Operation apparatus

Abstract

A high-frequency operation apparatus includes a grasping portion for grasping a treatment target living tissue, an electrode for supplying a high-frequency current to the living tissue, a high-frequency current supplying section that generates the high-frequency current necessary for treatment, a cable section that transmits the high-frequency current, an impedance measuring section for measuring an impedance value of the living tissue, a detecting section that detects that the impedance value reaches an impedance threshold at a time when moisture in the living tissue starts to evaporate, a measuring section that measures an output time of the high-frequency current after the detection, a storing section that stores a set time, and an output control section that performs control for stopping an output when the output time of the high-frequency current reaches the stored set time.

What is claimed is: 
     
         1 . An operation apparatus comprising:
 a grasping portion for grasping a treatment target living tissue;   a treatment member provided in the grasping portion and for applying treatment to the living tissue by supplying a first energy to the living tissue;   a first energy supplying section for supplying the first energy to the living tissue via the treatment member;   an electrode provided in the treatment member and for applying treatment to the living tissue using a high-frequency current;   a second energy supplying section for supplying the high-frequency current serving as the second energy to the living tissue via the electrode;   a high-frequency current transmitting member that transmits the high-frequency current supplied from the second energy supplying section to the electrode;   an impedance measuring section for measuring an impedance value of the living tissue;   a detecting section that detects that the impedance value measured by the impedance measuring section, of which impedance changes in accordance with evaporation of moisture in the living tissue, has reached a desired impedance threshold;   a clock that measures a time;   a time measuring section that start measuring a time by the clock when the detecting section detects that the impedance value of the living tissue has reached the impedance threshold; and   an output control section that determines whether the time measured by the time measuring section has reached the predetermined time, and when it is determined that the measured time has reached the predetermined time, performs control for stopping an output of the high-frequency current by the second energy supplying section.   
     
     
         2 . The operation apparatus according to  claim 1 , wherein
 the clock measures time when the first energy and the second energy are outputted, and   when the output control section determines that the output time of the first energy and the second energy has reached the predetermined time, the output control section performs control to stop output of the second energy by the second energy supplying section.   
     
     
         3 . The operation apparatus according to  claim 2 , wherein when the output control section determines that the output time of the first energy and the second energy has reached the predetermined time, the output control section performs control to stop output of the first energy by the first energy supplying section. 
     
     
         4 . The operation apparatus according to  claim 1 , wherein the detecting section detects that the impedance threshold when the moisture in the living tissue start evaporating has been reached. 
     
     
         5 . The operation apparatus according to  claim 1 , further comprising:
 a calculating section that calculates output time in which the second energy is outputted from a length of the high-frequency current transmitting member and an area of the electrode, wherein   the output control section determines whether or not the time measured by the time measuring section has reached the output time.   
     
     
         6 . The operation apparatus according to  claim 1 , further comprising:
 a storing section that store the output time calculated by the calculating section,   wherein the output control section determines whether or not the time measured by the time measuring section has reached the output time stored in the storing section.   
     
     
         7 . The operation apparatus according to  claim 1 , wherein
 the time measuring section further measures, as a detection time, time from a time of a start of supply of the first energy and the second energy to the living tissue until the detecting section detects that the impedance value reaches the impedance threshold, and   the operation apparatus further comprises a correcting section that corrects the predetermined time based on the detection time measured by the time measuring section.   
     
     
         8 . The operation apparatus according to  claim 7 , wherein the correcting section calculates a correction coefficient according to the detection time and a standard time from the time of the start of supply of the first energy and the second energy until the detecting section detects that the impedance value of the living tissue reaches the impedance threshold and corrects the predetermined time based on the calculated correction coefficient. 
     
     
         9 . The operation apparatus according to  claim 1 , wherein the detecting section determines that the impedance value reaches the impedance threshold when the impedance value increases to 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 first energy and the second energy. 
     
     
         10 . The operation apparatus according to  claim 1 , wherein the detecting section detects the impedance threshold set in an impedance change region that suddenly increases stepwise in a short time from an initial impedance value measured by the impedance measuring section when the first energy and the second energy start to be supplied to the living tissue to an impedance value about several times as large as the initial impedance value. 
     
     
         11 . The operation apparatus according to  claim 1 , wherein the detecting section detects that the impedance value reaches the impedance threshold at the time when moisture in the living tissue starts to evaporate only when the detecting section detects that the impedance value measured by the impedance measuring section reaches the impedance threshold and a change amount of the impedance value measured by the impedance measuring section in a short time exceeds a second impedance threshold. 
     
     
         12 . The operation apparatus according to  claim 1 , 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. 
     
     
         13 . The operation apparatus according to  claim 1 , wherein the impedance threshold is set to a predetermined value within a range of 100Ω to 500Ω, and the set predetermined value is stored in advance. 
     
     
         14 . The operation apparatus according to  claim 1 , wherein the predetermined time is set to a predetermined value in a range of 100 ms to 20000 ms. 
     
     
         15 . The operation apparatus according to  claim 6 , wherein the storing section stores the predetermined time set based on the length of the high-frequency current transmitting member and the area of the electrode in order to complete treatment of coagulation.