Modeling and Characterization of Capacitive Elements With Tissue as Dielectric Material for Wireless Powering of Neural Implants

@article{Erfani2018ModelingAC,
  title={Modeling and Characterization of Capacitive Elements With Tissue as Dielectric Material for Wireless Powering of Neural Implants},
  author={Reza Erfani and Fatemeh Marefat and Amir Masoud Sodagar and Pedram Mohseni},
  journal={IEEE Transactions on Neural Systems and Rehabilitation Engineering},
  year={2018},
  volume={26},
  pages={1093-1099}
}
This paper reports on the modeling and characterization of capacitive elements with tissue as the dielectric material, representing the core building block of a capacitive link for wireless power transfer to neural implants. Each capacitive element consists of two parallel plates that are aligned around the tissue layer and incorporate a grounded, guarded, capacitive pad to mitigate the adverse effect of stray capacitances and shield the plates from external interfering electric fields. The… 
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References

SHOWING 1-10 OF 41 REFERENCES
Modeling and Experimental Validation of a Capacitive Link for Wireless Power Transfer to Biomedical Implants
TLDR
The modeling and experimental validation of a capacitive link as an emerging strategy for wireless power transfer to biomedical implants and in very good agreement with simulation results from the related circuit model is reported.
Transcutaneous capacitive wireless power transfer (C-WPT) for biomedical implants
TLDR
A transcutaneous capacitive wireless power transfer strategy for biomedical implants based upon a series resonant converter in which the tank capacitors are replaced with a capacitive link comprising two pairs of coated parallel plates aligned around the tissue as the dielectric material is reported on.
Wireless Power Delivery to Flexible Subcutaneous Implants Using Capacitive Coupling
TLDR
The studies validate the NCC method as a safe wireless powering scheme, which can be used as an alternative to the near-field resonant inductive coupling method, for chronic use in subcutaneous implants.
Modeling of a capacitive link for data telemetry to biomedical implants
This paper presents modeling of a capacitive link for wireless data transfer to implantable biomedical microsystems. Based on the proposed model, voltage transfer ratio of the link is calculated, and
Wireless Power Transfer Strategies for Implantable Bioelectronics
TLDR
This review presents the theory, link design, and challenges, along with their probable solutions for the traditional near-field resonant inductively coupled WPT, capacitively coupled short-ranged W PT, and more recently developed ultrasonic, mid-field, and far-field coupled W PT technologies for implantable applications.
A Biosafety Comparison Between Capacitive and Inductive Coupling in Biomedical Implants
This letter investigates the link efficiencies and ensuing biohazards when capacitive versus inductive coupling is used to power biomedical implants electromagnetically. Electromagnetic simulations
Capacitive power transfer for contactless charging
The simplicity and low cost of capacitive interfaces makes them very attractive for wireless charging stations. Major benefits include low electromagnetic radiation and the amenability of combined
A Hybrid Inductive-Ultrasonic Link for Wireless Power Transmission to Millimeter-Sized Biomedical Implants
  • Miao Meng, M. Kiani
  • Computer Science
    IEEE Transactions on Circuits and Systems II: Express Briefs
  • 2017
TLDR
A hybrid inductive-ultrasonic WPT link for powering mm-sized implants that utilizes two cascaded co-optimized inductive and ultrasonic links for WPT through bone/air and tissue, respectively is presented.
A Wireless Implantable Multichannel Microstimulating System-on-a-Chip With Modular Architecture
TLDR
A 64-site wireless current microstimulator chip (Interestim-2B) and a prototype implant based on the same chip have been developed for neural prosthetic applications, which has site potential measurement and in situ site impedance measurement capabilities, which help its users indicate defective sites or characteristic shifts in chronic stimulations.
Capacitive Power Transfer Through a Conformal Bumper for Electric Vehicle Charging
  • J. Dai, D. Ludois
  • Engineering
    IEEE Journal of Emerging and Selected Topics in Power Electronics
  • 2016
Wireless power transfer (WPT) is emerging as a practical means for electric vehicle (EV) charging. Of the most common approaches to WPT, inductive coupling, and capacitive coupling, capacitive power
...
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