A medical system, comprising an implantable access port including an implantable access port body and at least one implantable access port needle； wherein the at least one needle is concealable inside the access port body in a concealed position and is exposable outside the access port body in an exposed position； wherein the at least one needle is arranged within the access port body to penetrate outwardly through skin of a subject from within the subject when the access port is implanted in the subject； a transfer device coupled to the at least one needle of the access port, the transfer device configured to transfer a fluid to and/or from the access port； and wherein the transfer device is configured to form a closed system with the access port, wherein the transfer device includes a fluid flow passage configured to transfer the fluid to and/or from the access port.
