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Tissue pad degradation of ultrasonic device may enhance thermal injury and impair its sealing performance in liver surgery

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World Journal of Hepatology 2022年第7期14卷 1357-1364页

作者： masatoshi kajiwara Takahisa Fujikawa Suguru Hasegawa Department of Gastroenterological Surgery Fukuoka UniversityFukuoka 814-0180FukuokaJapan Department of Surgery Kokura Memorial HospitalKitakyushu 802-8555FukuokaJapan

BACKGROUND Ultrasonic devices are widely used in many surgical fields,including hepatectomy;however,the negative effects of tissue pad degradation of ultrasonic devices,including those in liver surgery,remain *** Harmonic®1100(H-1100)scalpel has advanced heat control technology than previous models,such as the Harmonic®HD1000i(H-HD1000i).We hypothesized that,because of its advanced temperature-control technology,the H-1100 scalpel would show less tissue pad degradation,resulting in superior sealing performance,compared to that with the H-HD1000i *** To elucidate ultrasonic device tissue pad degradation effects on instrument temperature and sealing performance using ex vivo porcine liver/vessel *** Two different harmonic scalpels were used and compared:A newer model,the H-1100 scalpel,and an older model,the H-HD1000i *** ex vivo porcine livers,each instrument was activated until the liver parenchyma was *** device temperature(passive jaw temperature)was measured after every 10 consecutive activations,until 300 transections of the porcine liver were *** pad degradation was evaluated after 300 *** performance was evaluated using excised porcine carotid vessels;vessel sealing speed and frequency of vessel burst pressure below 700 mmHg were determined after 300 transections of porcine liver *** The temperature of the H-HD1000i scalpel was approximately 10℃higher than that of the H-1100 scalpel,and gradually increased as the number of activations *** median passive jaw temperature of the H-HD1000i scalpel was significantly higher than that of the H-1100 scalpel(73.4℃vs 65.1℃;P<0.001).After 300 transections of porcine liver parenchyma,less tissue pad degradation was observed with the H-1100 scalpel than with the H-HD1000i scalpel(0.08 mm vs 0.51 mm).The H-1100 scalpel demonstrated faster vessel-sealing speed(4.9 *** 5.1 sec.)and less frequent vessel burst pressure<700 mm

关键词： Ultrasonic device Harmonic scalpel Tissue pad degradation Hepatectomy Device temperature Vessel sealing

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Global and Kinetic MHD Simulation by the Gpic-MHD Code

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Plasma Science and Technology 2011年第5期13卷 528-534页

作者： Hiroshi NAITOU Yusuke YAMADA Kenji kajiwara Wei-li LEE Shinji TOKUDA masatoshi YAGI Graduate School of Science and Engineering Yamaguchi University Princeton Plasma Physics Laboratory International Fusion Energy Research Center Research Institute for Applied Mechanics Kyushu University Japan Atomic Energy Agency

In order to implement large-scale and high-beta tokamak simulation, a new algorithm of the electromagnetic gyrokinetic PIC （particle-in-cell） code was proposed and installed on the Gpic-MHD code [Gyrokinetic PIC code for magnetohydrodynamic （MHD） simulation]. In the new algorithm, the vorticity equation and the generalized Ohm＇s law along the magnetic field are derived from the basic equations of the gyrokinetic Vlasov, Poisson, and Ampere system and are used to describe the spatio-temporal evolution of the field quantities of the electrostatic potential φ and the longitudinal component of the vector potential Az. The basic algorithm is equivalent to solving the reduced-MHD-type equations with kinetic corrections, in which MHD physics related to Alfven modes are well described. The estimation of perturbed electron pressure from particle dynamics is dominant, while the effects of other moments are negligible. Another advantage of the algorithm is that the longitudinal induced electric field, ETz = -δAz/δt, is explicitly estimated by the generalized Ohm＇s law and used in the equations of motion. Furthermore, the particle velocities along the magnetic field are used （vz-formulation） instead of generalized momentums （pz-formulation）, hence there is no problem of ＇cancellation＇, which would otherwise appear when Az is estimated from the Ampere＇s law in the pz-formulation. The successful simulation of the collisionless internal kink mode by the new Gpic-MHD with realistic values of the large-scale and high-beta tokamaks revealed the usefulness of the new algorithm.

关键词： tokamak gyrokinetic theory magnetohydrodynamics internal kink mode

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