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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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Passive RLC tank circuit with polyimide coating.
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fig9: Passive RLC tank circuit with polyimide coating.

Mentions: To improve the quality factor of the implant coil and its response at the 10 MHz range, polyimide was removed from the ends of the coil to solder a surface mount capacitor of 2.7 nF, as shown in Figure 9. The implant coil was designed to have an inner radius of 1.2 mm, conductor width of 0.5 mm, spacing between turns of 0.9 mm, and a number of turns equal to 4. The total diameter of the coil used was 12 mm.


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)

Passive RLC tank circuit with polyimide coating.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

fig9: Passive RLC tank circuit with polyimide coating.
Mentions: To improve the quality factor of the implant coil and its response at the 10 MHz range, polyimide was removed from the ends of the coil to solder a surface mount capacitor of 2.7 nF, as shown in Figure 9. The implant coil was designed to have an inner radius of 1.2 mm, conductor width of 0.5 mm, spacing between turns of 0.9 mm, and a number of turns equal to 4. The total diameter of the coil used was 12 mm.

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