In this embodiment, the top of the first tube 1 is provided with a connecting part for connecting to a pipette. When connecting, it is only necessary to insert the pipette tip into the connecting part.

[0045] The first tube 1 and the second tube 7 can be bent at a specific fixed angle according to the sample container needed, such as 150°, which is suitable for sampling from wide-mouth bottles and test tubes. The relatively bent first tube 1 and the second tube 7 can not only obtain a specific layer of sample liquid, but also reduce sample liquid waste and lower costs.

[0046] A filter device is installed on the outer wall of the second tube 7, with the protruding filter device located on the side of the second tube 7 that bends towards the first tube 1. After the pipette tip of the second tube 7 reaches the target layer, releasing the pipette's push rod generates suction from the tip, allowing liquid to enter the tube body. At this time, impurities in the container move directly towards the second tube 7 under the suction force and are blocked by the filter device on the second tube 7 at the recess of the protruding structure. The filtration of this device is completed directly outside the tube body, which is less likely to cause clogging and can also improve the purity of the liquid entering the pipette, increasing the reliability of the experiment.

[0047] In this embodiment, the filtration device includes several filter strips 6, the length of each filter strip 6 is 50%-80% of the circumference of the second tube 7, the height of each filter strip 6 is 0.3-0.8cm, and the distance between two adjacent filter strips 6 is 0.1-0.5cm.

[0048] In this embodiment, the filter strip 6 is also made of polyethylene, and the filter strip 6 is adhered to the second tube 7.

[0049] In this embodiment, the filter strip 6 is provided with 7, the gap between the filter strip 6 is 0.3cm, the filter strip 6 is 1 / 2 second tube 7 arc length, filter strip 6 will second tube 7 is divided into smooth surface and filter surface, smooth surface is used when close to the sample of the storage device wall, improve the accuracy of the contact surface of the pipette.

[0050] In this embodiment, the filter strip 6 height is 0.5cm.

[0051] The length of the filter strip 6 is set to the length of the second tube 7, and the height of the filter strip 6 and the gap between the two filter strips 6, so that more impurities can be stored in the gap between the filter strips 6, and the blocking effect of the impurities is improved, thereby improving the purity of the liquid, so as to achieve the purpose of improving the reliability of the experimental results.

[0052] In this embodiment, as shown in Figure 1 The cross section of the filter strip 6 is triangular, and the two sides of the triangle away from the second tube 7 form a guide surface. In other embodiments, the cross section of the filter strip 6 can be other polygonal structures such as rectangular, pentagonal, etc. When it is rectangular, it is more convenient to process the filter strip 6. When it is other polygonal structure, multiple guide surfaces can be provided for better guidance.

[0053] In this embodiment, the angle between the two guide surfaces is 45°.

[0054] The cross section of the filter strip 6 is triangular, and the two sides of the triangle away from the second tube 7 form a guide surface. In other embodiments, the cross section of the filter strip 6 can be other polygonal structures such as rectangular, pentagonal, etc. When it is rectangular, it is more convenient to process the filter strip 6. When it is other polygonal structure, multiple guide surfaces can be provided for better guidance.

[0055] The specific use method of the utility model is as follows:

[0056] Referring to Figures 1-3 , when the device is used, first, according to the liquid storage device and the layer where the target liquid is located, bend the second tube 7, so that the second tube 7 forms a fixed angle with the first tube 1, such as 150° suitable for wide-mouth bottle and test tube sampling, and directly used when taking liquid. Connect the device with the gun mouth of the pipette, press the pressing rod. Then, the smooth surface of the second tube 7 is close to the wall of the liquid storage device, and when reaching the target layer, release the pressing rod, and the suction force will be generated from the suction port at the end of the second tube 7, and the liquid will enter the tube body from the suction port. At this time, the impurities in the storage device will move towards the second tube 7 under the action of the suction force of the suction port, and be blocked in the recess of the convex structure on the filter device of the second tube 7. The filtering of the device is completed directly outside the tube body, which is not easy to cause blockage, and can also improve the purity of the liquid entering the pipette, and increase the reliability of the experiment.

[0057] Embodiment 2

[0058] This embodiment is basically the same as Embodiment 1, except that in this embodiment, as shown in Figures 1 to 3 the first tube 1 and the second tube 7 are connected by a telescopic device, and an adjusting device is connected to the tube body, the adjusting device bends the second tube 7 relative to the first tube 1 by adjusting the telescopic device, and the adjusting device includes a first adjusting rod 5, the first adjusting rod 5 includes a first female rod 502 and a first male rod 501 connected by rotation.

[0059] In this embodiment, the first female rod 502 and the first male rod 501 are connected by a hinge rod.

[0060] In this embodiment, the first female rod 502 and the second male rod 302 are also made of polypropylene material.

[0061] In this embodiment, the first female rod 502 and the second male rod 302 are both thin rods with a thickness of 0.3mm, which have a certain strength and are thin enough not to affect the transportation of liquid.

[0062] In this embodiment, the first female rod 502 and the first male rod 501 are directly fixed in angle by friction.

[0063] The first tube 1 and the second tube 7 are connected by a telescopic device, and an adjusting device is provided on the tube body, the angle between the first female rod 502 and the second female rod 301 is changed by the relative rotation between the first female rod 502 and the second male rod 302 on the adjusting device, and then the angle between the first tube 1 and the second tube 7 is changed. The tube body can adapt to the shape structure of the storage device with a fixed bending angle, and the liquid at the bottom of the storage device can be taken out, reducing the waste of liquid, and also the liquid at the desired level can be taken more accurately, improving the accuracy of the experiment.

[0064] The device can adjust the bending angle of the pipette according to the shape of the storage device, can contact the liquid more accurately, and can take out more liquid to reduce waste while improving the accuracy of taking liquid. Therefore, the device has better practicality.

[0065] In this embodiment, the adjusting device is arranged on the inner wall of the tube body, and the adjusting device further includes a fixing ring 2, the fixing ring 2 is connected with the first tube 1, and the first female rod 502 is connected with the fixing ring 2.

[0066] In this embodiment, the fixing ring 2 is also made of polypropylene material.

[0067] In this embodiment, the fixing ring 2 is adhered to the tube body, and the adhesion makes the connected two parts relatively flat, without protrusions and the like, and is relatively stable in use.

[0068] In this embodiment, the fixing ring 2 and the first female rod 502 are bonded together as a single unit.

[0069] In this embodiment, the first mother rod 502 is bonded to the first tube 1, and the first daughter rod 501 is bonded to the second tube 7.

[0070] In this embodiment, the fixed ring 2, the first sub-rod 501, the first mother rod 502 and the hinge rod occupy 4 ml of the total volume inside the pipette. During actual pipetting, the length of the tube is extended so that the volume of the extended part is 4 ml, ensuring that the total volume remains unchanged during pipetting.

[0071] In this embodiment, the adjusting device is placed on the inner wall of the tube, and the volume occupied by the adjusting device on the inner wall of the tube is fixed at 4 ml. The length of the tube is then extended to make up for the 4 ml difference, so that the overall volume and structure of the tube remain unchanged from the outside and do not affect its compatibility with smaller containers. The fixing ring 2 in the adjusting device ensures that the diameter of the tube does not change during adjustment, and does not affect the normal flow of liquid in the pipette, thereby ensuring smoothness during pipetting.

[0072] In this embodiment, a second adjusting rod 3 is also connected to the fixed ring 2. The second adjusting rod 3 includes a second mother rod 301 and a second daughter rod 302 rotatably connected to the second mother rod 301. The second adjusting rod 3 is arranged relative to the first adjusting rod 5.

[0073] In this embodiment, the angle between the second adjusting rod 3 and the first adjusting rod 5 is 180°.

[0074] In this embodiment, the second adjusting rod 3 is bonded to the fixing ring 2.

[0075] In this embodiment, the first adjusting rod 5 and the second adjusting rod 3 are of equal length.

[0076] In this embodiment, the first sub-rod 501 is bonded to the second tube 7, and the hinge joint between the first sub-rod 501 and the first mother rod 502 corresponds to the telescopic device.

[0077] In this embodiment, the total length of the first sub-rod 501 and the first mother rod 502 is 3.5cm, the length of the first sub-rod 501 is 2.7cm, and the length of the first mother rod 502 is 0.8cm.

[0078] The second adjusting rod 3 is arranged oppositely to the first adjusting rod 5, and the second adjusting rod 3 is adjusted along with the first adjusting rod 5, so that the second adjusting rod 3 and the first adjusting rod 5 can form the same bending, and after the first adjusting rod 5 and the second adjusting rod 3 are adjusted, the first adjusting rod 5 and the second adjusting rod 3 can cooperate with the first pipe 1 and the second pipe 7 to support the second pipe 7, maintain the balance of the opening and the pipe diameter of the second pipe 7, and be more stable during pipetting. At the same time, the second adjusting rod 3 can better cooperate with the first adjusting rod 5 to ensure the bending angle.

[0079] In the embodiment, the first pipe 1 and the second pipe 7 are provided with arc-shaped through grooves matched with the telescopic device, and the telescopic device is a corrugated surface 4 arranged in the arc-shaped through groove.

[0080] In the embodiment, the corrugated surface 4 is sealed and adhered to the arc-shaped through groove.

[0081] The arrangement of the arc-shaped through groove and the corrugated surface 4 can ensure that the bending degree of the pipe body is adjusted and better bent under the condition that the length of the pipe body is unchanged, so that the operation is simple.

[0082] The specific use method of the embodiment 2 is as follows:

[0083] Referring to Figures 1-3 When the device is used, the bending degree of the pipette is adjusted according to the shape and size of the liquid storage device to be aspirated. Specifically, when it is needed to pipette the liquid in a certain layer of a test tube, the optimal pipetting bending angle is determined to be 155°, a user wearing a sterile glove holds the pipette, one hand holds the first pipe 1, and the other hand holds the second pipe 7, and the second pipe 7 is rotated to make the included angle between the first sub-rod 501 in the second pipe 7 and the first female rod 502 in the first pipe 1 be about 155°. At this time, the corrugated surface 4 close to the first adjusting rod 5 is contracted, the corrugated surface 4 close to the second adjusting rod 3 is stretched, the second adjusting rod 3 is bent along with the bending of the first adjusting rod 5, and the entire second pipe 7 and the corrugated surface 4 are supported. After the bending angle is determined, the operation of connecting the pipette according to the embodiment 1 is performed to aspirate the liquid.

[0084] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pipette characterized by: The utility model provides a filter pipe, which comprises a pipe body, the pipe body comprises a first pipe (1) and a second pipe (7) bent relative to the first pipe (1), the included angle between the first pipe (1) and the second pipe (7) is 120-150 degrees, the length of the first pipe (1) is 70-80% of the length of the side wall of the pipe body, and the length of the second pipe (7) is 20-30% of the length of the side wall of the pipe body, one side of the second pipe (7) is provided with a filter device, the filter device comprises a convex structure arranged on the side of the second pipe (7) bent towards the first pipe (1).

2. A pipette according to claim 1, characterized in that: The filter device comprises a plurality of filter strips (6), the length of each filter strip (6) is 50-80% of the circumference of the second pipe (7), the height of each filter strip (6) is 0.3-0.8 cm, and the distance between two adjacent filter strips (6) is 0.1-0.5 cm.

3. A pipette according to claim 2, wherein: The cross section of the filter strip (6) is triangular, and the two sides of the triangle away from the second pipe (7) form guide surfaces.

4. A pipette according to any one of claims 1 to 3, characterized in that: The first pipe (1) and the second pipe (7) are connected by an extensible device, the pipe body is connected with an adjusting device, the adjusting device bends the second pipe (7) relative to the first pipe (1) by adjusting the extensible device, the adjusting device comprises a first adjusting rod (5), and the first adjusting rod (5) comprises a first female rod (502) and a first male rod (501) rotatably connected.

5. A pipette according to claim 4, characterised in that: The adjusting device is arranged on the inner wall of the pipe body, the adjusting device further comprises a fixing ring (2), the fixing ring (2) is connected with the first pipe (1), and the first female rod (502) is connected with the fixing ring (2).

6. A pipette according to claim 5, characterised in that: The fixing ring (2) is further connected with a second adjusting rod (3), the second adjusting rod (3) comprises a second female rod (301) and a second male rod (302) rotatably connected with the second female rod (301), and the second adjusting rod (3) is arranged relative to the first adjusting rod (5).

7. A pipette according to claim 4, characterized in that: The first pipe (1) and the second pipe (7) are provided with an arc-shaped through groove matched with the extensible device, and the extensible device is a corrugated surface (4) arranged in the arc-shaped through groove.

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