title: [Animal experimental study of compression anastomosis ring for low anterior resection].
abstract: OBJECTIVE
  To evaluate the feasibility and safety of nickel-titanium compression anastomosis ring (CAR27) in colorectal anastomosis after low anterior rectal resection in animal models.
  
  
  METHODS
  End-to-end colorectal anastomosis was performed using CAR27 in 6 experimental pigs after resection of the middle and lower third of the rectum. The animals were observed postoperatively for up to 56 days. Five pigs were sacrificed at day 14 and the other at day 56. Distance from anal verge to anastomosis and anastomotic circumference were measured. Histopathologic examination was performed.
  
  
  RESULTS
  The median distance from anal verge was 5.3(4-6) cm. No anastomotic leak or other complications were observed. All the pigs recovered and gained weight. In 5 animals sacrificed at day 14, the mean circumference of the anastomosis was 6.8(6.5-7.0) cm, and histopathological examination showed mild inflammatory reaction and fibrosis. In the one sacrificed at day 56, the circumference expanded to 9.3 cm, and no inflammation and fibrosis were observed. Minor adhesion was noticed in only one pig, while smooth and intact serosa in the anastomosis was seen in the rest of the animals.
  
  
  CONCLUSIONS
  CAR27 is a promising device for mid and low colorectal anastomosis.
authors: Department of Abdominal Surgical Oncology, Cancer Hospital, Chinese Academy of Medical Sciences, Beijing 100021, China.
authors: Jian-Wei
authors: JW
authors: Liang
authors: Zheng
authors: Z
authors: Wang
authors: Xing-Mao
authors: XM
authors: Zhang
authors: Da-Wei
authors: DW
authors: Zhan
authors: Zhi-Xiang
authors: ZX
authors: Zhou