阅读说明：本技术 一种微流控芯片 (Micro-fluidic chip ) 是由 魏清泉 于 2020-05-08 设计创作，主要内容包括：本发明提供一种微流控芯片,属于微流控技术领域,包括芯片基体,在所述芯片基体上设置有样品池、液体输出口和连通所述样品池和所述液体输出口的输液管道,所述样品池具有开口用于注入液体样本；所述输液管道上连通设置有功能池,所述液体输出口外接负压装置以在所述液体输出口形成负压。液体样本从样品池到液体输出口的转移,实现了液体样本在微流控芯片上的转移操作,以方便进行后续试验。(The invention provides a micro-fluidic chip, which belongs to the technical field of micro-fluidic and comprises a chip substrate, wherein a sample pool, a liquid output port and a liquid conveying pipeline for communicating the sample pool and the liquid output port are arranged on the chip substrate, and the sample pool is provided with an opening for injecting a liquid sample; the infusion pipeline is communicated with a functional pool, and the liquid outlet is externally connected with a negative pressure device so as to form negative pressure at the liquid outlet. The liquid sample is transferred from the sample pool to the liquid output port, so that the transfer operation of the liquid sample on the microfluidic chip is realized, and the subsequent test is convenient to carry out.)

1. A microfluidic chip is characterized by comprising a chip substrate, wherein a sample pool, a liquid output port and a liquid conveying pipeline for communicating the sample pool and the liquid output port are arranged on the chip substrate, and the sample pool is provided with an opening for injecting a liquid sample; the infusion pipeline is communicated with a functional pool, and the liquid outlet is externally connected with a negative pressure device so as to form negative pressure at the liquid outlet.

2. The microfluidic chip according to claim 1, wherein the functional cell comprises a metering cell, the metering cell is further connected with a first pumping pipeline, and the other end of the first pumping pipeline is used for connecting negative pressure.

3. The microfluidic chip according to claim 2, wherein the functional cell further comprises a transfer cell and a reagent cell, the reagent cell and the transfer cell are sequentially communicated with each other along a liquid output direction and are disposed at an output end of the metering cell, the liquid output port is communicated with the transfer cell, and a reagent is pre-buried in the reagent cell.

4. The microfluidic chip according to claim 3, wherein the transfer pool is further connected to a second pumping channel, and the second pumping channel is used for connecting a negative pressure.

5. The microfluidic chip according to claim 2, wherein the functional pool further comprises a buffer pool, the buffer pool is communicated with the metering pool, and the buffer pool is provided with an opening for communicating with the outside.

6. The microfluidic chip according to claim 2, wherein a waste liquid pool is disposed on the chip substrate, the waste liquid pool is respectively communicated with the sample pool and the measuring pool, and an opening is disposed on the waste liquid pool for communicating with the outside.

7. The microfluidic chip according to claim 1, wherein the fluid delivery tube has a plurality of valves, and the valves are respectively connected between adjacent functional cells.

8. The microfluidic chip according to claim 1, wherein the inner diameter of the infusion tube is between 0.01mm and 2 mm.

9. The microfluidic chip according to any one of claims 1 to 8, wherein the infusion tube, the functional reservoir and the liquid outlet form a single-channel liquid transfer channel, the number of the liquid transfer channels on the chip substrate is plural, and the plural infusion transfer channels are respectively communicated with the sample reservoir.

10. The microfluidic chip according to claim 9, wherein the liquid transfer channels are arranged in the same direction on the chip substrate.

Technical Field

The invention relates to the technical field of microfluidics, in particular to a microfluidic chip.

Background

The micro-fluidic analysis chip constructs each micro-functional component on the chip through a micro-machining technology, thereby forming an analysis system with micro-channel control. The micro-fluidic chip has wide application prospect in various fields. Among them, biomedicine is the main application field of the current microfluidic chip, and for example, the microfluidic chip for clinical examination has the most extensive market in China.

However, because the chip has a small volume and a complex structure, the transfer operation of some liquid samples is easy to make mistakes or cannot be realized, thereby causing the failure of the subsequent detection test of the liquid samples.

Disclosure of Invention

The invention aims to provide a microfluidic chip which can accurately realize the transfer operation of a liquid sample on a chip substrate.

The embodiment of the invention is realized by the following steps:

one aspect of the embodiments of the present invention provides a microfluidic chip, which includes a chip substrate, wherein a sample cell, a liquid outlet, and a liquid delivery pipe communicating the sample cell and the liquid outlet are disposed on the chip substrate, and the sample cell has an opening for injecting a liquid sample; the infusion pipeline is communicated with a functional pool, and the liquid outlet is externally connected with a negative pressure device so as to form negative pressure at the liquid outlet.

Optionally, the functional pool comprises a metering pool, the metering pool is further communicated with a first air exhaust pipeline, and the other end of the first air exhaust pipeline is used for connecting negative pressure.

Optionally, the functional pool further comprises a transfer pool and a reagent pool, the reagent pool and the transfer pool are sequentially communicated and arranged at the output end of the metering pool along the liquid output direction, the liquid output port is communicated with the transfer pool, and a reagent is pre-embedded in the reagent pool.

Optionally, the transfer pool is further communicated with a second air exhaust pipeline, and the second air exhaust pipeline is used for connecting negative pressure.

Optionally, the function pool further comprises a buffer pool, the buffer pool is communicated with the metering pool, the buffer pool is provided with an opening, and the opening is used for being communicated with the outside.

Optionally, a waste liquid pool is arranged on the chip substrate, the waste liquid pool is respectively communicated with the sample pool and the metering pool, and an opening is formed in the waste liquid pool and used for being communicated with the outside.

Optionally, a plurality of valves are arranged on the infusion pipeline, and the valves are respectively connected between the adjacent functional pools.

Optionally, the inner diameter of the infusion tube is between 0.01mm and 2 mm.

Optionally, the infusion tube, the functional pool and the liquid outlet form a single-channel liquid transfer channel, the number of the liquid transfer channels on the chip substrate is multiple, and the multiple infusion transfer channels are respectively communicated with the sample pool.

Optionally, the arrangement directions of the liquid transfer channels on the chip substrate are the same.

The embodiment of the invention has the beneficial effects that:

the microfluidic chip provided by the embodiment of the invention comprises a chip substrate, wherein a sample cell is arranged on the chip substrate, and the sample cell is provided with an opening for injecting a liquid sample; still be equipped with liquid delivery outlet and the infusion pipeline of intercommunication sample cell and liquid delivery outlet on the chip base member, the last intercommunication of infusion pipeline is provided with the function pond, the liquid sample pours into the sample cell into through the opening into, flow into the function pond through the infusion pipeline again, accomplish specific processing to the liquid sample in the function pond, the liquid sample after the processing flows out from the liquid delivery outlet through the infusion pipeline again, the external negative pressure device of liquid delivery outlet is in order to form the negative pressure at the liquid delivery outlet, the negative pressure is less than the ordinary pressure, the fluid has the characteristic that high pressure flows to the low pressure, the liquid sample of negative pressure guide flows to the liquid delivery outlet from the sample cell, in order to carry out follow-up processing such. The liquid sample is transferred from the sample pool to the liquid output port, so that the transfer operation of the liquid sample on the microfluidic chip is realized, and the subsequent test is convenient to carry out.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a microfluidic chip according to an embodiment of the present invention;

fig. 2 is a second schematic structural diagram of a microfluidic chip according to an embodiment of the present invention.

Icon: 2-chip substrate; 21-a sample cell; 22-waste liquid pool; 231. 232, 233, 234-metering pool; 241. 242, 243, 244-cache pool; 221. 2411, 2421, 2431, 2441-opening; 251. 252, 253, 254-reagent reservoir; 261. 262, 263, 264-transfer cell; 210. 211, 2101, 2102, 2103, 2104, 21011, 21012, 21013, 21014, 21021, 21022, 21023, 21024, 21031, 21032, 21033, 21034, 21041, 21042, 21043, 21044, 21051, 21052, 21053, 21054, 21061, 21062, 21063, 21064-branch tubing; 21081. 21082, 21083, 21084-a first extraction duct; 21071. 21072, 21073, 21074-a second extraction duct; 2811. 2821, 2822, 2823, 2824, 2831, 2832, 2833, 2834, 2841, 2842, 2843, 2844, 2851, 2852, 2853 and 2854-minute valves; 271. 272, 273, 274-negative pressure port; 291. 292, 293, 294-liquid output.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

The micro-fluidic chip is an analytical system with micro-channel control, which is formed by constructing micro-functional components such as a liquid storage tank, a micro-reaction chamber, a micro-pipeline, a micro-detection element and the like on a chip with a few square centimeters by a micro-machining technology. Therefore, they are also called micro total analysis systems, lab-on-a-chips (lab-on-a-chips), and the like. The micro-fluidic chip has the advantages of miniaturization, integration, portability, automation, low cost, low loss and the like, and the advantages also ensure wide application prospects in various fields, such as biomedicine, high-flux drug synthesis screening, preferable breeding of crops, environmental monitoring and protection, health quarantine, judicial identification research and the like. Among them, biomedicine is the main application field of the current microfluidic chip, and for example, the microfluidic chip for clinical examination has the most extensive market in China. The microfluidic chip technology has the main characteristics of high integration level and complete functions, but the chip has small volume, so that the complex operation of some liquid samples cannot realize effective operation on the chip. The present embodiment provides a microfluidic chip specifically for liquid mixing and quantitative transfer in view of the current situation.

Referring to fig. 1, the present embodiment provides a microfluidic chip, which includes a chip substrate 2, a sample cell 21, a liquid output port 291, and a fluid conveying pipeline for communicating the sample cell 21 with the liquid output port 291 are disposed on the chip substrate 2, and the sample cell 21 has an opening for injecting a liquid sample; the liquid conveying pipeline is communicated with a functional pool, and the liquid outlet 291 is externally connected with a negative pressure device so as to form negative pressure at the liquid outlet 291.

The sample pool 21 is filled with a liquid sample, the liquid sample flows out of the sample pool 21 and then enters the functional pool through the infusion pipeline, operation of a certain specific function of the hydraulic sample is achieved, then the liquid sample flows out of the functional pool and then flows out of the liquid output port 291 through the infusion pipeline, and subsequent operation is conducted.

Thus, the infusion line, the functional reservoir and the liquid outlet 291 form a single-channel liquid transfer channel. The chip base body 2 may further be provided with a plurality of liquid transfer channels, and the plurality of liquid transfer channels are respectively communicated with the sample cell 21, so that multi-channel liquid transfer as shown in fig. 2 is realized, which will be described later.

The main material of the chip substrate 2 is glass, ghost plate, Polydimethylsiloxane (PDMS) or high molecular polymer, and the high molecular polymer material may be polymethyl methacrylate (PMMA), Polycarbonate (PC), cycloolefin polymer (COP), Polyamide (PA), polybutylene terephthalate, or the like. The overall size of the chip base 2 is determined by the size of each unit (the sample cell 21 and each functional cell). Functional accessories such as a valve layer and a control layer of the chip substrate 2 can be determined according to specific functions as required, and a person skilled in the art can change the functions according to the requirements, and the embodiment does not make further restrictions.

The volume of the sample cell 21 can be 0.1 ml-2 ml, and the shape can be triangle, square, polygon, etc.

The infusion pipeline can be divided into a plurality of branch pipelines according to different positions, and the valve is also divided into a plurality of branch valves according to different positions. Specifically, the bottom of the cuvette 21 is connected to a branch pipe 210 for outputting the liquid sample in the cuvette 21, and the top of the cuvette 21 may be an opening or a sealing cover (not shown) with a filter device. The liquid outlet 291 is externally connected to a negative pressure device to form a negative pressure at the liquid outlet 291, and the negative pressure drives the liquid sample to be transferred from the sample cell 21 and the functional cell to the liquid outlet 291. Furthermore, the driving force for driving the transfer of the liquid sample on the chip substrate 2 may also be a positive pressure.

In addition, the chip base body 2 is further provided with a waste liquid pool 22, the waste liquid pool 22 is respectively communicated with the sample pool 21 and the functional pool (the metering pool 231), and the waste liquid pool 22 is provided with an opening 221 for communicating with the outside.

The volume of the waste liquid pool 22 can be 0.1 ml-2.5 ml, the shape can be triangle, square, polygon, etc., the sample pool 21 is connected with the branch pipeline 211 and is used for inputting redundant liquid samples, the top of the waste liquid pool 22 is provided with an opening 221, and the opening 221 is used as a negative pressure inlet or a positive pressure vent. The opening 221 may also be connected to the negative pressure port 271 through a multi-layer air channel structure, and those skilled in the art may change the air channel structure based on this embodiment.

In the microfluidic chip provided by the embodiment of the invention, the chip substrate 2 is provided with the sample cell 21, and the sample cell 21 is provided with an opening for injecting a liquid sample; the chip base body 2 is further provided with a liquid output port 291 and a liquid conveying pipeline for communicating the sample pool 21 with the liquid output port 291, the liquid conveying pipeline is provided with a functional pool in a communicating mode, a liquid sample is injected into the sample pool 21 through an opening and then flows into the functional pool through the liquid conveying pipeline, specific treatment on the liquid sample is completed in the functional pool, the treated liquid sample flows out of the liquid output port 291 through the liquid conveying pipeline, the liquid output port 291 is externally connected with a negative pressure device to form negative pressure at the liquid output port 291, the negative pressure is lower than normal pressure, fluid has the characteristic of flowing from high pressure to low pressure, and the negative pressure guides the liquid sample to flow from the sample pool 21 to the liquid output port 291 so as to perform subsequent treatment on the. The transfer of the liquid sample from the sample cell 21 to the liquid output port 291 realizes the transfer operation of the liquid sample on the microfluidic chip, so as to facilitate the subsequent test.

Further, the function pools include a metering pool 231, a transfer pool 261, a reagent pool 251, and a buffer pool 241. The functional pools with different functions are communicated with each other through a transfusion pipeline. The infusion pipeline is provided with a plurality of valves which are respectively connected between the adjacent functional pools and used for opening or closing the infusion pipeline so as to connect or disconnect the adjacent functional pools.

The infusion pipeline is a circular hollow pipeline, and the inner diameter of the infusion pipeline is between 0.01mm and 2 mm. According to the inner diameter range, the infusion pipeline is narrow, the internal pressure of the infusion pipeline is high, so that when a liquid sample circulates in the infusion pipeline, the liquid sample can fill the infusion pipeline, the liquid sample entering the infusion pipeline is quickly extruded and enters the infusion pipeline, the flowing speed of the liquid sample in the infusion pipeline can be increased, and the transfer of the liquid sample is accelerated.

The measuring cell 231 is a functional cell, and is communicated with a first air suction pipeline 21081 in addition to the liquid conveying pipeline, and the other end (negative pressure port 271) of the first air suction pipeline 21081 is used for connecting negative pressure. As shown in FIG. 1, the liquid outlet 291 is externally connected with a negative pressure device to form a negative pressure at the liquid outlet 291, and a certain negative pressure is correspondingly generated in the liquid conveying pipeline, but the metering pool 231 is far away from the liquid outlet 291, the negative pressure is weakened at the outlet of the metering pool 231, and the first air suction pipeline 21081 is communicated with the outlet of the metering pool 231, so that the negative pressure at the outlet of the metering pool 231 can be increased, and the speed of inputting and outputting a liquid sample by the metering pool 231 is increased.

The function of the cell 231 is to quantitatively extract the liquid sample in the sample cell 21, and the volume of the extracted liquid sample is the total volume of the geometric volume of the cell 231 and the geometric volumes of the branch pipes 21011 and 21021. A first suction duct 21081 is provided by the branch duct 21021 in order to draw the liquid sample by means of negative pressure.

In addition, the interior of the metering pool 231 can also be used as a reagent pre-buried area, and the pre-buried reagent can be freeze-dried powder, gel, granules or liquid. The outer surface of the metering pool 231 forms a tympanic membrane through a flexible material, or both sides of the metering pool 231 are hard membranes, the flexible material is a polydimethylsiloxane film (PDMS), a polyvinyl chloride film (PVC), a polypropylene film (PP), a polyethylene terephthalate film (PET) or the like, and the thickness is 0.01 mm-1 mm.

The reagent pool 251 and the transfer pool 261 are sequentially communicated and arranged at the output end of the metering pool 231 along the liquid output direction, the liquid output port 291 is communicated with the transfer pool 261, and reagents are pre-buried in the reagent pool 251.

The transfer tank 261 is communicated with the reagent tank 251 and is communicated with the liquid output port 291, and the output liquid volume of the liquid output port 291 is the difference between the geometric volume of the transfer tank 261 and the geometric volumes of the branch pipeline 21041 and the branch pipeline 21051. One side of the transfer tank 261 is a hard material or a film, the other side is a flexible material, a tympanic membrane is formed by the flexible material, the flexible material is a polydimethylsiloxane film (PDMS), a polyvinyl chloride film (PVC), a polypropylene film (PP), a polyethylene terephthalate film (PET) and the like, and the thickness is 0.01 mm-1 mm.

The reagent pool 251 is used for pre-embedding reagents, and the pre-embedded reagents can be freeze-dried powder, gel, granules or liquid.

The metering pool 231 can quantitatively extract the liquid sample in the sample pool 21, the reagent is pre-embedded in the metering pool 231 (or the reagent pool 251) to mix the liquid sample and the reagent, and various samples and quantitative transfer liquid can be effectively mixed through the arrangement of the metering pool 231 and the reagent pool 251, so that the defect that various samples and quantitative transfer liquid cannot be effectively mixed in the existing microfluidic field is overcome.

The transfer tank 261 is further communicated with a second air suction pipeline 21071, the second air suction pipeline 21071 is used for connecting negative pressure, the action of the second air suction pipeline 21071 is the same as that of the first air suction pipeline 21081, so that the negative pressure in the transfer tank 261 is increased, besides the negative pressure in the transfer tank 261 is increased by performing air suction treatment through the second air suction pipeline 21071, a part of liquid sample can be directly sucked for temporary detection or sampling and other operations.

The first air extraction pipeline 21081 and the second air extraction pipeline 21071 are connected with one end of negative pressure (namely the negative pressure port 271) and are both provided with a breathable water-stop film, and the negative pressure port 271 has the function of performing air extraction treatment on the metering pool 231, the transfer pool 261 and the communicated liquid conveying pipeline and absorbing liquid samples. The second air exhaust pipeline 21071 and the first air exhaust pipeline 21081 are both round pipes, the inner diameter of the second air exhaust pipeline is 0.01 mm-2 mm, the inner diameter is narrow, and the air exhaust speed at the negative pressure port 271 is accelerated.

The buffer pool 241 is communicated with the metering pool 231, the buffer pool 241 is provided with an opening 2411, and the opening 2411 is used for being communicated with the outside.

The buffer reservoir 241 functions to communicate the measuring reservoir 231 with the outside of the chip base 2 through the opening 2411, or with a positive pressure. This accelerates the flow rate of the liquid sample.

The liquid transfer channel, the function pool and the liquid output port 291 on the chip base body 2 form a single-channel liquid transfer channel, when the number of the liquid transfer channels on the chip base body 2 is multiple, the multiple liquid transfer channels are respectively communicated with the sample pool 21 and the waste liquid pool 22, so that the multiple-channel liquid transfer channels are formed on the chip base body 2, and a liquid sample entering the sample pool 21 can simultaneously enter the rear-end operation through the multiple-channel liquid transfer channels, so that the liquid transfer efficiency is improved.

The arrangement directions of the liquid transfer channels on the chip substrate 2 are the same, and the liquid output port 291, the liquid output port 292, the liquid output port 293 and the liquid output port 294 of the liquid transfer channels are all located at the same end of the chip substrate 2. Therefore, the liquid is transferred in the same direction, and the receiving part at the rear end can operate uniformly and effectively.

Specifically, as shown in fig. 2, the multi-channel liquid transfer channel includes a sample cell 21, a waste liquid cell 22, a metering cell 231, a metering cell 232, a metering cell 233, a metering cell 234, a buffer cell 241, a buffer cell 242, a buffer cell 243, a buffer cell 244, a reagent cell 251, a reagent cell 252, a reagent cell 253, a reagent cell 254, a transfer cell 261, a transfer cell 262, a transfer cell 263, a transfer cell 264, a liquid output port 291, a liquid output port 292, a liquid output port 293, a liquid output port 294, branch pipelines, a first pumping pipeline 21081, a first pumping pipeline 21082, a first pumping pipeline 21083, a first pumping pipeline 21084, a second pumping pipeline 21071, a second pumping pipeline 72, a second pumping pipeline 21073, a second pumping pipeline 21074, branch valves, a negative pressure port 271, a negative pressure port 272, a negative pressure port 273, and a negative pressure port 274, on a chip substrate 2.

When a multi-channel liquid transfer channel is provided on the chip substrate 2, the volumes of the sample cell 21 and the waste liquid cell 22 can be increased. The volume of the sample cell 21 can be 0.4ml, the bottom of the sample cell 21 is connected with the branch pipeline 210 for outputting the liquid sample, and the top of the sample cell 21 is provided with an opening for conveniently adding the liquid sample. The driving force for transferring the liquid sample to other positions of the chip substrate 2 through the liquid conveying pipeline is negative pressure.

The volume of the waste liquid pool 22 can be 0.5ml, the sample pool 21 is connected with the branch pipeline 211 and is used for collecting redundant liquid samples, an opening 221 is arranged at the top of the waste liquid pool 22, the opening 221 is used as a negative pressure inlet, and a breathable waterproof diaphragm is additionally arranged.

The metering pool 231, the metering pool 232, the metering pool 233 and the metering pool 234 function to quantitatively extract a liquid sample in the sample pool 21, and the volume of the extracted liquid sample is the total volume of the geometric volumes of the metering pool 231, the metering pool 232, the metering pool 233 and the metering pool 234 and the corresponding geometric volumes of a branch pipeline 21011, a branch pipeline 21012, a branch pipeline 21013, a branch pipeline 21014, a branch pipeline 21021, a branch pipeline 21022, a branch pipeline 21023 and a branch pipeline 21024. The liquid sample in the branch pipe 210 flows into the branch pipe 2101, the branch pipe 2102, the branch pipe 2103 and the branch pipe 2104, respectively, under the negative pressure.

The branch pipeline 21021, the branch pipeline 21022, the branch pipeline 21023 and the branch pipeline 21024 are respectively and correspondingly provided with a first negative pressure pumping pipeline 21081, a first pumping pipeline 21082, a first pumping pipeline 21083 and a first pumping pipeline 21084, so that a sample is pumped through negative pressure. The measuring tanks 231, 232, 233 and 234 can be used as reagent pre-buried areas, and the pre-buried reagents can be freeze-dried powder, gel, granules or liquid. The metering tanks 231, 232, 233 and 234 can be pre-filled with different reagents.

The measurement cells 231, 232, 233, and 234 were all hard films on both sides, and the volumes of the measurement cells 231, 232, 233, and 234 were equal to each other and were 0.05. mu.l.

The buffer pools 241, 242, 243 and 244 respectively communicate the measuring pools 231, 232, 233 and 234 with the outside of the chip through the openings 2411, 2421, 2431 and 2441, and can contain and store the excess liquid possibly present so as not to flow out of the chip. The buffer pool 241, the buffer pool 242, the buffer pool 243 and the buffer pool 244 are respectively communicated with the metering pool 231, the metering pool 232, the metering pool 233 and the metering pool 234 through a branch pipeline 21061, a branch pipeline 21062, a branch pipeline 21063 and a branch pipeline 21064.

Reagent pond 251, reagent pond 252, reagent pond 253, reagent pond 254's function are pre-buried reagent, and pre-buried reagent can be the freeze-dried powder to reagent pond 251, reagent pond 252, reagent pond 253, reagent pond 254 can be pre-buried different kinds of freeze-dried powder reagent respectively.

The transfer pool 261, the transfer pool 262, the transfer pool 263 and the transfer pool 264 are respectively communicated with the reagent pool 251, the reagent pool 252, the reagent pool 253 and the reagent pool 254 through corresponding branch pipelines 21031, 21032, 21033 and 21034, and are respectively communicated with a liquid output port 291, a liquid output port 292, a liquid output port 293 and a liquid output port 294, and the output liquid volumes of the liquid output port 291, the liquid output port 292, the liquid output port 293 and the liquid output port 294 are respectively the difference of the volumes of the corresponding transfer pool 261, the transfer pool 262, the transfer pool 263 and the transfer pool 264 and the volumes of the corresponding branch pipeline 21041, the branch pipeline 21042, the branch pipeline 21043, the branch pipeline 21044, the branch pipeline 21051, the branch pipeline 21052, the branch pipeline 21053 and the branch pipeline 21054. One side of each of the transfer tanks 261, 262, 263 and 264 is made of a hard material or a film, the other side of each of the transfer tanks is made of a flexible material, the tympanic membrane is formed by the flexible material, and the flexible material is a Polydimethylsiloxane (PDMS) film with the thickness of 0.02 mm.

The second air extraction pipeline 21071, the second air extraction pipeline 21072, the second air extraction pipeline 21073, the second air extraction pipeline 21074 and the corresponding first air extraction pipeline 21081, the first air extraction pipeline 21082, the first air extraction pipeline 21083 and the first air extraction pipeline 21084 have ports respectively corresponding to the negative pressure port 271, the negative pressure port 272, the negative pressure port 273 and the negative pressure port 274, the negative pressure port 271, the negative pressure port 272, the negative pressure port 273 and the negative pressure port 274 are air extraction ports, the negative pressure port 271, the negative pressure port 272, the negative pressure port 273 and the negative pressure port 274 are respectively provided with an air-permeable water-stop film, and the functions of performing air extraction treatment on the metering pool 231, the metering pool 232, the metering pool 233, the metering pool 234, the transfer pool 261, the transfer pool 262, the transfer pool 263, the transfer pool 264 and the communication pipeline and simultaneously absorbing the liquid sample. The inner diameters of the second air exhaust pipeline 21071, the second air exhaust pipeline 21072, the second air exhaust pipeline 21073, the second air exhaust pipeline 21074, the first air exhaust pipeline 21081, the first air exhaust pipeline 21082, the first air exhaust pipeline 21083 and the first air exhaust pipeline 21084 are all 0.02 mm. All the infusion pipelines have the width of 0.8mm and the depth of 0.5 mm.

The multi-channel liquid transfer channel is shown in fig. 2, and the operation flow of quantitatively mixing the sample and quantitatively transferring the liquid by the chip base 2 is as follows, but the protection range is not limited to the following operation flow, and the operation flow and the core technology variation range of the chip base 2 modified on the basis of the present embodiment still belong to the protection range of the present embodiment.

1. The negative pressure port 271, the negative pressure port 272, the negative pressure port 273, the negative pressure port 274 and the opening 221 are applied with negative pressure, the branch valve 2821, the branch valve 2822, the branch valve 2823 and the branch valve 2824 are opened, other branch valves are closed, a liquid sample in the sample pool 21 is divided into branch pipelines 2101, 2102, 2103 and 2104 through the branch pipeline 210, enters the branch pipeline 21011, the branch pipeline 21012, the branch pipeline 21013 and the branch pipeline 21014 through the branch valve 2821, the branch valve 2822, the branch valve 2823 and the branch valve 2824, enters the metering pool 231, the metering pool 232, the metering pool 233 and the metering pool 234, and fills the metering pool 231, the metering pool 232, the metering pool 233 and the metering pool 234.

2. The branch valve 2811 is opened, and the excess liquid sample in the sample cell 21 enters the waste liquid cell 22 through the branch pipe 210, the branch valve 2811 and the branch pipe 211 in sequence.

3. Opening the branch valve 2831, the branch valve 2832, the branch valve 2833, the branch valve 2834, the branch valve 2841, the branch valve 2842, the branch valve 2843 and the branch valve 2844, closing other branch valves, and allowing a part of the liquid sample in the measuring pool 231, the measuring pool 232, the measuring pool 233 and the measuring pool 234 to flow through the reagent pool 251, the reagent pool 252, the reagent pool 253 and the reagent pool 254 to respectively flow into the corresponding transfer pool 261, the transfer pool 262, the transfer pool 263 and the transfer pool 264, and filling the sample transfer pool 261, the transfer pool 262, the transfer pool 263 and the transfer pool 264. The other part of the liquid sample in the metering pool 231, the metering pool 232, the metering pool 233 and the metering pool 234 flows into the buffer pools 241, 242, 243 and 244.

And (3) sample mixing: opening a branch valve 2831, a branch valve 2832, a branch valve 2833, a branch valve 2834, a branch valve 2841, a branch valve 2842, a branch valve 2843 and a branch valve 2844, other valves are closed, pressure is applied to the flexible membranes of the transfer pools 261, 262, 263 and 264, the liquid in the transfer pools 261, 262, 263 and 264 is respectively extruded into the metering pools 231, 232, 233 and 234, then the flexible membrane of the transfer pool 261, the transfer pool 262, the transfer pool 263 and the transfer pool 264 is applied with negative pressure to restore the flexible membrane to the original shape, so that the liquid in the metering pool 231, the metering pool 232, the metering pool 233 and the metering pool 234 is sucked into the corresponding transfer pools 261, 262, 263 and 264, the aim of fully mixing the liquid with the pre-buried reagents in the reagent pool 251, the reagent pool 252, the reagent pool 253 and the reagent pool 254 is fulfilled repeatedly.

Quantitative transfer of sample out of the chip substrate 2: the branch valves 2851, 2852, 2853 and 2854 are opened, other branch valves are closed, and by applying pressure to the flexible membranes of the transfer pool 261, the transfer pool 262, the transfer pool 263 and the transfer pool 264, the liquid sample sequentially flows through the branch pipeline 21041, the branch pipeline 21042, the branch pipeline 21043, the branch pipeline 21044, the branch valve 2851, the branch valve 2852, the branch valve 2853, the branch valve 2854, the branch pipeline 21051, the branch pipelines 21052 and 21053 and the branch pipeline 21054 and is transferred out of the chip substrate 2, so that the whole process of quantitative mixing and quantitative transfer of the liquid sample in the chip is completed.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.