一种无线无源膀胱压力监测系统的设计  

Design Of AWireless And Battery-free Bladder Pressure Monitoring System

作　　者：李春婵[1] 张旭[1] 李刚[2] 任朝晖[1] 刘庆凯[1] 阎立丽[1] 

机构地区：[1]首都医科大学生物医学工程学院,北京100069 [2]天津大学精密仪器与光电子工程学院,天津300072

出　　处：《中国医学物理学杂志》2014年第2期4788-4791,共4页Chinese Journal of Medical Physics

基　　金：北京市自然科学基金资助;基金号:3122011

摘　　要：目的:针对由脊髓损伤所致的排尿障碍所采用的植入式治疗方案中,仪器使用寿命受电池电量制约的问题。本文基于电磁耦合原理,提出一种无线无源的膀胱压力监测系统。方法:该系统由体内压力监测器和体外接收器两部分构成。体内压力监测器以MSP430单片机为控制核心,通过压力传感器采集膀胱压力,并将所测的压力通过无线模块传出至体外接收器。体外接收器负责接收数据,并通过线圈耦合能量给体内压力监测器进行供电。结果:经实验测得:体外线圈的最佳驱动频率为558 kHz,体内压力监测器可工作的最大线圈距离为10 cm,测压范围为0 cmH2O^150 cmH2O,分辨率为1mmH2O。结论:该无线无源膀胱压力监测器可实现数据和能量的无线传递,压力测量范围满足临床应用需求。Objective： To solve the battery-relate limited service life problem faced by the implants to cure voiding dysfimction caused by spinal cord injury, thispaper presents a wireless and battery-flee bladder pressure monitoring system based on the principle of electromagnetic coupling. Methods：This system containsan inner pressure detector and an external controller. The inner part takes MSP430 microchip as a core component;Pressure of the bladder is measured by a microsensor andtransmitted via the inner RF module.The external controller is major for receiving data and coupling power via coils to power the implant bladder pressure detector. Results： It is experimentally measured that the maximumcoil to coil coupling distance to power the inner pressure detectorisl0cmwhen the frequency of the current in the external coils is set at 558 KHz. This system covers aneftbctive pressure range of 0 cmH2OM 50 cmH20, with a resolution better than 1 mmH20. Conclusions：The wireless and battery-free bladder pressure monitoring systemcan transfer data and energy, wirelessly and its pressure measurement range lneets the needs of clinical applications.

关 键 词：无线无源 膀胱压力 电磁耦合 排尿障碍 脊髓损伤 

分 类 号：R766.43[医药卫生—耳鼻咽喉科]