Analysis on asymmetric current of plasma mediated electrosurgery = 플라즈마를 이용한 고주파 전기 수술법의 비대칭 전류에 관한 연구

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Asymmetric current, which is induced by the plasma during medical procedures, is investigated in the environment analogous to surgical situation. Many electrosurgical devices include DC-blocking capacitors to eliminate direct current component. However, the plasma generated between the electrode and biological tissues create asymmetric current resulting in the electrical stimulation. In this Letter, the current was significantly reduced by changing the ionization condition through using Ar or He gas and decreasing the velocity for a tissue movement. In the radiofrequency discharge, the difference of secondary electron emission coefficient causes asymmetric peaks, but the condition influences that the plasma stays in α-mode and the current is symmetrically changed. Furthermore, the electrons are also accelerated by the potential drop near the cathode surface, and the potential drop for Ar is two to third lower than the one for?? N??_2. When Ar and He gas was supplied to the gap, the ionization of the low potential drop for Ar gas is dominated in the bulk plasma, but the air plasma has high energy electrons to ionize the gas on the sheath plasma and change to γ-mode easily. These characteristics provide symmetric current to medical procedures thus eliminating the electrical stimulation and achieving safer method.
Advisors
Chang, Hong-Youngresearcher장홍영
Description
한국과학기술원 : 물리학과,
Publisher
한국과학기술원
Issue Date
2012
Identifier
488102/325007  / 020103165
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 물리학과, 2012.2, [ v, 31 p. ]

Keywords

전기수술법; 비대칭전류; 전기적자극; Electrosurgery; Asymmetric current; Electrical stimulation; Plasma; 플라즈마

URI
http://hdl.handle.net/10203/182388
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=488102&flag=dissertation
Appears in Collection
PH-Theses_Master(석사논문)
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