Influence of Angular Coil Displacements on Effectiveness of Wireless Transcutaneous Inductive Energy Transmission

Данилов, А. А.; Mindubaev, E. A.

doi:10.1007/s10527-015-9523-9

Cited by 12 publications

(5 citation statements)

References 10 publications

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“…Changes in the separation distance and alignment of antennas can cause variations in coupling and power transfer [ 95 ]. One strategy to compensate involves regulating input power at the transmitter.…”

Section: Implementations Of Adaptive Transcutaneous Systemsmentioning

confidence: 99%

Adaptive Transcutaneous Power Transfer to Implantable Devices: A State of the Art Review

Bocan

Sejdić

2016

Sensors

106

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Wireless energy transfer is a broad research area that has recently become applicable to implantable medical devices. Wireless powering of and communication with implanted devices is possible through wireless transcutaneous energy transfer. However, designing wireless transcutaneous systems is complicated due to the variability of the environment. The focus of this review is on strategies to sense and adapt to environmental variations in wireless transcutaneous systems. Adaptive systems provide the ability to maintain performance in the face of both unpredictability (variation from expected parameters) and variability (changes over time). Current strategies in adaptive (or tunable) systems include sensing relevant metrics to evaluate the function of the system in its environment and adjusting control parameters according to sensed values through the use of tunable components. Some challenges of applying adaptive designs to implantable devices are challenges common to all implantable devices, including size and power reduction on the implant, efficiency of power transfer and safety related to energy absorption in tissue. Challenges specifically associated with adaptation include choosing relevant and accessible parameters to sense and adjust, minimizing the tuning time and complexity of control, utilizing feedback from the implanted device and coordinating adaptation at the transmitter and receiver.

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Section: Implementations Of Adaptive Transcutaneous Systemsmentioning

confidence: 99%

Adaptive Transcutaneous Power Transfer to Implantable Devices: A State of the Art Review

Bocan

Sejdić

2016

Sensors

106

View full text Add to dashboard Cite

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“…The challenge arises due to the dynamic changes in load at the receiver end during the charging process. Tissue hyperplasia was found in the abdomen of the experimental pigs, resulting in irregular longitudinal and angular misalignment between the transmitting and receiving coils. Attitude changes can also impact misalignment, leading to power fluctuations at the receiver end 15,16 Due to the instability of the receiving power, the temperature of the porcine's abdomen at the energy‐receiving site has reached 50°C, which falls below the thermal safety standard. …”

Section: Introductionmentioning

confidence: 99%

“…Attitude changes can also impact misalignment, leading to power fluctuations at the receiver end. 15,16 3. Due to the instability of the receiving power, the temperature of the porcine's abdomen at the energy-receiving site has reached 50°C, which falls below the thermal safety standard.…”

mentioning

confidence: 99%

Robust voltage‐controlled transcutaneous energy transfer system for artificial anal sphincter

Chen,

Jiang,

Wang

et al. 2023

Artificial Organs

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BackgroundThe artificial anal sphincter (AAS) system has gained significant attention as a solution for treating fecal incontinence (FI). It relies on transcutaneous energy transfer (TET) as its primary energy source. However, changes in posture or biological tissue can cause misalignment of the coil, resulting in unstable power reception. Inadequate power affects charging efficiency, while excessive power leads to excessive heating at the receiver side. Consequently, achieving safe and constant voltage charging for the AAS becomes a complex challenge.MethodsTo maintain a consistent charging voltage and overcome the issue of variations in load and coil coupling strength, this article proposes a wireless charging control system that utilizes an LCC‐S‐type resonant network and phase shift to adjust the transmitting voltage based on feedback charging voltage in real time. In particular, the PI controller and neural network are introduced to change the phase‐shift angle swiftly. The dynamic performance is then evaluated under different misalignments and presented with comparative results.ResultsThe results indicate that the multilayer perceptron control system outperforms the PI. Under the complex misalignment disturbance, the average error of receiver side load voltage is only 0.007 V, with an average settling time of 960 ms. Additionally, the average temperature at the receiver side is 40.4°C.ConclusionThe experiments demonstrate that the proposed system effectively addresses the misalignment issue in TET during the charging, ensuring constant voltage charging at the receiver side and thermal safety.

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“…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%

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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Influence of Angular Coil Displacements on Effectiveness of Wireless Transcutaneous Inductive Energy Transmission

Cited by 12 publications

References 10 publications

Adaptive Transcutaneous Power Transfer to Implantable Devices: A State of the Art Review

Adaptive Transcutaneous Power Transfer to Implantable Devices: A State of the Art Review

Robust voltage‐controlled transcutaneous energy transfer system for artificial anal sphincter

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

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