Longitudinal-bending coupled vibration ultrasonic scalpel with curved acoustic black hole structure
Based on the unique capability of curved acoustic black hole to capture and focus sound waves,a novel longitudinal-bending coupled vibration ultrasonic scalpel is proposed.The scalpel consists of a piezoelectric ultrasonic transducer,a composite amplitude converter,a bamboo bar,and a curved acoustic black hole blade.The thickness of the curved acoustic black hole blade is a power law function of the bending angle θ.The precise theoretical analysis models of the longitudinal-bending coupled vibration of the curved acoustic black hole blade and ultrasonic scalpel are constructed using the transmit matrix method and equivalent circuit method,aiming to unveil the underlying physical mechanism and design principle.The finite element method(FEM)is used to validate the theoretical calculations and compare the vibration performance and radiated sound field of the curved acoustic black hole ultrasonic scalpel with that of the conventional ultrasonic scalpel.The results demonstrate that implementing the curved acoustic black hole blade design can significantly enhance vibration displacement and lateral acoustic energy radiation,achieving more efficient surgical cutting and hemostasis.A curved acoustic black hole ultrasonic scalpel prototype is fabricated,and its practical operability was fully validated through electrical impedance analysis and laser vibration measurement experiments.
curved acoustic black hole structureultrasonic scalpellongitudinal-bending coupled vibrationradiant sound field
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