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为实现人工心肺复苏术中胸外按压深度测量,采用两片三轴加速度传感器分别内置于病人胸部按压垫和背部按压垫内,采集加速度经预处理后进行二次积分得到的按压积分深度。建立了基于胸外按压压力的积分复位机制,通过采集胸外按压压力并识别特定压力阈值点和压力最大点,分别作为二次积分的开始点和结束点,减小积分累计误差。最后采用了一种软件补偿算法进一步提高胸外按压测量精度。通过283次胸外按压结果进行积分与DAQ采样实际按压深度比较,发现在95%的置信范围内,测量精度可以达到±0.6cm。胸外按压深度的实时精确测量有利于心肺复苏术中施救者对按压深度的控制,提高心肺复苏成功率。
In order to realize the depth measurement of chest compressions in artificial cardiopulmonary resuscitation, two three-axis accelerometers were built in the chest compressing pad and the back compressing pad, respectively, and the depth of the compressive integral obtained by the second integral after acceleration was collected. The integral reset mechanism based on the pressure of chest compressions was established. By collecting the pressure of chest compressions and identifying the specific pressure threshold points and pressure maximum points, they were used as the starting point and the end point of the second integral respectively to reduce the integral cumulative error. Finally, a software compensation algorithm is used to further improve the measurement accuracy of chest compressions. Comparing 283 chest compression results with actual DAQ sampling depth, it was found that the measurement accuracy can be ± 0.6 cm over a 95% confidence range. The accurate real-time measurement of the depth of chest compressions is helpful for the rescuers in CPR to control the depth of compression and improve the success rate of cardiopulmonary resuscitation.