NFC Powered Implantable Temperature Sensor

• Published in: 2019 41ST ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY (EMBC) Vol. 2019; pp. 4359 - 4362
• Main Authors: Kifle, Y., Wikner, JJ, Zotterman, J., Ryden, L., Farnebo, S.
• Format: Conference Proceeding Journal Article
• Language: English
• Published: United States IEEE 01.07.2019
• Series: IEEE Engineering in Medicine and Biology Society Conference Proceedings
• Subjects: Body Temperature; Humidity; Monitoring, Physiologic - instrumentation; Plastics; Prostheses and Implants; Substrates; Temperature control; Temperature distribution; Temperature measurement; Temperature sensors
• DOI: 10.1109/EMBC.2019.8856607
• ISBN: 9781538613115; 1538613123; 1538613115; 9781538613122
• ISSN: 1557-170X

Inductively powered 99% accurate implantable temperature sensor is designed, characterized and the findings are presented in this paper. The implantable sensors deliver a continuous temperature reading to external storage or readout devices via Near Field Communication interface. A 2.76μH rectangular inductive coil printed on a thin biocompatible plastic substrate is designed to establish the coupling link through NFC interface with external readout devices. A commercially available wide range temperature sensor chip is mounted along with the developed inductive coil on the same plastic substrate. For 50 samples, the received signal strength indicator, temperature accuracy and statistical distribution of measurement levels is investigated. Comparison of predetermined temperature in a controlled temperature and humidity chamber versus the temperature reading from the developed sensors proves a 99% accuracy.