Abstract:
An energy treatment device including a movable handle having a jaw and a first through hole, and a sheath having a hollow portion and a second through hole, wherein the hollow portion is configured to receive an elongated member. The second through hole is configured to extend so as to eliminate an overlap with the hollow portion, and the movable handle is configured to rotate about an axis configured to pass through the first through hole and the second through hole such that the jaw rotates with respect to the sheath.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application is a Divisional application of U.S. Ser. No. 15/060,535, filed Mar. 3, 2016, which is a Continuation application of PCT Application No. PCT/JP2015/056229, filed Mar. 3, 2015 and based upon and claiming the benefit of priority from prior Japanese Patent Application No. 2014-083863, filed Apr. 15, 2014, the entire contents of all of which are incorporated herein by reference. 
     
    
     BACKGROUND OF THE INVENTION 
       [0002]    1. Field of the Invention 
         [0003]    The present invention relates to a forceps type of energy treatment device in which a movable handle is opened and closed to a fixed handle, thereby opening and closing a distal end portion of a jaw to a distal end portion of a probe. 
         [0004]    2. Description of the Related Art 
         [0005]    For example, Jpn. PCT National Publication No. 2012-531970 discloses a forceps type of energy treatment device having a probe. This treatment device has the probe to be inserted into a sheath and a jaw openable and closable to the probe. The sheath and the probe are extended along a longitudinal axis. The jaw is attached to a distal end portion of the sheath so that the jaw is rotatable (openable and closable) around an opening/closing axis. The opening/closing axis is provided perpendicularly to the longitudinal axis. The above attaching is performed by a pair of bearings or the like provided between an outer peripheral surface of the sheath and an inner peripheral surface of the jaw. 
         [0006]    A distal end portion of the jaw closes to a distal end portion of the probe so that the distal end portion of the jaw and the distal end portion of the probe sandwich a treatment object such as a biological tissue therebetween to grasp the treatment object. The distal end portion of the jaw opens to the distal end portion of the probe so that the distal end portion of the jaw and the distal end portion of the probe are pushed into, e.g., the treatment object to expand and peel off the treatment object. 
       BRIEF SUMMARY OF THE INVENTION 
       [0007]    An aspect of an energy treatment device of the present invention including a longitudinal probe that transmits an ultrasonic vibration; a distal end portion that is provided on a distal end side of the probe and treats a treatment object by the ultrasonic vibration; a sheath that has a hollow portion and a distal end and the distal end portion projects from the distal end in a state where the probe is inserted into the hollow portion; a fixed handle that is provided in a proximal end portion of the sheath and on which an operator places a first finger; a movable handle that has, on a proximal side, a finger placing portion on which the operator places a second finger, and that has, on a distal side, a jaw which grasps the treatment object together with the distal end portion; a jaw side through hole portion that is provided in the movable handle and formed between the finger placing portion and the jaw; a sheath side through hole portion that is provided in the sheath and provided at a position at which the sheath side through hole portion does not overlap with the hollow portion; and an opening/closing axis member that is inserted in the jaw side through hole portion and the sheath side through hole portion to openably and closably attach the movable handle to the fixed handle. 
         [0008]    Advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out hereinafter. 
     
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING 
         [0009]    The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention, and together with the general description given above and the detailed description of the embodiments given below, serve to explain the principles of the invention. 
           [0010]      FIG. 1  is a schematic view of a medical treatment apparatus according to a first embodiment of the present invention; 
           [0011]      FIG. 2  is a cross-sectional view showing a configuration of a transducer unit; 
           [0012]      FIG. 3  is a side view including a partial cross section of a probe; 
           [0013]      FIG. 4  is a schematic cross-sectional view showing an inner configuration of a fixed handle; 
           [0014]      FIG. 5  is a schematic view showing an electric connection state in a transducer case, a cylindrical member and an electric connection ring; 
           [0015]      FIG. 6  is a cross-sectional view along the VI-VI line shown in  FIG. 1 ; 
           [0016]      FIG. 7A  is a schematic view of a medical treatment apparatus showing one example of an arrangement of an attaching portion of the present invention; 
           [0017]      FIG. 7B  is a cross-sectional view along the VIIB-VIIB line shown in  FIG. 7A ; 
           [0018]      FIG. 8A  is a cross-sectional view along the VI-VI line shown in  FIG. 1 , and a view showing one example of an arrangement of preventing members; 
           [0019]      FIG. 8B  is a cross-sectional view along the VI-VI line shown in  FIG. 1 , and a view showing one example of the arrangement of the preventing members; 
           [0020]      FIG. 9A  is a perspective view of a jaw shown in  FIG. 1  of the first embodiment, and a view showing a regulating mechanism according to a second embodiment; 
           [0021]      FIG. 9B  is a view showing a state where the regulating mechanism according to the second embodiment regulates an opening/closing angle α so that the opening/closing angle α of a movable handle to a fixed side is minimize, and the regulating mechanism according to the second embodiment positioned the minimum closing position of the movable handle; 
           [0022]      FIG. 9C  is a view showing a state where the regulating mechanism according to the second embodiment regulates the opening/closing angle α so that the opening/closing angle α of the movable handle to the fixed side is maximize, and the regulating mechanism according to the second embodiment positioned the maximum opening position of the movable handle; 
           [0023]      FIG. 10A  is a perspective view of a jaw shown in  FIG. 7A  in the first embodiment, and is a view showing a regulating mechanism according to a modification of the second embodiment; 
           [0024]      FIG. 10B  is a view showing a state where the regulating mechanism according to the modification of the second embodiment regulates the opening/closing angle α of the movable handle to the fixed side is minimize, and the regulating mechanism according to the modification of the second embodiment positioned the minimum closing position of the movable handle; and 
           [0025]      FIG. 10C  is a view showing a state where the regulating mechanism according to the modification of the second embodiment regulates the opening/closing angle α so that the opening/closing angle α of the movable handle to the fixed side is maximize, and the regulating mechanism according to the modification of the second embodiment positioned the maximum opening position of the movable. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0026]    Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 
       First Embodiment 
       [0027]    [Configuration] 
         [0028]    A first embodiment will be described with reference to  FIG. 1 ,  FIG. 2 ,  FIG. 3 ,  FIG. 4 ,  FIG. 5  and  FIG. 6 . In some of the drawings, some of the members are omitted for clarification of the drawings. 
         [0029]    [Medical Treatment Apparatus  1 ] 
         [0030]    A medical treatment apparatus  1  shown in  FIG. 1 , sandwiches a treatment object such as a biological tissue to grasp the treatment object by a first electrode portion  21  that functions as a distal end portion of a probe  3  and a second electrode portion  53  that functions as a distal end portion of a jaw  52 , in the probe  3  and the jaw  52  to be provide in an after-mentioned energy treatment device (hereinafter referred to as a treatment device  10 ). The grasping is performed when the second electrode portion  53  is closed (brought close) to the first electrode portion  21 . Further, the medical treatment apparatus  1  is capable of treating the grasped treatment object by, e.g., energy of an ultrasonic wave, a high frequency, heat or the like. The medical treatment apparatus  1  is a grasping treatment apparatus. It is to be noted that the medical treatment apparatus  1  of the present embodiment is also used as a bipolar treatment apparatus that treats by a high-frequency current by use of the distal end portion of the probe  3  and the jaw  52  as electrodes. The medical treatment apparatus  1  is also used as an ultrasonic treatment apparatus that treats by an ultrasonic vibration. 
         [0031]    The medical treatment apparatus  1  peels off the treatment object by the distal end portion of the probe  3  and the jaw  52  which are pushed into the treatment object. The peeling is performed when the second electrode portion  53  opens (comes away) from the first electrode portion  21 . 
         [0032]    As shown in  FIG. 1 , the medical treatment apparatus  1  has a power source unit  7  that functions as a supplying unit to supply electric power for the energy, and the treatment device  10  that treats the treatment object by the energy supplied from the power source unit  7 . 
         [0033]    [Power Source Unit  7 ] 
         [0034]    As shown in  FIG. 1 , the power source unit  7  has an ultrasonic control portion  8  that controls a current for the ultrasonic vibration, a high-frequency current control portion  9  that controls the current for the high frequency, and a cable  6  that electrically connects the ultrasonic control portion  8  to the treatment device  10  and electrically connects the high-frequency current control portion  9  to the treatment device  10 . One end of the cable  6  is connected to the power source unit  7 , and the other end of the cable  6  is connected to a proximal end of a transducer case  11  which will be described later. 
         [0035]    [Treatment Device  10 ] 
         [0036]    As shown in  FIG. 1 , the treatment device  10  has a transducer unit  2 , the probe  3 , a sheath unit  4 , and a movable handle unit  5 . The transducer unit  2 , the probe  3  and the sheath unit  4  are on a fixed side, and the movable handle unit  5  is a movable side that is rotatably movable to the fixed side. 
         [0037]    [Transducer Unit  2 ] 
         [0038]    As shown in  FIG. 1  and  FIG. 2 , the transducer unit  2  has the transducer case  11 . As described above, the proximal end of the transducer case  11  is connected to an end portion of the cable  6 . 
         [0039]    As shown in  FIG. 2 , the transducer unit  2  has an ultrasonic transducer  12  provided in the transducer case  11 . The ultrasonic transducer  12  has a piezoelectric element that converts the current supplied from the ultrasonic control portion  8  into the ultrasonic vibration. 
         [0040]    The ultrasonic transducer  12  is connected to one end of each of electric signal lines  13 A and  13 B. The electric signal lines  13 A and  13 B are provided in the cable  6 . Further, the other end of each of the electric signal lines  13 A and  13 B is connected to the ultrasonic control portion  8 . The current is supplied from the ultrasonic control portion  8  to the ultrasonic transducer  12  via the electric signal lines  13 A and  13 B, thereby generating the ultrasonic vibration in the ultrasonic transducer  12 . 
         [0041]    The ultrasonic transducer  12  is connected to one end of an electric signal line  17  separately from the electric signal lines  13 A and  13 B. The electric signal line  17  is provided in the cable  6 . Further, the other end of the electric signal line  17  is connected to the high-frequency current control portion  9 . 
         [0042]    The electric signal lines  13 A,  13 B and  17  are included in the cable  6 . 
         [0043]    As shown in  FIG. 2 , the transducer unit  2  further has a horn  15  that enlarges an amplitude of the ultrasonic vibration generated in the ultrasonic transducer  12 . The horn  15  is coupled with a distal end of the ultrasonic transducer  12  so that the horn  15  is positioned at the distal end of the ultrasonic transducer  12 . 
         [0044]    The horn  15  is attached to the transducer case  11  via an insulating member  15   a , and electrically insulated from the transducer case  11  by the insulating member  15   a . The horn  15  has an internal thread portion  16  formed in a distal end portion of the horn  15 . 
         [0045]    [Probe  3 ] 
         [0046]    As shown in  FIG. 3 , the probe  3  is provided along a longitudinal axis C. The longitudinal axis C functions as a central axis of the probe  3 . The probe  3  has a columnar shape. The probe  3  has an external thread portion  19  formed in a proximal end portion of the probe  3  to be screwed into the internal thread portion  16 . 
         [0047]    The probe  3  is attached to the horn  15  by the screwing. In consequence, the ultrasonic vibration generated in the ultrasonic transducer  12  is transmitted to a distal end of the probe  3  via the horn  15  and the probe  3 . That is, the ultrasonic vibration is transmitted from a proximal end of the probe  3  to the distal end of the probe  3 . It is to be noted that the ultrasonic vibration is a vertical vibration in which a transmitting direction of the vibration matches a vibrating direction. 
         [0048]    The probe  3  is attached to the horn  15 , whereby a probe side current path of a high-frequency current is formed from the high-frequency current control portion  9  through the electric signal line  17 , the ultrasonic transducer  12  and the horn  15  to a distal end portion of the probe  3 . The probe side current path indicates a path through which the high-frequency current flows. The probe  3  has the first electrode portion  21  that functions as the distal end portion of the probe  3 . That is, the high-frequency current is transmitted along the longitudinal axis C between the high-frequency current control portion  9  and the first electrode portion  21  through the probe side current path. 
         [0049]    [Sheath Unit  4 ] 
         [0050]    As shown in  FIG. 1 , the sheath unit  4  is extended along the longitudinal axis C. The sheath unit  4  has a fixed handle  22  and a sheath  23  attached to a distal end of the fixed handle  22 . 
         [0051]    As shown in  FIG. 1  and  FIG. 4 , the fixed handle  22  has a handle casing  27  that functions as an exterior portion. The handle casing  27  has a fixed handle ring  28  that is provided in a part on the side of an after-mentioned second direction of the handle casing  27  and that functions as a fixed side finger placing portion. The fixed handle ring  28  projects toward a second direction to the longitudinal axis C. In the second direction, the fixed handle ring  28  is provided on an outer side to an opening/closing axis member  100  that will be described later. 
         [0052]    As shown in  FIG. 4 , the handle casing  27  has a cylindrical member  29  provided in the handle casing  27  and fixed to the handle casing  27 . The proximal end of the probe  3  is extended into the cylindrical member  29 . In the cylindrical member  29 , the probe  3  is attached to the horn  15  as described above. The cylindrical member  29  supports the probe  3  and the horn  15  via insulating members  31 . In consequence, the probe  3  and the horn  15  are prevented from coming in contact with the cylindrical member  29 , and the probe  3  and the horn  15  are electrically insulated from the cylindrical member  29 . 
         [0053]    On an outer peripheral side of the cylindrical member  29 , an electric connection ring  32  is provided. The electric connection ring  32  is provided to be fixed to an inner peripheral surface of the handle casing  27 . A distal end portion of the transducer case  11  is engaged between the cylindrical member  29  and the electric connection ring  32 . The distal end portion of the transducer case  11  is engaged in between the cylindrical member  29  and the electric connection ring  32 , whereby the transducer case  11  is coupled with the fixed handle  22  (the sheath unit  4  and the handle casing  27 ). In a state where the transducer case  11  is coupled with the fixed handle  22 , an outer peripheral portion of the distal end portion of the transducer case  11  comes in contact with the electric connection ring  32 , and an inner peripheral portion of the distal end portion of the transducer case  11  comes in contact with the cylindrical member  29 . 
         [0054]    As shown in  FIG. 1  and  FIG. 4 , the handle casing  27  has an inclined flat surface  33  provided in a part on the side of the second direction (the direction of an arrow A 2  shown in  FIG. 1  and  FIG. 4 ) of the handle casing  27  (the fixed handle  22 ) and inclined to the longitudinal axis C. The inclined flat surface  33  is provided on a distal end direction side to the fixed handle ring  28 . The inclined flat surface  33  is positioned on a proximal end direction side as the inclined flat surface is away from a first direction (a direction of an arrow A 1  shown in  FIG. 1  and  FIG. 4 ) toward the second direction. In other words, the inclined flat surface  33  is upwardly inclined from the distal end direction side toward the proximal end direction side of the handle casing  27 . In consequence, an angle between the inclined flat surface  33  and the longitudinal axis C is an acute angle β. 
         [0055]    As shown in  FIG. 1  and  FIG. 4 , the handle casing  27  has input buttons  35 A and  35 B that are two operation input portions provided on the inclined flat surface  33 . When the input buttons  35 A and  35 B are pressed, an operator&#39;s operation is input. A pressing direction of the input buttons  35 A and  35 B is perpendicular to, e.g., the inclined flat surface  33 . 
         [0056]    As shown in  FIG. 1  and  FIG. 4 , the handle casing  27  has switch portions  37 A and  37 B and an electric circuit substrate  38  provided on an inner peripheral side of the inclined flat surface  33 . Opening and closing states of the switch portion  37 A are switched by an input operation in the input button  35 A. Similarly, opening and closing states of the switch portion  37 B are switched by an input operation in the input button  35 B. 
         [0057]      FIG. 5  is a view schematically showing an electric connection state in the transducer case  11 , the cylindrical member  29  and electric connection ring  32 . As shown in  FIG. 4  and  FIG. 5 , the handle casing  27  has three electric signal lines,  39 A,  39 B and  39 C provided in the handle casing  27 . The electric signal line  39 A is electrically connected to the switch portion  37 A via the electric circuit substrate  38 . The electric signal line  39 B is electrically connected to the switch portion  37 B via the electric circuit substrate  38 . The electric signal line  39 C is electrically connected to the switch portion  37 A and the switch portion  37 B via the electric circuit substrate  38 . The electric signal line  39 C is a common line to be shared as a ground line of the switch portion  37 A and the switch portion  37 B. 
         [0058]    As shown in  FIG. 5 , the electric connection ring  32  has a first electric connecting portion  42 A, a second electric connecting portion  42 B and a third electric connecting portion  42 C. The first electric connecting portion  42 A is electrically insulated from the second electric connecting portion  42 B, the second electric connecting portion  42 B is electrically insulated from the third electric connecting portion  42 C, and the first electric connecting portion  42 A is electrically insulated from the third electric connecting portion  42 C. The electric signal line  39 A is connected to the first electric connecting portion  42 A. The electric signal line  39 B is connected to the second electric connecting portion  42 B. The electric signal line  39 C is connected to the third electric connecting portion  42 C. 
         [0059]    As shown in  FIG. 5 , the transducer case  11  has a first conductive portion  43 A, a second conductive portion  43 B and a third conductive portion  43 C. The first conductive portion  43 A, the second conductive portion  43 B and the third conductive portion  43 C are extended along the longitudinal axis C. The first conductive portion  43 A is electrically insulated from the second conductive portion  43 B, the second conductive portion  43 B is electrically insulated from the third conductive portion  43 C, and the first conductive portion  43 A is electrically insulated from the third conductive portion  43 C. In the state where the transducer case  11  is coupled with the fixed handle  22  (the sheath unit  4 ), a distal end portion of the first conductive portion  43 A electrically comes in contact only with the first electric connecting portion  42 A. Similarly, a distal end portion of the second conductive portion  43 B electrically comes in contact only with the second electric connecting portion  42 B. Further, a distal end portion of the third conductive portion  43 C electrically comes in contact only with the third electric connecting portion  42 C. 
         [0060]    As shown in  FIG. 5 , a proximal end portion of the first conductive portion  43 A is connected to one end of an electric signal line  45 . A proximal end portion of the second conductive portion  43 B is connected to one end of an electric signal line  46 . A proximal end portion of the third conductive portion  43 C is connected to one end of an electric signal line  47 . The electric signal lines  45 ,  46  and  47  are provided in the cable  6 . The other end of each of the electric signal lines  45 ,  46  and  47  is connected to the power source unit  7 . 
         [0061]    As described above, a first electric signal path is formed from the switch portion  37 A through the electric signal line  39 A, the first electric connecting portion  42 A, the first conductive portion  43 A and the electric signal line  45  to the power source unit  7 . A second electric signal path is formed from the switch portion  37 B through the electric signal line  39 B, the second electric connecting portion  42 B, the second conductive portion  43 B and the electric signal line  46  to the power source unit  7 . Further, a ground path is formed from the switch portion  37 A and the switch portion  37 B through the electric signal line  39 C, the third electric connecting portion  42 C, the third conductive portion  43 C and the electric signal line  47  to the power source unit  7 . 
         [0062]    The input button  35 A is pressed, thereby bringing the switch portion  37 A into a closed state, and the switch portion  37 A electrically connects the first electric signal path to the ground path. In consequence, an electric signal is transmitted from the switch portion  37 A to the power source unit  7 . Further, for example, a current is supplied from the ultrasonic control portion  8  to the ultrasonic transducer  12  via the electric signal lines  13 A and  13 B. The ultrasonic vibration is generated in the ultrasonic transducer  12 , and simultaneously, the state is switched to a state where the high-frequency current is output from the high-frequency current control portion  9 . 
         [0063]    The input button  35 B is pressed, thereby bringing the switch portion  37 B into the closed state, and the switch portion  37 B electrically connects the second electric signal path to the ground path. In consequence, an electric signal is transmitted from the switch portion  37 B to the power source unit  7 . Further, for example, a high-frequency current is output only from the high-frequency current control portion  9 , and the state is switched to a state where the ultrasonic vibration is not generated. 
         [0064]    As shown in  FIG. 5 , the transducer case  11  further has a fourth conductive portion  43 D extended along the longitudinal axis C. Each of the first conductive portion  43 A, the second conductive portion  43 B and the third conductive portion  43 C is electrically insulated from the fourth conductive portion  43 D. A proximal end portion of the fourth conductive portion  43 D is connected to one end of an electric signal line  48 . The electric signal line  48  is provided in the cable  6 . The other end of the electric signal line  48  is connected to the high-frequency current control portion  9 . In the state where the transducer case  11  is coupled with the fixed handle  22  (the sheath unit  4 ), only a distal end portion of the fourth conductive portion  43 D electrically comes in contact with the cylindrical member  29 . 
         [0065]    As shown in  FIG. 4 , the cylindrical member  29  is connected to one end of an electric signal line  49 . The other end of the electric signal line  49  is connected to the sheath  23 . As described above, the high-frequency current is transmitted from the high-frequency current control portion  9  to the sheath  23  via the electric signal line  48 , the fourth conductive portion  43 D, the cylindrical member  29 , and the electric signal line  49 . 
         [0066]    As shown in  FIG. 6 , the sheath  23  is provided on an outer peripheral direction side to the probe  3 . The sheath  23  has a hollow portion  23   a  into which the probe  3  is inserted, in a state where the first electrode portion  21  that functions as the distal end portion of the probe  3  projects from a distal end portion of the sheath  23 . The sheath  23  functions as a cylindrical member into which the probe  3  is inserted, and is provided along the longitudinal axis C. 
         [0067]    The sheath  23  has an unshown support member that is provided between the probe  3  and the sheath  23  in a radial direction of the sheath  23  to support the probe  3 . The support member is made of an insulating material. The support member prevents the probe  3  from coming in contact with the sheath  23 , and electrically insulates the probe  3  from the sheath  23 . In the present embodiment, the support member is provided at a node position of the ultrasonic vibration. In consequence, the probe  3  is more effectively prevented from coming in contact with the sheath  23 . It is to be noted that the number of the support members may be one or plural, as long as at least one support member is provided. 
         [0068]    [Movable Handle Unit  5 ] 
         [0069]    As shown in  FIG. 1 , the movable handle unit  5  is openable and closable on the fixed side including the probe  3  and the sheath unit  4 , for a treatment operation to treat the treatment object. The movable handle unit  5  has a movable handle  25  that is provided in a proximal end portion of the movable handle unit and that functions as a power point in the treatment operation. The movable handle  25  is openable and closable in an opening/closing direction to the fixed handle  22  along a periaxial opening/closing direction in an opening/closing axis  101  as a center which will be described later. That is, the movable handle  25  rotates around the opening/closing axis  101 . The movable handle  25  has a movable handle ring  26  that functions as a movable side finger placing portion. The movable handle  25  is openable and closable to the fixed handle  22  in the first direction indicating the direction of the arrow A 1  of  FIG. 1  and perpendicular to the longitudinal axis C and the second direction indicating the direction of the arrow A 2  of  FIG. 1  and as an opposite direction to the first direction. The movable handle  25  is positioned on the side of the first direction to the fixed handle  22 . When the movable handle  25  is closed to the fixed side, a central axis C 1  of the movable handle  25  is inclined in a state where the axis has an acute angle α to the longitudinal axis C. 
         [0070]    The movable handle unit  5  further has, for example, the jaw  52  rotatably attached to the distal end portion of the sheath  23 , and a relay member  57  provided between the movable handle  25  and the jaw  52 . The jaw  52  is attached to the sheath  23 , thereby coupling the movable handle unit  5  with the sheath unit  4 . The jaw  52  has the second electrode portion  53  that is provided in a distal end portion of the movable handle unit  5 , functions as an operation point in the treatment operation and functions as a jaw distal end portion. The jaw  52  is attached to the distal end portion of the sheath  23  so that the jaw  52  is rotatable around the opening/closing axis  101 , that the opening/closing axis  101  is as the center. The jaw  52  rotates around opening/closing axis  101  as the center with the opening and closing of the movable handle  25 , whereby the jaw  52  is openable and closable to the first electrode portion  21  that functions as the distal end portion of the probe  3 , in the opening/closing direction which intersect specifically perpendicular to a longitudinal axis direction and an opening/closing axis direction. The jaw  52  including the second electrode portion  53  is openable and closable to the first electrode portion  21 . The second electrode portion  53  is positioned on the side of the second direction (the direction of the arrow A 2  shown in  FIG. 1 ) to the first electrode portion  21 . The second electrode portion  53  is electrically connected to the sheath  23 . The second electrode portion  53  has a probe facing portion  55  that is provided in a part on an outer surface of the second electrode portion  53  (the jaw  52 ) and on the side of the first direction (the direction of the arrow A 1  shown in  FIG. 1 ) and that faces the first electrode portion  21 . Similarly, the first electrode portion  21  has a jaw facing portion  58  that is provided in a part on an outer surface of the first electrode portion  21  and on the side of the second direction (the direction of the arrow A 2  shown in  FIG. 1 ) and that faces the second electrode portion  53 . 
         [0071]    Consequently, the movable handle  25  moves in the first direction, and the movable handle  25  performs an opening operation to the fixed handle  22 , whereby the jaw  52  including the second electrode portion  53  moves in the second direction. In consequence, the jaw  52  including the second electrode portion  53  is at an opening position to the first electrode portion  21 . 
         [0072]    The movable handle  25  moves in the second direction, and the movable handle  25  performs a closing operation to the fixed handle  22 , whereby the jaw  52  including the second electrode portion  53  moves in the first direction. In consequence, the jaw  52  including the second electrode portion  53  is at a closing position to the first electrode portion  21 . 
         [0073]    That is, when the jaw  52  rotates around the opening/closing axis  101  as the center to the sheath  23 , the jaw  52  performs the opening/closing operation at the opening position and the closing position to the first electrode portion  21 . In this way, the movable handle  25  performs the opening/closing operation of the jaw  52 , and is openable and closable to the fixed handle  22 . 
         [0074]    As described above, the second electrode portion  53  is electrically connected to the sheath  23 . Thus, the high-frequency current is transmitted between the sheath  23  and the second electrode portion  53 . The high-frequency current is transmitted between the high-frequency current control portion  9  and the sheath  23  via the electric signal line  48 , the fourth conductive portion  43 D and the electric signal line  49 . Therefore, a jaw side current path is formed from the high-frequency current control portion  9  through the electric signal line  48 , the fourth conductive portion  43 D, the electric signal line  49  and the sheath  23  to the second electrode portion  53  of the jaw  52 . The jaw side current path indicates a path through which the high-frequency current flows. That is, the high-frequency current is transmitted between the high-frequency current control portion  9  and the second electrode portion  53  by the jaw side current path. 
         [0075]    It is to be noted that an outer surface of the sheath  23  and the outer surface of a portion of the jaw  52  other than the probe facing portion  55  are treated with, e.g., an insulating coating. Consequently, even in a case where an operator&#39;s hand or the like comes in contact with the outer surface of the sheath  23  or the outer surface of the jaw  52 , an electric shock is prevented from being received. The relay member  57  between the jaw  52  and the movable handle  25  is made of an insulating material. In consequence, the high-frequency current is prevented from being transmitted from the jaw  52  to the movable handle  25 . 
         [0076]    [Opening/Closing Axis Member  100 ] 
         [0077]    As shown in  FIG. 1  and  FIG. 6 , the treatment device  10  further has an opening/closing axis member  100  that has the opening/closing axis  101  and that attaches the jaw  52  to the sheath  23  so that the jaw  52  rotates around the opening/closing axis, whereby the jaw  52  is openable and closable to the sheath  23 . The opening/closing axis  101  corresponds to a central axis of the opening/closing axis member  100 . The opening/closing axis member  100  including the opening/closing axis  101  may be included in the movable handle unit  5  of the treatment device  10 . 
         [0078]    As shown in  FIG. 1  and  FIG. 6 , an axis that is provided along a perpendicular direction perpendicular to opening/closing directions such as the first direction (the direction of the arrow A 1  shown in  FIG. 1 ) and the second direction (the direction of the arrow A 2  shown in  FIG. 1 ) and a longitudinal axis C direction and that is perpendicular to the longitudinal axis C is defined as a perpendicular axis  201 . The perpendicular direction is the opening/closing axis direction shown in  FIG. 6 . The perpendicular axis  201  is provided along a radial direction of the probe  3  and the radial direction of the sheath  23 . The perpendicular axis  201  intersects the longitudinal axis C and extends through the hollow portion  23   a.    
         [0079]    As shown in  FIG. 1 , the perpendicular axis  201  is provided more forward than, e.g., an intersecting axis  301  in the longitudinal axis C direction. A forward side here refers to the side of the first electrode portion  21  that functions as the distal end portion of the probe  3  in the longitudinal axis C direction. Similarly to the perpendicular axis  201 , the intersecting axis  301  is an axis that is provided along the opening/closing axis direction perpendicular to the opening/closing direction and the longitudinal axis C direction and that is perpendicular to the longitudinal axis C. The intersecting axis  301  intersects the central axis C 1  of the movable handle  25 . 
         [0080]    As shown in  FIG. 1  and  FIG. 6 , the opening/closing axis  101  of the present embodiment is provided to shift from the intersecting axis  301  in the longitudinal axis C direction. For example, the opening/closing axis  101  is provided more forward than the intersecting axis  301  in the longitudinal axis C direction. Further, the opening/closing axis  101  is not provided on the perpendicular axis  201 . The opening/closing axis  101  is provided to shift from the perpendicular axis  201  in the opening/closing direction. Specifically, the opening/closing axis  101  is away from the perpendicular axis  201  in the opening/closing direction, and is provided in parallel with the perpendicular axis  201  in the opening/closing axis direction. In other words, the opening/closing axis  101  is offset to the perpendicular axis  201  in the opening/closing direction. The opening/closing axis  101  is provided on the side of the second direction to the perpendicular axis  201 . Thus, the opening/closing axis  101  does not intersect the perpendicular axis  201 , and does not penetrate the hollow portion  23   a.    
         [0081]    As shown in  FIG. 6 , the opening/closing axis member  100  is provided at a position offset to the hollow portion  23   a  in the opening/closing direction so that the opening/closing axis member  100  does not overlap with the hollow portion  23   a  in the opening/closing direction. In this state, the opening/closing axis member  100  having the opening/closing axis  101  is inserted in the jaw  52  and the sheath  23  so that the opening/closing axis member  100  pierces through (skewers) the sheath  23  and the jaw  52  provided adjacent to each other in the opening/closing axis direction at a position at which the opening/closing axis member  100  is offset to the hollow portion  23   a  in the opening/closing direction. The opening/closing axis member  100  is inserted in, whereby the opening/closing axis member  100  attaches the jaw  52  to the sheath  23 . 
         [0082]    As shown in  FIG. 6 , the treatment device  10  further has a sheath side attaching portion  23   b  that is provided in the sheath  23 , and a jaw side attaching portion  52   b  that is provided in the jaw  52 . The sheath side attaching portion  23   b  and the jaw side attaching portion  52   b  are provided so that one opening/closing axis member  100  pierces through the sheath side attaching portion  23   b  and the jaw side attaching portion  52   b  in the opening/closing axis direction at the position offset to the hollow portion  23   a  in the opening/closing direction. Consequently, the sheath side attaching portion  23   b  and the jaw side attaching portion  52   b  are provided at the positions offset to the hollow portion  23   a  in the opening/closing direction, and are adjacent to each other and further overlapped with each other in the opening/closing axis direction. Consequently, as shown in  FIG. 1 , the opening/closing axis member  100  including the opening/closing axis  101 , the sheath side attaching portion  23   b  and the jaw side attaching portion  52   b  are provided closer to, e.g., a fixed handle  22  side than to a movable handle  25  side in the opening/closing direction. These positions will be described later in detail. 
         [0083]    As shown in  FIG. 6 , the sheath side attaching portion  23   b  has a sheath side through hole portion  23   c  that penetrates the sheath side attaching portion  23   b  in the opening/closing axis direction and is provided away from the hollow portion  23   a  in the opening/closing axis direction and the opening/closing direction. 
         [0084]    As shown in  FIG. 6 , the jaw side attaching portion  52   b  has a jaw side through hole portion  52   c  that penetrates the jaw side attaching portion  52   b  in the opening/closing axis direction and is provided away from the hollow portion  23   a  in the opening/closing axis direction and the opening/closing direction. 
         [0085]    As shown in  FIG. 6 , in the present embodiment, when the jaw  52  is attached to the sheath  23 , the one opening/closing axis member  100  is inserted in the sheath side through hole portion  23   c  and the jaw side through hole portion  52   c  in a state where the jaw side through hole portion  52   c  communicates with the sheath side through hole portion  23   c  in the opening/closing axis direction. The one opening/closing axis member  100  attaches the jaw  52  to the sheath  23  so that the jaw  52  is made openable and closable to the sheath  23  by inserting the one opening/closing axis member  100  in the sheath side through hole portion  23   c  and the jaw side through hole portion  52   c . In the opening/closing axis direction, each end face of the opening/closing axis member  100  is provided on the same flat surface as the outer peripheral surface of the jaw side attaching portion  52   b . That is, in the opening/closing axis direction, both end portions of the opening/closing axis member  100  do not project from the jaw side attaching portion  52   b . In the present embodiment, the opening/closing axis member  100  is only inserted in the sheath side through hole portion  23   c  and the jaw side through hole portion  52   c.    
         [0086]    Here, as shown in  FIG. 6 , a diameter of the hollow portion  23   a  of the sheath  23  is defined as D1, 
         [0087]    a diameter of the sheath side through hole portion  23   c  is defined as D2, 
         [0088]    a distance between a central position of the hollow portion  23   a  and the sheath side through hole portion  23   c  in the opening/closing direction is defined as L1, 
         [0089]    the offset is taken into consideration in the above definitions, and then Equation (1) is established as follows: 
         [0000]      ( D 1+ D 2)/2&lt; L 1  Equation (1).
 
         [0090]    In the above description, L1 corresponds to a distance between the perpendicular axis  201  and the opening/closing axis  101  in the opening/closing direction. 
         [0091]    According to Equation (1), the sheath side through hole portion  23   c , the jaw side through hole portion  52   c  and the opening/closing axis member  100  are securely offset to the hollow portion  23   a  in the opening/closing direction. As shown in  FIG. 6 , the opening/closing axis member  100  including the opening/closing axis  101  is not provided on the perpendicular axis  201 , and is not inserted in the hollow portion  23   a.    
         [0092]    The opening/closing axis member  100  is not fixed to, e.g., both of the sheath side attaching portion  23   b  and the jaw side attaching portion  52   b , or is fixed to one of the sheath side attaching portion  23   b  and the jaw side attaching portion  52   b . That is, the opening/closing axis member  100  is not fixed to at least one of the sheath side attaching portion  23   b  and the jaw side attaching portion  52   b.    
         [0093]    In a case where the opening/closing axis member  100  is not fixed to both of the sheath side attaching portion  23   b  and the jaw side attaching portion  52   b , the jaw side attaching portion  52   b  and the jaw  52  are rotatable to the opening/closing axis member  100 , the sheath side attaching portion  23   b  and the sheath  23  around the opening/closing axis. 
         [0094]    In a case where the opening/closing axis member  100  is fixed to the sheath side attaching portion  23   b  and is not fixed to the jaw side attaching portion  52   b , the jaw side attaching portion  52   b  and the jaw  52  are rotatable to the opening/closing axis member  100 , the sheath side attaching portion  23   b  and the sheath  23  around the opening/closing axis. 
         [0095]    In a case where the opening/closing axis member  100  is not fixed to the sheath side attaching portion  23   b  and is fixed to the jaw side attaching portion  52   b , the jaw side attaching portion  52   b , the jaw  52  and the opening/closing axis member  100  are integrally rotatable to the sheath side attaching portion  23   b  and the sheath  23  around the opening/closing axis. 
         [0096]    As described above and as shown in  FIG. 1  and  FIG. 6 , the jaw  52  is attached to the sheath  23  by the one opening/closing axis member  100  so that the jaw  52  is rotatable by the sheath side attaching portion  23   b , the jaw side attaching portion  52   b  and the one opening/closing axis member  100  around the opening/closing axis. 
         [0097]    In this way, the opening/closing axis member  100  having the opening/closing axis  101 , the sheath side attaching portion  23   b  having the sheath side through hole portion  23   c  and the jaw side attaching portion  52   b  having the jaw side through hole portion  52   c  function as attaching portions that attach the jaw  52  to the sheath  23 . This attaching portion attaches the movable handle unit  5  to the fixed side so that the movable handle unit  5  is rotatable around the opening/closing axis. 
         [0098]    This attaching portion functions as an electric contact unit that is provided between the sheath  23  and the jaw  52 , and that holds a state where the high-frequency current is always transmitted between the sheath  23  and the second electrode portion of the jaw  52 . In the opening/closing axis member  100  inserted in the sheath side through hole portion  23   c  and the jaw side through hole portion  52   c , for example, the outer peripheral surface of the opening/closing axis member  100  comes in contact with the inner peripheral surface of the sheath side attaching portion  23   b  and the inner peripheral surface of the jaw side attaching portion  52   b , whereby the high-frequency current is transmitted between the sheath  23  and the second electrode portion of the jaw  52 . 
         [0099]    It is to be noted that an exposed portion of the opening/closing axis member  100  which is exposed out from the sheath side attaching portion  23   b  and the jaw side attaching portion  52   b , an outer surface of the sheath side attaching portion  23   b  and an outer surface of the jaw side attaching portion  52   b  are subjected to, e.g., an insulating coating treatment. Consequently, even in a case where the operator&#39;s hand or the like comes in contact with these parts, an electric shock is prevented from being received. 
         [0100]    [Sheath Side Attaching Portion  23   b]   
         [0101]    As shown in  FIG. 6 , as one example of a position of the sheath side attaching portion  23   b , the sheath side attaching portion  23   b  is provided on the same axis as in, e.g., the hollow portion  23   a  of the sheath  23  into which the probe  3  is inserted, in the opening/closing direction. The sheath side attaching portion  23   b  is provided on, e.g., a lower side of the hollow portion  23   a  in the opening/closing direction. In this case, the sheath side attaching portion  23   b  is formed by, e.g., a thick portion of the sheath  23  that extends from the longitudinal axis C toward the second direction in the opening/closing direction. In this way, the sheath side attaching portion  23   b  is provided on the fixed handle  22  side in the opening/closing direction. The sheath side attaching portion  23   b  is preferably provided in, e.g., a part of the distal end portion of the sheath  23 . In this way, the sheath side attaching portion  23   b  of the present embodiment is, e.g., a part of the sheath  23  and is integral with the sheath  23 . 
         [0102]    As shown in  FIG. 6  and as described above, the sheath side through hole portion  23   c  does not communicate with the hollow portion  23   a , and is separated from the hollow portion  23   a  in the opening/closing axis direction and the opening/closing direction. The sheath side through hole portion  23   c  is provided to be offset so that the sheath side through hole portion  23   c  does not overlap with the hollow portion  23   a  in the opening/closing direction. In this way, the thick portion of the sheath side attaching portion  23   b  is interposed between the hollow portion  23   a  and the sheath side through hole portion  23   c . The sheath side through hole portion  23   c  is provided on, e.g., the lower side of the hollow portion  23   a  in the opening/closing direction, and provided closer to, e.g., the fixed handle  22  side than to the movable handle  25  side. 
         [0103]    [Jaw Side Attaching Portion  52   b]   
         [0104]    As shown in  FIG. 6 , the jaw side attaching portion  52   b  is a part of the jaw  52 , and a pair of jaw side attaching portions are provided. The jaw side attaching portions  52   b  are provided on both sides of the sheath side attaching portion  23   b  to sandwich the sheath side attaching portion  23   b  therebetween in the opening/closing axis direction. Specifically, the jaw side attaching portions  52   b  sandwich a pair of side surface portions provided on both the sides of the sheath side attaching portion  23   b  in the opening/closing axis direction. The jaw side attaching portions  52   b  sandwich the sheath side attaching portion  23   b  therebetween so that the jaw side through hole portion  52   c  communicates with the sheath side through hole portion  23   c  in the opening/closing axis direction. For example, the jaw side attaching portions  52   b  are formed by providing a through hole portion  59  (see  FIG. 9A ) in the jaw  52  which will be described later. The jaw side attaching portions  52   b  function as a pair of arm portions of the jaw  52  which are formed by providing the through hole portion  59 . In other words, the jaw  52  is divided into two sections by the through hole portion  59 . The through hole portion  59  penetrates the jaw  52  in the longitudinal axis C direction. The through hole portion  59  is interposed between the jaw side attaching portions  52   b  in the opening/closing axis direction. The sheath  23  is insertable into the through hole portion  59 . 
         [0105]    As shown in  FIG. 6  and as described above, similarly to the sheath side through hole portion  23   c , the jaw side through hole portion  52   c  does not communicate with the hollow portion  23   a , and is separated from the hollow portion  23   a  in the opening/closing axis direction and the opening/closing direction. The sheath side through hole portion  23   c  is provided to be offset so that the sheath side through hole portion does not overlap with the hollow portion  23   a  in the opening/closing direction. In this way, between the hollow portion  23   a  and the jaw side through hole portion  52   c , there are interposed the thick portion of the sheath side attaching portion  23   b , a thick portion of the jaw side attaching portion  52   b , and a thick portion of the sheath  23 . The jaw side through hole portion  52   c  is provided on, e.g., the lower side than the hollow portion  23   a , and provided closer to, e.g., the fixed handle  22  side than to the movable handle  25  side in the opening/closing direction. 
         [0106]    [Operation] 
         [0107]    As shown in  FIG. 6 , the jaw side attaching portions  52   b  sandwich the sheath side attaching portion  23   b  so that the jaw side through hole portion  52   c  communicates with the sheath side through hole portion  23   c  in the opening/closing axis direction. At this time, the sheath side through hole portion  23   c  and the jaw side through hole portion  52   c  are provided at positions offset to the hollow portion  23   a  in the opening/closing direction and provided, e.g., adjacent to each other in the opening/closing axis direction. 
         [0108]    In this state, as shown in  FIG. 6 , the sheath side through hole portion  23   c  and the jaw side through hole portion  52   c  do not communicate with the hollow portion  23   a  in the opening/closing axis direction and the opening/closing direction, and are offset to the hollow portion  23   a  so that the through hole portions do not overlap with the hollow portion  23   a  in the opening/closing direction. 
         [0109]    As shown in  FIG. 6 , the one opening/closing axis member  100  is inserted in the sheath side through hole portion  23   c  and the jaw side through hole portion  52   c  so that the one opening/closing axis member  100  pierces through (skewers) the sheath side attaching portion  23   b  and the jaw side attaching portion  52   b.    
         [0110]    Consequently, as shown in  FIG. 6 , the one opening/closing axis member  100  is not provided on the perpendicular axis  201 , and is provided at the position offset to the hollow portion  23   a  in the opening/closing direction. The one opening/closing axis member  100  attaches the jaw  52  to the sheath  23  at the offset position. The one opening/closing axis member  100  is not inserted in the hollow portion  23   a.    
         [0111]    As shown in  FIG. 6  and as described above, the jaw  52  does not communicate with the hollow portion  23   a  in the opening/closing axis direction and the opening/closing direction, and the jaw  52  is attached to the sheath  23  by the one opening/closing axis member  100  at the position offset to the hollow portion  23   a  in the opening/closing direction. At this time, the jaw  52  is attached to the sheath  23  by the one opening/closing axis member  100 , to be rotatable around the opening/closing axis. 
         [0112]    [Effect] 
         [0113]    Consequently, in the present embodiment, the one opening/closing axis member  100  is provided at the position offset to the hollow portion  23   a  in the opening/closing direction. At this time, the one opening/closing axis member  100  does not overlap with the hollow portion  23   a  and does not penetrate the hollow portion  23   a . The one opening/closing axis member  100  attaches the jaw  52  to the sheath  23  at the offset position. 
         [0114]    In the present embodiment, a pair of opening/closing axis members  100  are not provided, i.e., it does not follow that one opening/closing axis member  100  is inserted in the sheath side through hole portion  23   c  and one jaw side through hole portion  52   c  and that the other opening/closing axis member  100  is inserted in the sheath side through hole portion  23   c  and the other jaw side through hole portion  52   c . In the present embodiment, the opening/closing axis member  100  pierces through the sheath side attaching portion  23   b  and the jaw side attaching portion  52   b  so that the one opening/closing axis member  100  is inserted in the one jaw side through hole portion  52   c , the sheath side attaching portion  23   b  and the other jaw side through hole portion  52   c.    
         [0115]    Therefore, in the present embodiment, the number of components for the attaching can be minimized, and the opening/closing axis  101  can highly accurately be provided. In the present embodiment, an attaching configuration can be simplified, and generation of looseness in the attaching portion between the jaw  52  and the sheath  23  can be prevented. In the present embodiment, even when a shape error of a product itself is large, the generation of the looseness in the attaching portion between the jaw  52  and the sheath  23  can be prevented. 
         [0116]    In the present embodiment, as described above, a relative position between the distal end portion of the probe  3  and the distal end portion of the jaw  52  can be prevented from shifting, and in this state, a meshing accuracy can be prevented from being deteriorated in meshing of the distal end portion of the probe  3  and the distal end portion of the jaw  52  with each other. Therefore, according to the present embodiment, in treatment operations such as a grasping operation and a peeling operation, treatment forces such as a grasping force and a peeling force can be prevented from being deteriorated, and desirable treatment characteristics can securely be obtained. 
         [0117]    In the present embodiment, it is possible to obtain an operation feeling of the treatment device  10  similar to that of the treatment device  10  of such a type that the opening/closing axis  101  crosses the longitudinal axis C similarly to the perpendicular axis  201 . In other words, according to the present embodiment, the opening/closing axis  101  is offset, but it is possible to obtain the operation feeling that is not different from that in a conventional treatment device. 
         [0118]    In the present embodiment, when the jaw  52  is attached to the sheath  23 , the sheath side through hole portion  23   c  and the jaw side through hole portion  52   c  communicate with each other. Therefore, in the present embodiment, the opening/closing axis member  100  can easily be inserted into and pulled out from the sheath  23  and the jaw  52 , and attaching and detaching can easily be performed. 
         [0119]    In the present embodiment, the offset can securely be performed by (D1+D2)/2&lt;L1. In the present embodiment, by (D1+D2)/2&lt;L1, a body fluid or the like that has permeated into the hollow portion  23   a  during the treatment operation can securely be prevented from leaking to the outside of the treatment device  10  via the sheath side through hole portion  23   c  and the jaw side through hole portion  52   c.    
         [0120]    In the present embodiment, the opening/closing axis member  100  is inserted in the sheath side attaching portion  23   b  as a part of the sheath  23  and the jaw side attaching portion  52   b  as a part of the jaw  52 . Consequently, in the present embodiment, for the attaching, the opening/closing axis member  100 , the sheath side through hole portion  23   c  and the jaw side through hole portion  52   c  need only be prepared. Therefore, in the present embodiment, the number of the components for the attaching can be decreased. 
         [0121]    It is to be noted that in the present embodiment, as shown in  FIG. 6 , the sheath side through hole portion  23   c  is provided on, e.g., the lower side of the hollow portion  23   a  in the opening/closing direction, and provided on the fixed handle  22  side. The opening/closing axis member  100  having the opening/closing axis  101  and the jaw side through hole portion  52   c  are provided on, e.g., the side lower than the hollow portion  23   a  and provided closer to, e.g., the fixed handle  22  side than to the movable handle  25  side in the opening/closing direction. In other words, the opening/closing axis member  100 , the sheath side through hole portion  23   c  and the jaw side through hole portion  52   c  are provided between, e.g., the hollow portion  23   a  including the longitudinal axis C and the fixed handle ring  28  in the opening/closing direction. However, when the opening/closing axis member  100 , the sheath side through hole portion  23   c  and the jaw side through hole portion  52   c  are provided at the positions offset to the hollow portion  23   a  in the opening/closing direction, these positions do not have to be limited to those in this example. 
         [0122]    For example, as shown in  FIG. 7A  and  FIG. 7B , the sheath side attaching portion  23   b  may be provided on, e.g., a side higher than the hollow portion  23   a  and provided closer to, e.g., the movable handle  25  side than to the fixed handle  22  side in the opening/closing direction. In consequence, the sheath side through hole portion  23   c  is provided on, e.g., the side higher than the hollow portion  23   a  and provided closer to, e.g., the movable handle  25  side than to the fixed handle  22  side. The opening/closing axis member  100  and the jaw side through hole portion  52   c  are provided on, e.g., the higher side than the hollow portion  23   a  and provided closer to, e.g., the movable handle  25  side than to the fixed handle  22  side in the opening/closing direction. In other words, the opening/closing axis member  100 , the sheath side through hole portion  23   c  and the jaw side through hole portion  52   c  are provided between, e.g., the hollow portion  23   a  including the longitudinal axis C and the movable handle  25  in the opening/closing direction. 
         [0123]    In the present embodiment, the opening/closing axis  101  is provided more forward than the intersecting axis  301  in the longitudinal axis C direction, but the present invention does not have to be limited to this example. There is no special restriction on an axial position of the opening/closing axis  101  to the intersecting axis  301  in the longitudinal axis C direction. 
         [0124]    In the present embodiment, the sheath side attaching portion  23   b  is integral with the sheath  23 , but the present invention does not have to be limited to this example. The sheath side attaching portion  23   b  may be a separate member from the sheath  23 . In this case, the sheath side attaching portion  23   b  may be attached to the outer peripheral surface of the distal end portion of the sheath  23  by, e.g., adhesive bonding, welding or the like. 
         [0125]    In the present embodiment, the jaw side attaching portions  52   b  sandwich the sheath side attaching portion  23   b  therebetween, but the present invention is not limited to this example. For example, the sheath side attaching portions  23   b  may sandwich the jaw side attaching portion  52   b  therebetween. Thus, in the opening/closing axis direction, one of the sheath side attaching portion  23   b  and the jaw side attaching portion  52   b  may sandwich the other portion so that the sheath side through hole portion  23   c  communicates with the jaw side through hole portion  52   c  and the sheath side attaching portion  23   b  and the jaw side attaching portion  52   b  are superimposed on each other. 
         [0126]    In the present embodiment, when the opening/closing axis member  100  is provided so that the opening/closing axis member  100  pierces into the sheath side attaching portion  23   b  and the jaw side attaching portion  52   b , a configuration of the sheath side attaching portion  23   b  and the jaw side attaching portion  52   b  does not have to be limited to the abovementioned sandwiching configuration. For example, the sheath side attaching portion  23   b  and the jaw side attaching portion  52   b  may be provided in parallel with each other in the opening/closing axis direction, as long as the opening/closing axis member  100  is provided so that the opening/closing axis member  100  pierces through the sheath side attaching portion  23   b  and the jaw side attaching portion  52   b . That is, in the opening/closing axis direction, an unshown member may be interposed between the sheath side attaching portion  23   b  and the jaw side attaching portion  52   b , or the sheath side attaching portion  23   b  and the jaw side attaching portion  52   b  may be provided away from each other. In the opening/closing axis direction, the sheath side attaching portion  23   b  may be sandwiched between the jaw side attaching portions  52   b , may be interposed between the jaw side attaching portions  52   b , may come in contact closely with the jaw side attaching portions  52   b , or may be separated from the jaw side attaching portions  52   b.    
         [0127]    As shown in  FIG. 8A , the treatment device  10  may further have preventing members  103  that prevent the opening/closing axis member  100  from falling out from the sheath side through hole portion  23   c  and the jaw side through hole portion  52   c . The preventing members  103  are fitted into, e.g., the respective jaw side through hole portions  52   c . In this case, a pair of preventing members  103  sandwich the opening/closing axis member  100  therebetween in the opening/closing axis direction. The preventing members  103  are separate members from each other. 
         [0128]    As shown in  FIG. 8A , the opening/closing axis member  100  is inserted in the sheath side through hole portion  23   c  and the jaw side through hole portion  52   c , and further, the preventing members  103  are fitted into the jaw side through hole portions  52   c . In the opening/closing axis direction, the preventing members  103  are provided on the same flat surface as the outer peripheral surfaces of the jaw side attaching portions  52   b . That is, in the opening/closing axis direction, the preventing members  103  do not project from the jaw side attaching portions  52   b.    
         [0129]    The opening/closing axis member  100  is an axial member, and the preventing member  103  is a rod member thicker than the opening/closing axis member  100  and functions as a cap. 
         [0130]    As shown in  FIG. 8A , the jaw side through hole portion  52   c  has a convex shape, and has a first hole portion  52   d  in which the opening/closing axis member  100  is inserted, and a second hole portion  52   e  in which the preventing member  103  is inserted. In the opening/closing axis direction, the first hole portion  52   d  communicates with the second hole portion  52   e  and the sheath side through hole portion  23   c . A diameter of the first hole portion  52   d  is the same as a diameter of the opening/closing axis member  100  and the diameter of the sheath side through hole portion  23   c , and smaller than a diameter of the preventing member  103  and a diameter of the second hole portion  52   e . The diameter of the second hole portion  52   e  is the same as the diameter of the preventing member  103 . In the opening/closing axis direction, the second hole portion  52   e  is provided on an outer side of the first hole portion  52   d.    
         [0131]    As shown in  FIG. 8A , the preventing members  103  are fitted into the jaw side through hole portions  52   c , and hence the opening/closing axis member  100  can be prevented from falling out from the sheath side through hole portion  23   c  and the jaw side through hole portion  52   c  by the preventing members  103 . 
         [0132]    It is to be noted that the opening/closing axis member  100  is made of, e.g., a hard material. This material is, for example, a metal or a resin. 
         [0133]    In a case where the opening/closing axis member  100  is made of, e.g., a conductive material, the preventing members  103  may be made of an insulating material. In this case, the preventing members  103  are made of a rubber, a ceramic material, a hard resin or the like. In consequence, even when the high-frequency current flows through the jaw  52 , the high-frequency current can be prevented from flowing outside via the opening/closing axis member  100 . 
         [0134]    As shown in  FIG. 8B , the preventing members  103  may cover the outer peripheral surfaces of the jaw side attaching portions  52   b  including end faces of the opening/closing axis member  100 . 
         [0135]    As shown in  FIG. 8A  and  FIG. 8B , an outer diameter of the opening/closing axis member  100  is uniform, but the present invention is not limited to this example. As shown in  FIG. 6 , the outer diameter of the opening/closing axis member  100  may change so that the opening/closing axis member  100  has stepped portions. The shape of the jaw side through hole portion  52   c  may be suitably changed in accordance with a shape of the opening/closing axis member  100 . 
       Second Embodiment 
       [0136]    [Configuration] 
         [0137]    Only aspects that differ from the first embodiment will be described next, with reference to  FIG. 9A ,  FIG. 9B  and  FIG. 9C . The present embodiment corresponds to a configuration shown in  FIG. 1  and  FIG. 6 . 
         [0138]    As shown in  FIG. 9A ,  FIG. 9B  and  FIG. 9C , a treatment device  10  further has a regulating mechanism  150  that regulates an opening/closing angle of a jaw  52  to a sheath  23 . 
         [0139]    The regulating mechanism  150  has the sheath  23  into which a through hole portion  59  to be provided in the jaw  52  is inserted, and a projecting portion  151  provided on an outer peripheral surface of the sheath  23  to project toward an outer side of the sheath  23  in a radial direction of the sheath  23 . The regulating mechanism  150  further has an inner peripheral surface  59   a  of the through hole portion  59  which abuts on the outer peripheral surface of the sheath  23  when a movable handle unit  5  including the jaw  52  closes to a fixed side as shown in  FIG. 9B , and which abuts on the projecting portion  151  when the movable handle unit  5  including the jaw  52  opens to the fixed side as shown in  FIG. 9C . 
         [0140]    As shown in  FIG. 9B  and  FIG. 9C , the projecting portion  151  is provided on the side of a first direction. Specifically, the projecting portion  151  is provided on an upper surface of the sheath  23  which faces the movable handle unit  5 . The projecting portion  151  is provided on the side opposite to an opening/closing axis member  100  via the sheath  23  in an opening/closing direction. The projecting portion  151  is formed by projecting a part of the sheath  23  toward the outer side of the sheath  23  in the radial direction of the sheath  23 . Thus, the projecting portion  151  is integral with the sheath  23 . It is to be noted that the projecting portion  151  may be a separate body from the sheath  23 . 
         [0141]    As shown in  FIG. 9B  and  FIG. 9C , in the through hole portion  59  including the inner peripheral surface  59   a , a relative position of the through hole portion  59  to the projecting portion  151  and the sheath  23  changes in accordance with an opening/closing operation of the movable handle unit  5 . 
         [0142]    As shown in  FIG. 9B  and  FIG. 9C , the inner peripheral surface  59   a  of the through hole portion  59  has a first abutment region  59   b  that abuts on the outer peripheral surface of the sheath  23  so that a probe facing portion  55  abuts on a jaw facing portion  58  when the movable handle unit  5  closes to the fixed side, and a second abutment region  59   c  that abuts on the projecting portion  151  when the movable handle unit  5  opens to the fixed side. 
         [0143]    As shown in  FIG. 9B  and  FIG. 9C , the first abutment region  59   b  and the second abutment region  59   c  are provided on the side opposite to the opening/closing axis member  100  via the sheath  23  in the opening/closing direction. The first abutment region  59   b  is provided on a lower surface side of the jaw  52 , and the second abutment region  59   c  is provided on an upper surface side of the jaw  52 . This lower surface of the jaw  52  is a surface reverse to the upper surface of the jaw  52 , and faces the sheath  23 . The first abutment region  59   b  and the second abutment region  59   c  are provided in a proximal end portion of the through hole portion  59 . The first abutment region  59   b  includes an inner peripheral edge portion on the lower surface side of the jaw  52 , and the second abutment region  59   c  includes an inner peripheral edge portion on the upper surface side of the jaw  52 . The outer peripheral surface of the sheath  23  on which the first abutment region  59   b  abuts is an upper surface portion of the sheath  23  which faces the movable handle unit  5 . The outer peripheral surface of the sheath  23  on which the first abutment region  59   b  abuts is provided on the same straight line as that of the projecting portion  151  in a longitudinal axis C direction. As shown in  FIG. 9B , in a state where the movable handle unit  5  is closed, the inner peripheral surface  59   a  is inclined in the longitudinal axis C direction so that the second abutment region  59   c  is positioned more forward than the first abutment region  59   b.    
         [0144]    [Operation] 
         [0145]    As shown in  FIG. 9B , when the movable handle unit  5  is closed to the fixed side, the first abutment region  59   b  abuts on the outer peripheral surface of the sheath  23 . In consequence, the probe facing portion  55  abuts on the jaw facing portion  58 , and an opening/closing angle α of the movable handle unit  5  to the fixed side is regulated so that the opening/closing angle α is minimize. The outer peripheral surface of the sheath  23  functions as a stopper that prevents the movable handle unit  5  from being closed more than necessary. When the first abutment region  59   b  abuts on the outer peripheral surface of the sheath  23 , a minimum closing position of the movable handle unit  5  is determined. 
         [0146]    As shown in  FIG. 9C , when the movable handle unit  5  is opened to the fixed side, the second abutment region  59   c  abuts on the projecting portion  151 . In consequence, the probe facing portion  55  opens to the jaw facing portion  58 , and the opening/closing angle α of the movable handle unit  5  to the fixed side is regulated so that the opening/closing angle α is maximize. The projecting portion  151  functions as a stopper that prevents the movable handle unit  5  from being opened more than necessary. When the second abutment region  59   c  abuts on the projecting portion  151 , a maximum opening position of the movable handle unit  5  is determined. 
         [0147]    In this way, the first abutment region  59   b  abuts on the outer peripheral surface of the sheath  23  and the second abutment region  59   c  abuts on the projecting portion  151 , whereby the opening/closing angle α of the movable handle unit  5  to the fixed side is regulated. Furthermore, the movable handle unit  5  is prevented from being opened or closed more than necessary, and the opening/closing position of the movable handle unit  5  to the fixed side is determined. Such regulating and positioning are performed in conjunction with a rotating operation of the movable handle unit  5 . 
         [0148]    [Effect] 
         [0149]    In the present embodiment, by the sheath  23 , the projecting portion  151 , the first abutment region  59   b  and the second abutment region  59   c  as the regulating mechanism  150 , the opening/closing angle α of the movable handle unit  5  to the fixed side can be regulated, the movable handle unit  5  can be prevented from being opened or closed more than necessary, and the opening/closing position of the movable handle unit  5  to the fixed side can be determined. 
         [0150]    In the present embodiment, the regulating mechanism  150  has the sheath  23 , the projecting portion  151 , the first abutment region  59   b  and the second abutment region  59   c , but when the regulating and the positioning are performed in conjunction with the rotating operation of the movable handle unit  5 , configuration members of the regulating mechanism  150  are not limited to these members. 
         [0151]    [Modification of Second Embodiment] 
         [0152]    [Configuration] 
         [0153]    Only aspects different from the first and second embodiments will be described next, with reference to  FIG. 10A ,  FIG. 10B  and  FIG. 10C . The present embodiment corresponds to a configuration shown in  FIG. 7A  and  FIG. 7B . 
         [0154]    A projecting portion  151  is provided more forward than an opening/closing axis member  100  in a longitudinal axis C direction. 
         [0155]    As shown in  FIG. 10B  and  FIG. 10C , a first abutment region  59   b  and a second abutment region  59   c  are provided around the opening/closing axis member  100  so that the first abutment region  59   b  and the second abutment region  59   c  are adjacent to the opening/closing axis member  100 . Specifically, the first abutment region  59   b  and the second abutment region  59   c  are provided between the opening/closing axis member  100  and the projecting portion  151  in the longitudinal axis C direction. 
         [0156]    As shown in  FIG. 10B  and  FIG. 10C , an inner peripheral surface  59   a  further has a third abutment region  59   d  that abuts on an outer peripheral surface of a sheath  23  when a movable handle unit  5  opens to a fixed side and the second abutment region  59   c  accordingly abuts on the projecting portion  151 . 
         [0157]    As shown in  FIG. 10B  and  FIG. 10C , the third abutment region  59   d  is provided on a side opposite to the first abutment region  59   b  via a through hole portion  59  in an opening/closing direction. The third abutment region  59   d  is provided in a distal end portion of the through hole portion  59 . The third abutment region  59   d  includes an inner peripheral edge portion on a lower surface side of a jaw  52 . The outer peripheral surface of the sheath  23  on which the third abutment region  59   d  abuts is a lower surface portion of the sheath  23  on a side opposite to an upper surface portion of the sheath  23 . 
         [0158]    [Operation] 
         [0159]    As shown in  FIG. 10B , when the movable handle unit  5  is closed to the fixed side, the first abutment region  59   b  abuts on the outer peripheral surface of the sheath  23 . In consequence, a probe facing portion  55  abuts on a jaw facing portion  58 , and an opening/closing angle α of the movable handle unit  5  to the fixed side is regulated so that the opening/closing angle α is minimize. The outer peripheral surface of the sheath  23  functions as a stopper that prevents the movable handle unit  5  from being closed more than necessary. When the first abutment region  59   b  abuts on the outer peripheral surface of the sheath  23 , a minimum closing position of the movable handle unit  5  is determined. 
         [0160]    As shown in  FIG. 10C , when the movable handle unit  5  is opened to the fixed side, the second abutment region  59   c  abuts on the projecting portion  151 , and simultaneously the third abutment region  59   d  abuts on the outer peripheral surface of the sheath  23 . In consequence, the probe facing portion  55  opens to the jaw facing portion  58 , and an opening/closing angle α of the movable handle unit  5  to the fixed side is regulated so that the opening/closing angle α is maximize. The projecting portion  151  and the outer peripheral surface of the sheath  23  function as a stopper that prevents the movable handle unit  5  from being opened more than necessary. When the second abutment region  59   c  abuts on the projecting portion  151  and the third abutment region  59   d  abuts on the outer peripheral surface of the sheath  23 , a maximum opening position of the movable handle unit  5  is determined. 
         [0161]    In this way, the first abutment region  59   b  abuts on the outer peripheral surface of the sheath  23 , the second abutment region  59   c  abuts on the projecting portion  151  and the third abutment region  59   d  abuts on the outer peripheral surface of the sheath  23 , whereby the opening/closing angle α of the movable handle unit  5  to the fixed side is regulated. Furthermore, the movable handle unit  5  is prevented from being opened or closed more than necessary, and the opening/closing position of the movable handle unit  5  to the fixed side is determined. Such regulating and positioning are performed in conjunction with a rotating operation of the movable handle unit  5 . 
         [0162]    [Effect] 
         [0163]    In the present modification, by the sheath  23 , the projecting portion  151 , the first abutment region  59   b , the second abutment region  59   c  and the third abutment region  59   d  as a regulating mechanism  150 , the opening/closing angle α of the movable handle unit  5  to the fixed side can be regulated, the movable handle unit  5  can be prevented from being opened or closed more than necessary, and the opening/closing position of the movable handle unit  5  to the fixed side can be determined. 
         [0164]    In the present modification, the regulating mechanism  150  has the sheath  23 , the projecting portion  151 , the first abutment region  59   b , the second abutment region  59   c , and the third abutment region  59   d , but configuration members of the regulating mechanism  150  are not limited to these members, as long as the regulating and the positioning are performed in conjunction with the rotating operation of the movable handle unit  5 . 
         [0165]    The present invention is not limited to the above embodiments, and constituent elements can be modified to embody the present invention at the stage of implementation without departing from the gist of the invention. Various inventions can be formed by suitably combining the constituent elements disclosed in the above embodiments.