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Study of the effect of distance and misalignment between magnetically coupled coils for wireless power transfer in intraocular pressure measurement.

Rendon-Nava AE, Díaz-Méndez JA, Nino-de-Rivera L, Calleja-Arriaga W, Gil-Carrasco F, Díaz-Alonso D - ScientificWorldJournal (2014)

Bottom Line: 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.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.

View Article: PubMed Central - PubMed

Affiliation: Graduate Department, National Polytechnic Institute of Mexico (IPN), ESIME UPC, Avenida Santa Ana 1000, San Francisco Culhuacan, 04260 Mexico City, DF, Mexico.

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.

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Implant geometry and interconnection.
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fig7: Implant geometry and interconnection.

Mentions: Another reason to separate fabrication processes, not less important than the previous one, is because of practical purposes when surgically inserting the implant. The ultimate goal of this study is to develop an IOP sensor system capable of measuring pressure directly into the aqueous humor to avoid possible measurement errors caused by the hardness of the sclera which varies from patient to patient. For the implant to be able to measure IOP directly into the aqueous humor, the MEMS sensor will be located in a small appendix next to the coil which will be inserted into the eyeball so it can be in direct contact with the aqueous humor. The implant coil, however, will remain over the sclera, allowing it to have a better magnetic coupling with the reader coil. Figure 7 shows the geometry of the implant.


Study of the effect of distance and misalignment between magnetically coupled coils for wireless power transfer in intraocular pressure measurement.

Rendon-Nava AE, Díaz-Méndez JA, Nino-de-Rivera L, Calleja-Arriaga W, Gil-Carrasco F, Díaz-Alonso D - ScientificWorldJournal (2014)

Implant geometry and interconnection.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4109074&req=5

fig7: Implant geometry and interconnection.
Mentions: Another reason to separate fabrication processes, not less important than the previous one, is because of practical purposes when surgically inserting the implant. The ultimate goal of this study is to develop an IOP sensor system capable of measuring pressure directly into the aqueous humor to avoid possible measurement errors caused by the hardness of the sclera which varies from patient to patient. For the implant to be able to measure IOP directly into the aqueous humor, the MEMS sensor will be located in a small appendix next to the coil which will be inserted into the eyeball so it can be in direct contact with the aqueous humor. The implant coil, however, will remain over the sclera, allowing it to have a better magnetic coupling with the reader coil. Figure 7 shows the geometry of the implant.

Bottom Line: 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.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.

View Article: PubMed Central - PubMed

Affiliation: Graduate Department, National Polytechnic Institute of Mexico (IPN), ESIME UPC, Avenida Santa Ana 1000, San Francisco Culhuacan, 04260 Mexico City, DF, Mexico.

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.

Show MeSH
Related in: MedlinePlus