Batteries Used in Active Implantable Medical Devices / 中国医疗器械杂志

In recent years active implantable medical devices(AIMD) are being developed rapidly. Many battery systems have been developed for different AIMD applications. These batteries have the same requirements which include high safety, reliability, energy density and long service life, discharge indication. History, present and future of batteries used in AIMD are introduced in the article.

Study of Transcutaneous Wireless Bidirectional Communication System Based on Pulse Position Modulation / 航天医学与医学工程

Objective To find out a PPM-based transcutaneous wireless bidirectional communication system for implantable medical device.Methods The wireless communication system included device implanted in the body,controller and PDA outside the body.Pulse position modulation(PPM) was used for the wireless bidirectional communication between device implanted in the body and controller outside the body.Results A PPM-based transcutaneous wireless communication system was realized.Its wireless bidirectional communication distance between device implanted in the body with titanium container and controller outside the body was over two inches.This system was with good position availability.Conclusion Pulse position modulation is successfully used for transcutaneous wireless communication system,and average power consumption for communication device implanted in the body is lowered greatly compared with ASK modulation method.At the same time,the volume of communication device implanted in the body is decreased for antenna common-using idea.