Ultrasonic surgical instrument having features for forming bubbles and enhancing cavitation

摘要

The ultrasonic element includes an ultrasonic transducer and a head or a blade. The ultrasonic transducer is operable to convert electrical power into ultrasonic vibration. The head or blade is in acoustic communication with the ultrasonic transducer such that the ultrasonic transducer is operable to drive the ultrasonic blade to vibrate ultrasonically. The head or blade has a curved distal surface. The curved distal surface defines a concave curve extending in the proximal direction. The transducer and head or blade may be driven using control logic configured to cause the ultrasonic transducer to generate a second set of vibrations following the first set of vibrations. The first set of vibrations is configured to generate microbubbles in the fluid. The second set of vibrations is configured to grow microbubbles generated by the first set of vibrations. The control logic can provide a pause between the first set of vibrations and the second set of vibrations.