CN212370237U

CN212370237U - Double-tube single-quantitative pipette

Info

Publication number: CN212370237U
Application number: CN202021769026.XU
Authority: CN
Inventors: 马云天
Original assignee: Jiangsu Kehua Medical Instrument Technology Co ltd
Current assignee: Jiangsu Kehua Medical Instrument Technology Co ltd
Priority date: 2020-08-22
Filing date: 2020-08-22
Publication date: 2021-01-19
Anticipated expiration: 2030-08-22

Abstract

The utility model discloses a double-tube single quantitative pipette, which comprises an upper air bag, a vent pipe, a lower air bag and a pipette; the utility model discloses a route mutually noninterfere of liquid is absorb to two gasbags can be done a gasbag and absorb liquid, and another gasbag carries out ration discharge liquid, and the gasbag that the original liquid that inhales of rethread after the discharge liquid extrudes the unnecessary liquid sample of discharge and retrieves and then avoids extravagant, so the utility model discloses both can move the purpose of getting liquid and can realize retrieving unnecessary liquid sample by the ration, because the route of independently ventilating of two gasbags takes place the phenomenon that the transition was absorb when no matter which gasbag absorbs in addition, another gasbag all can be discharged quantitative liquid, can not influence the liquid sample move the liquid operation.

Description

Double-tube single-quantitative pipette

Technical Field

The utility model relates to a double-barrelled single quantitative pipette.

Background

At present, a quantitative pipette is a pipetting tool for sucking a certain amount of liquid and then transferring the liquid to another place, and a conventional quantitative pipette structure is shown in fig. 1, and includes an air bag 91, a liquid storage bag 92, and a quantitative pipette 93, wherein the air bag 91 is connected to an upper end of the liquid storage bag 92, an upper end of the quantitative pipette 93 is inserted from a lower end of the liquid storage bag 92 and extends into the air bag 91 and the liquid storage bag 92, and the peripheral outer side of the quantitative pipette 93 is kept to be hermetically connected with the peripheral inner side of the lower end of the liquid storage bag 92, so that the quantitative pipette with the existing structure is formed, by squeezing the bladder 91 and then releasing, such that liquid is drawn from the dosing pipette 93 to fill the entire dosing pipette 93, excess liquid will overflow the upper end of the dosing pipette 93 into the lower reservoir 92, then the air bag 91 is squeezed again to discharge the liquid in the quantitative pipette 93, thus forming the whole sucking and pipetting process; however, the liquid overflowing the liquid storage bag 92 cannot be discharged by the squeezing air bag 91, so that a part of liquid sample is wasted, and great cost consumption is caused for expensive samples, and in addition, some novice operators have excessive force for squeezing the air bag 91, so that the quantitative pipette 93, the liquid storage bag 92 and the air bag 91 are completely filled with the liquid, and thus, the air pressure is insufficient, so that the pipetting fails; the quantitative pipette structure can derive various deformation structures, for example, chinese patent publication No. CN205126256U, in which a liquid storage bag is communicated with and disposed at one side of the upper end of the quantitative pipette, and the overflow pipe designed to be inclined is used to prevent backflow, so the same drawback exists in this patent, and it is necessary to develop a pipette capable of squeezing, discharging, collecting redundant liquid samples, and preventing a novice operator from having difficulty in controlling squeezing pressure to cause excessive suction.

SUMMERY OF THE UTILITY MODEL

To the weak point of above-mentioned prior art, the utility model provides a problem do: provides a double-tube single-quantitative pipette which can not only quantitatively move liquid, but also squeeze, discharge and collect redundant liquid samples and prevent the defect of excessive suction caused by the difficulty in controlling the squeezing pressure by a novice operator.

In order to solve the above problem, the utility model discloses the technical scheme who takes as follows:

a double-tube single-quantitative pipette comprises an upper air bag, a vent pipe, a lower air bag and a pipette; the upper end of the upper air bag is closed, and the lower end of the upper air bag is provided with an upper opening; the lower air bag is positioned right below the upper air bag; the upper end of the lower air bag is closed, and the lower end of the lower air bag is provided with a lower opening; two air pipes are arranged; the two vent pipes are respectively arranged outside two sides of the lower air bag; the upper ends of the two breather pipes extend and meet to form an upper end extending and meeting part; the upper end extension intersection is positioned right above the lower air bag; the upper ends of the extending and meeting positions of the upper ends of the two vent pipes are communicated with the upper opening at the lower end of the upper air bag; the pipette is arranged right below the two vent pipes and the lower air bag; the lower ends of the two vent pipes extend and meet to form a lower end extending and meeting part; the lower end extension intersection is positioned right below the lower opening of the lower air bag; the upper ends of the lower end extension intersections of the two vent pipes are communicated with the lower opening of the lower air bag, and the lower ends of the lower end extension intersections of the two vent pipes are communicated with the upper end of the pipette.

Furthermore, the upper end face of the pipette is connected to the outer side face of the lower end extending intersection of the two vent pipes.

Further, the two vent pipes are respectively connected to the two sides of the lower air bag through plastic pieces in a curing manner.

Further, the pipette is a glass tube.

Further, the pipette is a plastic tube.

Furthermore, a ventilating and water-tight filter element is arranged at the lower opening of the lower air bag; the upper end and the lower end of the ventilation water-blocking filter element respectively extend into the extension intersection of the inner part and the lower end of the lower air bag.

The beneficial effects of the utility model

The utility model discloses the suction and discharge of liquid are used through the cooperation of upper portion gasbag and lower part gasbag, seal between the lower extreme of upper portion gasbag and the upper end of lower part gasbag, extend the ventilation route of upper portion gasbag to the below of lower part gasbag through the breather pipe of lower extreme both sides, and the pipette intercommunication design is in the below of lower part gasbag and breather pipe, so the route that two gasbags absorb liquid mutually noninterfere, can do a gasbag and absorb liquid, another gasbag carries out the ration discharge liquid, extrude the unnecessary liquid sample of discharge through the gasbag that originally inhales liquid after the discharge liquid and retrieve and then avoid extravagant, so the utility model discloses a can not only move the purpose of getting liquid in a ration but also recoverable unnecessary liquid sample, in addition because the independent ventilation route of two gasbags, no matter which gasbag takes place to absorb the phenomenon of transition when absorbing, the other air bag can discharge the quantitative liquid, and the liquid sample pipetting operation is not influenced.

Drawings

Fig. 1 is a schematic structural diagram of the prior art.

Fig. 2 is a schematic structural diagram of embodiment 1 of the present invention.

Fig. 3 is a schematic structural diagram of embodiment 2 of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Example 1

As shown in fig. 2, a double-tube single quantitative pipette comprises an upper air bag 1, a vent pipe 3, a lower air bag 2 and a pipette 4; the upper end of the upper air bag 1 is closed, and the lower end of the upper air bag 1 is provided with an upper opening 11; the lower air bag 2 is positioned right below the upper air bag 1; the upper end of the lower air bag 2 is closed, and the lower end of the lower air bag 2 is provided with a lower opening 21; two air pipes 3 are arranged; the two vent pipes 3 are respectively arranged outside the two sides of the lower air bag 2; the upper ends of the two air pipes 3 extend and meet to form an upper end extending and meeting part 31; the upper end extension intersection 31 is located directly above the lower air bag 1; the upper ends of the extending and meeting parts 31 of the upper ends of the two vent pipes 3 are communicated with the upper opening 11 at the lower end of the upper air bag 1; the pipette 4 is arranged right below the two vent pipes 3 and the lower air bag 2; the lower ends of the two air pipes 3 extend and meet to form a lower end extending and meeting part 32; the lower end extension intersection 32 is located directly below the lower opening 21 of the lower bag 2; the upper ends of the lower end extension junctions 32 of the two air pipes 3 are communicated with the lower opening 21 of the lower air bag 2, and the lower ends of the lower end extension junctions 32 of the two air pipes 3 are communicated with the upper end of the pipette 4. Further preferably, the upper end surface of the pipette 4 is connected to the outer lower end surface of the lower end extension junction 32 of the two air tubes 3. Further, the two vent pipes 3 are respectively connected to the two sides of the lower air bag 2 through plastic parts in a curing manner. Further, the pipette 4 is a glass tube or a plastic tube. The interior of the pipette is generally a circular cavity structure, and the pipette capacity is determined by its inner diameter and length.

The utility model discloses to upper portion gasbag 1 and lower part gasbag 2 two kinds as follows move liquid method.

The first method comprises the following steps: as shown in fig. 2, a pipetting method of a double-tube single quantitative pipette comprises the following steps: s1, pressing of the lower air bag: firstly, the lower air bag 2 is pressed, then the lower end of the pipette 4 is contacted with the liquid surface to be sucked, the lower air bag 2 is loosened, liquid is sucked from the lower end of the pipette 4 and fills the whole pipette 4, and the liquid is sucked to the lower end extending junction 32 of the two air pipes 3 and the inside of the lower air bag 2; s2, pressing of the upper air bag: pressing the upper air bag 1, extruding and discharging the liquid in the whole pipetting tube 4 and the liquid in the lower half part of the extending intersection 32 of the lower ends of the two vent tubes 3 through the air pressure in the upper air bag 1, and realizing pipetting; s3, discharging and collecting residual liquid: the lower balloon 2 is again squeezed so that the liquid inside the lower balloon 2 and in the upper half of the lower extending intersection 32 of the two vent tubes 3 is drained from the lower end of the pipette 4 and collected.

And the second method comprises the following steps: as shown in fig. 2, a pipetting method of a double-tube single quantitative pipette comprises the following steps: s1, pressing of the upper air bag: firstly, pressing the upper air bag 1, then contacting the lower end of the pipette 4 with the liquid surface to be sucked, loosening the upper air bag 1, sucking liquid from the lower end of the pipette 4 and filling the whole pipette, and sucking the liquid to the lower end extension intersection 32 of the two air pipes 3 and the insides of the two air pipes 3; s2, pressing of the lower air bag: the lower air bag 2 is pressed, and the liquid in the whole pipette 4 and the liquid at the lower end extension intersection 32 of the two air pipes 3 are extruded and discharged through the air pressure in the lower air bag 2, so that the aim of pipetting is fulfilled; s3, discharging and collecting residual liquid: the upper air bag 1 is pressed again so that the liquid in the two air tubes 3 is discharged from the lower end of the pipette 4 and collected.

Example 2

The present embodiment is different from embodiment 1 in that a filter element 8 for ventilation and water non-passage is provided at a lower opening 21 of the lower air bag 2. As shown in fig. 3, the upper and lower ends of the air-permeable and water-impermeable filter element 8 extend into the interior of the lower air bag 2 and the lower end extension intersection 32, so the pipetting method of the present invention can be preferably as follows: firstly, by extruding the lower air bag 2, when the liquid is sucked by the pipette 4, the path of the liquid entering is automatically closed when the liquid reaches the lower side of the air-permeable and water-impermeable filter element 8, the pipette 4 automatically stops sucking the liquid, and then after the upper air bag 1 is extruded, the pipette 4 and the liquid in the lower end extension intersection 32 are all discharged, so that the liquid transfer is realized, the subsequent process of discharging and recovering the residual liquid is not needed, and the use is simpler and more convenient; of course, the upper bag 1 can be pressed preferentially in the second mode of embodiment 1.

The utility model discloses the suction and discharge of liquid are used through the cooperation of upper portion gasbag 1 and lower part gasbag 2 two gasbags, seal between the lower extreme of upper portion gasbag 1 and the upper end of lower part gasbag 2, extend the ventilation route of upper portion gasbag 1 to the below of lower part gasbag 2 through breather pipe 3 of lower extreme both sides, and pipette 4 intercommunication design is in the below of lower part gasbag 2 and breather pipe 3, so the route that two gasbags absorb liquid mutually noninterferes, can do a gasbag and absorb liquid, another gasbag carries out quantitative discharge liquid, after discharging liquid again through original gasbag that absorbs liquid extrude discharge unnecessary liquid sample and retrieve and then avoid extravagant, so the utility model discloses both can remove liquid with the ration and can realize the purpose of retrieving unnecessary liquid sample, in addition because the independent ventilation route of two gasbags, regardless of the phenomenon of transitional suction when sucking by any air bag, the other air bag can discharge quantitative liquid, and the liquid sample pipetting operation cannot be influenced.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A double-tube single-quantitative pipette is characterized by comprising an upper air bag, a vent pipe, a lower air bag and a pipette; the upper end of the upper air bag is closed, and the lower end of the upper air bag is provided with an upper opening; the lower air bag is positioned right below the upper air bag; the upper end of the lower air bag is closed, and the lower end of the lower air bag is provided with a lower opening; two air pipes are arranged; the two vent pipes are respectively arranged outside two sides of the lower air bag; the upper ends of the two breather pipes extend and meet to form an upper end extending and meeting part; the upper end extension intersection is positioned right above the lower air bag; the upper ends of the extending and meeting positions of the upper ends of the two vent pipes are communicated with the upper opening at the lower end of the upper air bag; the pipette is arranged right below the two vent pipes and the lower air bag; the lower ends of the two vent pipes extend and meet to form a lower end extending and meeting part; the lower end extension intersection is positioned right below the lower opening of the lower air bag; the upper ends of the lower end extension intersections of the two vent pipes are communicated with the lower opening of the lower air bag, and the lower ends of the lower end extension intersections of the two vent pipes are communicated with the upper end of the pipette.

2. The dual tube single dosing pipette of claim 1 wherein the upper end face of the pipette is attached to the outer side of the lower end of the two vent tubes where the lower ends extend to meet.

3. The dual tube monodose pipette of claim 1, wherein the two vent tubes are respectively connected to the outside of the lower balloon on both sides by a cured plastic part.

4. The dual tube monodose pipette of claim 1, wherein the pipette is a glass or plastic tube.

5. The dual-tube single dosing pipette of claim 1 wherein a vented non-water permeable filter element is provided at the lower opening of the lower air bladder; the upper end and the lower end of the ventilation water-blocking filter element respectively extend into the extension intersection of the inner part and the lower end of the lower air bag.