CN111992262A

CN111992262A - Disposable quantitative pipette

Info

Publication number: CN111992262A
Application number: CN202010873988.8A
Authority: CN
Inventors: 孙经一; 刘鸣
Original assignee: Shanghai Jingyi Technology Co ltd
Current assignee: Shanghai Jingyi Technology Co ltd
Priority date: 2020-08-26
Filing date: 2020-08-26
Publication date: 2020-11-27

Abstract

The disposable quantitative pipette comprises an air bag and a liquid inlet pipe; the lower end of the air bag is provided with a through hole which is vertically distributed and communicated with the interior of the air bag; the upper end and the lower end of the liquid inlet pipe are of a pointed conical structure; the outer side of the upper end of the liquid inlet pipe is arranged in a through hole at the lower end of the air bag, and the liquid inlet pipe and the air bag are in a sealed state; the upper end of the liquid inlet pipe, which is positioned at the hollow part in the air bag, is higher than the lower end in the air bag; the lower end of the liquid inlet pipe is positioned outside the air bag; the air bag and the liquid inlet pipe are made of transparent materials. In the liquid transfer process, an operator does not need to keep a state of pressing the air bag by hands all the time, the operation of the operator can be facilitated, and because the height of the upper end of the liquid inlet pipe is higher than that of the lower end in the air bag, redundant liquid can not enter the liquid inlet pipe, the experiment bottle and the like, and the aim of accurately transferring the liquid is fulfilled.

Description

Disposable quantitative pipette

Technical Field

The invention relates to the technical field of equipment used in laboratories, in particular to a disposable quantitative pipette.

Background

The pipette is a measuring device for accurately moving and taking a certain volume of solution, and mainly comprises an ear-sucking ball and a long glass tube (the long glass tube is sleeved in a suction hole in the middle of the lower end of the ear-sucking ball) with scale values on the outer side, wherein the scale values are used as marks of the accurate volume of the taken liquid. When the existing pipette is used for transferring liquid, the lower end of the glass tube is inserted into the liquid, then the suction ball is squeezed by hands, the suction ball generates negative pressure suction force to suck the liquid into the glass tube, and the purpose of transferring the liquid is further achieved.

When the prior pipette is used for accurately pipetting (a plurality of physicochemical experiments and the like need accurate liquid amount), two methods are generally adopted. The first is to use a long glass tube with allowance to be sleeved in a suction hole at the lower end of an ear-sucking ball, when the liquid amount sucked in is increased to a scale value required by the front end of the glass tube during pipetting, an operator keeps the strength of pressing the ear-sucking ball by hands, so that the liquid amount is positioned in the glass tube and is at the pipetting amount required by the operator, then the lower end of the glass tube is taken out of the liquid, and the sucked liquid is put into an experimental bottle and the like; according to the operation method, the force of pressing the suction bulb by a hand is not easy to master, the accuracy of the sucked liquid amount cannot be effectively guaranteed, and in the process of transferring the glass tube from the liquid suction to an experiment bottle and the like, the force of pressing the suction bulb by the hand is easy to change, so that the liquid leaks from the lower end of the glass tube and the like, and the influence is brought to the accurate liquid transfer (even if an operator blocks the lower end of the glass tube by the hand after sucking the liquid to prevent the liquid from leaking, when the sucked liquid is corrosive, unnecessary safety risks can be brought to the operator, and the problem that the accuracy of the initial sucked liquid amount cannot be effectively guaranteed in actual operation). The second mode is that the glass tube (that is, the glass tube is filled with liquid and then the required quantitative liquid transfer amount) with a specific scale value is installed at the lower end of the suction bulb for liquid transfer operation, which can ensure that the liquid sucked into the glass tube reaches the required liquid transfer amount, but can not prevent the liquid from entering the suction bulb through the upper end of the glass tube, so that the liquid can not be transferred accurately because the glass tube and the suction bulb are filled with liquid at the same time (when the suction bulb is pressed to discharge the liquid in the glass tube subsequently, the liquid in the suction bulb can be discharged at the same time, thereby causing influence on the accurate liquid transfer), and particularly, when the operation of an inexperienced operator is performed, the problems are more prominent.

Finally, the existing quantitative pipettes all adopt glass and rubber pipette bulb structures, which not only have the defect of high cost, but also easily cause chemical reaction of the moved liquids when the pipettes are used next time if the pipettes are not cleaned up in different liquids during pipetting, thereby causing the physicochemical test to fail to achieve the test effect and even playing a role in reaction.

Disclosure of Invention

In order to overcome the defects that the precise liquid transfer cannot be effectively ensured due to the structural limitation of some liquid transfer pipes, and the liquid transferred next time can not be subjected to chemical reaction easily if the liquid transfer pipes are not cleaned completely, so that the test effect cannot be achieved in a physicochemical test, even the liquid transfer pipes have adverse effects, the invention provides a liquid transfer pipe which adopts transparent polymers such as PET, PP, PE, ABS and the like as manufacturing materials, has low cost and one-time use, prevents the liquid transfer pipe from being subjected to liquid-phase interaction of traditional Chinese medicines for multiple times, so that the test effect cannot be achieved in the physicochemical test, is of an integrated structure, the upper end of the liquid inlet pipe is higher than the inner lower end of the air bag, when an operator performs liquid transfer operation, after the air bag and the liquid inlet pipe are completely filled with liquid, redundant liquid can overflow from the upper end of the liquid inlet pipe to be positioned at the inner lower part of the air bag, so that the precise liquid transfer can be ensured, the operator does not need to press the air bag all the time and does not put the air bag, thereby bringing convenience to the operator and achieving the disposable quantitative pipette which provides powerful technical support for accurate pipetting.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a disposable quantitative pipette is characterized by comprising an air bag and a liquid inlet pipe; the lower end of the air bag is provided with a through hole which is vertically distributed and communicated with the interior of the air bag; the upper end and the lower end of the liquid inlet pipe are of a pointed conical structure; the outer side of the upper end of the liquid inlet pipe is arranged in a through hole at the lower end of the air bag, and the liquid inlet pipe and the air bag are in a sealed state; the upper end of the liquid inlet pipe, which is positioned at the hollow part in the air bag, is higher than the lower end in the air bag; the lower end of the liquid inlet pipe is positioned outside the air bag; the air bag and the liquid inlet pipe are made of transparent materials.

Further, the balloon can take any hollow configuration including spherical.

Furthermore, the air bag and the liquid inlet pipe can be made of any transparent material including PET material, PP, PE and ABS.

Furthermore, an insertion structure can be adopted between the upper end of the liquid inlet pipe and the air bag through hole, and the upper end of the liquid inlet pipe is inserted into the air bag through hole.

Furthermore, the air bag has elasticity, and the liquid inlet pipe has rigidity.

The invention has the beneficial effects that the invention adopts transparent polymers such as PET, PP, PE, ABS and the like as manufacturing materials, has low cost and one-time use, prevents the physical and chemical tests from failing to achieve the test effect caused by the mutual reaction of liquid medicines in multiple pipetting, and has an integrated structure of the liquid inlet pipe and the air bag, simple and compact structure and convenient use. When the liquid inlet pipe is used, the lower end of the liquid inlet pipe is inserted into liquid needing to be moved, then an operator presses the air bag and releases his hands, negative pressure generated by the air bag can enable all liquid in the liquid inlet pipe to be sucked, and redundant liquid can enter the lower end of the air bag from the upper end of the liquid inlet pipe. The invention can bring convenience to the operation of operators because the operators do not need to keep the state of pressing the air bag by hands all the time during the liquid transfer. The operator presses the gasbag after liquid removes the position that needs, then, and whole liquid can flow in the experiment bottle etc. in the feed liquor pipe, because the height of feed liquor pipe upper end is higher than the height of lower extreme in the gasbag, consequently unnecessary liquid can not get into again in feed liquor pipe and the experiment bottle etc. has reached the purpose that the accuracy moved the liquid, has also brought the facility for operator's operation. Based on the above, the invention has good application prospect.

Drawings

The invention is further illustrated below with reference to the figures and examples.

Fig. 1 is a schematic view of the overall structure of the present invention.

Detailed Description

As shown in fig. 1, the disposable quantitative pipette comprises a cylindrical air bag 1 and a liquid inlet pipe 2; the lower end of the middle part of the air bag 1 is provided with a through hole 101 which is vertically distributed and communicated with the interior of the air bag; the upper end and the lower end of the liquid inlet pipe 2 are of a pointed conical structure 21; the front end of the liquid inlet pipe 2 is marked with scale values at intervals from top to bottom; the outer side of the middle part of the upper end of the liquid inlet pipe 2 is arranged in a through hole 101 (which can be bonded) in the middle part of the lower end of the air bag, and the liquid inlet pipe and the air bag are in a sealed state; the liquid inlet pipe 2 is positioned at the upper end of the hollow part in the air bag 1 and is higher than the lower end of the air bag 1 by more than half; the cylindrical air bag 1 and the liquid inlet pipe 2 are made of transparent materials; the air bag 1 has elasticity, and the liquid inlet pipe 2 has certain rigidity (namely certain strength, and can prevent negative pressure from flattening).

As shown in fig. 1, the balloon 1 is not limited to a cylindrical shape, and can adopt any hollow structure including a spherical shape. The air bag 1 and the liquid inlet pipe 2 are made of any transparent material such as PRT, PP, PE, ABS and the like. An insertion structure can be adopted between the upper end of the liquid inlet pipe 2 and the air bag through hole 101, and the upper end of the liquid inlet pipe 2 is inserted into the air bag through hole 101.

As shown in FIG. 1, in practical production, the present invention with different volumes of inlet tubes 2 can be produced, so that users can use the present invention with different volumes of inlet tubes to perform pipetting operations (for example, the volume of the inlet tube 2 is 5 ml, and the volume of the disposable pipette is 5 ml). The invention has simple and compact structure and convenient use. Before use, the invention with the volume of the liquid inlet pipe 2 is selected for pipetting. When moving liquid, the lower end of the liquid inlet pipe 2 is placed into the liquid 3 needing to be moved liquid, then an operator presses the air bag 1 and then loosens the hand, so that the negative pressure generated by the air bag 1 can enable all the liquid 3 in the liquid inlet pipe 2 to be sucked (the hand pressing the air bag 1 is loosened after the air bag 1 is filled with the liquid), and the redundant liquid 3 can enter the lower end of the air bag 1 from a liquid outlet at the upper end part of the liquid inlet pipe 2. The lower end of the liquid inlet pipe 2 is a sharp-cone-shaped thin opening (liquid inlet), which mainly plays a role in liquid transfer, and liquid 3 cannot drip due to overlarge holes at the lower end of the liquid inlet pipe 2. The tapered thin opening (liquid outlet) at the upper end of the liquid inlet pipe 2 absorbs the liquid 3, and when the liquid reaches the pipe orifice at the upper end of the liquid inlet pipe 2, the flow rate is slow, so that the liquid can not directly flow into the air bag 1 in a large amount. The invention can bring convenience to the operation of the operator because the operator does not need to keep the state of pressing the air bag 1 by hands all the time during transferring the liquid 3. After liquid moved the position that needs, the operator pressed gasbag 1 with the hand, so whole liquid can flow in the experiment bottle etc. in the feed liquor pipe 2, because the height of feed liquor pipe 2 upper end is higher than the height of the interior lower extreme of gasbag 1, consequently unnecessary liquid 3 can not get into in the feed liquor pipe 2 again, reached the purpose of accurate liquid removal, also brought the facility for operator's operation. The invention adopts transparent polymers such as PET, PP, PE, ABS and the like as manufacturing materials, has low cost (less than a gross money), is disposable, prevents the physical and chemical tests from failing to achieve the test effect caused by the mutual reaction of liquid medicines in multiple pipetting, has an integrated structure of the liquid inlet pipe 2 and the air bag 1, has simple and compact structure and convenient use, achieves the aim of accurate pipetting and brings convenience to the operation of an operator.

While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Furthermore, it should be understood that although the present description refers to embodiments, the embodiments do not include only one independent technical solution, and such description is only for clarity, and those skilled in the art should take the description as a whole, and the technical solutions in the embodiments may be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A disposable quantitative pipette is characterized by comprising an air bag and a liquid inlet pipe; the lower end of the air bag is provided with a through hole which is vertically distributed and communicated with the interior of the air bag; the upper end and the lower end of the liquid inlet pipe are of a pointed conical structure; the outer side of the upper end of the liquid inlet pipe is arranged in a through hole at the lower end of the air bag, and the liquid inlet pipe and the air bag are in a sealed state; the upper end of the liquid inlet pipe, which is positioned at the hollow part in the air bag, is higher than the lower end in the air bag; the lower end of the liquid inlet pipe is positioned outside the air bag; the air bag and the liquid inlet pipe are made of transparent materials.

2. The disposable quantitative pipette of claim 1 wherein the balloon can take any hollow structure including a sphere.

3. The disposable quantitative pipette as recited in claim 1, wherein the air bag and the liquid inlet tube can be made of any transparent material including PET material, PP, PE, ABS.

4. The disposable quantitative pipette as set forth in claim 1, wherein an insertion structure is further provided between the upper end of the liquid inlet tube inserted into the through hole of the air bag and the through hole of the air bag.

5. The disposable quantitative pipette of claim 1 wherein the balloon is elastic and the inlet tube is rigid.