Digital medical ultrasonic bubble detector

Abstract

A digital medical ultrasonic bubble detector is composed of a light-emitting diode, an ultrasound transmitting transducer, a probe, a control circuit board, a fastener, a signal output line, a back cover and an ultrasound receiving transducer. The top of the probe is provided with a groove and a pipe passes through; the ultrasound transmitting transducer and the ultrasound receiving transducer aretwo piezoelectric ceramic oscillator plates which have same parameters and are symmetrically adhibited to the outer walls at both sides of the groove firmly; and the light-emitting diode are equippedto the top of the probe. When the pipe is filled with liquid after the transmission of ultrasound, an ultrasound echo pulse exists in the pipe; if the bubble exists, the echo pulse disappears immediately. The electronic circuit of the invention determines whether the echo pulse is qualified to a preset value. If the echo pulse is qualified, the object in the pipe is determined to liquid and the light-emitting diode at top of the probe is lightened; If the echo pulse is not qualified, the existence of the bubble is determined and the light-emitting diode is turned off.

Description

Technical field: [0001] The invention relates to a sensing device for detecting bubbles in pipeline fluid, in particular to a digital medical ultrasonic bubble detector. Background technique: [0002] Existing detectors for measuring air bubbles in fluid pipelines have a variety of optical or continuous ultrasonic detectors. The principle is to directly detect the light intensity signal or ultrasonic signal intensity transmitted through the pipeline, and based on the converted voltage signal. Change to determine whether there is liquid or air bubbles in the pipeline. Their common characteristics are that they all belong to the category of analog circuits, with complex sensitivity adjustment, poor adaptability to pipeline materials, more sensitive to external environmental factors, and complex interfaces with microcontrollers. The optical detection method is susceptible to the interference of external light intensity, and has extremely high requirements for the transparency and c...

AI Technical Summary

Problems solved by technology

The two types of waves are mixed together, which greatly increases the difficulty of identifying the required signal, resulting in low detection accuracy, high false alarm rate, complex product debugging, and poor consistency

In some medical fields, such as human transfusion and blood component reinfusion, the above-mentioned detectors may cause the air bubbles in the pipeline to enter the human blood circulation system uncontrollably, thereby causing local air embolism in the blood circulation system and causing serious damage to human health. harm

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