A deployment system (10) for a self-expanding device (12) having a proximal end (25) and a distal end (23), the system (10) comprising: a self-expanding device (12) compacted to a smaller diameter for supply in a body duct before deployment； the device being compacted on a part of an outer surface of a catheter rod (13)； a first piece of a first sheath (16) covering at least a portion of said compacted self-expanding device (12)； a second sheath (14) covering at least a portion of said first piece of the first sheath (16), the second sheath (14) having an inner diameter smaller than an inner diameter of the first sheath (16) when determined as separate individual parts of the assembled system (10)； and a second piece of the first sheath (16) everted back and covering at least a part of said second sheath (14), the system (10) being configured such that the application of tension in the direction proximal to The second piece of the first sheath (16) causes the displacement of the second sheath (14) in a proximal direction, and causes the release of the self-expanding device (12).Un sistema de despliegue (10) para un dispositivo (12) autoexpandible que tiene un extremo proximal (25) y un extremo distal (23), el sistema (10) que comprende: un dispositivo (12) autoexpandible compactado a un menor diámetro para el suministro en un conducto corporal antes del despliegue； siendo el dispositivo compactado sobre una parte de una superficie exterior de una varilla catéter (13)； un primer trozo de una primera vaina (16) que cubre al menos una parte de dicho dispositivo (12) autoexpandible compactado； una segunda vaina (14) que cubre al menos una parte de dicha primera parte trozo de la primera vaina (16), teniendo la segunda vaina (14) un diámetro interior menor que un diámetro interior de la primera vaina (16) cuando se determinan como partes individuales separadas del sistema (10) ensamblado； y una segunda parte trozo de la primera vaina (16) evertida hacia atrás y que cubre
