SCIMITAR: subject-carried implant monitoring inductive telemetric ambulatory reader for remote data acquisition from implanted orthopaedic prostheses.
This work describes the functions of the external, portable part of a telemetry system for powering and interrogating implantable electrical devices built within orthopaedic implants for real-time data acquisition of strain, load, temperature, humidity and other relevant data (e.g. from inertial sensors). The system contains a battery powered inductive energiser and demodulator to remotely power the implant electronics and demodulate the signals transmitted from the implanted device. Due to the housing of the internal coil, sufficient inductive coupling is obtained between the external and internal tuned circuits to enable simultaneous power and data transmission over the same inductive link. The actual performance of this system when used with one specific implant was studied, and some correspondence made to the relevant theory. Performance factors relating to both power efficiency and data reconstruction were identified.
Centre for Biomedical Engineering, University College London, UK. Electronic address: zxrlwj@gmail.com.
Shiying
S
Hao
The College of Industrial Engineering, Madrid, Spain.
Jose
J
Gorjon
Centre for Biomedical Engineering, University College London, UK.
Stephen
S
Taylor
D004560:Electricity; D006801:Humans; D009985:Orthopedics; D019736:Prostheses and Implants; D013686:Telemetry / Q000295:instrumentation*; D013977:Tibia
Data acquisition; Inductive coil; Instrumented implant; Strain; Telemetry