Devices, systems and methods for removal and replacement of a catheter for an implanted access port

A medical device comprising:

• an implantable access port including a fluid passage operable to introduce fluid to a host and/or remove fluid from the host, the fluid passage accessible through a fluid passage access opening;
• and
• a needle configured to penetrate the host, wherein at least a portion of the fluid passage is defined by the needle;
• a needle elevator mechanism including a movable needle platform which includes a piston to extend the needle out of the access port and to retract the needle into the access port;
• an implantable catheter connectable with the access port, the catheter having a proximal end and a distal end;
• wherein the catheter is connectable with the access port by a connection within the access port;
• wherein the portion of the fluid passage defined by the needle is defined by a lumen of the needle;
• wherein the catheter is insertable into the fluid passage of the access port, including the lumen of the needle, through the fluid passage access opening;
• and
• wherein the catheter is advanceable through the fluid passage such that the distal end of the catheter extends from the access port and the proximal end of the catheter is located within the access port.