Analysis of the ultrasonic cautery
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Date
2018-06
Authors
Lee, Han Wei
Journal Title
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Abstract
Thermal cautery is a device used by surgeon in surgical operation to replace scalpel
and to mitigate bleeding. The most popular cautery that used today is electrocautery. For the
electrocautery, the current design of the thermal cautery facing safety issues while using it.
One of the solution is introducing the ultrasonic technology in cautery. Both the usage of the
electrocautery and ultrasonic cautery is compared show that the ultrasonic cautery has its
advantages of safety features and has lower side effect to the patient after the surgery
although the electrocautery has the advantages of cheaper in price, lighter and easier in
maintenance.
The information on the technology and working principle on the design of ultrasonic
cautery does not given in any source thus the research and analysis on the technology and
working principles of an ultrasonic cautery is important before any design work or
improvement can be done. A review on the current design of the ultrasonic cautery has been
done and it shows that most ultrasonic cautery need to be operate between 20kHz to 60kHz.
Piezoelectric is used as the actuator to produce ultrasonic frequency due to its
popularity in usage and has relative simpler usage. The control system to control the
piezoelectric actuator is set up to control the piezoelectric actuator. The principles involve in
a piezoelectric actuator is studied and experimented. Then amplification mechanism to
amplify the amplitude of a piezoelectric actuator which has only 5𝜇𝑚 is studied and
analysed.
Resonator and sonotrode are found to be more suitable to be used as the amplification
mechanism. Therefore, both the resonator and sonotrode are studied and analysed using both
experiment and finite element analysis (FEA). The resonator has proved to be work as able
the amplification mechanism since it will amplify the stroke or amplitude of the resonator by
at least twice. The finite element analyse (FEA) on the sonotrode has been done also in order
to prove its functionality.