A catheter assembly, comprising a catheter (11) having a catheter lumen (12) extending from a distal tip (13) to a proximal end (14) of the catheter； and a removable catheter cap (10) releasably connected to the catheter and comprising a cap body (15) configured for being removably connectable to the catheter distal tip, so as to facilitate capping of the catheter distal tip, and is sized and shaped for blocking passage of the cap body through the catheter lumen, wherein the cap body includes interbonded, intertwined, or/and woven separable windings of at least one predefined constituent part (17) that is sized and shaped to freely pass through the catheter lumen, wherein the separable windings are configured to separate into the at least one predefined constituent part when the cap body is pulled against the catheter distal tip.
