Easily disassembled chip device for combined detection of male typical tumor marker

Abstract

The invention relates to an easily disassembled chip device for combined detection of male typical tumor markers and belongs to the field of analysis and testing. PDMS (polydimethylsiloxane) as a substrate of a micro-fluidic chip for the combined detection of the seven male typical tumor markers has a series of problems. The device has the characteristics that the substrate is made from PDMS withan original ecological surface; a pipeline of the chip is filled with micron-sized titanium dioxide particles; the titanium dioxide particles can be irradiated by preliminary visible light; the visible light is induced from the surfaces of the particles; the titanium dioxide particles have super hydrophilicity; a set of interparticle super-hydrophilic gaps of titanium dioxide particle filling compensates and surpasses the original strongly hydrophobic pipeline; a constant and super-hydrophilic modification effect is achieved; and at the same time, micropower ultrasonic waves induce an interfacial tension difference at the head end and the tail end of the chip to guide sample liquid to flow to a terminal along the pipeline of the chip.

Description

Technical field [0001] The invention relates to an easily disassembled chip device for combined detection of male typical tumor markers, which belongs to the field of analysis and testing. Background technique [0002] Tumor marker (TM) refers to a class of substances that are produced by tumor cells themselves or by the body's response to tumor cells during the occurrence and proliferation of tumors, and reflect the existence and growth of tumors, including Proteins, hormones, enzymes (isoenzymes) and oncogene products, etc. Testing the tumor markers in the blood or body fluid of the patient can detect the tumor early in the tumor screening, and observe the efficacy of tumor treatment and judge the prognosis of the patient. Currently commonly used clinical tumor markers 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 tumor of the digestive system, Markers for lung...

AI Technical Summary

Problems solved by technology

[0008] But it's not that simple

[0009] First, this polydimethylsiloxane material, which is referred to by the acronym PDMS, is itself a strongly hydrophobic material, and channels are built on this material. modification operation, then, after the overall assembly is completed, that is, after the cover is covered, because the inner surface of the channel in the structure occupies most of the inner surface of the liquid flow channel, then the inner surface of the PDMS channel is The strong hydrophobicity is the decisive factor, it will make it very difficult for the polar liquid fine flow similar to the aqueous solution to pass through, and its flow resistance is so large that even the general micropump is difficult to push, of course, if the cover sheet is also If you choose to use the PDMS material, then the problem is basically the same, with minor differences; therefore, in the prior art, it is necessary to modify and modify the inner surface of the channel on the PDMS material: then, this is for the PDMS channel Is the modification operation of the inner surface of the channel 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 channel modified by the surface unable to maintain for a long enough time. The maintenance time of the internal surface state is roughly only enough to complete the time required for the internal test experiment in the laboratory; in other words, the surface state of the PDMS channel inner surface after surface modification or surface modification is formed after modification It cannot last for a long time, but it will automatically tend to or change back to the surface state before the surface modification, and return to the original strongly hydrophobic surface state in a short period of time. Then, just imagine, such a slight Can flow control 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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