Methods for Compensation of Coil Misalignment in Systems for Inductive Transcutaneous Power Transfer to Implanted Medical Devices

Данилов, А. А.; Mindubaev, E. A.; Селищев, С. В.

doi:10.1007/s10527-017-9684-9

Cited by 18 publications

(8 citation statements)

References 35 publications

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“…Nevertheless, it can be said that the simple choice between ''large'' and ''small'' values should be done at first. It is possible to estimate these ranges on the basis of achievable values of L T , L R and predefined value of f o using (20), (21). In general, values of the order of 10 nF and higher can be considered ''large'', and values of about 1 nF and lesser can be considered as ''small''.…”

Section: Mid-power/mid-frequency Casementioning

confidence: 99%

“…implants [15], [16]. In addition, inductive powering of mechanical circulatory support systems is of special interest [17]- [20].…”

Section: Introductionmentioning

confidence: 99%

“…It can be said that inductive coils misalignments are one of the main restraints to wider implementation of IMDs wireless powering [3], [20], [21]. Changes in the tissue state and the patient activity can cause such misalignments, which, in its own turn, cause changes in the inductive powering unit (IPU) output characteristics [18], [20], [22]. At the same time, reliability and stability are one of the fundamental requirements for medical devices.…”

Section: Introductionmentioning

confidence: 99%

“…At the same time, reliability and stability are one of the fundamental requirements for medical devices. Thus, significant efforts are dedicated to overcome the problem of the coils misalignment [20].…”

Section: Introductionmentioning

confidence: 99%

“…The external coil is placed on top of the bulge, and adhesives can be used for fixation. This method is quite popular, but it has a serious drawback, because the shape of the external coil is greatly affected and it compromises the overall performance of the inductive link [20].…”

Section: Introductionmentioning

confidence: 99%

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An Algorithm for the Computer Aided Design of Coil Couple for a Misalignment Tolerant Biomedical Inductive Powering Unit

et al. 2019

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Coils misalignments restrain the wider implementation of inductive powering of implantable medical devices. The misalignment problem can be overcome with the help of the coils geometry optimization. Coil couple design implies simultaneous adjustment of the several parameters (coils radii, turns numbers, and pitch). Thus, it is desirable to have the means for computer-aided design of the system. An algorithm for the coil couple design is devised. The key feature of the algorithm is the use of predefined maximum and minimum acceptable values of the load power as a performance metric. The algorithm gives the geometry of the coil which ensures that the inductive powering unit provides the given range of the load power for the given range of the misalignments. A formal method is proposed for the calculation of the initial coils characteristics and consequent adjustment of the transmitting coil external radius, transmitting coil turns number, coils internal radii (simultaneously), and receiving coil turns number. The software implementing the proposed algorithm was developed. Eight design runs were performed in order to evaluate the algorithm performance in various conditions, including different power ranges (10 W, 100 mW, and 300 µW), operating frequencies (0.2 MHz, 1 MHz, 6.78 MHz, and 13.56 MHz), and possible implementations (ventricular assist devices, cochlear implants, and spinal cord stimulators). It was proved that the power drop as low as 10% of the mean load power can be ensured for the lateral misalignments up to the receiving coil external radius. The low-power inductive powering unit was constructed and tested. The experimental results confirm the numerical modeling. INDEX TERMS Electromagnetic coupling, inductive charging, inductive power transmission, implants.

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Section: Mid-power/mid-frequency Casementioning

confidence: 99%

“…implants [15], [16]. In addition, inductive powering of mechanical circulatory support systems is of special interest [17]- [20].…”

Section: Introductionmentioning

confidence: 99%