Patent ID: 8808204
Filing Date: 2014-08-19
Classification: A61B,A61H,A61N

Abstract:
1. A high-frequency operation apparatus comprising: a grasping portion configured to grasp a treatment target living tissue; an electrode provided in the grasping portion configured to supply a high-frequency current to the living tissue; a high-frequency current supplying section configured to generate the high-frequency current necessary for treatment of the living tissue via the electrode; a high-frequency current transmitting member configured to transmit the high-frequency current generated by the high-frequency current supplying section to the electrode; an impedance measuring section configured to measure an impedance value of the living tissue; a detecting section configured to detect whether the impedance value measured by the impedance measuring section reaches an impedance threshold at a time when moisture in the living tissue starts to evaporate; a calculating section configured to calculate output time in which the high-frequency current is outputted, on the basis of a length of the high-frequency current transmitting member and an area of the electrode; a storing section configured to store the output time calculated by the calculating section; a time measuring section configured to measure time in which the high-frequency current has been outputted at least after the detecting section detected that the impedance value of the living tissue reached the impedance threshold; and an output control section configured to determine whether the time in which the high-frequency current has been outputted, which is measured by the time measuring section, reaches the output time stored in the storing section and to transmit, when it is determined that the time reaches the output time, an output stop signal for the high-frequency current to the high-frequency current supplying section; wherein the detecting section determines that the impedance value measured by the impedance measuring section reaches the impedance threshold only when the impedance value reaches an impedance value several times as large as an initial impedance value of the living tissue measured by the impedance measuring section at a time of a start of supply of the high-frequency current; and wherein the impedance value measured by the impedance measuring section is a combined impedance value obtained by combining impedance by a stray capacitance of the high-frequency current transmitting member and impedance by the living tissue connected in parallel to the impedance by the stray capacitance of the high-frequency current transmitting member.