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KMID : 1137820220430050319
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의공학회지
2022 Volume.43 No. 5 p.319 ~ p.330
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Finite Element Analysis for the Development of Bone Surgery Piezoelectric Ultrasonic Medical Device and its Experimental Verification
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Song Tae-Ha
Lee Jung-Ho
Choi Jong-Kyun
Lee Hee-Won
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Abstract
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In this study, the optimal driving frequency was derived through finite element analysis (FEA) to optimize the developed piezoelectric ultrasonic medical devices(PUMD) for bone surgery. The core of the PUMD is the piezo- electric ceramic (PZT), which is a vibrator that generates vibration energy. The piezoelectric ceramic shows the max- imum current value with respect to the input voltage at the resonance frequency, which generates the maximum mechanical vibration. In the past, various studies have been conducted related to the analysis of PUMD, but most of the research so far has been limited to free vibration analysis. However, in order to derive the accurate resonant fre- quency, the initial stress generated by bolt tightening in the bolt-clamped Langevin type transducer (BLT) must be considered. In this study, after designing a PUMD, the driving performance according to the bolt tightening value was analyzed through FEA, and this was experimentally verified. First, the resonance mode and frequency response were confirmed through modal and harmonic analysis at 20-40 kHz, which is known as the optimal driving frequency band of PUMD for bone surgery. In addition, the design of the PUMD was confirmed by checking the mechanical behavior of the tip and the piezoelectric ceramic at the resonant frequency. Consequentially, the characteristic evaluation was performed, and it was confirmed that the resonant frequency result derived through the FEA was reasonable. Through this study, we presented a more rational FEA method than before for BLT transducers. We expect that this will shorten the time and cost of developing a PUMD, and will enable the development of more stable and high-quality products.
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KEYWORD
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Piezoelectric ultrasonic medical device, PZT, Bolt-clamped Langevin type transducer, BLT, Finite element analysis
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