System of magnetic coupled PPM transcutaneous wireless communication
There are still some problems in telemetry technique for implantable medical systems now,such as relatively high power consumption,complex circuits or large bulk.In order to solve above problems,an effective pulse position modulation (PPM) method is adopted in this paper,that make possible the design of simultaneously lower power consumption,good communication distance and good displacement tolerance while keeping circuitry simple,particularly in the implantable device.PPM is frequently used in lower power consumption or high reliability systems.We use 2-PPM in this paper,all the coding and decoding processes of PPM are completed with microchip.The approach of transmitting signal is via two magnetic coupling coils,air-cored coil of Ф50mm for programmers and ferrite-cored coil of Ф3.8mm for implantable device.A magnetic coupled PPM transcutaneous wireless communication resolution is presented in this paper.Fullbridge topology with push-pull driving is adopted as amplifier in programmer.Compared with the common-used class-E amplifier,the full-bridge one is simple and reliable.In this paper,over two inches bidirectional communication distance between implantable device in the body,with titanium container,and programmer outside the body is realized,at the same time,the communication system is with good displacement tolerance and coil displacement mismatch question is well solved.The average power consumption is about 33uA under typical condition for implantable communication device in the PPM system,it is lowered greatly compared with our amplitude shift-keying (ASK) system,ASK’s average power consumption is about 10.3mA at the same test condition.
Implantable transcutaneous wireless communication PPM low power consumption coupled coils
Weiming Wang Bozhi Ma Hongwei Hao Luming Li
Tsinghua Space Center,Tsinghua University,Beijing,China
国际会议
7th Asian-Pacific Conference on Medical and Biological Engineering(第七届亚太地区生物工程学术会议)
北京
英文
2008-04-22（万方平台首次上网日期，不代表论文的发表时间）