Pneumatic Reversible Portal Vein Diameter Modulation After Major Hepatectomy

"Phase A (4 patients): After laparotomy and dissection of hepatic pedicle, feasibility of MID-AVR positioning around the portal vein by hepato-biliary surgeon and visual evaluation of potential spatial conflict with hepatic artery and choledochal. Mid-AVR is removed at the end of surgery. Each procedure will be filmed.~Phase B (12 patients): Mid-AVR is maintained at the end of surgery, and during 48 hours to evaluate the persistence of an hepatopetal portal flow without portal vein thrombosis upstream MID-AVR during the 48 hours after the liver surgery at bi-daily ultrasonography."