Clinically, physiological and pathological stenosis and curve of the urethra will make it harder to place a urinary catheter. Disclosed is a stenosis dilated urinary catheter. A nipple-shaped, flexible and hollow thin segment (16) is connected to the outer surface of the top (131) of the urinary catheter； the bottom (161) of the thin segment is connected to the outer surface of the top (131) of the urinary catheter, and is a connection portion of the thin segment； the remaining part comprising the top (162) of the thin segment is an expandable portion (1612) of the thin segment； the inner cavity (160) of the thin segment is connected to the outside by means of at least one pathway on a urinary catheter wall, i.e., a pathway (1312) of the inner cavity of the thin segment； the pathway (1312) of the inner cavity of the thin segment has at least an opening communicating with the inner cavity (160) of the thin segment, the openings being an inner opening (1311) of the pathway of the inner cavity of the thin segment and at least one outer opening (1313) of the pathway of the inner cavity of the thin segment located at the middle part (15) or tail part (14) of the urinary catheter and capable of communicating with an external space. During the process of placing the urinary catheter, when the expandable portion (1612) of the thin segment on the top is filled, a lubricating substance (163) is applied evenly. The damage and the risk of infection are minimized while the success rate of placement is improved.Cliniquement, la sténose et la courbe physiologiques et pathologiques de l'urètre vont rendre plus difficile la mise en place d'un cathéter urinaire. L'invention concerne un cathéter urinaire dilaté en sténose. Un segment mince souple et creux en forme de mamelon (16) est relié à la surface extérieure du sommet (131) du cathéter urinaire； le bas (161) du segment mince est relié à la surface extérieure du sommet (131) du cathéter urinaire, et est une partie de connexion du
