Practical implementation of minimally invasive biomedical applications has been a long-sought goal for microrobots.In this field,most previous studies only demonstrate microrobots with locomotion ability or performing...Practical implementation of minimally invasive biomedical applications has been a long-sought goal for microrobots.In this field,most previous studies only demonstrate microrobots with locomotion ability or performing a single task,unable to be functionalized effectively.Here,we propose a biocompatible shape memory alloy helical microrobot with regulative structure transformation,making it possible to adjust its motion behavior and mechanical properties precisely.Especially,towards vascular occlusion problem,these microrobots reveal a fundamental solution strategy in the mechanical capability using shape memory effect.Such shape-transformable microrobots can not only manipulate thrust and torque by structure to enhance the unclogging efficiency as a microdriler but also utilize the high work energy to apply the expandable helical tail as a selfpropulsive stent.The strategy takes advantage of untethered manipulation to operate microsurgery without unnecessary damage.This study opens a route to functionalize microrobots via accurate tuning in structures,motions,and mechanical properties.展开更多
基金This work is supported by the National Natural Science Foundation of China(nos.51961145108,61975035,and 62005050)the Program of Shanghai Academic Research Leader(no.19XD1400600)+1 种基金Cui thanks the support from Shanghai Sailing Program(no.21YF1401600)the Science and Technology Commission of Shanghai Municipality(no.21ZR1403500).
文摘Practical implementation of minimally invasive biomedical applications has been a long-sought goal for microrobots.In this field,most previous studies only demonstrate microrobots with locomotion ability or performing a single task,unable to be functionalized effectively.Here,we propose a biocompatible shape memory alloy helical microrobot with regulative structure transformation,making it possible to adjust its motion behavior and mechanical properties precisely.Especially,towards vascular occlusion problem,these microrobots reveal a fundamental solution strategy in the mechanical capability using shape memory effect.Such shape-transformable microrobots can not only manipulate thrust and torque by structure to enhance the unclogging efficiency as a microdriler but also utilize the high work energy to apply the expandable helical tail as a selfpropulsive stent.The strategy takes advantage of untethered manipulation to operate microsurgery without unnecessary damage.This study opens a route to functionalize microrobots via accurate tuning in structures,motions,and mechanical properties.
