一种基于颜色传感器的血液净化设备漏血检测器  

Blood leak detector based on color sensor in blood purification equipment

作　　者：程海凭[1] 王艳[1] 王选[1] 刘志锋 

机构地区：[1]上海医疗器械高等专科学校医学电子与信息工程系,上海200093 [2]威海威高血液净化制品有限公司上海分公司,上海200021

出　　处：《中国医学物理学杂志》2015年第3期327-331,共5页Chinese Journal of Medical Physics

基　　金：军队"十二.五"重大项目(AWS11J03)

摘　　要：目的:为防止血液净化设备的漏血风险,研制了一种新的漏血检测器。它可以克服简单漏血检测器不能辨别颜色容易误判的缺点,以及一般可辨颜色漏血检测器结构复杂的不足。方法:用白色发光二极管产生稳定亮度的光源,以颜色传感器TCS3200作为光检测元件,用单片机进行控制、换算、判断、报警和通讯,构建漏血检测器系统。将测得的RGB信号转换为HSL信号,确定漏血判断的参数,并分析阈值获取的条件和方法。结果:得到亮度等信号对于0.1‰的漏血浓度变化具有明显的分辨力,饱和度、色度信号对于在0.5‰的临界漏血浓度附近的红色变化都能辨别。可见,亮度可以作为漏血判断的依据,同时色度作为防止误判的参考。结论:此漏血检测器灵敏度高,安全可靠;对于非漏血因素引起的回路透光率变化有防止误判能力;能自适应器件老化、表面污损、透析管透光率变化等因素造成的亮度变化;有频率检测、数值换算、均值滤波、发光自检、双向通讯等智能化功能;硬件结构简单,调试简便,抗干扰能力强。Objective To develop a new blood leak detector for preventing the risk of blood leakage in blood purification equipment. And the new blood leak detector can overcome shortcomings of simple blood leak detector that color can not be distinguished and easy to be distinguished wrongly, and conquer the complex structure of the general color-perceptible blood leak detector. Methods The blood leak detector system was composed of the following 3 parts： a white light-emitting diode producing light source with stable lightness, a color sensor TCS3200 detecting light, and a MCU applied to control, converse, judge, alarm, communicate and construct a system of blood leak detector. The measured RGB signals were converted to HSL signals to determine the parameters for blood leak judgment, and to analyze the conditions and methods for obtaining the threshold. Results The luminance signal had an obvious resolution of the change of blood leak concentration of 0.1%0. Saturation and chrominance signals could distinguish the change of red near the critical blood leak concentration of 0.5 %o. Brightness could be used as the basis of blood leak judgment, and chrominance could be used as the reference to prevent misjudgment. Conclusion This blood leak detector, with high sensitivity, safety and reliability, simple hardware structure, convenient debugging and strong anti-interference ability, can prevent misjudgment of the transmittance change in the loop not caused by blood leak, and it is adaptive to brightness variation caused by device aging, surface fouling, the change of light transmittance of dialysis tubing and so on. This detector also has intelligent function of frequency detection, numerical conversion, mean filter, luminescence self-detection and two-way communication etc.

关 键 词：漏血检测器 血液净化设备 颜色传感器 TCS3200 RGB HSL 

分 类 号：TH773[机械工程—仪器科学与技术]