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This study proposes a stent motor as a medical device. A stent is a medical instrument inserted in a constricted part of a blood vessel to expand the blood vessel. However, the problem is that plaque accumulates around the installed stent and causes the blood vessel to narrow again. A stent motor is used to remove plaque. A stent motor consists of a receiver part to receive ultrasonic vibration and a stator part to drive the motor in the blood vessel. The purpose of this study was to develop a stent motor and determine its optimum design. It was possible to drive a stent motor by subjecting a disk-shaped receiver to strong ultrasonic vibrations. Experiments were performed on the stent motor with several types of receivers by changing their size and shape, and the efficiency was evaluated. Correlation between the design of the stent motor, such as the number of turns in the stator and the shape of the receiver, and the rotational speed was clarified.

Development of intravascular stent robot with cross type receiver