Medical access ports, transfer devices and methods of use thereof

A medical system, comprising:

• an implantable access port configured to be implanted into a subject, the access port including an implantable access port body and at least one implantable access port needle;
• wherein the access port body is compressible to a compressed position and expandable to an expanded position;
• wherein the at least one implantable access port needle comprises a first needle and a second needle;
• wherein the first needle comprises a first needle shaft with a first needle lumen and the second needle comprises a second needle shaft with a second needle lumen;
• wherein the first needle and the second needle are concealed inside the access port body when the access port body is in the expanded position and are exposed outside the access port body when the access port body is in the compressed position;
• wherein the first needle and the second needle are arranged within the access port body to penetrate outwardly through skin of the subject from within the subject when the access port is implanted in the subject;
• a transfer device configured to transfer fluid to and fluid from the subject through the access port when coupled with the first needle and the second needle, respectively;
• and
• wherein the transfer device includes a first fluid flow passage configured to couple with the first needle lumen of the first needle to transfer the fluid to the subject through the access port and a second fluid flow passage configured to couple with the second needle lumen of the second needle to transfer the fluid from the subject through the access port;
• wherein the transfer device comprises a tubular housing which is sealable against the skin of the subject prior to the first needle and the second needle penetrating outwardly through the skin of the subject, and into which the first needle and the second needle are disposable subsequent to the first needle and the second needle penetrating outwardly through the skin of the subject;
• and
• wherein the tubular housing is operable to compress the access port body to the compressed position when the access port is implanted in the subject.