Title :
A telemetry system for measurement of forces in massive orthopaedic implants in vivo
Author_Institution :
Dept. of Biomed. Eng., Univ. Coll. London, UK
fDate :
31 Oct-3 Nov 1996
Abstract :
A wireless telemetry system is described for measurement of forces acting upon massive orthopaedic implants in man, to determine the load distribution in the fixation during routine activities and over long periods. The system comprises: the permanently implanted instrumented prosthesis, modified to enclose strain gauges and electronics, a single inductive link for powering the implant and telemetering the data, a UHF radio link, and real time data logging PC. The subject carries a small battery-powered energiser and microcontroller during measurements. Four instrumented prostheses have been implanted, and data recorded over several years. Hermetic sealing for the gauges and implanted instrumentation, and careful coil encapsulation techniques, have enabled data to be recorded over several years
Keywords :
biomechanics; biomedical telemetry; bone; computerised monitoring; force measurement; medical diagnostic computing; patient monitoring; prosthetics; radio links; strain measurement; UHF radio link; coil encapsulation; electronics; fixation; hermetic sealing; implant powering; in vivo force measurement; load distribution; long periods; massive orthopaedic implants; microcontroller; permanently implanted instrumented prosthesis; real time data logging PC; routine activities; single inductive link; small battery-powered energiser; strain gauges; wireless telemetry system; Force measurement; Implants; Instruments; Microcontrollers; Orthopedic surgery; Prosthetics; Radio link; Real time systems; Strain measurement; Telemetry;
Conference_Titel :
Engineering in Medicine and Biology Society, 1996. Bridging Disciplines for Biomedicine. Proceedings of the 18th Annual International Conference of the IEEE
Conference_Location :
Amsterdam
Print_ISBN :
0-7803-3811-1
DOI :
10.1109/IEMBS.1996.656958
