Pusat Pengajian Kejuruteraan Mekanikal - Monograf

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Browsing Pusat Pengajian Kejuruteraan Mekanikal - Monograf by Author "Alec, Yong Zi Chun"

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    Finite element analysis of ultrasonic cautery system.
    (2024-07)
    Alec, Yong Zi Chun
    Cautery systems are widely used in surgical procedures to cut, coagulate, and seal tissues using high-frequency ultrasonic vibrations. The prevalent use of piezoelectric elements as primary ultrasonic transducers in these systems has traditionally relied on horn-based designs. This study proposes an optimization design method for an ultrasonic cautery system without using a horn structure, based on the working theory of the ultrasonic scalpel, transducer, and horn. By eliminating the horn, the structure of the ultrasonic scalpel is simplified, and its length can be shortened. The conceptual design, executed using Solidworks, underwent iterative refinement to achieve optimal performance. The study characterizes the ultrasonic cautery system through a combination of finite element modeling (FEM) using Abaqus and SolidWorks. Simulation outcomes affirm the mechanical amplifier's efficacy, achieving an amplification ratio of 1.3199 without the use of horn by using displacement amplification compliant mechanisms. Stress analysis validates the system's resilience under operational loads, with stresses appropriately concentrated at the flexure joint. The natural frequency analysis using SolidWorks identified resonant frequencies spanning from 28390 Hz to 31755 Hz. These frequencies correspond to the first five mode shapes, which include fundamental bending as well as higher order bending and torsional modes of the ultrasonic cautery system. Thermal analysis reveals a peak operational temperature of 101.8°C, primarily localized near the blade due to friction and ultrasonic vibrations. Pressure stress analysis identifies a maximum of 24.1 N/mm2 at the jaw, alongside a peak Von Mises stress of 97.2 N/mm2, also at the jaw. The objectives of this study are achieved, demonstrating that an effective ultrasonic cautery system can be designed and optimized without the use of a horn structure, ensuring simplified and shortened design.