Abstract: A thermosensitive probe includes: a non-metallic thermoconductive member defining a housing space; a thermosensitive element disposed in the housing space; and a coupling member having a portion surrounding the thermosensitive element in the housing space while fixing the thermosensitive element to the thermoconductive member.

Abstract: A link mechanism for an arm portion includes an arm portion, a non-rotating arm attachment portion, a variable-length rod, and a fixed-length rod. The arm portion holds a medical instrument. The arm portion is attached to the arm attachment portion to be rotatable about an arm rotational axis as a center. The variable-length rod includes an elastic member which biases an elastic force to bring about a recovery against a pressing force. One end of the variable-length rod is pivotably attached to the arm attachment portion and the other end of the variable-length rod is pivotably connected to one end of the fixed-length rod. The fixed-length rod has its other end attached to the arm portion to be movable about the arm rotational axis upon rotation of the arm portion.