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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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Related in: MedlinePlus

Voltage variations on reader coil versus distance. Transmission medium between coils: air. Measurements were done for various frequencies (1 MHz, 10 MHz, 100 MHz, 250 MHz, and 500 MHz).
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fig12: Voltage variations on reader coil versus distance. Transmission medium between coils: air. Measurements were done for various frequencies (1 MHz, 10 MHz, 100 MHz, 250 MHz, and 500 MHz).

Mentions: Besides the chosen frequency of 10 MHz and maintaining air as the transmission medium, coupling between the implant and the external reader at various frequencies was measured as seen in Figure 12. As before, a sweep was made by changing the distance between coils, starting at 20 mm and ending at 1 mm for 500 MHz, 250 MHz, 100 MHz, and 1 MHz. As expected due to the tank circuit from both the external reader and the implant, no coupling between coils was observed at frequencies different from 10 MHz.


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)

Voltage variations on reader coil versus distance. Transmission medium between coils: air. Measurements were done for various frequencies (1 MHz, 10 MHz, 100 MHz, 250 MHz, and 500 MHz).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

fig12: Voltage variations on reader coil versus distance. Transmission medium between coils: air. Measurements were done for various frequencies (1 MHz, 10 MHz, 100 MHz, 250 MHz, and 500 MHz).
Mentions: Besides the chosen frequency of 10 MHz and maintaining air as the transmission medium, coupling between the implant and the external reader at various frequencies was measured as seen in Figure 12. As before, a sweep was made by changing the distance between coils, starting at 20 mm and ending at 1 mm for 500 MHz, 250 MHz, 100 MHz, and 1 MHz. As expected due to the tank circuit from both the external reader and the implant, no coupling between coils was observed at frequencies different from 10 MHz.

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