Split type Pasteur pipette

Abstract

The utility model relates to the technical field of Pasteur pipettes, and discloses a split type Pasteur pipette which is characterized in that an air bag tube is detachably connected with a pipette, the upper end of the pipette is inserted into a storage groove in the air bag tube, a pressing part for negative pressure pipette suction is formed at the upper part of the storage groove, and an upper port of the pipette is positioned below the pressing part; the bottom of the air bag pipe is integrally communicated with a butt joint pipe which is in a hollow strip shape, a round opening pipeline is arranged in the air bag pipe, an upper port of the air bag pipe is communicated with a storage groove, and the bottom of the air bag pipe is integrally connected with a positioner. The air bag pipe and the liquid suction pipe are designed in a split mode and are easy to disassemble, assemble and combine, flexible combination of different specifications can be carried out according to different liquid suction environments, the configuration number of an existing single specification is improved, and using flexibility is improved. A point locator and a trumpet-shaped opening are arranged corresponding to the split structure, insertion and glue adding fixing operation are convenient, and the using effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of Pasteur pipettes, in particular to a split Pasteur pipette. Background Art

[0002] Pasteur pipettes are widely used in genetics, medicine, epidemic prevention, clinical practice, genetics, biochemistry, petrochemicals, and other fields. They are disposable laboratory consumables. Made of transparent polyethylene, they are suitable for aspirating, transferring, or carrying small amounts of liquids in cell-based experiments, clinical trials, cloning experiments, and other applications.

[0003] Currently, Pasteur pipettes are blow-molded in one piece, with tubes of varying sizes designed for different usage scenarios. Faced with complex and changing work environments, where different aspiration and testing tasks require larger airbags or longer pipettes, single-size Pasteur pipettes offer limited flexibility and need improvement. Furthermore, blow-molded pipettes are difficult to produce with high precision, making them inadequate for precise sampling. Utility Model Content

[0004] The purpose of the present utility model is to provide a split Pasteur pipette, which improves the number of existing single-specification configurations and increases flexibility of use. At the same time, the extruded pipette is more precise, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a split Pasteur pipette, comprising an airbag tube and a pipette, wherein the bottom of the airbag tube is detachably connected to the pipette, the upper end of the pipette is inserted into a storage tank inside the airbag tube, a pressing portion for negative pressure pipetting is formed on the upper part of the storage tank, and the upper end of the pipette is located below the pressing portion; the bottom of the airbag tube is integrally connected to a positioner, the trumpet-shaped opening of the positioner faces downward, the bottom diameter is larger than the diameter of the pipette, and it is docked with the pipette interface.

[0006] As an optional solution of the split Pasteur pipette of the present invention, the bottom of the air bag tube is integrated with a butt joint tube, which is in the shape of a hollow strip with a round-mouth pipe inside. The upper end is connected to the storage tank, and the bottom is connected to the positioner.

[0007] As an optional solution for the split Pasteur pipette of the present invention, the inner diameter of the connecting tube is smaller than the bottom port width of the storage tank, and the inner diameter of the connecting tube is larger than the outer diameter of the pipette and does not exceed 0.1 mm, so that the outer wall of the pipette and the inner wall of the connecting tube are in liquid-proof sealing contact.

[0008] As an optional solution of the split Pasteur pipette of the present invention, there is a gap between the pipette body extending to the storage tank and the inner wall of the tank body, which is used for liquid storage.

[0009] As an optional solution of the split Pasteur pipette of the present invention, the storage tank inside the airbag tube is divided into two sections from top to bottom, and the two sections of the tank are connected by a connecting tube integrated in the middle of the airbag tube.

[0010] As an optional solution of the split Pasteur pipette of the present invention, the outer diameter of the pipette is larger than the inner diameter of the connecting tube.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. This split Pasteur pipette has a split design of an air bag tube and a pipette, which are easy to disassemble and assemble. It can be flexibly combined with different specifications to meet different pipetting environments, improving the number of existing single-specification configurations and increasing flexibility of use.

[0013] 2. The split Pasteur pipette is equipped with a locator corresponding to the split structure and a trumpet-shaped opening for easy insertion, and can be fixed with glue to improve the use effect.

[0014] 3. The split pipette adopts the extrusion process to more accurately control the outer diameter and inner diameter of the tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the main structure of Example 1 of the utility model;

[0016] Figure 2 This is a schematic diagram of the disassembled structure of Example 1 of the present utility model;

[0017] Figure 3 This is a schematic cross-sectional view of the airbag tube in Example 1 of the present utility model;

[0018] Figure 4 This is a schematic diagram of the main structure of the airbag tube in Example 2 of the present utility model.

[0019] In the figure: 1. airbag tube; 101. storage tank; 102. pressing part; 103. connecting tube; 2. suction tube; 3. docking tube; 4. positioner; 401. docking tank; 402. seepage tank. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] Example 1

[0022] See also Figure 1-Figure 3 A split Pasteur pipette, designed for flexible use in various sizes and configurations for different pipetting environments. The split Pasteur pipette comprises a balloon tube 1 and a pipette 2. The balloon tube 1 is detachably connected to the pipette 2 at its bottom. The upper end of the pipette 2 is inserted into a storage tank 101 within the balloon tube 1. A pressing portion 102 for negative pressure pipetting is formed above the storage tank 101. The upper end of the pipette 2 is located below the pressing portion 102.

[0023] During use, the operator selects the appropriate specifications for the balloon tube 1 and pipette 2, assembling the pipette 2 onto the balloon tube 1 to form a complete Pasteur pipette. When holding the pipette, the index finger and thumb press inward on the pressing portion 102, flattening the top of the balloon tube 1 and discharging some of the air in the storage tank 101 through the pipette 2. The bottom of the pipette 2 is then inserted into the container of liquid to be drawn, and the pressing portion 102 is gradually released. The elastic deformation of the material causes negative pressure to be generated, drawing the liquid into the storage tank 101 through the pipette 2, completing the aspiration process.

[0024] Note: Pasteurized straws are typically blow-molded, typically made of PE. The balloon tube 1 exhibits elastic recovery when deformed by extrusion. While widely available, the blow-molding process is difficult to precisely control and exhibits low precision. Extrusion-molded tubes offer higher precision, so this application utilizes both extrusion and blow-molding processes. The detailed processing steps are omitted here.

[0025] In this embodiment 1, in order to facilitate the quick assembly and use of the pipette 2: the bottom of the airbag tube 1 is integrated with a docking tube 3, which is a hollow strip with a round-mouthed pipe inside, and the upper port is connected to the storage tank 101; the inner diameter of the docking tube 3 is smaller than the bottom port width of the storage tank 101, and the inner diameter of the docking tube 3 is larger than the outer diameter of the pipette 2 and does not exceed 0.1mm, so that the outer wall of the pipette 2 and the inner wall of the docking tube 3 are in liquid-proof sealing contact; there is a gap between the pipette 2 extending to the storage tank 101 and the inner wall of the tank for liquid storage.

[0026] That is, the pipette 2 can be directly assembled by inserting it into the butt joint 3. The inner diameter of the butt joint 3 is reasonably preset to ensure that the pipette 2 can be easily inserted, and the gap between the two tubes is small enough to maintain the stability of the insertion under friction. After insertion, it can also seal the liquid and prevent the liquid from flowing out of the gap.

[0027] As a further improvement of the present embodiment 1, in order to accurately complete the assembly work of the pipette 2:

[0028] The bottom of the airbag tube 1 is integrated with a docking tube 3, which is a hollow strip with a round-mouthed pipe inside. The upper end is connected to the storage tank 101, and the bottom is integrated with a positioner 4. The trumpet-shaped opening of the positioner 4 faces downward, and the bottom diameter is larger than the diameter of the pipette 2, and docks with the interface of the pipette 2.

[0029] When the pipette 2 is assembled, it is inserted toward the bell mouth at the bottom of the positioner 4, so that the interface of the pipette 2 is easily inserted and the glue fixing operation is performed, thereby improving the use effect.

[0030] Example 2

[0031] Based on Example 1, please refer to Figure 4 To further improve the accuracy of pipetting:

[0032] In this embodiment 2, the storage tank 101 inside the airbag tube 1 is divided into two sections from top to bottom. The two sections of the tank are connected by a connecting tube 103 integrated into the middle part of the airbag tube 1, and the outer diameter of the suction tube 2 is larger than the inner diameter of the connecting tube 103.

[0033] Specifically, after the upper end of the pipette 2 is inserted into the airbag tube 1, it is confined to the storage groove 101 at the bottom of the airbag tube 1, with the pipette 2's body removed from the pressing portion 102. When a worker squeezes the pressing portion 102, the pipette 2's body is not pressed, thus preventing any impact on the suction and delivery process. Furthermore, the functional areas are clearly defined, and the storage groove 101 is used solely for suction and storage, improving suction accuracy.

[0034] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A split Pasteur pipette, comprising an air bag tube (1) and a pipette (2), characterized in that: The bottom of the airbag tube (1) is detachably connected to the liquid suction tube (2), the upper end of the liquid suction tube (2) is inserted into the storage groove (101) in the airbag tube (1), and a pressing portion (102) for negative pressure liquid suction is formed on the upper part of the storage groove (101), and the upper end of the liquid suction tube (2) is located below the pressing portion (102); the bottom of the airbag tube (1) is integrally connected to the positioner (4), the trumpet-shaped opening of the positioner (4) faces downward, and the bottom diameter is larger than the diameter of the liquid suction tube (2).

2. The split Pasteur pipette according to claim 1, characterized in that: The bottom of the airbag tube (1) is integrally connected to a butt-joint tube (3), which is in the shape of a hollow strip and has a round-end pipe inside. The upper end is connected to the storage tank (101), and the bottom is connected to the positioner (4).

3. The split Pasteur pipette according to claim 2, characterized in that: The inner diameter of the butt joint pipe (3) is smaller than the bottom port width of the storage tank (101), and the inner diameter of the butt joint pipe (3) is larger than the outer diameter of the pipette (2) and does not exceed 0.1 mm, so that the outer wall of the pipette (2) and the inner wall of the butt joint pipe (3) are in liquid-resistant sealing contact.

4. The split Pasteur pipette according to claim 3, characterized in that: The liquid suction pipe (2) extends to the storage tank (101) so that there is a gap between the pipe body and the inner wall of the tank body, which is used for liquid suction and storage.

5. The split Pasteur pipette according to claim 4, characterized in that: The storage tank (101) inside the airbag tube (1) is divided into two sections from top to bottom, and the two sections of the tank are connected via a connecting pipe (103) formed integrally in the middle of the airbag tube (1).

6. The split Pasteur pipette according to claim 5, characterized in that: The outer diameter of the liquid suction tube (2) is larger than the inner diameter of the connecting tube (103).

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