Microfluidic chip device used for fifteen-channel combined detection on plurality of tumor makers

Abstract

The invention relates to a microfluidic chip device used for fifteen-channel combined detection on a plurality of tumor makers, and belongs to the field of analysis and testing. Advantages are obvious if PDMS, which is polydimethylsiloxane, is adopted to prepare a substrate of a universal-type microfluidic chip device used for combined detection on more than ten tumor makers, whereas, a plurality of problems which need to be overcome exist, and the invention aims to solve the problems. The key points of the invention comprise PDMS which has an original ecology surface is selected as a substrate, and an elastic clamp which is equipped with a micro ultrasonic wave transducer on a clamping arm is located at a neighbouring position of a sample liquid terminal of a microfluidic chip by elastic occlusion, and in addition, an ultrasonic wave attenuator is arranged on a sample introduction terminal of the microfluidic chip, so as to achieve a rapid decrease of ultrasonic wave intensity in a short distance, so that interfacial tension difference is formed at two ends of the chip, and accordingly, a sample liquid is forced to flow along an originally hydrophobic capillary tube channel to the terminal direction. The device can work without using a micropump.

Description

technical field [0001] The invention relates to a microfluidic chip device for joint detection of multiple tumor markers with fifteen channels, belonging to the field of analysis and testing. Background technique [0002] Tumor markers (tumor markers, TM) refer to a class of substances produced by tumor cells themselves or produced by the body's response to tumor cells during the occurrence and proliferation of tumors, reflecting the existence and growth of tumors, including Proteins, hormones, enzymes (isoenzymes) and oncogene products, etc. Testing the tumor markers in the patient's blood or body fluids can detect tumors early in the tumor screening, observe the curative effect of tumor treatment and judge the prognosis of patients. Currently, the tumor markers commonly used clinically are: (1) alpha-fetoprotein (AFP) is a marker for primary liver cancer, testicular cancer, ovarian cancer and other tumors; (2) carcinoembryonic antigen (CEA) is a marker for digestive syste...

AI Technical Summary

Problems solved by technology

[0008] But it's not that simple

[0009] First, this polydimethylsiloxane material, the material referred to by the acronym PDMS, is itself a strongly hydrophobic material. Microchannels are built on this material. If the microchannels are not targeted The modification operation of the surface of the channel, then, after the overall assembly is completed, that is, after the cover is covered, because the inner surface of the micro channel in the structure occupies most of the inner surface of the liquid flow channel, then the PDMS micro channel The strong hydrophobic characteristic of the inner surface of the channel is the decisive factor, which will make it very difficult for the polar liquid flow similar to the aqueous solution to pass through, and its flow resistance is so large that even ordinary micropumps are difficult to push. Of course, If the cover sheet also chooses to use the PDMS material, then the problem is basically the same, with little difference; therefore, in the prior art, it is necessary to modify and modify the inner surface of the microchannel on the PDMS material; then , is this modification operation for the inner surface of the PDMS microchannel very troublesome? That's not the problem. What constitutes a serious technical problem is another problem: the PDMS polymer molecules in the bulk phase of the PDMS material substrate have the characteristics of automatic diffusion and migration to the surface. The characteristics of polymer molecules diffusing and migrating to the surface automatically will make the modified state of the inner surface of the microchannel modified by the surface modification unable to maintain for a long enough time, and the microgroove after surface modification The maintenance time of the inner surface state of the channel is roughly only enough to complete the time required for the internal test experiment in the laboratory; in other words, the inner surface of the PDMS microchannel after surface modification or surface modification is formed after modification The surface state of the surface does not last long, but quickly tends to or changes back to the surface state before the surface modification, and returns to the original strongly hydrophobic surface state in a relatively short period of time. Then, just imagine, Can such microfluidic chips be produced in large quantities, stored in large quantities, and widely promoted? The answer is obvious, that is, impossible

This problem has also existed for many years, and so far, it has not been properly solved

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