Endoscopic ligation tool and endoscope

Abstract

An endoscopic ligation tool for ligating an internal body tissue such as an esophageal varix, including: an outer cylinder member formed in the shape of a cylinder; an inner cylinder member formed in the shape of a cylinder, which is capable of sliding movement within the outer cylinder member; and an O-ring (ligation band member) which is annular in shape and freely extends and contracts.

1 . An endoscopic ligation tool for ligating an internal body tissue, comprising: 
 an outer cylinder member formed in the shape of a cylinder, having a base end that can attach to and release from the front end of the inserted part of an endoscope in which a channel is formed;    an inner cylinder member formed in the shape of a cylinder, which can project out from the front end of said outer cylinder member and which is capable of sliding movement within said outer cylinder member; and    a ligation band member which is annular in shape and freely extends and contracts, that is attached to the outer peripheral surface of said inner cylinder member that projects out from the front end of said outer cylinder member; wherein,    when the front end of said inner cylinder member comes into contact with said internal body tissue, said inner cylinder member is moved relative to said outer cylinder member in the direction of the base end of said outer cylinder member, as a result of suction force when said internal body tissue is suctioned via said channel, and said ligation band member can be pushed out by the front end of said outer cylinder member and disconnected.    
   
   
       2 . An endoscopic ligation tool for ligating an internal body tissue, comprising: 
 an outer cylinder member formed in the shape of a cylinder, having a base end that can attach to and release from the front end of the inserted part of an endoscope in which a channel is formed;    an inner cylinder member formed in the shape of a cylinder, which can project out from the front end of said outer cylinder member and which is capable of sliding movement within said outer cylinder member; and    a ligation band member which is annular in shape and freely extends and contracts, that is attached to the outer peripheral surface of said inner cylinder member that projects out from the front end of said outer cylinder member; wherein,    when the front end of said inner cylinder member comes into contact with said internal body tissue, said inner cylinder member is moved relative to said outer cylinder member in the direction of the base end side of said outer cylinder member, due to the pushing force of said inserted part on said internal body tissue, and said ligation band member can be pushed out by the front end of said outer cylinder member, and disconnected.    
   
   
       3 . An endoscopic ligation tool as set forth in  claim 1 , wherein a convexly-shaped part is provided projecting out in the radial direction from the inner peripheral surface of the base end side of said inner cylinder member.  
   
   
       4 . An endoscopic ligation tool as set forth in  claim 1 , wherein a floor part, in which a communicating hole is formed for communicating the inside with the outside, is formed to the base end of said inner cylinder member.  
   
   
       5 . An endoscopic ligation tool according to  claim 1 , wherein comprising an anti-disconnect mechanism for preventing said inner cylinder member from disconnecting from said outer cylinder member.  
   
   
       6 . An endoscopic ligation tool according to  claim 1 , wherein a sealing agent for adjusting the sliding friction is disposed to the space between said inner cylinder member and said outer cylinder member.  
   
   
       7 . An endoscopic ligation tool, according to  claim 1 , wherein said outer cylinder member and said inner cylinder member are both formed of a transparent member.  
   
   
       8 . An endoscopic ligation tool, according to  claim 1 , wherein an engaging groove in which said ligation band member can engage is formed to the outer peripheral surface of said inner cylinder member.  
   
   
       9 . An endoscope comprising: 
 a pliable inserted part;    a channel passing through said inserted part;    a suction source that is connected to the base end of said channel and can suction the area outside the front end of said inserted part; and    an endoscopic ligation tool according to  claim 1 , wherein provided to the front end of said inserted part.    
   
   
       10 . An endoscope as set forth in  claim 9 , wherein said suction source is designed to provide a suction pressure such that, when the front end of said inner cylinder member and said internal body tissue are adhered together, said internal body tissue can be drawn up into said inner cylinder member, and relative movement of said inner cylinder member with respect to said outer cylinder member is made possible.