The ultrasonic trocar provides a gentle and bloodless approach to the abdominal cavity

Although the trocar safety shield system decreases abdominal organ injury, the probability of bleeding from the abdominal wall port site had still not been resolved. We therefore developed a novel ultrasonic vibrating trocar, that prevents bleeding by an ultrasonic cavitation effect. The ultrasonic vibrating trocar has the advantage of ease of insertion, and the force requ ired for trocar insertion is only 34% of the force required by commercially available trocars. Bleeding from the abdominal wall was prevented by an ul trasonic cavitation effect.