A closed-loop inductive power control system for an instrumented strain sensing tibial implant

Author

Shiying Hao ; Taylor, Stephen

Author_Institution

Sch. of Med., Stanford Univ., Stanford, CA, USA

fYear

2014

fDate

26-30 Aug. 2014

Firstpage

6553

Lastpage

6556

Abstract

Inductively-powered implantable biomedical devices are widely used nowadays, however the power variations due to the coil misalignment can significantly affect the device performance. A closed-loop power control system is proposed in this paper, which is implemented in a Subject-Carried Implant Monitoring Inductive Telemetric Ambulatory Reader (SCIMITAR) for remote strain data acquisition from an instrumented ovine tibia implant. The output power of the energizer is adaptively adjusted via a feedback circuitry connected the demodulator with the power energizer. Lab results showed that feedback suppressed variations in induced power caused by coil misalignment and extended the functional range of the device in axial and planar directions.

Keywords

biomedical equipment; biomedical measurement; biomedical telemetry; circuit feedback; closed loop systems; coils; data acquisition; demodulators; power control; prosthetic power supplies; strain sensors; Inductively-powered implantable biomedical devices; axial directions; closed-loop inductive power control system; coil misalignment; demodulator; device performance; feedback circuitry; feedback suppressed variations; instrumented strain sensing tibial implant; output power; planar directions; power energizer; power variations; remote strain data acquisition; subject-carried implant monitoring inductive telemetric ambulatory reader; Coils; Demodulation; Implants; Instruments; Nails; Strain; Telemetry;

fLanguage

English

Publisher

ieee

Conference_Titel

Engineering in Medicine and Biology Society (EMBC), 2014 36th Annual International Conference of the IEEE

Conference_Location

Chicago, IL

ISSN

1557-170X

Type

conf

DOI

10.1109/EMBC.2014.6945129

Filename

6945129