title: Study of the effect of distance and misalignment between magnetically coupled coils for wireless power transfer in intraocular pressure measurement.
abstract: An analysis of the effect of distance and alignment between two magnetically coupled coils for wireless power transfer in intraocular pressure measurement is presented. For measurement purposes, a system was fabricated consisting of an external device, which is a Maxwell-Wien bridge circuit variation, in charge of transferring energy to a biomedical implant and reading data from it. The biomedical implant is an RLC tank circuit, encapsulated by a polyimide coating. Power transfer was done by magnetic induction coupling method, by placing one of the inductors of the Maxwell-Wien bridge circuit and the inductor of the implant in close proximity. The Maxwell-Wien bridge circuit was biased with a 10 MHz sinusoidal signal. The analysis presented in this paper proves that wireless transmission of power for intraocular pressure measurement is feasible with the measurement system proposed. In order to have a proper inductive coupling link, special care must be taken when placing the two coils in proximity to avoid misalignment between them.
authors.affiliation: Graduate Department, National Polytechnic Institute of Mexico (IPN), ESIME UPC, Avenida Santa Ana 1000, San Francisco Culhuacan, 04260 Mexico City, DF, Mexico.
authors.forename: Adrian E
authors.initials: AE
authors.lastname: Rendon-Nava
authors.affiliation: Electronics Department, INAOE, Luis Erro 1, 72840 Santa Maria Tonantzintla, PUE, Mexico.
authors.forename: J Alejandro
authors.initials: JA
authors.lastname: Díaz-Méndez
authors.affiliation: Graduate Department, National Polytechnic Institute of Mexico (IPN), ESIME UPC, Avenida Santa Ana 1000, San Francisco Culhuacan, 04260 Mexico City, DF, Mexico.
authors.forename: Luis
authors.initials: L
authors.lastname: Nino-de-Rivera
authors.affiliation: Electronics Department, INAOE, Luis Erro 1, 72840 Santa Maria Tonantzintla, PUE, Mexico.
authors.forename: Wilfrido
authors.initials: W
authors.lastname: Calleja-Arriaga
authors.affiliation: APEC, The Association to Avoid Blindness in Mexico, Hospital Luis Sanchez Bulnes, Vicente Garcia Torres 46, 04030 Coyoacan, DF, Mexico.
authors.forename: Felix
authors.initials: F
authors.lastname: Gil-Carrasco
authors.affiliation: Electronics Department, INAOE, Luis Erro 1, 72840 Santa Maria Tonantzintla, PUE, Mexico.
authors.forename: Daniela
authors.initials: D
authors.lastname: Díaz-Alonso
mesh_terms: D014065:Tonometry, Ocular / Q000295:instrumentation / Q000379:methods*; D059015:Wireless Technology / Q000295:instrumentation*
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