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Endoscopy is an important tool that can be used to identify and treat diseases and is essential to avoid cross infection when used on different people. Cold atmospheric-pressure plasmas (CAPs) offer the prospect of a future basic technology for decontaminating and sterilizing of endoscope. In this paper, we intend to design an endoscope sterilization device based on CAPs. The various lengths of gap between electrodes and electrodes themselves are considered, and the plasma distribution and its evolution are investigated. [ABSTRACT FROM PUBLISHER]

Plasma bullets have recently been used in novel applications in biology and medicine, which spurred interesting developments in the new interdisciplinary field of “Plasma Medicine.” In this paper, using high speed ICCD camera images we show that during their lifetime, plasma bullets undergo three distinctive phases: a launching phase during which the bullet velocity increases rapidly, a propagation phase during which the bullet velocity is temporarily maintained but later steadily decreases, and an ending phase during which the bullet collapses. [ABSTRACT FROM AUTHOR]

A large-scale atmospheric pressure plasma jet (APPJ) device with variable discharge cells is developed using a special designed electrode configuration, and a maximum of fifteen APPJ cells work simultaneously. The properties of APPJ arrays are investigated from plasma profile and statistical parameters. From one to fifteen cells, the peak value of discharge current rises gradually when increasing cell numbers. The APPJ images and current waveforms present good synchronism and repeatability of discharge, and the effective plasma area up to 20 cm \(^{\vphantom {\big (}2}\) is achieved. [ABSTRACT FROM PUBLISHER]

A large-area atmospheric pressure plasma with low temperature and high electron density was realized using mesh covered tube-plate electrodes at an RF power as low as 4 W. The gas temperature is less than 351 K, while the electron temperature is about 5000 K. The estimated electron density is on the order of 10^12\ \cm^-3. Electrical measurements indicate that the discharges are capacitive and operated in an abnormal glow discharge mode. In addition, a self-bias observed at the powered tube electrode increases with increasing power and is positive at high powers. [ABSTRACT FROM PUBLISHER]

A syringe needle assembled with a glass tube has been used as a plasma jet device for biomedical applications. According to the various types of ground electrode installed at the glass tube, argon plasma from an atmospheric pressure discharge has been investigated with a dc–ac inverter of several tens of kilohertz. When the ground electrode is absent or floated, the length of the plasma jet is about 10 mm at an ignition voltage of about 3 kV, and it extends further to a few tens of millimeters as the voltage increases to 5 kV. If the ground electrode is inserted inside the end of the glass tube, all plasma current is sunk directly to the ground electrode so that the plasma plume cannot emit out of the glass tube. For the case of an external ground electrode which is similar to a dielectric barrier discharge, the ignition voltage is as low as 1 kV, and the plume length is easily adjustable to be 1–10 mm in the voltage range of 1–3 kV. [ABSTRACT FROM AUTHOR]