Cook® Nathanson Liver Retractor Product Information Used to fully support and retract the liver during laparoscopic upper GI surgery, enabling a better view of the operating field. Supplied non-sterile. Intended for reuse. Related products Read more BFW™ Daymark™ Add to cart Cook® Biodesign® 4-Layer Tissue Graft $0.00 Read more Cook® Mixter Endoscopic Cholangiography Sets Read more Surgical Specialities ON-Q® Soaker & SilverSoaker Catheters Read more Surgical Specialities ON-Q® Tunnelers