Method and device for detecting position of fluid channel

Abstract

The invention relates to the technical field of medical detection, in particular to a device and a method for detecting the position of a fluid channel. According to the technical scheme, two pairs of special handled small electrodes are placed on two appointed positions in the middle or a fluid channel pipeline, impedance between the electrodes is collected so as to achieve detecting to the position of the fluid channel, and therefore extracting amount of to-be-detected solution of blood is controlled, and reliability of measurement is increased, furthermore, impedance of the solution is detected through an alternating current impedance method so as to achieve measurement with high precision, and in addition, the position of the fluid channel is detected and meanwhile whether the fluid channel is mixed with bubbles or not can be further judged, and corresponding process is conducted, and therefore precision of system detection is improved.

Description

technical field [0001] The invention relates to the technical field of medical detection, in particular to a method and device for liquid path position detection. Background technique [0002] The liquid circuit position detection system is often used in related instruments such as blood analysis and blood gas analysis, and is mainly used to control the extraction volume of the solution to be tested or blood. When the diameter of the liquid pipeline is large, it is generally easy to put most of the liquid sensors on the market into the liquid pipeline. By processing the electrical signal, it is easier to detect the position of the fluid pipeline. With the continuous development of blood testing technology, blood analysis instruments are getting smaller and smaller, correspondingly, the amount of blood drawn or the solution to be tested will be less and less, which requires the diameter of the liquid channel to be smaller and to use small sensors to realize The precise posit...

AI Technical Summary

Problems solved by technology

In addition, commonly used detection methods for liquid path position include capacitive sensor, DC electrode type, etc. These technologies also have shortcomings. The capacitive sensor requires a large area to achieve accurate measurement; the DC impedance measurement method measures solutions with large impedance, and The matching resistor has a large resistance value, resulting in insensitive detection response

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