Fast magnetic reconstruction of the portal vein with allogeneic blood vessels in canines

BACKGROUND:The resection and reconstruction of large vessels,including the portal vein,are frequently needed in tumor resection.Warm ischemia before reconstruction might have deleterious effects on the function of some vital organs and therefore,how to reconstruct the vessels quickly after resection is extremely important.The present study was to introduce a new type of magnetic compression anastomosis(MCA)device to establish a quick non-suture anastomosis of the portal vein after resection in canines.METHODS:The new MCA device consists of a pair of titanium alloy and neodymium-ferrum-boron magnet(Ti-Nd Fe B)composite rings.The Nd Fe B magnetic ring as a core of the device was hermetically sealed inside the biomedical titanium alloy case.Twelve canines were divided into two groups:a MCA group in which the end-to-end anastomoses was made with a new device after resection in the portal vein and a traditional manual suture(TMS)group consisted of 6 canines.The anastomosis time,anastomotic patency and quality were investigated at week 24 postoperatively.RESULTS:The portal vein was reconstructed successfully in all of the animals and they all survived.The duration of portal vein anastomosis was significantly shorter in the MCA group than in the TMS group(8.16±1.25 vs 36.24±2.17 min,P<0.05).Portography and ultrasound showed that the blood flow was normal without angiostenosis or thrombosis in all of the canines.Hematoxylin-eosin staining and electron microscope scanning showed in contrast to the TMS group,MCA anastomotic intimal was much smoother with more regularly arranged endothelial cells at week 24 postoperatively.