Insertion assisting tool for endoscope

Abstract

An insertion assisting tool for an endoscope into which an insertion section of the endoscope is inserted from a base end portion side, comprising: a fluid sealing device which seals a space between a base end part of the insertion assisting tool and the endoscope insertion section, the space being formed while the insertion section of the endoscope is inserted into the base end portion side.

1 - 5 . (canceled)  
   
   
       6 . The insertion assisting tool for an endoscope of  claim 12 , further comprising: 
 a cylindrical extendable and contractible member connecting respective base end parts of the insertion section of the endoscope and the insertion assisting tool in which the insertion section of the endoscope is inserted, said cylindrical extendable and contractible member covering the insertion section.    
   
   
       7 . The insertion assisting tool for an endoscope according to  claim 6 , wherein the extendable and contractible member is an accordion-shaped member.  
   
   
       8 . The insertion assisting tool for an endoscope according to  claim 6 , wherein the extendable and contractible member is formed to have length by which a tip end part of the insertion assisting tool does not contact a first balloon of the insertion section when the extendable and contractible member is operated to extend most.  
   
   
       9 . The insertion assisting tool for an endoscope according to  claim 6 , wherein a drain port is formed at the extendable and contractible member.  
   
   
       10 . An insertion assisting tool for an endoscope into which an insertion section of the endoscope is inserted, comprising: 
 a substantially cylindrical tube formed of an elastic body in which a smaller opening than a diameter of a base end part of the insertion assisting tool is formed at one end and a smaller opening than a diameter of the endoscope insertion section is formed at the other end,    wherein in the tube, the opening formed at the one end is attached to the base end part of the insertion assisting tool in close contact with the base end part, and the insertion section is slidably inserted through the tube with the insertion section of the endoscope closely fitted in the opening formed at the other end.    
   
   
       11 . The insertion assisting tool for an endoscope according to  claim 10 , wherein the tube is formed in a size which satisfies a formula of  
         d>a−c+ ( b−a )/2  
     where an inner diameter of the insertion assisting tool is a, 
 a maximum diameter of the tube when the tube is attached to the insertion assisting tool is b,  
 a diameter of an opening formed at the other end of the tube is c, and  
 a distance from a fixing portion of the tube to the insertion assisting tool to an edge portion of the opening formed at the other end of the tube is d.  
 
   
   
       12 . An insertion assisting tool for an endoscope into which an insertion section of the endoscope is inserted from a base end portion side, comprising: 
 a fluid sealing device disposed at the base end portion side which seals a space between a base end part of the insertion assisting tool and the endoscope insertion section, the space being formed while the insertion section of the endoscope is inserted into the insertion assisting tool,    wherein said fluid scaling device connects respective base end portions of the insertion section of the endoscope and the insertion assisting tool and is cover member which covers the insertion section of the endoscope such that directions of insertion and drawing-in of the insertion section of the endoscope are changeable pivotally.