Flow restricting stent-graft

A stent-graft comprising:

• a stent frame forming a cavity, the cavity extending from a proximal opening of the stent frame to a distal opening of the stent frame, wherein the proximal opening comprises a first aperture, wherein the distal opening comprises a second aperture, wherein the cavity defines a volume that extends from the proximal opening to the distal opening, wherein the stent frame is adapted for a fluid to flow through the cavity from the proximal opening to the distal opening such that an entirety of the fluid that enters from the proximal opening leaves through the distal opening;
• and
• a plurality of frame wires extending around a perimeter of the stent frame,
• wherein the stent frame is formed such that a cross sectional area of the cavity decreases along a first length of a flow restricting section to a crescent-shaped minimum cross sectional area of the cavity and increases along a second length of the flow restricting section, wherein the first length extends from a proximal cross sectional area of the cavity to the crescent-shaped minimum cross sectional area of the cavity and the second length extends from the crescent-shaped minimum cross sectional area of the cavity to a distal cross sectional area of the cavity,
• wherein the plurality of frame wires includes a single frame wire that conforms to the perimeter of the stent frame at the crescent-shaped minimum cross sectional area, wherein the single frame wire is configured to:
• (1) maintain the crescent-shaped minimum cross sectional area of the cavity of the stent frame when fluid below a threshold pressure flows through the cavity, and (2) deform when fluid meeting the threshold pressure flows through the cavity, thereby enabling the stent frame to expand at the crescent-shaped minimum cross sectional area.