Wireless induction coils embedded in diamond for power transfer in medical implants

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dc.contributor.authorSikder, Kabir
dc.contributor.authorFallon, James
dc.contributor.authorShivdasani, Mohit
dc.contributor.authorGanesan, Kumaravelu
dc.contributor.authorSeligman, Peter
dc.contributor.authorGarrett, David
dc.date.accessioned2018-08-01T04:05:39Z
dc.date.available2018-08-01T04:05:39Z
dc.date.issued2017-08
dc.description.abstractWireless power and data transfer to medical implants is a research area where improvements in current state-of-the-art technologies are needed owing to the continuing efforts for miniaturization. At present, lithographical patterning of evaporated metals is widely used for miniature coil fabrication. This method produces coils that are limited to low micron or nanometer thicknesses leading to high impedance values and thus limiting their potential quality. In the present work we describe a novel technique, whereby trenches were milled into a diamond substrate and filled with silver active braze alloy, enabling the manufacture of small, high cross-section, low impedance microcoils capable of transferring up to 10 mW of power up to a distance of 6 mm. As a substitute for a metallic braze line used for hermetic sealing, a continuous metal loop when placed parallel and close to the coil surface reduced power transfer efficiency by 43%, but not significantly, when placed perpendicular to the microcoil surface. Encapsulation of the coil by growth of a further layer of diamond reduced the quality factor by an average of 38%, which can be largely avoided by prior oxygen plasma treatment. Furthermore, an accelerated ageing test after encapsulation showed that these coils are long lasting. Our results thus collectively highlight the feasibility of fabricating a high-cross section, biocompatible and long lasting miniaturized microcoil that could be used in either a neural recording or neuromuscular stimulation device.en_US
dc.description.sponsorshipThis research and KS were supported by an Australian Research Council (ARC) DECRA grant DE130100922. DJG is supported by the National Health and Medical Research Council (NHMRC) of Australia, grant GNT1101717. MNS is supported by the National Health and Medical Research Council (NHMRC) of Australia, grant GNT1063093. The Bionics Institute acknowledges the support received from the Victorian Government through its Operational Infrastructure Program for this work.en_US
dc.identifier.citationSikder, M. K. U., J. Fallon, M. N. Shivdasani, K. Ganesan, P. Seligman, and D. J. Garrett. 2017. Wireless induction coils embedded in diamond for power transfer in medical implants. Biomedical microdevices. 19(4): 79.en_US
dc.identifier.issn1387-2176
dc.identifier.urihttp://repository.bionicsinstitute.org:8080/handle/123456789/310
dc.language.isoenen_US
dc.publisherSpringeren_US
dc.subjectMedical implanten_US
dc.subjectWireless poweren_US
dc.subjectDiamonden_US
dc.subjectBrazeen_US
dc.subjectSilver ABAen_US
dc.subjectInduction coilen_US
dc.titleWireless induction coils embedded in diamond for power transfer in medical implantsen_US
dc.typeArticleen_US
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