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Repair of bile duct defect with degradable stent and autologous tissue in a porcine model 被引量:5
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作者 yue-Long Liang yi-chen yu +4 位作者 Kun Liu Wei-Jia Wang Jiang-Bo Ying Yi-Fan Wang Xiu-Jun Cai 《World Journal of Gastroenterology》 SCIE CAS CSCD 2012年第37期5205-5210,共6页
AIM: To introduce and evaluate a new method to re- pair bile duct defect with a degradable stent and au- tologous tissues. METHODS: Eight Ba-Ma mini-pigs were used in this study, Experimental models with common bile... AIM: To introduce and evaluate a new method to re- pair bile duct defect with a degradable stent and au- tologous tissues. METHODS: Eight Ba-Ma mini-pigs were used in this study, Experimental models with common bile duct (CBD) defect (0,5-1,0 cm segment of CBD resected) were established and then CBD was reconstructed by duct to duct anastomosis with a novel degradable stent made of poly [sebacic acid-co-(1,3-propanediol)-co- (1,2-propanediol)]. In addition, a vascularized greater omentum was placed around the stent and both ends of CBD. Cholangiography via gall bladder was per- formed for each pig at postoperative months 1 and 3 to rule out stent translocation and bile duct stricture. Complete blood count was examined pre- and post- operatively to estimate the inflammatory reaction. Liver enzymes and serum bilirubin were examined pre- and post-operatively to evaluate the liver function. Five pigs were sacrificed at month 3 to evaluate the healing of anastomosis. The other three pigs were raised for one year for long-term observation. RESULTS: All the animals underwent surgery success- fully. There was no intraoperative mortality and no bile leakage during the observation period, The white blood cell counts were only slightly increased on day 14 and month 3 postoperatively compared with that before operation, the difference was not statistically significant (P = 0.652). The plasma level of alanine aminotrans- ferase on day 14 and month 3 postoperatively was also not significantly elevated compared with that before operation (P = 0.810). Nevertheless, the plasma level of y-glutamyl transferase was increased after opera- tion in both groups (P = 0.004), especially 2 wk after operation. The level of serum total bilirubin after opera- tion was not significantly elevated compared with that before operation (P = 0.227), so did the serum direct bilirubin (P = 0.759). By cholangiography yia gall blad- der, we found that the stent maintained its integrity of shape and was stillin situ at month 1, and it disap- peared completely at month 3. No severe CBD dilation and stricture were observed at both months 1 and 3. No pig died during the 3-too postoperative observation period. No sign of necrosis, bile duct stricture, bile leak- age or abdominal abscess was found at reoperation at month 3 postoperatively. Pigs had neither fragments of stent nor stones formed in the CBD. Collagen deposit was observed in the anastomosis by hematoxylin and eosin (HE) and Masson's trichrome stains. No severe cholestasis was observed in liver parenchyma by HE staining. Intestinal obstruction was found in a pig 4 mo after operation, and no bile leakage, bile duct stricture or biliary obstruction were observed in laparotomy. No sign of bile duct stricture or bile leakage was observed in the other two pigs. CONCLUSION: The novel method for repairing bile duct defect yielded a good short-term effect without postoperative bile duct stricture. However, the long- term effect should be further studied. 展开更多
关键词 Degradable stent Bile duct defect Biliaryreconstruction Autologous tissue OMENTUM
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An Action Research of Using Problem-Centered Double-Cycles Instructional Model to Implement ModeI-Elicitng Activity
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作者 yi-chen yu Ching-Kuch Chang Lee-Meei Lin 《Journal of Mathematics and System Science》 2013年第12期614-624,共11页
The purpose of the study was to use the Problem-Centered Double-Cycles Instructional Model (PCDC-IM) (1995, Chang) to help the teacher (Lin) implement model-eliciting activity (MEA) in her mathematics classes.... The purpose of the study was to use the Problem-Centered Double-Cycles Instructional Model (PCDC-IM) (1995, Chang) to help the teacher (Lin) implement model-eliciting activity (MEA) in her mathematics classes. In this study, there were 31 students divided in 10 groups and engaged in the MEA "Who saved the oriental cherry trees". Data collections included the learning sheets, journals and debriefing forms of students, teaching and reflection journals, observation reports, and field notes of teachers, reflection journals and interview reports of researchers, video tapes and records of the classes and meetings. There were four parts of the teaching cycle in PCDC-IM, namely task, guidance, environment and analysis. We summarized developing and implementing the MEA in "Task" aspect, 5 principles and 5 kinds of teachers' roles in "Guidance" aspect, 2 elements and 5 features in "Environment" aspect and data in "Analysis" aspect. The findings showed that PCDC-IM was helpful for mathematics teachers who want to change their instruction from lecture into modeling teaching. 展开更多
关键词 Instructional model model-eliciting activity action research
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Can retrohepatic tunnel be quickly and easily established for laparoscopic liver hanging maneuver by Goldfinger dissector in laparoscopic right hepatectomy? 被引量:3
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作者 Liu-xin CAI Fang-qiang WEI +1 位作者 yi-chen yu Xiu-jun CAI 《Journal of Zhejiang University-Science B(Biomedicine & Biotechnology)》 SCIE CAS CSCD 2016年第9期712-721,共10页
Objective: The liver hanging maneuver (LHM) is rarely applied in laparoscopic right hepatectomy (LRH) because of the difficulty encountered in retrohepatic tunnel (RT) dissection and tape positioning. Thus far ... Objective: The liver hanging maneuver (LHM) is rarely applied in laparoscopic right hepatectomy (LRH) because of the difficulty encountered in retrohepatic tunnel (RT) dissection and tape positioning. Thus far no report has detailed how to quickly and easily establish RT for laparoscopic LHM in LRH, nor has employment of the Goldfinger dissector to create a total RT been reported. This study's aim was to evaluate the safety and feasibility of establishing RT for laparoscopic LHM using the Goldfinger dissector in LRH. Methods: Between March 2015 and July 2015, five consecutive patients underwent LRH via the caudal approach with laparoscopic LHM. A five-step strategy using the Goldfinger dissector to establish RT for laparoscopic LHM was adopted. Perioperative data were analyzed. Results: The median age of patients was 58 (range, 51-65) years. Surgery was performed for one intrahepatic lithiasis and four hepatocellular carcinomas with a median size of 90 (40-150) mm. The median operative time was 320 (282-358) min with a median blood loss of 200 (200-600) ml. Laparoscopic LHM was achieved in a median of 31 (21-62) min, and the median postoperative hospital stay was 14 (9-16) d. No transfusion or conversion was required, and no severe liver-related morbidity or death was observed. Conclusions: The Goldfinger dissector is a useful instrument for the establishment of RT. A five-step strategy using the Goldfinger dissector can quickly and easily facilitate an RT for a laparoscopic LHM in LRH. 展开更多
关键词 Retrohepatic tunnel Liver hanging maneuver Goldfinger dissector Laparoscopic right hepatectomy
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Experimental demonstration of switching entangled photons based on the Rydberg blockade effect 被引量:2
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作者 yi-chen yu Ming-Xin Dong +3 位作者 Ying-Hao Ye Guang-Can Guo Dong-Sheng Ding Bao-Sen Shi 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2020年第11期20-26,共7页
The long-range interaction between Rydberg-excited atoms endows a medium with large optical nonlinearity.Here,we demonstrate an optical switch to operate on a single photon from an entangled photon pair under a Rydber... The long-range interaction between Rydberg-excited atoms endows a medium with large optical nonlinearity.Here,we demonstrate an optical switch to operate on a single photon from an entangled photon pair under a Rydberg electromagnetically induced transparency configuration.With the presence of the Rydberg blockade effect,we switch on a gate field to make the atomic medium nontransparent thereby absorbing the single photon emitted from another atomic ensemble via the spontaneous fourwave mixing process.In contrast to the case without a gate field,more than 50%of the photons sent to the switch are blocked,and finally achieve an effective single-photon switch.There are on average 1-2 gate photons per effective blockade sphere in one gate pulse.This switching effect on a single entangled photon depends on the principal quantum number and the photon number of the gate field.Our experimental progress is significant in the quantum information process especially in controlling the interaction between Rydberg atoms and entangled photon pairs. 展开更多
关键词 Rydberg blockade entangled photon quantum switch
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