From network deployment to secure monitoring, this book addresses the latest developments in healthcare sensor networks—medical monitoring devices implanted on the body or in the surrounding infrastructure. The text discusses fundamental concepts and provides examples of clinical applications, including sensors to monitor physical activity in children and wearable gait assistants for people with Parkinson’s. Each chapter details a separate challenge in design and implementation. Addressing topics ranging from sensor hardware and the demand for higher data bandwidth to portability and cost, the book highlights the key areas that require further research for HSNs to become a technological and commercially viable reality.