title: Innovative magnetic rings for circumferential mucosectomy: preliminary research.
abstract: OBJECTIVE
  To improve the procedures used to treat prolapse and hemorrhoids, novel magnetic rings were invented to use in circumferential mucosectomies to avoid the disadvantages of stapling techniques.
  
  
  METHODS
  Thirty adult pigs were randomly divided into three groups: Group A (n = 10), which underwent circumferential mucosectomy with novel magnetic rings; Group B (n = 10), which underwent circumferential mucosectomy with conventional magnetic rings and Group C (n = 10), which underwent circumferential mucosectomy with a stapling technique.
  
  
  RESULTS
  All pigs underwent the operation successfully, and the mean length of the procedure was similar among the three groups (p > 0.05). There was no bleeding in Group A or Group B, while there was a mean blood loss of 78.32 ± 26.03 ml in Group C (p < 0.01). Three cases of anastomotic stenosis were found in Group C (3/10); two cases were found in Group B (2/10) and no anastomotic stenosis was found in Group A (0/10). The difference between groups A and C was statistically significant (p < 0.05). The cost for the magnetic rings in groups A and B was noticeably lower than that of the stapling techniques in Group C (20.12 ± 3.35 vs. 15.76 ± 2.92 vs. 550.16 ± 29.71 US dollars, p < 0.001). The magnetic rings in groups A and B were spontaneously discharged from the body with the necrotic tissues within 1-2 weeks (8.20 ± 2.73 vs. 9.31 ± 3.62 days, p > 0.05), avoiding the permanent implantation of staples in Group C. The anastomosis site in Group A showed a smoother and more rapid healing process than that in Group B or C.
  
  
  CONCLUSIONS
  The innovative magnetic rings we developed for circumferential mucosectomies provide a simple and novel surgical procedure for prolapse and hemorrhoids.
authors.forename: Geng Shu
authors.initials: GS
authors.lastname: An
authors.forename: Zhang Qing
authors.initials: ZQ
authors.lastname: Huai
authors.forename: Zhou
authors.initials: Z
authors.lastname: Sheng
authors.forename: Zhang Shu
authors.initials: ZS
authors.lastname: Min
authors.forename: Yang Jing
authors.initials: YJ
authors.lastname: Wen
authors.forename: Hao Dong
authors.initials: HD
authors.lastname: Ming
authors.forename: Zhang Zuo
authors.initials: ZZ
authors.lastname: Xing
mesh_terms: D000818:Animals; D013505:Digestive System Surgical Procedures / Q000379:methods*; D004195:Disease Models, Animal; D006484:Hemorrhoids / Q000473:pathology / Q000601:surgery*; D008280:Magnetics / Q000295:instrumentation*; D008297:Male; D009092:Mucous Membrane / Q000601:surgery*; D012005:Rectal Prolapse / Q000473:pathology / Q000601:surgery*; D013528:Surgical Staplers; D013536:Suture Techniques; D013552:Swine