CN212309625U

CN212309625U - Multi-range quantitative pipette

Info

Publication number: CN212309625U
Application number: CN202021769019.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: 2021-01-08
Anticipated expiration: 2030-08-22

Abstract

The utility model discloses a multi-range quantitative pipette, which comprises a top air bag, a vent pipe, at least one lower air bag, a pipette and at least one horizontal connecting pipe; the top air bag and the lower air bag are provided with independent paths which do not interfere with each other and are communicated with a pipette, so that liquid is sucked in through the top air bag, each lower air bag discharges liquid to achieve the aim of quantitative liquid transfer, and redundant liquid samples are discharged through extrusion of the top air bag to achieve recovery and avoid waste; because the top air bag and the lower air bag are provided with independent paths which do not interfere with each other and are used for ventilating with the pipette, even if the top air bag is excessively extruded and filled with the whole liquid, the quantitative liquid drainage of each lower air bag is not influenced; the utility model discloses when top-down connects a plurality of lower part gasbags in proper order in the below of top gasbag, the utility model discloses just possessed the selection of a plurality of ranges, used more nimble changeable.

Description

Multi-range quantitative pipette

Technical Field

The utility model relates to a multirange 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 structure of the quantitative pipette can derive various deformation structures, for example, chinese patent with publication number CN205126256U, which is to arrange a liquid storage bag in communication with one side of the upper end of the quantitative pipette and prevent backflow through an overflow pipe designed in an inclined manner, so the same drawback exists in the patent, and it is necessary to develop a pipette capable of squeezing, discharging, collecting redundant liquid samples and preventing excessive suction caused by poor control of squeezing pressure by a novice operator; in addition, current quantitative pipette only possesses a range, causes the function comparison singleness, the utility model discloses need develop the quantitative pipette of multirange.

SUMMERY OF THE UTILITY MODEL

To the weak point of above-mentioned prior art, the utility model provides a problem do: the multi-range quantitative pipette can not only quantitatively pipette, but also squeeze, discharge and collect redundant liquid samples, prevent the defect of excessive suction caused by poor control of squeezing pressure by a novice operator, and has multiple ranges.

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

a multi-range quantitative pipette comprises a top air bag, a vent pipe, at least one lower air bag, a pipette and at least one horizontal connecting pipe; the upper end of the top air bag is closed, and one side of the lower end of the top air bag is provided with a top opening; the lower part of the top air bag is sequentially connected with at least one lower air bag from top to bottom; the upper end of the lower air bag is closed, and one side of the bottom of the lower air bag is provided with a lower opening; a horizontal connecting pipe is horizontally arranged at the lower opening on one side of the bottom of the lower air bag; the pipettes are arranged on the same side of the top air bag and the lower air bag and are distributed in the vertical direction; the upper end of the vent pipe is connected with the top opening on one side of the lower end of the top air bag, and the lower end of the vent pipe is connected with the upper end of the pipette; one end of the horizontal connecting pipe is connected to the lower opening at one side of the bottom of the lower air bag, and the other end of the horizontal connecting pipe is communicated and connected to the side part of the pipette; the horizontal connecting pipe and the pipette are vertically distributed.

Further, the pipette is a glass tube or a plastic tube.

Further, two lower air bags are connected below the top air bag from top to bottom in sequence; the two lower airbags comprise a first lower airbag and a second lower airbag; the first lower air bag is positioned above the second lower air bag; the first lower air bag and the second lower air bag are respectively communicated and connected with the side part of the pipette through horizontal connecting pipes.

The beneficial effects of the utility model

The utility model discloses a lower extreme of top gasbag and the upper end of lower part gasbag have sealed, the top gasbag directly ventilates with the upper end of pipette through the breather pipe, the lower part gasbag ventilates through the lateral part of horizontal joint pipe with the pipette, so top gasbag and lower part gasbag all have independent, the route of mutually noninterference ventilates with the pipette, like this inhale liquid through the top gasbag, each lower part gasbag drains liquid and realizes the ration and move the liquid purpose, unnecessary liquid sample realization recovery through the extrusion of top gasbag is avoided extravagant; because the top air bag and the lower air bag are provided with independent paths which do not interfere with each other and are used for ventilating with the pipette, even if the top air bag is excessively extruded and filled with the whole liquid, the quantitative liquid drainage of each lower air bag is not influenced; the utility model discloses when top-down connects a plurality of lower part gasbags in proper order in the below of top gasbag, the utility model discloses just possessed the selection of a plurality of ranges, used more nimble changeable.

Drawings

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

Fig. 2 is a schematic view of the present invention with a lower air bag.

Fig. 3 is a schematic structural view of the present invention with two lower airbags.

Fig. 4 is a schematic structural view of the present invention with three lower airbags.

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 multi-range quantitative pipette comprises a top air bag 1, a vent pipe 3, at least one lower air bag 2, a pipette 4, at least one horizontal connecting pipe 5; the upper end of the top airbag 1 is closed, and a top opening 11 is formed in one side of the lower end of the top airbag 1; the lower part of the top airbag 1 is sequentially connected with at least one lower airbag 2 from top to bottom; the upper end of the lower air bag 2 is closed, and one side of the bottom of the lower air bag 2 is provided with a lower opening 21; a horizontal connecting pipe 5 is horizontally arranged at a lower opening 21 at one side of the bottom of the lower air bag 2; the pipettes 4 are arranged on the same side of the top air bag 1 and the lower air bag 2 and are distributed in the vertical direction; the upper end of the vent pipe 3 is connected with the top opening 11 at one side of the lower end of the top airbag 1, and the lower end of the vent pipe 3 is connected with the upper end of the pipette 4; one end of the horizontal connecting pipe 5 is connected to the lower opening 21 at one side of the bottom of the lower air bag 2, and the other end of the horizontal connecting pipe 5 is communicated and connected to the side part of the pipette 4; the horizontal connecting tube 5 and the pipette 4 are distributed vertically to each other. Further, the pipette 4 is a glass or plastic tube, the inside of the pipette 4 is a generally circular cavity structure, and the pipette capacity is determined by the inner diameter and length thereof. At least one scale mark is arranged on the pipette 4; the scale marks are horizontally aligned with the upper end surface of the inner cavity of the horizontal connecting pipe 5. And the top air bag 1, the lower air bag 2, the vent pipe 3 and one side above the pipette 4 are connected through a plastic piece 6 in a curing manner. In the present embodiment, a lower airbag 2 is optionally connected below the top airbag 1. In this way, when pipetting, the embodiment can have two modes, wherein the first mode is that the top air bag 1 is directly extruded to aspirate liquid, then the lower air bag 2 is extruded to quantitatively pipette liquid, and finally the top air bag 1 is extruded again to discharge the residual liquid for recovery; the second is directly extruding the lower air bag 2 to suck liquid, then quantitatively transferring liquid by extruding the top air bag 1, and finally extruding the lower air bag 2 again to discharge residual liquid for recovery.

Example 2

As shown in fig. 3, this embodiment is different from embodiment 1 in the number of lower air bags 2 and the pipetting method, and two lower air bags 2 are connected to the lower part of the top air bag 1 from top to bottom; the two lower airbags 2 include a first lower airbag 2a and a second lower airbag 2 b; the first lower bag 2a is positioned above the second lower bag 2 b; the first lower air cell 2a and the second lower air cell 2b are connected to the side of the pipette 4 via a horizontal connection tube 5.

A pipetting method of a multi-range quantitative pipette comprises the following steps:

s1, pressing of the top airbag: the top air bag 1 is first pressed and then the lower end of the pipette 4 is brought into contact with the liquid surface to be sucked, the top air bag 1 is released, liquid is sucked from the lower end of the pipette 4 and fills the entire pipette 4, and liquid is sucked into the vent tube 3 and even into the top air bag 1.

S2, quantitative pressing air bag: the first lower air bag 2a and/or the second lower air bag 2b are pressed to realize the purpose of quantitative liquid transfer; the step has three modes for quantitative pipetting, and can be selected according to actual requirements. Firstly, the first lower air bag 2a is pressed, so that the liquid in the pipette 4 below the horizontal connecting pipe 5 connected with the first lower air bag 2a is completely discharged, and quantitative liquid transfer with the maximum range is realized; secondly, the second lower air bag 2b is pressed, so that the liquid in the pipette 4 below the horizontal connecting pipe 5 connected with the second lower air bag 2b is completely discharged, and quantitative liquid transfer is realized; thirdly, the second lower air bag 2b is firstly pressed, so that the liquid in the pipette below the horizontal connecting pipe 5 connected with the second lower air bag 2b is completely discharged, and quantitative liquid transfer of one measuring range is realized; then, the first lower air bag 2a is pressed, so that the liquid in the pipette 4 between the horizontal connecting tubes 5 connected with the first lower air bag 2a and the second lower air bag 2b is completely discharged, and quantitative pipetting of another range is realized.

S3, discharging and collecting residual liquid: the top balloon 1 is squeezed again so that the remaining liquid in the vent tube 3 and the pipette 4 is expelled and collected.

Referring to embodiment 2, three lower airbags 2, four lower airbags 2, five lower airbags 2, and so on are connected in sequence from top to bottom below the top airbag 1, as shown in fig. 4, thus having more range.

The utility model discloses a lower extreme of top gasbag 1 and the upper end of lower part gasbag 2 have sealed, top gasbag 1 directly ventilates with the upper end of pipette 4 through breather pipe 3, lower part gasbag 2 ventilates through the lateral part of horizontal connecting pipe 5 with pipette 4, so top gasbag 1 and lower part gasbag 2 all have independent, the route that does not interfere with each other ventilate with the pipette, so inhale liquid through top gasbag 1, each lower part gasbag 2 drains liquid and realizes the ration and move the liquid purpose, unnecessary liquid sample realization recovery through the extrusion of top gasbag 1 avoids extravagant; because the top air bag 1 and the lower air bag 2 are provided with independent paths which do not interfere with each other and are used for ventilating with the pipette, even if the top air bag 1 is excessively extruded and filled with the whole liquid, the quantitative liquid drainage of each lower air bag 2 is not influenced; the utility model discloses when top-down connects a plurality of lower part gasbags 2 in proper order in top gasbag 1's below, the utility model discloses just possessed the selection of a plurality of ranges, used more nimble changeable.

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 multi-range quantitative pipette is characterized by comprising a top air bag, a vent pipe, at least one lower air bag, a pipette and at least one horizontal connecting pipe; the upper end of the top air bag is closed, and one side of the lower end of the top air bag is provided with a top opening; the lower part of the top air bag is sequentially connected with at least one lower air bag from top to bottom; the upper end of the lower air bag is closed, and one side of the bottom of the lower air bag is provided with a lower opening; a horizontal connecting pipe is horizontally arranged at the lower opening on one side of the bottom of the lower air bag; the pipettes are arranged on the same side of the top air bag and the lower air bag and are distributed in the vertical direction; the upper end of the vent pipe is connected with the top opening on one side of the lower end of the top air bag, and the lower end of the vent pipe is connected with the upper end of the pipette; one end of the horizontal connecting pipe is connected to the lower opening at one side of the bottom of the lower air bag, and the other end of the horizontal connecting pipe is communicated and connected to the side part of the pipette; the horizontal connecting pipe and the pipette are vertically distributed.

2. The multi-range dosing pipette of claim 1, wherein the pipette is a glass or plastic tube.

3. The multi-range quantitative pipette according to claim 1, wherein two lower air bags are connected below the top air bag from top to bottom in sequence; the two lower airbags comprise a first lower airbag and a second lower airbag; the first lower air bag is positioned above the second lower air bag; the first lower air bag and the second lower air bag are respectively communicated and connected with the side part of the pipette through horizontal connecting pipes.