CN217068926U

CN217068926U - Quantitative pipette for micro liquid

Info

Publication number: CN217068926U
Application number: CN202220618911.0U
Authority: CN
Inventors: 孙益乐; 王培培; 虞人一; 洪媚
Original assignee: Shanghai Tellgen Life Science Co ltd
Current assignee: Shanghai Tellgen Life Science Co ltd
Priority date: 2022-03-21
Filing date: 2022-03-21
Publication date: 2022-07-29
Anticipated expiration: 2032-03-21

Abstract

The utility model provides a trace liquid ration pipette, including the elasticity vesicle and capillary, the elasticity vesicle has the cavity, the vertical setting of capillary, the vertical bottom of wearing to establish and connecting the elasticity vesicle in middle part of capillary, the upper end of capillary is arranged in the cavity, the lower extreme of capillary exposes under the elasticity vesicle, during the use, extrude the elasticity vesicle earlier, then put into the liquid that needs the absorption with the lower extreme of capillary, relax the elasticity vesicle, liquid passes through the pressure differential, in being inhaled the capillary, many inspiratory liquid can spill over to the bottom of the cavity of elasticity vesicle from the upper end of capillary, thereby the liquid volume that can move and get is decided by the length and the internal diameter of capillary. The utility model discloses a trace liquid quantitative pipette easy operation, convenient to use, the ration is accurate, can avoid cross contamination, design benefit, the structure is succinct, makes portably, and is with low costs, is suitable for extensive popularization and application.

Description

Quantitative pipette for micro liquid

Technical Field

The utility model relates to a pipette technical field, in particular to quantitative pipette technical field specifically indicates a trace liquid quantitative pipette.

Background

A pipette is a gauge used to accurately remove a volume of solution. The pipette is a slender glass tube, the lower end of the pipette is in a sharp mouth shape, and a marked line is engraved at the neck of the upper end of the pipette and is a mark for obtaining the accurate volume.

When the device is used, the outer side wall of the upper end of the pipette is held by the thumb and the middle finger of the right hand, the index finger is close to the upper opening of the pipette, the pipette is vertically inserted below the liquid level to be imbibed, the ear-sucking ball is held in the palm of the left hand with the tip opening facing downwards, the ear-sucking ball is held tightly, air in the ball is discharged, the tip opening of the ear-sucking ball is inserted into or closely connected with the upper opening of the pipette, the left hand finger is loosened slowly to suck the liquid into the pipette slowly until the position is about 1-2 cm above the scale mark, the ear-sucking ball is removed, the upper opening of the pipette is blocked by the index finger of the right hand (at this time, if the solution falls below the scale mark, the liquid needs to be re-imbibed) quickly, then the right hand finger is loosened slightly to slowly descend the liquid, the sight line should be leveled until the meniscus level of the liquid is tangent to the scale mark, the index finger is pressed tightly immediately to prevent the liquid from flowing out, the liquid level to be imbibed is lifted out, and the tip of the lower end of the pipette is contacted with the inner wall of a container to be lifted, and moving the pipette into a container ready to receive the solution, slightly tilting the container to enable the tip at the lower end of the pipette to abut against the inner wall of the container, and then releasing the index finger of the right hand to enable the solution to freely flow down along the wall until all the liquid flows out.

Therefore, the liquid is moved by the pipette, the operation is complex, care and caution are needed, the quantification is inaccurate, and the liquid quantity is controlled by visually observing the scale marks, so that the manual operation is not good.

The pipette tip is disposable, but the cross contamination of the pipette tip can cause errors in detection results if the pipette tip is used for some infected items, and the pipette tip with a filter head has relatively high cost and calibration problems and can cause inaccurate quantification if the pipette tip with the filter head is used.

Still adopt the plastic dropper to move the liquid, for a hose, upper portion is the vesicle, and the middle part is the standpipe, and the lower part is the back taper pipe, and on the standpipe set up the back taper pipe, the vesicle setting was on the standpipe, three integrated into one piece, set up on the standpipe or do not set up the scale, and there is the operation complicacy equally, needs carefully cautiously, and the ration is inaccurate moreover, controls the liquid volume through the range estimation scale mark, and the problem that the manual work is not good is held.

Therefore, it is desirable to provide a quantitative pipette for a small amount of liquid, which is simple to operate, convenient to use, accurate in quantification, and capable of avoiding cross contamination.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects in the prior art, the utility model discloses a quantitative pipette for micro liquid, which has the advantages of simple operation, convenient use and accurate quantification, can avoid cross contamination and is suitable for large-scale popularization and application.

Another object of the present invention is to provide a liquid transfer pipette, which is ingenious in design, simple in structure, easy to manufacture, low in cost, and suitable for mass popularization and application.

In order to achieve the above object, the utility model provides a trace liquid quantitative pipette, its characteristics are, including the elasticity vesicle and capillary, the elasticity vesicle has the cavity, the vertical setting of capillary, the middle part of capillary is vertical wears to establish and connects the bottom of elasticity vesicle, the upper end of capillary is located in the cavity, the lower extreme of capillary exposes under the elasticity vesicle.

Preferably, the elastic vesicle is a plastic vesicle.

Preferably, the elastic vesicles are transparent vesicles or translucent vesicles.

Preferably, the distance between the upper end of the capillary tube and the top of the hollow cavity is no greater than one third of the height of the hollow cavity.

Preferably, the length of the capillary tube is 10 cm-20 cm.

Preferably, the capillary has a bulge in the middle, which lies under the elastic vesicle.

Preferably, the inner diameter of the capillary tube is 0.5 mm-3 mm.

Preferably, the capillary is a glass capillary or a plastic capillary.

Preferably, the capillary is a transparent capillary or a translucent capillary.

Preferably, the bottom of the elastic vesicle is provided with a vertical through hole, the vertical through hole is communicated with the hollow cavity, and the middle part of the capillary tube vertically penetrates through and is connected with the vertical through hole.

The beneficial effects of the utility model mainly lie in:

1. the utility model discloses a trace liquid quantitative pipette includes elastic vesicle and capillary, elastic vesicle has the cavity, the vertical setting of capillary, the vertical bottom of wearing to establish and connecting elastic vesicle in middle part of capillary, the upper end of capillary is arranged in the cavity, the lower extreme of capillary exposes under elastic vesicle, during the use, extrude elastic vesicle earlier, then put into the liquid that needs to absorb with the lower extreme of capillary, relax elastic vesicle, liquid passes through the pressure differential, by inhaling in the capillary, the upper end that many inhales liquid can follow the capillary spills over to the bottom of the cavity of elastic vesicle, thereby can move the liquid volume of getting and decide by the length and the internal diameter of capillary, therefore, the operation is simple, high durability and convenient use, the ration is accurate, can avoid cross contamination, and is suitable for extensive popularization and application.

2. The utility model discloses a trace liquid quantitative pipette includes elastic vesicle and capillary, elastic vesicle has the cavity, the vertical setting of capillary, the vertical bottom of wearing to establish and connecting elastic vesicle in middle part of capillary, the upper end of capillary is arranged in the cavity, the lower extreme of capillary exposes under elastic vesicle, during the use, extrude elastic vesicle earlier, then put into the liquid that needs to absorb with the lower extreme of capillary, relax elastic vesicle, liquid passes through the pressure differential, by inhaling in the capillary, the upper end that many inhaled liquid can follow the capillary spills over to the bottom of the cavity of elastic vesicle, thereby the liquid volume that can move and get is decided by the length and the internal diameter of capillary, therefore, its design benefit, the structure is succinct, it is simple and convenient to make, and is with low costs, be suitable for extensive popularization and application.

These and other objects, features and advantages of the present invention will be fully apparent from the following detailed description and appended drawings, and may be realized by means of the instrumentalities, devices and combinations particularly pointed out in the specification.

Drawings

Fig. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is a front cross-sectional schematic view of the embodiment shown in FIG. 1.

(symbol description)

1 an elastomeric vesicle; 2, a capillary tube; 3, a hollow cavity; 4 vertical perforation.

Detailed Description

In order to clearly understand the technical contents of the present invention, the following embodiments are specifically illustrated in detail.

In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Referring to fig. 1-2, in an embodiment of the present invention, the micro liquid quantitative pipette includes an elastic vesicle 1 and a capillary tube 2, the elastic vesicle 1 has a hollow cavity 3, the capillary tube 2 is vertically disposed, the middle portion of the capillary tube 2 vertically penetrates and connects with the bottom of the elastic vesicle 1, the upper end of the capillary tube 2 is located in the hollow cavity 3, and the lower end of the capillary tube 2 is exposed under the elastic vesicle 1.

The elastic vesicle 1 may be made of any suitable material, and in an embodiment of the present invention, the elastic vesicle 1 is a plastic vesicle.

The plastic vesicle can be a plastic vesicle of any suitable material, preferably a polypropylene vesicle, a polyethylene vesicle or a polyester vesicle. In a specific embodiment of the present invention, the plastic vesicle is a polypropylene vesicle.

For easy observation, the elastic vesicle 1 is preferably a transparent vesicle or a semitransparent vesicle, as shown in fig. 1, and in an embodiment of the present invention, the elastic vesicle 1 is a transparent vesicle.

The distance between the upper end of the capillary tube 2 and the top of the hollow cavity 3 can be determined according to the requirement, and preferably, the distance between the upper end of the capillary tube 2 and the top of the hollow cavity 3 is not more than one third of the height of the hollow cavity 3. In a specific embodiment of the present invention, the distance between the upper end of the capillary 2 and the top of the hollow cavity 3 is 5 mm.

The utility model discloses the liquid volume that can move and get is decided by the inside volume of capillary 2, consequently can change the liquid volume that can move and get through the inside volume that changes capillary 2, and the inside volume change of capillary 2 can be realized through length, internal diameter and the local shape that changes capillary 2.

The inner diameter of the capillary 2 can be determined as required, preferably, the inner diameter of the capillary 2 is 0.5 mm-3 mm, in a specific embodiment of the present invention, the inner diameter of the capillary 2 is 2 mm.

The length of the capillary 2 can be determined according to the requirement, preferably, the length of the capillary 2 is 10 cm-20 cm, in a specific embodiment of the present invention, the length of the capillary 2 is 15 cm.

The capillary 2 may have any suitable shape, and in another embodiment of the invention, the capillary 2 has a bulge in the middle, which is located under the elastic vesicle 1. Thereby accommodating more liquid through the bulge.

The capillary 2 can be a capillary made of any suitable material, preferably, the capillary 2 is a glass capillary or a plastic capillary, and in an embodiment of the present invention, the capillary 2 is a glass capillary.

For easy observation, the capillary tube 2 is preferably a transparent capillary tube or a semitransparent capillary tube, as shown in fig. 1, and in an embodiment of the present invention, the capillary tube 2 is a transparent capillary tube. The middle part of the capillary 2 vertically penetrates and is connected with the bottom of the elastic vesicle 1, and any suitable structure can be adopted, please refer to fig. 1-2, in a specific embodiment of the utility model, the bottom of the elastic vesicle 1 is provided with vertical through holes 4, the vertical through holes 4 are communicated with the hollow cavity 3, and the middle part of the capillary 2 vertically penetrates and is connected with the vertical through holes 4.

When the elastic vesicle is used, the elastic vesicle 1 is pinched by the thumb, the index finger and the middle finger of the right hand, the elastic vesicle 1 is firstly squeezed, air in the hollow cavity 3 is discharged through the capillary tube 2, then the lower end of the capillary tube 2 is placed in liquid to be sucked, the elastic vesicle 1 is loosened, the liquid is sucked into the capillary tube 2 through pressure difference, the liquid which is sucked more overflows to the bottom of the hollow cavity 3 of the elastic vesicle 1 from the upper end of the capillary tube 2, then the lower end of the capillary tube 2 is moved out of the liquid and is transferred into a container which needs to transfer the liquid, and then the elastic vesicle 1 is squeezed until the liquid in the capillary tube 2 is completely emptied, so that the volume of the liquid transferred into a new container is completely determined by the internal volume of the capillary tube 2, and the volume of the liquid transferred into the new container is the internal volume of the capillary tube 2.

Therefore, adopt the utility model discloses, inside through inserting the capillary elastic vesicle, the volume of the liquid that can accurate control capillary absorption, avoid when shifting, the unnecessary liquid that will inhale and get is arranged into new container, and easy operation, high durability and convenient use, only need the extrusion relax the elastic vesicle, ensure that the upper end of capillary can be overflowed to the liquid of absorption, need not to operate as hard as conventional pipette, need loosen the right hand forefinger slightly promptly, make liquid slowly descend, the sight should look level scale mark this moment, it is tangent with the scale mark until the meniscus of liquid, press the forefinger immediately, make liquid no longer flow out. Simultaneously, the capillary tube has better uniformity and can ensure the accuracy of liquid transfer compared with other integrally formed liquid transfer tubes. The utility model discloses can be for once only can throw, with low costs, it is anti-pollution, need not the pipetting gun (also do not have pipetting gun cross contamination, calibration scheduling problem), come the ration according to the capillary, it is accurate, reduce the manual operation difference (than conventional pipette and plastics burette).

To sum up, the utility model discloses a trace liquid ration pipette easy operation, convenient to use, the ration is accurate, can avoid cross contamination, design benefit, the structure is succinct, makes portably, and is with low costs, is suitable for extensive popularization and application.

Therefore, the purpose of the utility model is completely and effectively realized. The functional and structural principles of the present invention have been shown and described in the embodiments, and the embodiments may be modified without departing from the principles. Therefore, the present invention includes all modifications within the spirit and scope of the appended claims.

Claims

1. The utility model provides a trace liquid quantitative pipette which characterized in that, includes the elasticity vesicle and capillary, the elasticity vesicle has the cavity, the capillary is vertical to be set up, the middle part of capillary is vertical to be worn to establish and is connected the bottom of elasticity vesicle, the upper end of capillary is located in the cavity, the lower extreme of capillary exposes under the elasticity vesicle.

2. The micropipette of claim 1, wherein said elastomeric vesicle is a plastic vesicle.

3. The micropipette of claim 1, wherein said elastic vesicle is a transparent vesicle or a translucent vesicle.

4. The micropipette of claim 1, wherein the distance between the upper end of said capillary tube and the top of said hollow cavity is no greater than one third of the height of said hollow cavity.

5. The micropipette of claim 1, wherein the capillary tube has an inner diameter of 0.5mm to 3 mm.

6. The micropipette of claim 1, wherein the capillary tube has a length of 10cm to 20 cm.

7. The micropipette of claim 1, wherein said capillary tube has a bulge in a middle portion thereof, said bulge underlying said elastic vesicle.

8. The micropipette of claim 1, wherein the capillary tube is a glass capillary tube or a plastic capillary tube.

9. The micropipette of claim 1, wherein the capillary tube is a transparent capillary tube or a translucent capillary tube.

10. The pipette of claim 1, wherein the bottom of the elastic vesicle is provided with a vertical perforation, the vertical perforation is communicated with the hollow cavity, and the middle part of the capillary tube vertically penetrates through and is connected with the vertical perforation.