Graft-port hemodialysis systems, devices, and methods

A method for establishing access to a blood vessel of a patient, the method comprising:

• implanting a port device entirely under a skin of the patient, wherein the port device comprises:
• a first tapered seat configured to receive a tip of a first access tube, the first tapered seat having a proximal portion, a distal portion, and a conical section extending between the proximal portion and the distal portion;
• a second tapered seat for receiving a tip of a second access tube;
• and
• an interface surface configured to engage (i) the blood vessel of the patient or (ii) a vascular access catheter, the interface surface having an aperture in fluid communication with the distal portion of the first tapered seat;
• introducing the tip of the first access tube into the port device via the proximal portion of the first tapered seat;
• advancing the tip of the first access tube toward the distal portion of the first tapered seat to create a mismatch fit with a diameter of the tip of the first access tube along the conical section of the first tapered seat when the first tapered seat receives the first access tube in use, wherein the mismatch fit is adapted to cause an increase in flow during treatment;
• and
• advancing the tip of the second access tube toward a distal portion of the second tapered seat to create a match fit with a diameter of the second access tube.