MilliDelta robot surgeon is the size of a one cent coin
 

Another tiny robot is gearing up to join the ranks of microsurgeons, but this one is small enough to fit in your coin purse. Inspired by pop-up books and origami, the milliDelta bot measures mere millimetres when unfolded (roughly the size of a one c...

https://www.engadget.com/2018/01/22/...micro-surgery/