Patent ID: 9713242
Date: 2017-07-18
CPC Classifications: A61B,H05H

Claim:
1. Plasma treatment equipment, comprising: a plasma starting and stabilizing unit comprising a single cylindrical dielectric material having an elongated hole for supplying gas connecting to a plasma ejection port, a triggering and discharge stabilizing electrode which comprises a wire or rod electrode embedded in a tube wall thickness portion of the dielectric material so as to extend along the longitudinal direction, and a high-voltage intense electric field electrode mounted on an outer surface of the dielectric material, the plasma starting and stabilizing unit being configured to start a plasma and to maintain a stable discharge of the plasma after starting of the plasma; and a plasma generating unit, comprising the dielectric material having the elongated hole and a high-voltage plasma generating electrode located at the plasma ejection hole side relative to the high-voltage intense electric field electrode and having an area larger than that of the high-voltage intense electric field electrode, that is configured to perform main plasma generation in operation; wherein the high-voltage intense electric field electrode is provided, as seen in a cross-sectional plane perpendicular to the axis of the elongated hole, so as to extend along the curvature of the dielectric material less than 180 degrees around the center of the elongated hole, wherein the high-voltage plasma generating electrode is provided, as seen in the cross-sectional plane perpendicular to the axis, so as to extend along the curvature of the dielectric material to a greater extent than the high-voltage intense electric field electrode, wherein the high-voltage intense electric field electrode is provided so as to face the triggering and discharge-stabilizing electrode across the elongated hole formed in the dielectric material, wherein the triggering and discharge stabilizing electrode is not disposed to face the high-voltage plasma generating electrode across the elongated hole formed in the dielectric material; and wherein the triggering and discharge stabilizing electrode, the high-voltage intense electric field electrode, and the high-voltage plasma generating electrode are provided in such a manner that the electrodes are not exposed but are covered with the dielectric material to the entire space of the elongated hole which allows passage of gas from an upper stream side, starting of the plasma, generation of the plasma, and ejection of a plasma jet.