Instrument for endoscope

Abstract

An instrument for an endoscope includes a first insertion portion having an base end to which an operation section is connected; an first offset portion extending outward from an axis of the first insertion portion; a second insertion portion having a base end joined to the first offset portion and an element extending parallel to the axis of the first insertion portion; a second offset portion which is joined to a head of the second insertion portion and reaches an extension of the axis of the first insertion portion; a third insertion portion which is joined to the second offset portion and has a portion arranged on an axis which is substantially the same as at least a part of the axis of the first insertion portion; and an inner hole formed through the first insertion portion, the first offset portion, the second insertion portion, the second offset portion, and the third insertion portion.

1 . An instrument for an endoscope, comprising: 
 a first insertion portion having an base end portion to which an operation section is connected;    an first offset portion extending outward from an axis of the first insertion portion;    a second insertion portion having a base end portion joined to the first offset portion and an element extending parallel to the axis of the first insertion portion;    a second offset portion which is joined to a head portion of the second insertion portion and reaches an extension of the axis of the first insertion portion;    a third insertion portion which is joined to the second offset portion and has a portion arranged on an axis which is substantially the same as at least a part of the axis of the first insertion portion; and    an inner hole formed through the first insertion portion, the first offset portion, the second insertion portion, the second offset portion, and the third insertion portion.    
     
     
         2 . The instrument for an endoscope according to  claim 1 , wherein the second insertion portion and the second offset portion are coupled to each other in a freely rotatable form, and the second offset portion and the third insertion portion are coupled to each other in a freely rotatable form.  
     
     
         3 . The instrument for an endoscope according to  claim 1 , wherein the second offset portion is freely capable of expansion and contraction in a direction substantially perpendicular to the axis of the first insertion portion.  
     
     
         4 . The instrument for an endoscope according to  claim 2 , wherein the first insertion portion and the first offset portion are coupled to each other in a freely rotatable form, the first offset portion and the second insertion portion are coupled to each other in a freely rotatable form, and the second offset portion is arranged parallel to the first offset portion.  
     
     
         5 . The instrument for an endoscope according to  claim 1 , wherein the second insertion portion has a length greater than that of a passage for connecting the inside and the outside of a coelom.  
     
     
         6 . The instrument for an endoscope according to  claim 1 , wherein a clipping member which can be freely opened and closed is provided at a head portion of the third insertion portion, the operation section is provided at the base end portion of the first insertion portion, and a driving force transmitting member is inserted through the inner hole so as to connect the operation section and the clipping member.  
     
     
         7 . The instrument for an endoscope according to  claim 1 , wherein an imaging device is provided at a head of the third insertion portion, and a video cable for the imaging device is pulled out from the base end portion of the first insertion portion.  
     
     
         8 . The instrument for an endoscope according to  claim 1 , wherein a treatment tool for performing treatment on a living body is inserted into the inner hole.  
     
     
         9 . The instrument for an endoscope according to  claim 2 , wherein the first offset portion and the second offset portion move together in a manner such that a variation in a distance from a joint between the second insertion portion and the second offset portion to an extension of the axis of the first insertion portion coincides with a variation in a distance from a joint between the second insertion portion and the first offset portion to the axis or an extension thereof of the first insertion portion or an extension.  
     
     
         10 . The instrument for an endoscope according to  claim 3 , wherein the first offset portion and the second offset portion move together in a manner such that a variation in a distance from a joint between the second insertion portion and the second offset portion to an extension of the axis of the first insertion portion coincides with a variation in a distance from a joint between the second insertion portion and the first offset portion to the axis or an extension thereof of the first insertion portion or an extension.