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为了诊断腹主动脉瘤腔内修复术(EVAR)术后是否发生内漏,设计开发了基于无线供能的微型植入式压力检测系统,对瘤腔血压进行植入式无线检测。系统包括:微型无线血压传感器、能量发射线圈、数据读取器和数据处理软件。无线供能的耦合效率在根本上取决于耦合系数,在本设计中,采用铁芯线圈作为能量接收线圈,并通过理论分析和实验研究,优化接收线圈几何尺寸以提高耦合系数。为了提高能量传输的稳定性和整体效率,设计了基于无线通讯的电压反馈回路,实现能量发射功率的自适应调整。采用开发的系统样机进行了初步实验。由实验可知,无线供能的微型植入式血压检测系统可行有效,能准确可靠地采集和无线发送压力数据,能量发射线圈工作距离在8cm以内,数据读取器工作距离在50cm以内。
In order to diagnose the endoleak after endovascular repair of abdominal aortic aneurysm (EVAR), a micro implantable pressure detection system based on wireless power supply was designed and developed to carry out implantable wireless detection of tumor pressure. System includes: miniature wireless blood pressure sensor, energy transmitting coil, data reader and data processing software. The coupling efficiency of wireless power supply is fundamentally decided by the coupling coefficient. In this design, the core coil is adopted as the energy receiving coil, and the theoretical analysis and experimental research are carried out to optimize the receiving coil geometry to improve the coupling coefficient. In order to improve the stability and overall efficiency of energy transmission, a voltage feedback loop based on wireless communication is designed to realize adaptive adjustment of energy transmission power. A preliminary experiment was carried out using the developed system prototype. Experiments show that the wireless implanted micro-implantable blood pressure detection system is feasible and effective, can accurately and reliably collect and send pressure data wirelessly, the working distance of the energy transmitting coil is within 8cm and the working distance of the data reader is within 50cm.