Bubble monitoring device for portable blood purification system

Abstract

The invention discloses a bubble monitoring device for a portable blood purification system. The monitoring device mainly comprises an ultrasonic bubble detector which comprises an ultrasonic transmitting device and an ultrasonic receiving device. The monitoring device functions through steps as follows: (1) acquiring the regular rectangular signal pulse width by processing the ultrasonic pulse signal detected by the receiving device through the signal processing module; (2) comparing the pulse width of the signal Tc and the set threshold by the comparator, large bubble threshold is Tc1, no bubbles and micro bubbles threshold is Tc0. When Tc > / = Tc1, the bubbles directly enter the CPU processor and start the alarming device; when Tc < / =Tc0, the bubbles are directly filtered out; when Tc0 <Tc <Tc1, the bubbles enter the CPU processor and be cumulated, when the cumulative amount per minute is greater than the set value T, the alarming device is triggered. The reliability of the bubble monitoring device is greatly enhanced, timely and accurate warning of the bubble is guaranteed, and various disturbances are also effectively avoided.

Description

technical field [0001] The invention relates to an air bubble monitoring device, in particular to an air bubble monitoring device used in a portable blood purification system under rocking and vibrating field conditions. Background technique [0002] As the main detection device on the current dialysis equipment, the bubble detector is mainly used to detect whether there are bubbles in the venous return section of the extracorporeal circulation in real time, continuously and reliably during the whole dialysis process, so as to prevent the gas from entering the patient's body and causing gas Embolism to ensure the safety of dialysis patients. When there is air, the machine sends out an alarm signal, which makes the blood clip close and prevents the blood from flowing back into the patient's body. [0003] There are three commonly used detection methods: (1) capacitive detectors; (2) infrared photoelectric detectors; (3) ultrasonic detectors. Because the ultrasonic detector ...

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Problems solved by technology

[0009] First, the detection threshold of the existing air bubble sensor is generally calibrated when the sensor leaves the factory. When there is an air bubble in the blood, it will immediately alarm, which is very sensitive. However, this has caused certain defects for the portable dialysis machine, because the design of the portable dialysis machine The purpose of the device is designed for treatment in the field or during sports. The instrument is often shaken. At this time, tiny air bubbles will continue to be produced in the blood and move with the blood flow. This will cause continuous alarms from the air bubble sensor Not available;

[0010] Second, because the shaking of the instrument will generate a lot of interference signals, it will also affect the normal application of the sensor

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