title: Fast magnetic reconstruction of the portal vein with allogeneic blood vessels in canines.
abstract: 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-NdFeB) composite rings. The NdFeB 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.
  
  
  CONCLUSIONS
  The Ti-NdFeB composite MCA device was applicable in reconstruction of large vessels after resection. This device was easy to use and the anastomosis was functionally better than the traditional sutured anastomosis.
authors.affiliation: Department of Hepatobiliary Surgery, First Affiliated Hospital, Medical School of Xi'an Jiaotong University, Xi'an 710061, China; Regenerative Medicine and Surgery Engineering Research Center of Shaanxi Province, Xi'an 710061, China. luyi169@126.com.
authors.forename: Shan-Pei
authors.initials: SP
authors.lastname: Wang
authors.forename: Xiao-Peng
authors.initials: XP
authors.lastname: Yan
authors.forename: Fei
authors.initials: F
authors.lastname: Xue
authors.forename: Ding-Hui
authors.initials: DH
authors.lastname: Dong
authors.forename: Xu-Feng
authors.initials: XF
authors.lastname: Zhang
authors.forename: Feng
authors.initials: F
authors.lastname: Ma
authors.forename: Hao-Hua
authors.initials: HH
authors.lastname: Wang
authors.forename: Yi
authors.initials: Y
authors.lastname: Lv
mesh_terms: D064591:Allografts; D000497:Alloys; D000714:Anastomosis, Surgical; D000818:Animals; D001783:Blood Flow Velocity; D001896:Boron Compounds; D004285:Dogs; D004867:Equipment Design; D005240:Feasibility Studies; D005290:Ferric Compounds; D059346:Magnets; D008297:Male; D023421:Models, Animal; D009354:Neodymium; D011169:Portal Vein / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000637:transplantation*; D011172:Portography; D019651:Plastic Surgery Procedures / Q000295:instrumentation*; D013997:Time Factors; D014025:Titanium; D018615:Ultrasonography, Doppler, Color; D058017:Vascular Grafting / Q000295:instrumentation*; D014654:Vascular Patency
chemical_list: D000497:Alloys; D001896:Boron Compounds; D005290:Ferric Compounds; D009354:Neodymium; D014025:Titanium