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.
Electric Power Supplies ; Prostheses and Implants

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.

Objective Comprehensive standards of active implantable medical devices with high risks are required by China's current industrial development, and standard problems and ideas are discussed in this paper.Methods Analysis of the status of China's active implantable medical device standards and international standards. For the booming field for active implantable medical devices with high risks, international standard’s problems, ideas and trends are analyzed. Results Bottleneck of the development of China's active implantable medical device standards is the lack of Chinese medical devices industry actual independent research and development capability. China's independent standard research on the basis of independent core technology of active implantable medical devices is the opportunity to promote the internationalization of China standard.Conclusion Improving the standards of active implantable medical devices based on independent core technology, combined with problems of existing international standards, to further improve and develop international standards and lead high level international technical standards.