Implantable access device for accessing the vascular system of a human or animal body, particularly subcutaneously implantable access port

An implantable access device to access a vascular system of a human or animal body, comprising:

• a port body with at least one outlet opening connected or connectable to a catheter to accessing the vascular system of the human or animal body;
• a needle entrance formed entirely by a single structure with at least one inlet opening to receive a needle, wherein the needle entrance is connected to the port body and movable relative to the port body between a first, unactuated operating condition and a second, actuated operating condition, and wherein at least a portion of the needle entrance is external to the port body;
• and
• at least one bistable locking mechanism configured to lock the needle entrance to the port body in the first, unactuated operating condition and configured to further lock the needle entrance to the port body in the second, actuated operating condition,
• wherein the at least one bistable locking mechanism is activated by a predetermined movement of the needle entrance relative to the port body and the predetermined movement is achieved by at least one of
• (1) inserting the needle into the needle entrance and moving the needle entrance via the inserted needle, and
• (2) moving the needle entrance via an inserted needle and removing the inserted needle from the needle entrance, and
• wherein the predetermined movement applied to the needle entrance comprises a pivoting movement and a translational movement.