Portable blood purifying system bubble monitoring device and method

Abstract

The invention discloses a bubble monitoring device used in a portable blood purification system, comprising an ultrasonic bubble detector, a signal processor, a comparator, a CPU processor and an alarm device; the ultrasonic bubble detector is installed on both sides of a blood catheter; the signal processing The device is connected with the ultrasonic bubble detector to eliminate the interference signal and form a regular rectangular signal pulse width Tc; the comparator is connected with the signal processor, and the CPU processor is connected with the comparator and the alarm device respectively. The comparator compares the rectangular signal pulse width Tc with the set large bubble threshold Tc1, no bubble and micro bubble threshold Tc0, when Tc≧Tc1, the alarm device is activated directly; when Tc≦Tc0, it is directly filtered; when When Tc0﹤Tc﹤Tc1, the cumulative calculation is carried out, and when the cumulative amount per minute is greater than the set value T, the alarm device is activated. The reliability of the air bubble monitoring device of the present invention has been greatly enhanced, which not only ensures timely and accurate alarm of the air bubbles, but also effectively shields various disturbances.

Description

technical field [0001] The invention relates to the field of blood purification, in particular to a bubble monitoring device and method used in a portable blood purification system. 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] Generally, there are three commonly used detection methods: (1) capacitive detector; (2) infrared photoelectric detector; (3) ultrasonic detector. Since the ultrasonic detector has the characteristics of strong...

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Problems solved by technology

[0008] 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;

[0009] Second, due to the shaking of the instrument, a lot of interference signals will be generated, which will affect the normal application of the sensor

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