A study, led by associate professor Weihua Chen, combined the mu-negative metamaterial units and mu-near-zero metamaterial units to construct a hybrid metamaterial slab suitable for the cardiac pacemaker MCR-WPT system.
The MCR-WPT system containing the proposed metamaterial slab was shown to have an efficiency enhancing performance reaching 62.39% at 20 mm transmission distance, which is not inferior to single negative permeability metamaterial slab. The proposed metamaterial also showed superior magnetic leakage shielding performance in finite element simulations.
The study is published in the journal CES Transactions on Electrical Machines and Systems.
In clinical applications, implanted medical devices requiring electrical power, including implanted cardiac pacemakers, face shortcomings like short battery lifespan and wires penetrating patients’ skin.
Further problems including frequent surgery for battery changing and infections caused by the wire limits the clinical use of IMDs. MCR-WPT technology can help to avoid these problems, but the wireless powering itself faces flaws including low transmission efficiency and serious magnetic field leakage.
The findings of this research show advantages, including easy manufacturing, low cost and no topology change of the WPT system, providing a metamaterial-based efficiency improving method which also takes magnetic leakage shielding into account for radio-frequency IMD MCR-WPT systems.
Looking ahead, the LNTU research team plans to refine their design by more accurate experiments including animal in vivo powering test, introducing tunable capacitors to the metamaterial units to enhance the anti-misalignment ability of the metamaterial slab and applying the proposed metamaterial structure to MCR-WPT systems with higher order topologies.
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Schematics of the MCR-WPT system based on the MNG-MNZ metamaterial matrix. (a) Schematic of WPT system structure. (b) Schematic of the shielding and concentration effect on magnetic field. Credit: CES Transactions on Electrical Machines and Systems
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Relative permeability curves of MNG and MNZ metamaterials. By tuning the frequency of the units, the metamaterial can show nearly all permeabilities at determined frequency. Credit: CES Transactions on Electrical Machines and Systems
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To verify the temperature rise during operation of the MCR-WPT system based on MNG-MNZ metamaterial, we conducted 2 sets of temperature rise experiments on the MCR-WPT system with MNG-MNZ metamaterial and one set of experiment without metamaterial at room temperature of 22°C. Temperature data were collected by STM32 one-chip computer once per second. The temperature results of different sets of temperature rise experiments are as shown. Credit: CES Transactions on Electrical Machines and Systems
More information:
Weihua Chen et al, Wireless Power Supply Based on MNG-MNZ Metamaterial for Cardiac Pacemakers, CES Transactions on Electrical Machines and Systems (2024). DOI: 10.30941/CESTEMS.2024.00011
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CES Transactions on Electrical Machines and Systems
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Researchers enhance cardiac pacemaker efficiency with hybrid metamaterial (2024, June 24)
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