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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: 1 mm of pork skin and 1 mm of fat.
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fig13: Voltage variations on reader coil versus distance. Transmission medium between coils: 1 mm of pork skin and 1 mm of fat.

Mentions: In addition to the measurements mentioned above, measurements were made with two different transmission mediums. Mutual magnetic coupling between coils was measured by placing pork skin on top of the Maxwell-Wien bridge circuit. The skin consisted of 2 mm of skin and fat. The distance between coils was swept from 20 mm to 4 mm. The results depicted in Figure 13 show a larger variation in voltage when compared with air. Comparing these results with solely air as the transmission medium, this means that for a greater distance between coils, there still exists an influence in the reader coil due to the implant coil. In other words, magnetic coupling between coils was found to be better when the transmission medium included organic tissue.


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: 1 mm of pork skin and 1 mm of fat.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

fig13: Voltage variations on reader coil versus distance. Transmission medium between coils: 1 mm of pork skin and 1 mm of fat.
Mentions: In addition to the measurements mentioned above, measurements were made with two different transmission mediums. Mutual magnetic coupling between coils was measured by placing pork skin on top of the Maxwell-Wien bridge circuit. The skin consisted of 2 mm of skin and fat. The distance between coils was swept from 20 mm to 4 mm. The results depicted in Figure 13 show a larger variation in voltage when compared with air. Comparing these results with solely air as the transmission medium, this means that for a greater distance between coils, there still exists an influence in the reader coil due to the implant coil. In other words, magnetic coupling between coils was found to be better when the transmission medium included organic tissue.

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