Introduction In the previous study,we proved that modified cap-assisted endoscopic mucosal resection(mEMR-C)is non-inferior to endoscopic submucosal dissection for rectal neuroendocrine tumors(NETs)smaller than 10 mm ...Introduction In the previous study,we proved that modified cap-assisted endoscopic mucosal resection(mEMR-C)is non-inferior to endoscopic submucosal dissection for rectal neuroendocrine tumors(NETs)smaller than 10 mm with a similar complete resection rate but shorter procedure time and lower hospitalization costs[1].However,a snare needs to be precisely placed into the inner groove of the cap during the mEMR-C procedure,which is timeconsuming and difficult for inexperienced doctors.展开更多
A wearable microgrid that centralizes and distributes harvested energy across different body regions can optimize power utilization and reduce overall battery weight.This setup underscores the importance of developing...A wearable microgrid that centralizes and distributes harvested energy across different body regions can optimize power utilization and reduce overall battery weight.This setup underscores the importance of developing cable-free wireless power transfer(WPT)systems for mobile and portable devices to eliminate the risks posed by wired connections,especially in dynamic and hazardous environments.We introduce a thin,stretchable,and safe hand band capable of watt-level wireless charging through the widely adopted Qi protocol operating at 130 kHz.The implementation of nonadhesive fabric encapsulation serves to protect the 50-μm-thin spiral copper antenna from mechanical strain,ensuring an overall hand band stretchability of 50%.We also create a stretchable“Ferrofabric”,characterized by a magnetic permeability of 11.3 and a tensile modulus of 75.3 kPa,that provides magnetic shielding for the antenna without compromising wearability.The“Ferrofabric”improves the coil inductance but induces core loss in AC application.By fully understanding and managing loss mechanisms such as the skin effect,proximity effect,core loss,and joule heating,we achieve a wireless charging efficiency of71%andpower delivery of 3.81Win the kHz frequency range.OurWPThand band is unobstructive to hand motion and can charge a handheld smartphone as fast as a desktop charger or power a battery-free chest-laminated e-tattoo sensor,with well-managed thermal and electromagnetic safety.Through a holistic electromagnetic,structural,and thermal design,our device culminates in a safe,rugged,and versatile solution for wearable WPT systems.展开更多
基金supported by Guangzhou Science and Technology Plan Project[grant number 2023A04J2286].
文摘Introduction In the previous study,we proved that modified cap-assisted endoscopic mucosal resection(mEMR-C)is non-inferior to endoscopic submucosal dissection for rectal neuroendocrine tumors(NETs)smaller than 10 mm with a similar complete resection rate but shorter procedure time and lower hospitalization costs[1].However,a snare needs to be precisely placed into the inner groove of the cap during the mEMR-C procedure,which is timeconsuming and difficult for inexperienced doctors.
基金support from the U.S.Army Research Laboratory(ARL)under Corporative Agreement W911NF-19-2-0036 and the U.S.Army Research Office(ARO)under Cooperative Agreement W911NF-19-2-0333.
文摘A wearable microgrid that centralizes and distributes harvested energy across different body regions can optimize power utilization and reduce overall battery weight.This setup underscores the importance of developing cable-free wireless power transfer(WPT)systems for mobile and portable devices to eliminate the risks posed by wired connections,especially in dynamic and hazardous environments.We introduce a thin,stretchable,and safe hand band capable of watt-level wireless charging through the widely adopted Qi protocol operating at 130 kHz.The implementation of nonadhesive fabric encapsulation serves to protect the 50-μm-thin spiral copper antenna from mechanical strain,ensuring an overall hand band stretchability of 50%.We also create a stretchable“Ferrofabric”,characterized by a magnetic permeability of 11.3 and a tensile modulus of 75.3 kPa,that provides magnetic shielding for the antenna without compromising wearability.The“Ferrofabric”improves the coil inductance but induces core loss in AC application.By fully understanding and managing loss mechanisms such as the skin effect,proximity effect,core loss,and joule heating,we achieve a wireless charging efficiency of71%andpower delivery of 3.81Win the kHz frequency range.OurWPThand band is unobstructive to hand motion and can charge a handheld smartphone as fast as a desktop charger or power a battery-free chest-laminated e-tattoo sensor,with well-managed thermal and electromagnetic safety.Through a holistic electromagnetic,structural,and thermal design,our device culminates in a safe,rugged,and versatile solution for wearable WPT systems.
