Noninvasive method to drive medical micro-robots

A noninvasive method to drive medical micro-robots into endocoeles has been proposed and a kind of medical micro robot driven by the method has been d esigned. The robot has a spirally grooved impeller. When the spirally groov ed impeller rotates, a hydrodynamic film between the robot and endocoeles i s formed because of mucus existence in endocoeles. The generated axial thru st force of the impeller can drive robots to move. Because the hydrodynamic film is formed when the robot moves in endocoeles, injury may be prevented , so ii can alleviate or avoid pain of sufferers. The generated axial thrus t force of the impeller ha's been estimated according to the hydrodynamic l ubrication theory and has been confirmed by experiments.