title: Powering implantable telemetry devices from localized magnetic fields.
abstract: This paper presents a novel method of inductively powering an implantable telemetry device over a large area. The system is based around an array of individually tuned series resonant circuits distributed across a charging pad. By varying the frequency of the driving voltage, the location of the charging field is changed. Presented are a method of controlling the resonant frequency and techniques for determining the geometry of the charging pad. Results from a nine coil system operating between 97 kHz and 209 kHz are given which can deliver 100 mW to an implanted telemeter at a height of 5cm above the charging pad.
authors.affiliation: Bioengineering Institute, The University of Auckland, New Zealand. d.mccormick@auckland.ac.nz
authors.forename: Daniel
authors.initials: D
authors.lastname: McCormick
authors.forename: Aiguo Patrick
authors.initials: AP
authors.lastname: Hu
authors.forename: Poul
authors.initials: P
authors.lastname: Nielsen
authors.forename: Simon
authors.initials: S
authors.lastname: Malpas
authors.forename: David
authors.initials: D
authors.lastname: Budgett
mesh_terms: D000465:Algorithms; D000818:Animals; D003201:Computers; D011211:Electric Power Supplies; D004567:Electrodes, Implanted; D004574:Electromagnetic Fields; D004867:Equipment Design; D006801:Humans; D008280:Magnetics; D051379:Mice; D015233:Models, Statistical; D018670:Monitoring, Ambulatory / Q000295:instrumentation* / Q000379:methods; D019736:Prostheses and Implants; D015203:Reproducibility of Results; D013686:Telemetry / Q000295:instrumentation* / Q000379:methods