the stent set 1 according to the invention includes a hollow insertion rail 2 , which is provided at its front or proximal end 5 , i . e . pointing towards the body center after insertion , with a bent curvature area 7 , to which is connected a short stretched end region 6 . the end region 6 forms , with respect to the main body of the hollow insertion rail 2 an obtuse angle of 130 ° to 170 °. in the hollow insertion rail 2 there is an intraurethral catheter 12 adapted to be introduced into a patient &# 39 ; s body . the guide part 4 has a length such that when guide part 4 is completely engaged in the hollow insertion rail 2 and with the intraurethral catheter 12 inserted in the hollow insertion rail 1 , the catheter 12 abuts with a cylindrical read end 13 thereof against a front end 14 of the guide part 4 , whereas , a rounded tip 15 of the intraurethral catheter 12 projects out of the proximal end 5 of the guide part 4 . the guide part 4 may include a rear gripping part 3 , for enabling inserting a slide 24 ( fig3 ) in the intraurethral catheter 12 . the guide part 4 serves as a stop or slide - in limitation for the intraurethral catheter 12 , so that during the advance of the hollow insertion rail 2 , the intraurethral catheter 12 is not moved back further into the hollow insertion rail 2 . the slide 24 which , completely inserted in the hollow insertion rail 2 , in the guide part 4 and the intraurethral catheter 12 , abuts from the inside against the rounded tip 15 of the catheter 12 . the highly elastic , preferably polyethylene or polyurethane intraurethral catheter 12 shown in fig2 has a cylindrical basic body with one small basket or cage 18 , 17 respectively provided at the proximal and distal ends and an elongated part 16 of fixed length between the baskets 18 , 17 . the baskets 18 , 17 are constructed in one piece with the elongated part 16 and above the basket 17 , at the proximal end , the rounded tip 15 is connected in one - piece manner to the basket 17 , while below the basket 18 , at its side remote from the rounded tip 15 , there is a cylindrical rear end part 13 connected in one piece thereto . the baskets 18 , 17 are formed by providing longitudinal slots in the body of the intraurethral catheter 12 , compressing the intraurethral catheter 12 , so that the remaining ribs in this area are directed outwards , and fixing the intraurethral catheter 12 in this position by heat treatment . the intraurethral catheter 12 can have a different color on the distal half from a color on the proximal half . the cylindrical end part 13 has an upper end face and a lateral opening 19 for receiving a thread 20 ( fig2 ). the thread 20 , passed through the opening 19 , is preferably a double thread , with ends of the thread 20 being knotted together at the end remote from the intraurethral catheter 12 . the length of the knotted double thread 20 is at least 11 / 2 times the length of the guide rail 4 and guide part 2 ( shoved together ). the catheter 12 can be subsequently removed again by the thread . the basket 17 at the proximal end is larger than the basket 18 at the distal end . the slide 24 ( fig3 ), preferably made from highly flexible but axially relatively stiff material , has two marks 25 , 26 in the form of indentations , which have a different reflecting power . at its front end , the intraurethral catheter 12 is provided with initial openings 21 , 22 through which , following the passage of the intraurethral catheter 12 into the bladder , liquid passes into the hollow insertion rail 2 , respectively guide part 4 and at the rear end passes out of the hollow insertion rail 2 , so that the position of the intraurethral catheter 12 is indicated . the intraurethral catheter 12 is inserted in a conventional manner through the urethra 31 by the hollow insertion rail 2 . in the transition region to the sphincter 32 and the prostate 33 , the urethra 31 has a curvature . the curvature region 6 of the hollow insertion rail 2 is adapted to this curvature . when the hollow insertion rail 2 has been inserted through the urethra 31 , the slide 24 is moved from the distal end of the hollow insertion rail 2 into the tip 15 of the intraurethral catheter 12 . this impact can be seen from the outside in that the first mark 26 just projects from the distal end of the hollow insertion rail 2 respectively the guide part 4 . the intraurethral catheter 12 is moved out of the hollow insertion rail 2 by the slide 24 , so that the first , front basket 17 is located in the bladder 34 and the rear basket 18 in the urethra 31 in a vicinity of the prostate 33 , so that the sphincter 32 , after removing the hollow insertion rail 2 , is not damaged . when the first basket 17 has been completely moved out of the hollow insertion rail 2 , this is indicated by the second mark 25 . on reaching the bladder 34 on insertion , urine immediately passes out of the initial openings 21 , 22 , so that it is clear from the outside that this stage is reached . after passing out from the hollow insertion or guide rail 2 the baskets 17 , 18 radially expand , so that urine enters through the openings between the jacket portions of the basket 17 and can pass out through the opening of the basket 18 . after insertion has taken place the slide 24 , hollow insertion rail 2 and optionally guide parts 4 are retracted and removed from the urethra 31 . the thread 20 can remain on the intraurethral catheter 12 for removing the latter or it is cut off and removed when the intraurethral catheter 12 is left in the body interior , because otherwise it can constitute an infection source . the intraurethral catheter 12 introduced by the stent set 1 according to the invention can now remain permanently in the body or can be removed if , e . g . due to an operation being performed , it is no longer required .