Liquid filtering device and filtering method thereof

Abstract

The invention provides a device used for filtering a liquid. The device includes a flow channel and a filtering film. The flow channel is provided with an inlet and an outlet. The filtering film is provided with a plurality of holes. The flow channel is arranged on the filtering film in an overlapping manner. And when the liquid flows through the flow channel, the liquid contact with the filtering film. The device in the invention has a structure satisfying cross flow filtering principle. Thus, parallel shear stress can be generated by the liquid in the flow channel, thereby avoiding impurity accumulation in the holes of the filtering film.

Description

technical field [0001] The invention relates to a liquid filtering device and a filtering method thereof. Background technique [0002] Blood is responsible for the important work of oxygen and energy transmission in organisms, and is one of the indispensable elements for the normal operation of life systems. Based on this point, various blood-centered application technologies have been developed in the fields of clinical treatment and medical testing, hoping to further solve the discomfort caused by illness through accurate and rapid acquisition / analysis of cells or substances contained in blood. Improve the quality of human life. Under this concept, blood separation or filtration technology, which is the basis of many advanced applications, has always been regarded as one of the key development projects. [0003] At present, known techniques for separating blood cells and plasma can be mainly divided into four categories. The first is centrifugation technology. Through ...

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Problems solved by technology

However, the biggest problem with this technology is the formation of filter cake on the surface of the membrane. Especially with the increase of blood flow, the thickness of the filter cake will inevitably increase correspondingly, so that it must be washed and removed every time it is used, which costs a lot. more manpower

In addition, and more importantly, deep filtration often creates greater pressure on the blood cells in the blood, causing hemolysis during the filtration process, resulting in failure of the separation operation

[0007] Based on the above, it is obvious that the known technology of separating blood cells to obtain plasma inevitably has problems such as large sample consumption, expensive equipment that does not meet the application cost, long operation time and / or cumbersome process steps. Therefore, how to provide a low-cost, A liquid filtration device with a simple structure not only responds quickly, but also requires a small amount of sample, and its operation is economical. More importantly, it can effectively avoid the formation of filter cake and hemolysis, which has become an important issue.

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