Implantable access port for removal and/or return of fluids to a patient, comprising an internal conduit connectable at its proximal end to the access port and at its distal end to a vascular structure of the patient; an external conduit connectable at its proximal end to the access port and at its distal end to an extracorporeal device; and a transcutaneous coupling member destined to be anchored in a tissue of the patient and comprising a first valve system operable to be in an open or closed configuration; the coupling member further comprises a second valve system removably connectable to the first valve system and operable to be in an open or closed configuration, such as to establish fluid communication between the internal and external conduits when the first and second valve systems are connected and in open configuration.