PROVIDED IS A CATHETER ASSEMBLY (1) INCLUDING: A HOLLOW CATHETER (2) A CATHETER HUB (3), FIXED ONTO A BASE END PORTION OF THE CATHETER (2), INTERNALLY HAVING A PASSAGE (31) COMMUNICATING WITH THE INSIDE OF THE CATHETER (2) A NEEDLE (4) INSERTED INTO THE CATHETER (2) A NEEDLE HUB (5), FIXED ONTO A BASE END PORTION OF THE NEEDLE (4), CAPABLE OF BEING CONNECTED TO A BASE END SIDE OF THE CATHETER HUB (3). THE CATHETER ASSEMBLY (1) FURTHER INCLUDES: A VALVE ELEMENT (7), POSITIONED TO BLOCK THE PASSAGE (31), HAVING AN OPENING AND CLOSING UNIT (71) CAPABLE OF BEING OPENED AND CLOSED AN OPERATION MEMBER (8) HAVING A TUBULAR BODY, ARRANGED SUCH THAT THE BASE END SIDE OF THE CATHETER HUB (3) COMMUNICATES WITH A TIP SIDE THEREOF BY INSERTING ONE OPENING PORTION (85) OF THE OPERATION MEMBER (8) INTO THE OPENING AND CLOSING UNIT (71) A COMMUNICATION UNIT (9), PROVIDED ON AN INNER PERIPHERY PORTION OF THE CATHETER HUB (3) INCLUDING THE VALVE ELEMENT (7) SUCH THAT THE BASE END SIDE COMMUNICATES WITH THE TIP SIDE AND A SEALING MEMBER (10) HAVING A TUBULAR BODY AND ALLOWING THE PASSAGE OF AIR YET PROHIBITING THE PASSAGE OF LIQUID, PROVIDED BETWEEN THE VALVE ELEMENT (7) AND THE OPERATION MEMBER (8) SO AS TO BLOCK THE COMMUNICATION UNIT (9). FIGURE 2.
