Objective To investigate the implementation and application of rotational DSA dual volume technology in displaying the intracranial artery stent.Methods Firstly,the “stent opacity”single volume technology was used to display 5 types of stent which were released in 7 cases of pure intracranial artery stenting and 12 cases of stent-assisted aneurysm embolization.Then we applied “vessel translucent”and “vessel opacity”single volume technology to display corresponding vessel segments.Finally,by coalescing the single volume imaging of stent and vessel,the “vessel opacity + stent opacity”dual volume image and “vessel translucent+ stent opacity”dual volume image were performed.We compared the effects of two kinds of dual volume imaging and assessed the imaging characteristics and influencing factors of each method.Results (1)On the “stent opacity”single volume display mode,in 7 cases of pure intracranial artery stenting,the display effect of two Pipeline stents and three Apollo stents belongs to level 1,the display effect of two Enterprise stents belongs to level 2;In 12 cases of stent-assisted aneurysm embolization,in the stent segments which weren’t influenced by artifacts,the display effect of two LEVIS stents belongs to level 1,the display effects of 5 Enterprise stents and 2 Solitaire AB stents belongs to level 2;While in the stent segments which were influenced by the artifact of spring coil and bone,the display effect significantly reduced, three pieces of Enterprise stents were even unable to identify.(2)On the “vessel opacity”single volume display mode,1 9 cases of vessel segment at the stent completed opacity display.The surface structure of vessel was very clear,but the structure under the surface was completely being covered.On the “vessel translucent”single volume display mode,the surface structure of 19 cases of vessel segment at the stent displayed clear at the tangential position.The vessel lumen also presented transparent state.(3)On the “stent opacity+vessels opacity”double volume display mode,the start-stop location and the adherence of stents in blood vessels in 1 6 cases were displayed clearly. When using the “stent opacity+ vascular opacity”double volume imaging,except 3 cases which used ball expansion Apollo stents could display comprehensive relationship between the blood vessels,in the other 13 cases,the relationship between stent and vascular could not be fully displayed.Conclusion On the condition that the single volume display technology shows stent well,the “stent opaque+vessels translucent”double volume display technology can well present the stent condition in the vessels.

Objective:To discuss the curative effect of bifid triple viable capsules in the patients after laparoscopic cholecystecto-my ( LC) . Methods:Totally 100 cases of patients with LC were selected and divided into the observation group and the control group at random. The patients in the two groups underwent LC under the general anesthesia, and were given routine medical treatment after the operation. The patients in the observation group were additionally given bifid triple viable capsules, 630mg per time, twice a day for 1 week as the treatment course. The changes in the occurrence of diarrhea, alteration of intestinal flora and plasma D-lactic acid of the patients and drug adverse reactions in the two groups were observed and compared after the medical treatment. Results:One week after the operation, the occurrence of diarrhea and alteration of intestinal flora of the patients in the observation group were lower than those in the control group (P<0. 05), and compared with those before the treatment, the plasma D-lactic acid levels of the patients in the two groups were declined (P<0. 05 or P<0. 01), and the declining rate in the observation group was much higher than that in the control group (P<0. 05). Totally 3 and 5 cases of drug adverse reactions were appeared in the observation group and the control group, respectively with no significant difference (P>0. 05). Conclusion: The application of bifid triple viable capsules in the pa-tients after LC can effectively reduce the plasma D-lactic acid levels, occurrence of diarrhea and alteration of intestinal flora with prom-ising security, which is good for the postoperative recovery of the patients.

Objective To improve the sensitivity of PCR for studying the rifampin resistant gene (rpoB) of M.Leprae from clinical samples.Method After comparing the results of PCR with Q-Solution (PCR Enhancer) and without Q-solution,Nested-PCR was then applied for the detection of rpoB gene.Results Although PCR Enhancer improves the amplification of rpoB gene, the sensitivity of routine PCR is only 45. 2%.The sensitivity of Nested-PCR for detecting mutants in rpoB gene can further increase to 90.5% after selection of optimum parameters.Conclusion The combinaion of PCR Enhancer and Nested-PCR improves the sensitivity and specificity of PCR for detection of rifampin resistant gene of M. Leprae.

This paper introduces the applications of Computer Assisted Orthopaedic Surgery (CAOS), including pre-operative planner, surgical simulator, intra-operative navigation systems and medical robotics. Basic principals of surgical navigation are also discussed. In view of the high precision requirement for navigation assisted procedures, there exists a definite need for development of medical robotics to carry out these procedures. We have a brief review on the different robot systems and present the surgical navigation arm developed in the Chinese University of Hong Kong. The laboratory test results of navigation guided distal targeting of intramedullary nail with or without surgical navigation arm showed the better repeatability and precision when the robot arm was used. So far the surgical navigation arm has been successfully applied in clinical practice, including distal targeting of intramedullary nailing; percutaneous sacro-iliac screw and percutaneous trans-iliac screw in pelvic fractures and hip screw fixation for fracture of femoral neck. To conclude, medical robotics is an essential component of the future CAOS.

Objective To evaluate the efficacy between cylindrical abdominoperineal resection(CAPR)by laparoscopy and traditional abdominoperineal resection(APR). Methods A retrospectively analysis was done in the data of patients with low rectal cancer who underwent APR in our department from January 2010 to September 2015. The patients were divided into two groups,including cylindrical abdominoperineal resection by laparoscopy and traditional abdominoperineal resection. The operation time,intraoperative bleeding,the time of intestinal exhaust as well as the postoperative complications of the two groups were compared. Results There were no statistical differences in the intraoperative bleeding,operation time,the time of intestinal exhaust,postoperative intestinal obstruction and pulmonary infection between the two groups(P > 0.05). However,the differences in the rates of perineal incision infection and tumor intestinal perforation between the two groups were statistically significant (P < 0.05). Conclusion CAPR by laparoscopy is safer,more reliable than traditional APR,which can effectively reduce the rates of postoperative incision infection and tumor intestinal perforation of patients.

Objective To explore the differences and development of executive function(EF) between cerebral palsy(CP) children and normal children. Methods Forty-eight 4 ～6 years old CP children and fiftyeight normal children were tested by "cool" and "hot" EFs. Results There were significant differences between "cool" EF of CP children(18.34±14.31) and normal children(6.94 ±3. 18) ( t = 3. 83, P<0.01 ) ;and there were significant differences between "hot" EF of CP children(279.67 ±330. 18) and normal children(709.31 ± 304. 13)( t = -4.93, P< 0.01). There were significant age differences on the "cool" EF ( F=8.689, P< 0.01) and "hot" EF ( F=3. 833, P<0.05) of CP children. There were significant age differences on the "cool" EF ( F= 15.469, P<0.01) and on the "hot" EF ( F=8.470, P<0.01) of normal children. There was negative correlation between "cool" EFs and "hot" EFs( r= -0.440, P<0.01). Conclusion "Cool" and "hot" EFs of CP children are lower than those of normal children. "Cool" and "hot" EFs can develop from 4 to 6 years old,but the development of EFs are not absolutely consistent between CP children and normal children. There is correlation between "cool" and "hot" EFs in patients with CP,but not dissociation.

Aim: To search for novel modulators of glycogen metabolism through structural modifications of natural pentacyclic triterpenes. Methods: A series of N-heterocyclic derivatives were synthesized by fusing indole, qui-noxaline and pyrazine rings with A-ring of oleanolic and ursolic acids. The compounds were biologically evaluated for their inhibitory activity against rabbit muscle glycogen phosphorylase. Results and Conclusion: Twelve heter-ocyclic triterpene derivatives were synthesized and their structures were confirmed by IR, ~1H NMR, ~(13)C NMR and MS. Except for compound 12, all of the compounds exhibited glycogen phosphorylase inhibitory activity with IC_(50) values in the range of 14-252 μmol/L Among this series of compounds, compound 15 showed the best potency with IC_(50), of 14 μmol/L

BACKGROUND:Although there is a certain progress in the preparation of tissue-engineered bone tissue using a variety of materials, some deficiencies have appeared such as mismatching between scaffold degradation rate and new bone formation rate, slow tissue growth, toxic metabolites.
OBJECTIVE:To build a new type of inducible bone repair composite scaffold with bionic bone structurematerials and to evaluate its physicochemical and biological properties.
METHODS: Icarin encapsulated by chitosan was used to prepare drug-loaded microspheres, and the drug release rate of the microspheres was detected. Chitosan microspheres were mixed with colagen to build the core part of scaffold materials. Hydroxyapatite (HA), polycaprolactone (PCL) and colagen were mixed in hexafluoride isopropanol (HFIP) to prepare the HA/PCL/colagen outer part of composite scaffold material at the rate of 0:3:3, 1:3:3, 2:3:3, 3:3:3. Each proportional electrospinning was used for one layer, and finaly the 4-layer outer tube of the scaffold was produced. The tube core and outer tube were crosslinked by 1% genipin. Universal material testing machine, surface contact angle meter, infrared spectroscopy, scanning electron microscope, water absorption, permeability, porosity,in vitro degradation tests for cross-linked and uncross-linked were used to observe the structure and characteristics of tubular materials. Bone marrow mesenchymal stem cels were seeded on the surface of cross-linked and uncross-linked bone repair materials to evaluate the biocompatibility of the scaffolds. Cross-linked and uncross-linked bone repair materials were implanted subcutaneously into Wistar rats to evaluate the histocompatibility of the scaffolds.
RESULTS AND CONCLUSION:The drug in the scaffold had a suitable release; the bone scaffold material had good uniformity, and cross-linked scaffolds materials had better mechanical properties, water absorption and permeability than the uncross-linked(P < 0.05). The degradation rate of the cross-linked group was significantly lower than that of the uncross-linked group (P< 0.05). Hematoxylin-eosin staining showed that the bone marrow mesenchymal stem cels could adhere wel to the cross-linked and uncross-linked materials. No inflammatory reactions occurred after subcutaneous implantation of cross-linked and uncross-linked materials. These findings indicate that the cross-linked scaffold for inducible bone tissue engineering has good biocompatibility and mechanical properties.

Objective To establish a quick electrochemical biosensor for the detection of nucleic acid of Ebola virus . Methods The DNA tetrahedral nanostructure was self-assembled on gold surface by strong Au-S chemical bonds , leaving the target probe at the top .A biotinylated-ssDNA was introduced as the detection probe by specific binding of the captured target sequence , before avidin-horseradish peroxidase ( HRP) was used as a signal amplifier to transduce amperometric sig-nal through interactions with TMB substrate .Results The results indicated that the nucleotide sequence of Ebola virus could be recognized and detected by the sensor .The linear range for the detection of target DNA was from 1.0 ×10 -9 to 5.0 ×10 -6 mol/L,and the detection limit was 5.2 ×10 -10 mol/L.Conclusion The fabricated sensor is demonstrated to be sensitive and specific for the detection of Ebola virus nucleotide .

Objective To assess the clinical value and safety of endoscopic mucosal resection (EMR) and endoscopic submucosal dissection (ESD) for duodenal lesions.Methods The data of 12 patients with duodenal space-occupying lesions underwent EMR or ESD from January 2010 to December 2015 in Chinese PLA General Hospital were retrospectively analysed.Results All patients received operation, including 9 male and 3 female with mean age of 50.0 years(33.0-62.0 years).There were 8 lesions in duodenal bulb and 4 in descending part.The mean diameter of the lesions was 1.2 cm (0.5-3.0 cm).Three lesions were originated from mucosa, of which 2 were high-grade intraepithelial neoplasia and 1 was villous/tubular adenoma.Nine lesions were located in submucosa, including 3 cases of neuroendocrine neoplasm, 1 case of stromal tumor, 1 liomyoma case, 1 lipoma case, 1 case of Brunner glands adenoma, 1 case of ectopic pancreas, and 1 inflammatory lesion.One patient had perforation with rate of 8.3%(1/12) and was recovered after conserved treatment.The bleeding was very little during operation.No infection or stenosis happened.The mean hospitalized time was 6.0 days (1.0-12.0 days) after operation.No recurrence was found during 23.8 months(3.0-73.0 months) of follow-up.Conclusion EMR and ESD are effective and safe for treatment of duodenal space-occupying lesions.