The operation of catheterization catheterization in the clinic may become difficult by physiological and pathological stenosis and bending of the urethra itself of the human body.Stenosis extended type of catheterization catheterCatheterization catheter on the outer surface of head tipA nipple shaped flexible hollow diameter portion (16) is connected.The bottom portion (161) isConnect to the outer surface of the head tipThe connection part of the small diameter part is composed.Other portions, including small diameter tips (162), includeAn expansible portion (1612) of a small diameter portion is constructed.A small diameter lumenCommunicate with the outside through at least one narrow diameter bore passage (1312) which is a passage within the wall of the catheterization catheterA narrow bore bore passageAt least one inner diameter bore opening (1311), which is an opening communicating with the lumen portion lumenLocated in the middle portion (15) or tail (14) of the catheterization catheter；According to a stricture extended type of catheterization catheter according to the present invention having at least one small diameter extraperreolar opening (1313) communicating with the outer spaceIn insertionFor the inflatable part of the head detailBy uniformly coating the lubricantIncrease the success rate of insertion and reduce the risk of injury and infection to the limit.臨床における導尿カテーテル挿入の操作は、人体の尿道自体の生理的や病理的な狭窄、曲がりにより困難になることがある。狭窄拡張型導尿カテーテルであって、導尿カテーテル頭部先端（１３１）の外表面に、ニップル状でフレキシブルな中空の細径部（１６）が接続され、細径部底部（１６１）は、頭部先端（１３１）の外表面と接続する、細径部の接続部分を構成し、細径部先端部（１６２）を含む他の部分は、細径部の膨張可能部分（１６１２）を構成し、細径部内腔（１６０）は、導尿カテーテルの壁内の通路である少なくとも１つの細径部内腔通路（１３１２）を通して外部と連通し、細径部内腔通路（１３１２）は、細径部内腔（１６０）と連通する開口である少なくとも１つの細径部内腔通路内開口（１３１１）と、導尿カテーテルの中間部（１５）又は尾部（１４）に位置する、外部空間と連通する少なくとも１つの細径部内腔通路外開口（１３１３）とを有する本発明の狭窄拡張型導尿カテーテルによれば、挿入において、頭部細部の膨張可能部分のみに対して、潤滑物を均質的に塗ることにより、挿入の成功率を高める同時に損傷と感染のリスクも極限まで下げる。
