Low invasive propulsion of medical devices by traction using mucus

This paper presents a new low invasive method to drive a medical device in an organic tube. The device has a spiral ribbed impeller which converts rotation to axial motion hydrodynamically using mucus. Generated thrust and drag were estimated according to linearized hydrodynamic lubrication theory. The optimum rib shape which makes thrust force maximum is predicted theoretically. As the proposed method of driving does not require direct contact against living tissue, injury may be prevented by keeping good lubrication conditions. Principles of designing a medical device are discussed such that reliable driving is compatible with low invasive operations.