Catheter for aspiration, fragmentation and removal of removable material, in particular thrombi and emboli, from hollow bodies, in particular blood vessels, comprising: a flexible tube (52; 122; 132; 182), the flexible tube (52; 122; 132; 182) having a proximal end and a distal end , a flexible helical transport screw (62; 184), the flexible helical transport screw (62; 184) extending from the proximal end of the flexible tube (52; 122; 132; 182) inside of the flexible tube (52; 122; 132; 182) in direction of the distal end of the flexible tube (52; 122; 132; 182) and the flexible helical transport screw (62; 184) having a distal end , wherein said flexible helical transport screw (62; 184) is provided with helically extending transport surfaces and is rotatable by a drive means , a stopper element (82; 92; 102; 112; 142; 152; 162; 172; 192; 202; 222) for providing an abutment for the distal end of the flexible helical transport screw (62; 184), wherein the stopper element (82; 92; 102; 112; 142; 152; 162; 172; 192; 202; 222) is provided spaced apart from the distal end of the catheter (51; 121), thereby defining a distal region of the catheter (51; 121) extending from the stopper element (82; 92; 102; 112; 142; 152; 162; 172; 192; 202; 222) in direction to the distal end of the catheter (51; 121), which is free of rotational elements inside, at least one suction opening (74; 144; 154, 156; 174; 194, 196; 204; 224) for aspiration of said removable material into the inside of the flexible tube (52; 122; 132; 182), wherein the at least one suction opening (74; 144; 154, 156; 174; 194, 196; 204; 224) is provided in the distal region of the catheter (51; 121). a flexible tube (52; 122; 132; 182), the flexible tube (52; 122; 132; 182) having a proximal end and a distal end , a flexible helical transport screw (62; 184), the flexible helical transport screw (62; 184) extending from the proximal end of the flexible tube (52; 122; 132; 182) inside of the flexible tube (52; 122; 132; 182) in direction of the distal end of the flexible tube (52; 122; 132; 182) and the flexible helical transport screw (62; 184) having a distal end , wherein said flexible helical transport screw (62; 184) is provided with helically extending transport surfaces and is rotatable by a drive means , a stopper element (82; 92; 102; 112; 142; 152; 162; 172; 192; 202; 222) for providing an abutment for the distal end of the flexible helical transport screw (62; 184), wherein the stopper element (82; 92; 102; 112; 142; 152; 162; 172; 192; 202; 222) is provided spaced apart from the distal end of the catheter (51; 121), thereby defining a distal region of the catheter (51; 121) extending from the stopper element (82; 92; 102; 112; 142; 152; 162; 172; 192; 202; 222) in direction to the distal end of the catheter (51; 121), which is free of rotational elements inside, at least one suction opening (74; 144; 154, 156; 174; 194, 196; 204; 224) for aspiration of said removable material into the inside of the flexible tube (52; 122; 132; 182), wherein the at least one suction opening (74; 144; 154, 156; 174; 194, 196; 204; 224) is provided in the distal region of the catheter (51; 121). <EOS>