Electrode unit and endoscope system

An electrode unit comprising:

• an electrode supporting member comprising:
• a pair of distal end rigid members extending along a longitudinal axis, each of the pair of distal end rigid members being covered by an electrically insulating material, and
• an elastic region member having a lower bending rigidity than a bending rigidity of the pair of distal end rigid members, the elastic region member being provided on a proximal end side of each of the pair of distal end rigid members;
• and
• an electrode located between the pair of distal end rigid members, the electrode configured to apply a high-frequency energy to a tissue, the electrode comprising:
• a flat portion extending linearly between the pair of distal end rigid members;
• and
• a pair of base portions directly extending perpendicularly to the longitudinal axis from a respective distal end rigid member of the pair of distal end rigid members toward each other from opposed faces of the pair of distal end rigid members when viewed along the longitudinal axis;
• wherein the electrode is an exposed wire having a surface configured to directly press against the tissue.

An electrode unit comprising:

• a pair of insulators extending along a longitudinal axis;
• and
• an elastic portion located on a proximal end side of each of the pair of insulators;
• and
• an electrode located between the pair of insulators;
• wherein a bending rigidity of the elastic region member being such that the elastic region member elastically deforms and is curved relative to the pair of insulators when the electrode is pressed against a tissue surface;
• the electrode is an exposed wire having a surface configured to directly press against the tissue surface;
• and
• the electrode comprising a pair of base portions directly extending perpendicularly to the longitudinal axis from a respective insulator of the pair of insulators toward each other from opposed faces of the pair of insulators when viewed along the longitudinal axis.