基于容积补偿法和电阻抗法的小型循环动态监测系统的开发

Development of a Handy-type Monitoring System for Cardiovascular Haemodynamic Functions Based on the Volume-compensation and Electrical Admittance Method

介绍了一种基于容积补偿法和电阻抗法的小型循环动态监测系统的开发。系统中,采用指动脉局部加压技术及相应的检测装置,改善了全周加压袖套所存在的严重的淤血问题;运用新型检测方法,提高了信号检测的稳定性;应用移动线圈式电空变换器,大幅降低了系统使用的噪声。研究还探讨了心拍出量连续检测时胸部两重圆筒模型的适用性问题,以及用点状电极替代带状电极时的最佳配置。试验表明,开发的监测系统可以满足人们在自由行动下每一心拍循环动态变化的检测,携带舒适性有了明显提高,可实现了循环动态信息的无约束无创性长时间连续检测。

A handy-type monitoring system for cardiovascular haemodynamic functions based on the volume-compensation and electrical admittance method is developed. In this system, the inconvenient and discomfort due to cuff occlusion of the biological segment for BP measurement is improved by developing a new device using a local pressurization method, the stability for the physiological information detection is improved by developing a new detecting system, and the noise during detection using the system is greatly reduced by using a newly developed nozzle-flapper type electro-pneumatic converter. Also, for electrical admittance cardiography to estimate CO, the applicability of a two- compartment coaxial cylindrical model and the optimal position of a spot-electrode array that is used to replace the conventional band-electrode are discussed in this research. Experimental result shows that the monitoring system should satisfy non-invasive BP and CO measurement on beat by beat, and the comfort of measurement is significantly improved.