Liquid flow switching device without fluid retention

Abstract

The invention relates to a liquid flow switching device without fluid retention, and the device can be used for, but not limited to, biological tissue treaters. Before the operation of biological tissue microscopic sectioning, a biological tissue treater pumps liquid medicines of different concentrations into a treatment trough for acting on a biological tissue according to certain sequence and time. The liquid flow switching device of the invention is one of the key parts of the treater, and is composed of an upper pipe, several lower pipes, a leakproof jacket, a control ring, a lower pipe rack, location holes, an infrared light emitter, an infrared light receiver, a guide rail assembly, grooves, flanges and sealing rings. Each lower pipe is lead to different liquid medicines, and is communicated with the upper pipe in order. The leakproof jacket can move along the upper pipe. The location holes, the infrared light emitter and the infrared light receiver assist the lower pipes locating. Then the leakproof jacket moves downwards under the effect of the control ring till the grooves and flanges are jointed tightly, so that an enclosed space can form inside the upper pipe and a lower pipe. When the inside of the upper pipe bears a negative pressure, a liquid medicine can be pumped upwards from a lower pipe. The whole process generates no fluid retention.

Description

technical field [0001] The invention relates to a switching device for liquid flow, which can avoid retention of liquid medicine when switching between different liquid flows. The invention is used but not limited to a biological tissue processing machine, is one of its key components, and belongs to the field of medical equipment. Background technique [0002] The biological tissue processor is used as a pre-processing step for the microscopic sectioning of biological tissue. After a series of steps such as fixation, dehydration, transparency and wax immersion, it can be cut into thin slices with a thickness of only a few microns, and then made into microscope sections with glass as the carrier. [0003] At present, there are three methods for this treatment process in the world, (1) purely manual; (2) the liquid is placed in different containers, and the biological tissue is carried by the mechanical arm to move, and then immersed in the liquid medicine in each container ...

AI Technical Summary

Problems solved by technology

When switching the liquid medicine, this small volume of retained liquid is mixed with the liquid medicine of the next step, causing the liquid medicine to fail prematurely

At present, only a few countries such as the United Kingdom, Germany and Japan produce this type of equipment, and our country can only produce equipment in mode (2) and cannot produce equipment in mode (3).

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