A stent delivery system, comprising a balloon catheter and a stent (10). The present invention relates to the technical field of medical devices. Provided is a balloon catheter with a balloon (1) with two asymmetrical ends. The catheter comprises: the balloon (1), an outer tube (2), an inner tube (3), and a connector (5). The balloon (1) is sleeved around the inner tube (3). The stent (10) is pressure gripped by the balloon (1). The distal end of the stent (10) is pressed against and held by an inclined section (102) at a distal end of the balloon (1). Alternatively, the distal end of the stent (10) extends from the distal end of the balloon (1) and is pressure gripped by the inner tube (3). The distal end of the stent (10) is pressed against and held by a distal inclined section (102) with a smaller gradient, or extends from the distal end of the balloon (1) and is pressed against and held by the inner tube (3). When the balloon (1) is subject to pressure expansion, then the distal inclined section (102) with the smaller gradient lifts the distal end of the stent (10) such that a distal diameter of the stent (10) is smaller than the proximal diameter. The invention is adapted to a physiological change of a blood vessel and prevents an expansion from injuring the blood vessel.L'invention porte également sur un système de pose d'endoprothèse, comprenant un cathéter à ballonnet et un stent (10). La présente invention concerne le domaine technique des dispositifs médicaux. L'invention concerne un cathéter à ballonnet doté d'un ballonnet (1) à deux extrémités asymétriques. Le cathéter comprend : le ballonnet (1), un tube extérieur (2), un tube intérieur (3) et un raccord (5). Le ballonnet (1) est emmanché autour du tube intérieur (3). Le stent (10) est saisi par la pression par le ballonnet (1). L'extrémité distale du stent (10) est pressée contre et maintenue par une section inclinée (102) à une extrémité distale du ballonnet (1). Alternativement, l'extrémité distale d
