Figure 1

Plasma jet device used to treat living cells.
Structure of the jet devices and photographs of helium/oxygen plasma for different oxygen flow rates (Type 1: one channel with admixture gas, Type 2: a capillary tube acts as a separate channel for O2 gas mixing). A typical operating condition of pulsed-dc plasma jet is the applied voltage 1.8 kVpp, repetition frequency 50 kHz and duty ratio 10%.