Numerical Simulations on Injury to Human Intestinal Walls Produced by Spiral Micro-robots

摘要

A non-invasive spiral intestinal micro-robot was introduced.When it drove in the human intestine,dynamic control equations of intestinal fluid were established.By computational fluid dynamics method,the relations between different robotic rotating speeds,intestine fluid densities,intestine fluid dynamic viscosities,robotic diameters and impact pressures of human intestinal wall produced by the micro-robot were calculated and analyzed in the circumstances of cylindrical forward and reverse rotation.It was obtained that when the robotic rotating speed,intestinal fluid density,intestinal fluid dynamic viscosity,robotic diameter were increased,the impact pressures of human intestinal wall produced by the running micro-robot were basically enlarged,and the most influence factor was the robotic diameter,and the least influence factor was the intestinal fluid density.The impact pressures of human intestinal wall produced by the micro-robot could be endured by people.While the influence of distorting extent of intestine on impact pressures of human intestinal wall produced by the micro-robot was not large.The above theoretical analysis results provide an essential theoretical basis for the high-speed rotating spiral medical micro-robot really applied to non-invasive or mini-invasive surgery of human intestine.