A miniature longitudinal-flexural coupling ultrasonic scalpel transducer is studied,in order to reduce size and improve efficiency of the ultrasonic scalpel.The blade shaft and the head mass are designed as whole in order to reduce the size.The asymmetric grooves are designed to achieve the longitudinal-flexural coupling vibration and to improve the efficiency.The equivalent circuit of the miniature longitudinal-flexural coupling ultrasonic scalpel transducer is established,and the dimensions of the transducer are designed based on the equivalent circuit.The longitudinal-flexural coupling vibration mode shape of the transducer is validated by finite element method.After discussing the effects of groove dimensions on the flexural vibration excursion and the frequency,the groove dimensions are optimized.According to the final design,a transducer prototype is fabricated and tested.The resonant frequency of the transducer is 51.5 kHz,and the tip vibration excursion is 72.5µm,which satisfy the surgery requirements.
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