This textbook Medical Electronics has been written to meet the requirements of students of Engineering Colleges and Polytechnics. This book is aimed to provide the students a comprehensive knowledge of electrophysiology and bio-potential recording, bio chemical and non electrical parameter measurements, assist devices and bio-telemetry, radiological equipments, recent trends in medical instrumentation The materials of the reference books have noteworthy influence on this book. The author is thankful to her colleagues and students for their assistance in the preparation of this book. Finally, the author wishes to express her gratitude to M/s. Sara Publications for bringing out this book within a short span of time.