Tips stent graft and kit

A Transjugular Intrahepatic Portosystemic Shunt (TIPS) stent graft, comprising:

• a tubular component having a lumen extending therethrough, the tubular component configured for placement in a liver channel created for a TIPS procedure, the tubular component comprising:
• a diametrically restricted balloon expandable central section;
• a first self-expanding section;
• and
• a second self-expanding section, the first self-expanding section and the second self-expanding section sandwiching the diametrically restricted balloon expandable central section, the lumen extending through the first self-expanding section, the diametrically restricted balloon expandable central section, and the second self-expanding section, wherein the diametrically restricted balloon expandable central section comprises a shape memory alloy having a transition temperature above body temperature, the diametrically restricted balloon expandable central section being configured to assume a configuration which is more constricted than the first self-expanding section and second self- expanding section in their expanded state when heated above its transition temperature;
• and
• a collar formed as a cylinder wrapped around the diametrically restricted balloon expandable central section, the collar being arranged to selectively reduce its inner diameter to thereby constrict the diametrically restricted balloon expandable central section.