Plasma probe for medical treatment of tissue

A method of treatment of biological tissue, the method comprising:

• providing a plasma probe, the plasma probe comprising:
• a distal end and a proximal end;
• a flexible hose extending from a proximal end along a longitudinal center axis (L) towards the distal end, the flexible hose defining a lumen therein connected to an ionizable gas;
• an electrical conductor extending from an electrode at the proximal end toward the distal end and electrically connected to an electrical generator;
• and
• a head piece attached to the flexible hose, the head piece defining an interior therein connected to the lumen, the head piece having a rounded end section and at least one plasma exit window connected to the interior;
• contacting the rounded end section with the biological tissue;
• flowing the ionizable gas through the lumen, the interior, and the at least one plasma exit window in a direction of the biological tissue;
• supplying the electrode with high-frequency (HF) voltage from the electrical generator sufficient to ionize the ionizable gas thereby generating a plasma flow;
• directing the plasma flow through the at least one plasma exit window towards the biological tissue;
• applying the plasma flow to the biological tissue until at least one of tissue coagulation and ablation;
• and
• sliding the rounded end section across the biological tissue.