Sampling needle liquid detection device for in-vitro diagnostic instrument

By designing a liquid detection device including a sampling needle excitation circuit and a liquid level algorithm system, the problem of low sensitivity and accuracy of liquid detection in the prior art is solved, and high sensitivity and high accuracy detection of different liquids is achieved, which is suitable for miniaturized in vitro diagnostic equipment.

CN222671488UActive Publication Date: 2025-03-25SHENZHEN TORUI BIOTECHNOLOGY CO LTD
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Patent Information

Application Number
CN202420744507.7
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-04-09
Publication Date
2025-03-25
Estimated Expiration
2034-04-09

AI Technical Summary

Technical Problem

In the prior art, the sensitivity and accuracy of liquid detection are low, making it difficult to achieve accurate liquid detection in in vitro diagnostic instruments.

Method used

A liquid detection device for sampling needle used in vitro diagnostic instruments is designed, including sampling needle, sampling needle excitation circuit, signal capture circuit, signal shaping circuit, liquid level algorithm system, motion control unit and motion unit. By configuring a sample pin excitation circuit with biased capacitors and inductors, it is possible to intelligently judge the true or false contact liquid, and improve the sensitivity and accuracy of liquid detection.

Benefits of technology

It realizes accurate detection of different mass, density, composition and small and micro liquids, improves the sensitivity, accuracy and detection speed of liquid detection, and is suitable for in vitro diagnostic equipment that is constantly miniaturized.

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Abstract

The utility model provides a sampling needle liquid detection device for an in-vitro diagnostic instrument. The sampling needle liquid detection device comprises a sampling needle, a sampling needle excitation circuit, a signal capturing circuit, a signal shaping circuit, a liquid level algorithm system, a motion control unit and a motion unit which are electrically connected in sequence, the sampling needle excitation circuit is provided with a biased capacitor and an inductor; the signal capturing circuit is used for collecting an electric signal of liquid touch of the sampling needle; the signal shaping circuit is used for converting the electric signal into a capacitance value; the liquid level algorithm system is used for judging whether liquid is contacted according to the capacitance value; the motion control unit is used for controlling the motion unit to act; the motion unit is used for driving the sampling needle to move. The device is simple in structure and smaller in size, and meets the requirement that in-vitro diagnostic equipment which is continuously miniaturized can be implanted; the sampling needle excitation circuit is provided with a bias capacitor and a bias inductor, the excitation frequency range can be adjusted according to actual application, true or false liquid touch can be intelligently judged, the liquid detection sensitivity is improved, and the liquid detection accuracy and the detection speed are improved.
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