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<p>Ultrasonic dissectors play a key role in minimally invasive medical procedures and typically operate at extremely high frequencies in the range of 55,000 to 56,000&#xa0;Hz. Accurate measurement of the blade tip amplitude and frequency is essential for optimizing the performance and safety. However, a review of current literature reveals two significant deficiencies: the lack of comprehensive blade tip amplitude simulation and measurement and the absence of a standardized method for the quantitative assessment of cutting efficiency. With regards to the first key deficiency, the present study proposes a novel analytical method for predicting the longitudinal tip displacement as a function of the actuating frequency. In the proposed approach, a modal analysis is first performed using ANSYS software to determine the natural frequency, displacement distribution, and amplification of the ultrasonic dissector under specified settings of the material properties, boundary conditions, and mesh parameters. Harmonic analyses are then proposed to verify the vibration frequency and calculate the tip amplitude of the dissector. The results show that the deviation between the average simulated resonant frequency and the experimental results is only 0.42%, confirming the high accuracy of the proposed model. The harmonic analysis yields an amplitude magnification factor of 4.54, with percentage deviations of 0.88% and 1.30% in the low- and high-power modes, respectively, relative to experimental results. Furthermore, the vibration behavior exhibits sensitivity to thermal variations; as the internal core temperature increases from 20&#xa0;°C to 60&#xa0;°C, the tip amplitude decreases by approximately 1.24–3.32%, depending on the operating power mode.</p>

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A Combined Simulation and Experimental Approach for Predicting the Resonance Frequency and Blade Tip Amplitude of Surgical Ultrasonic Dissectors

  • 期刊论文

  • 发表日期：

    2025年12月18日

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  • Y. C. Lee,
  • F. Y. Chang,
  • Y. H. Sun,
  • C. W. Liu

摘要

Ultrasonic dissectors play a key role in minimally invasive medical procedures and typically operate at extremely high frequencies in the range of 55,000 to 56,000 Hz. Accurate measurement of the blade tip amplitude and frequency is essential for optimizing the performance and safety. However, a review of current literature reveals two significant deficiencies: the lack of comprehensive blade tip amplitude simulation and measurement and the absence of a standardized method for the quantitative assessment of cutting efficiency. With regards to the first key deficiency, the present study proposes a novel analytical method for predicting the longitudinal tip displacement as a function of the actuating frequency. In the proposed approach, a modal analysis is first performed using ANSYS software to determine the natural frequency, displacement distribution, and amplification of the ultrasonic dissector under specified settings of the material properties, boundary conditions, and mesh parameters. Harmonic analyses are then proposed to verify the vibration frequency and calculate the tip amplitude of the dissector. The results show that the deviation between the average simulated resonant frequency and the experimental results is only 0.42%, confirming the high accuracy of the proposed model. The harmonic analysis yields an amplitude magnification factor of 4.54, with percentage deviations of 0.88% and 1.30% in the low- and high-power modes, respectively, relative to experimental results. Furthermore, the vibration behavior exhibits sensitivity to thermal variations; as the internal core temperature increases from 20 °C to 60 °C, the tip amplitude decreases by approximately 1.24–3.32%, depending on the operating power mode.