| In recent years,flexible electronic devices for medical and health are one of the important development directions of wearable electronic devices.Flexible electronic devices have subverted the rigid physical form of traditional electronic devices,breaking through the bottleneck that traditional rigid electronic devices cannot be conformally integrated with human flexible tissues,and have irreplaceable advantages in the fields of medical health and life science research.Wearable flexible electronic devices can fit seamlessly with the human body naturally,and maintain excellent stability and robustness under strain conditions.As physiological signal sensors or bionic actuators,the way of human-computer interaction has been changed,which plays an increasingly important role in the field.However,almost all wearable electronic devices rely on certain power source.Traditional batteries are still limited by large dimensions and short life cycle,while emerging bioenergy harvesting systems for implantable devices has the disadvantages of being difficult to provide stable,sustainable energy,and low energy density.Wireless energy supply technology can achieve a certain distance wireless energy transmission between the transmitter and the receiver through electromagnetic induction,and has attracted widespread attention because of its safety and reliability.However,problems such as large area,low elongation rate,and low transmission efficiency are still the main constraints for its popularization and application.Therefore,the development of miniaturized,flexible and extensible energy supply systems with high conversion efficiency and excellent robust performance will greatly expand the application fields of flexible electronic devices and play a key role in the next generation of intelligent health and medical systems.In this thesis,a flexible bioelectronic device with extensibility,small size and excellent wireless power transfer performance was designed and fabricated.The system adopts the resonant coupling near-field wireless transmission method,and proposes a double-layer serpentine coil structure,which balances the relationship between power transmission performance and tensile properties,within a limited area.The experimental results show that the resonant coupling transmission method has higher transmission efficiency than the inductive coupling transmission method.Compared with the singlelayer coil,the area of the double-layer serpentine coil is reduced by 55%,the tensile performance is improved by 40%,and it has a higher coupling coefficient with the transmitting coil.By systematically study of the coupling mechanism on elastic strain and physical properties,the correlation mechanism between macroscopic deformation,microscopic strain,physical properties,and power transfer properties was established.Based on the optimized wireless transmission design,the device verification was carried out by taking the lung inflammation model as an example.The results showed that the implantable device could work stably within the 12-day test period,and the electrical stimulation of the Zusanli acupoint could regulate the inflammatory response and alleviate the pulmonary inflammatory symptoms to a certain extent. |
