Endoscopic treatment tool

Abstract

An endoscopic treatment tool, includes an elongated member having a distal end and a proximal end; a braid disposed between the distal end and the proximal end of the elongated member; a distal indicator disposed on the elongated member between a distal end and a proximal end of the braid, the distal indicator extending along a longitudinal axis of the elongated member; a proximal indicator disposed between the distal end and the proximal end of the braid on the elongated member at a more proximal side of the elongated member than the distal indicator, the proximal indicator extending along the longitudinal axis; and a pre-curved shape portion formed in a curved shape, wherein each of the distal indicator and the proximal indicator has a width less than half of an outer circumferential surface of the elongated member in a circumferential direction of the elongated member, respectively.

What is claimed is: 
     
         1 . An endoscopic treatment tool, comprising:
 an elongated member including a distal end and a proximal end, the elongated member including a pre-curved shape portion having a curved shape at the distal end of the elongated member; and   an indicator disposed on the distal end of the elongated member, the indicator extending linearly along a longitudinal axis of the elongated member,   wherein the indicator has a width that is less than half of a circumferential dimension of an outer circumferential surface of the elongated member in a circumferential direction of the elongated member.   
     
     
         2 . The endoscopic treatment tool according to  claim 1 , wherein the indicator is disposed at a position corresponding to a bending direction of the pre-curved shape portion in the circumferential direction of the elongated member. 
     
     
         3 . The endoscopic treatment tool according to  claim 1 , wherein the indicator is disposed at a position corresponding to an opposite side of a bending direction of the pre-curved shape portion in the circumferential direction of the elongated member. 
     
     
         4 . The endoscopic treatment tool according to  claim 1 , further comprising a braid disposed between the distal end and the proximal end of the elongated member, wherein:
 the indicator includes a distal indicator and a proximal indicator,   the distal indicator is disposed on the elongated member between a distal end and a proximal end of the braid, the distal indicator extending along the longitudinal axis of the elongated member,   the proximal indicator is disposed between the distal end and the proximal end of the braid on the elongated member, the proximal indicator disposed at a more proximal side of the elongated member than the distal indicator, and the proximal indicator extending along the longitudinal axis; and   the pre-curved shape portion is disposed between a distal end of the distal indicator and the distal end of the elongated member.   
     
     
         5 . The endoscopic treatment tool according to  claim 4 , wherein:
 the distal indicator is disposed between a position of 5 centimeters from the distal end of the elongated member toward a proximal end side of the elongated member and a position of 10 centimeters from the distal end of the elongated member toward the proximal end side of the elongated member, and   the proximal indicator is disposed between a position of 10 centimeters from the distal end of the elongated member toward the proximal end side of the elongated member and a position of 15 centimeters from the distal end of the elongated member toward the proximal end side of the elongated member.   
     
     
         6 . The endoscopic treatment tool according to  claim 4 , wherein:
 the distal indicator includes a first distal indicator and a second distal indicator, and   the first distal indicator is disposed at an opposite side with respect to the second distal indicator in a radial direction of the elongated member.   
     
     
         7 . The endoscopic treatment tool according to  claim 4 , wherein:
 the proximal indicator includes a first proximal indicator and a second proximal indicator, and   the first proximal indicator is disposed at an opposite side with respect to the second proximal indicator in a radial direction of the elongated member.   
     
     
         8 . An endoscopic treatment tool for use with an endoscope including an observation optical system, the endoscopic treatment tool comprising:
 an elongated member including a distal end and a proximal end;   a distal indicator disposed on the elongated member, the distal indicator extending along a longitudinal axis of the elongated member; and   a proximal indicator disposed on the elongated member at a more proximal side of the elongated member than the distal indicator, the proximal indicator extending along the longitudinal axis,   wherein:
 the distal indicator is on a first part of the elongated member protruded from the endoscope by a first protrusion amount, the first part of the elongated member being configured to be arranged within a field of view of the observation optical system, 
 the proximal indicator is on a second part of the elongated member protruded from the endoscope by a second protrusion amount larger than the first protrusion amount, the second part of the elongated member being configured to be arranged within a field of view of the observation optical system, and 
 each of the distal indicator and the proximal indicator has a width that is less than a half of a circumferential dimension of an outer circumferential surface of the elongated member in a circumferential direction of the elongated member, respectively. 
   
     
     
         9 . The endoscopic treatment tool according to  claim 8 , wherein:
 the distal indicator is disposed between a position of 5 centimeters from the distal end of the elongated member toward a proximal end side of the elongated member and a position of 10 centimeters from the distal end of the elongated member toward the proximal end side of the elongated member, and   the proximal indicator is disposed between a position of 10 centimeters from the distal end of the elongated member toward the proximal end side of the elongated member and a position of 15 centimeters from the distal end of the elongated member toward the proximal end side of the elongated member.   
     
     
         10 . The endoscopic treatment tool according to  claim 8 , further comprising a braid disposed between the distal end and the proximal end of the elongated member, wherein:
 the endoscope further includes a channel for inserting a treatment tool, and a raising stand for raising the treatment tool inserted into the channel, and   in a state in which the proximal indicator is positioned in the field of view of the observation optical system, a proximal end of the braid is positioned at the more proximal side of the elongated member than a proximal end of the raising stand.   
     
     
         11 . The endoscopic treatment tool according to  claim 8 , wherein:
 the elongated member includes a pre-curved shape portion disposed between a distal end of the distal indicator and the distal end of the elongated member, the pre-curved shape portion having a restoring force so as to restore to a curved shape in which the longitudinal axis of the elongated member is curved, and   a distal end of the distal indicator is disposed in a vicinity of a proximal end of the pre-curved shape portion.   
     
     
         12 . The endoscopic treatment tool according to  claim 8 , wherein:
 a distal portion of the elongated member includes a pre-curved shape portion configured to restore to a curved shape, and   a distal end of the pre-curved shape portion is positioned in a range of the width of the distal indicator and the proximal indicator when viewed in a front view from a direction along the longitudinal axis.   
     
     
         13 . The endoscopic treatment tool according to  claim 8 , wherein the elongated member includes a braid with a proximal end and a distal end, the proximal end being more proximal than the proximal indicator, and the distal end being more distal than the distal indicator. 
     
     
         14 . The endoscopic treatment tool according to  claim 8 , wherein:
 the distal indicator includes a first distal indicator and a second distal indicator, and   the first distal indicator is disposed at an opposite side with respect to the second distal indicator in a radial direction of the elongated member.   
     
     
         15 . The endoscopic treatment tool according to  claim 8 , wherein:
 the proximal indicator includes a first proximal indicator and a second proximal indicator, and   the first proximal indicator is disposed at an opposite side with respect to the second proximal indicator in a radial direction of the elongated member.   
     
     
         16 . The endoscopic treatment tool according to  claim 14 , wherein a color of the first distal indicator and the second distal indicator is formed by a colored paint. 
     
     
         17 . The endoscopic treatment tool according to  claim 16 , wherein the color of the first distal indicator is different from the color of the second distal indicator. 
     
     
         18 . The endoscopic treatment tool according to  claim 15 , wherein a color of the first proximal indicator and the second proximal indicator is formed by a colored paint. 
     
     
         19 . The endoscopic treatment tool according to  claim 18 , wherein the color of the first proximal indicator is different from the color of the second proximal indicator.