Stent with anti-migration function

An exemplary stent may include an elongate tubular member having a longitudinal axis, the elongate tubular member including at least one knit filament forming a plurality of twisted knit stitches, an intermediate crosspiece portion extending circumferentially between radially adjacent twisted knit stitches. Each twist knit stitch may be interconnected with a longitudinally adjacent twist knit stitch, forming a series of connected stitches. The elongate tubular member may be configured to move between a contracted configuration in which the series of interconnected stitches form a longitudinal column and an expanded configuration in which the series of interconnected stitches extend helically around the elongate tubular member. 示例性支架可包括具有纵向轴线的细长管状构件，该细长管状构件包括至少一根针织细线，该针织细线形成多个扭转针织线迹，中间横档部分在径向相邻的扭转针织线迹之间周向延伸。每个扭转针织线迹可以与纵向相邻的扭转针织线迹相互连接，形成一系列连接的线迹。细长管状构件可配置成在收缩形态和扩张形态之间移动，其中在收缩形态中，一系列互连接的线迹形成纵向列，并且在扩张形态中，一系列互连接的线迹围绕细长管状构件螺旋地延伸。