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A syringe needle assembled with a glass tube has been used as a plasma jet device for biomedical applications. According to the various electrode diameter of power electrode installed inside the glass tube, helium plasma from an atmospheric pressure discharge has been investigated. The discharge is driven by pulsed direct current voltages. It is found that the measured discharge current was remain very low with increasing applied voltage from zero up to given applied voltage ( breakdown voltage), the value of breakdown voltage depends on the value of electrode diameter and flow rate of the helium, The discharge current was increased suddenly at breakdown voltage reached maximum value and remain nearly stable with applied voltage. The discharge current increases with applied voltage and flow helium rate but decreases with electrode diameter.

Effects of the small diameter and the flow rate on the electric properties of the plasma needle