ObjectiveTo review the biological characteristics of self-assembling peptide nanofiber scaffold (SAPNS) and its potential to induce bone repair. MethodsThe literature regarding SAPNS and its application in bone repair was extensively analyzed and reviewed. ResultsSAPNS is derived from natural amino acids, and has the properties of good biocompatibility and non-toxic degradation products. Their microenvironment highly mimics the natural extracellular matrix, and controlled release of growth factors as well as modification with functional motifs can substantially improve their bioactivity. Many studies on cell composite culture and bone defect repair of animal models reveal that SAPNS has the ability to promote the function of bone cells (e.g. adherence, proliferation, and differentiation) in vitro, and enhance new bone tissue formation in vivo. ConclusionSAPNS may be an ideal material for bone repair, but its biologically mechanical properties need further improvement.
ObjectiveTo investigate the feasibility and security of laparoscopic Whipple pancreaticoduodenectomy(LPD)or laparoscopic pylorus preserving pancreaticoduodenectomy(LPPPD)for the patients with periampullary diseases, estimate the ratio of postoperative complications between LPD and LPPPD. MethodsFourty-five patients who underwent the LPD or LPPPD from January 2010 to March 2014 were reviewed retrospectively. These patients were divided into LPD group and LPPPD group basing on the Whipple or polyrus preservation. ResultsAmong these 45 patients, 25 patients were performed the LPD, the other 20 patients were performed the LPPPD. There were 25(55.56%)complications after operation, including 10 cases of pancreatic fistula, 1 case of bile leakage, 6 cases of delayed gastric emptying, 3 cases of infection, 2 cases of stomach intestine stomatorrhagia, 1 case of mesenteric venous thrombosis, 1 case of ascites, 1 case of chylous fistula. The complication rate had no significant difference between two groups. One patient died after operation in the LPPPD group. ConclusionLaparoscopic pancreaticoduodenectomy is safe and feasible in the treatment of periampullary diseases, the LPPPD could partly prevent the occurrence of reflux of the digestive juice following the resection of pylorus and improve the quality of life.