With the development of science and technology, new medical equipments is toward the direction of intelligent and portable. In order to assist medical personnel to patients with blood, developing from previous devices, a new kind of vein locating projection instrument based on two-dimensional scanning mirror is put forward. It can scan and project vein image using a scanning mirror. The related algorithm is also be improved, make vein scan projection more practical. The system finally set up can perform well in vein scan projection.
Algorithms ; Diagnostic Imaging ; instrumentation ; Humans ; Veins ; anatomy & histology

Objective To discuss the formation mechanism of teardrop fracture of the axis and observe the clinical efficacy of anterior or posterior induction operation according to the fracture type.Methods Thirteen patients with teardrop fracture of the axis treated from May 2001 to October 2010 were involved in the study.There were 10 males and 3 females,at age range of 18-55 years (mean,35.5 years).Four patients were combined with cervical spinal cord injury (one patient with grade C and two with grade D according American Spinal Injury Association,ASIA).Injury causes included traffic injury in 11 patients and fall from height in two.After admission,the anteroposterior,lateral and mouth X-ray films,spiral CT sagittal reconstruction and MRI examination of the cervical vertebra were performed in all the patients.According to the injury mechanism,there were 10 patients with extension fractures treated with C2,3 intervertebral bone fusion and internal fixation through submandibular retropharyngeal approach and three with flexion fractures treated with posterior C2,3 intervertebral bone fusion and pedicle screw fixation.The clinical efficacy was also observed. Results All patients received complete exposure and effective reduction and fixation.The average time of anterior exposure and posterior exposure was 77 minutes and 125 minutes,respectively.No surgical complications occurred.All patients were followed up for 9-34 months (mean,13 months).Reexamination at four months after operation displayed bone healing in all patients.There was no lessening or breakage of the internal fixators.The spinal function of three patients with ASIA grade D injury and that of one patient with ASIA grade C injury recovered to normal at postoperative 1.5 and 6 months respectively. Conclusion The surgical approaches for teardrop fracture of the axis developed in the light of the fracture formation mechanism are beneficial and safe.

Objective To investigate the feasibility and clinical effect of the posterior single segment anterolateral decompression and anterior column reconstruction in the treatment of thoracolumbar burst fractures. Methods A retrospective study was done on 21 patients with type Denis B thorocalumbar burst fractures who were treated by posterior approach minimal incision pedicle SCreW fixation,single segment anterolateral decompression and titanium mesh and bone graft from August 2007 to August 2009.There were 15 males and six males at mean age of 35.6 years(range,23-50 years).The involved segments included T12 in six patients,L1 in 11,L2 in three,and L3 in one.The preoperative spinal canal enemachment rate was 62.5%and the anterior-middle vertebral compression of all patients was less than 50%.CT scanning showed normal vertebral body and inferior endplate structure.The fracture reduction,graft fusion,neurological function recovery,correction loss,lumbar activities and adjacent lumbar disc degeneration were observed through preoperative,immediate postoperative and final follow up X-ray,CT and neurological examinations. Results The operation duration was 1.5-3.2 hours(average 2.1hours),with the bleeding of 350-1 000 ml(average 580 ml).All the patients were followed up for 4-26months(average 10.3 months),which showed that the vertebral fusion time was 4-6 months,with no loss of the vertebral height,implant breakage,loosening or extrusion.The nerve function was improved for 1-2 grades. Conclusions With correct selection of the indications,the posterior single segment anterolateral decompression and anterior column reconstruction is a reliable fixation,for it takes advantages of simple operation,minor trauma,less fusion segments and fast recovery.

Objective:To investigate the efficacy of single time intra-articular different concentration of allogeneic bone marrow mesenchymal stem cells ( BM-MSCs ) injection in the treatment of Sprague-Dawley ( SD) rat model of osteoarthritis ( OA) .Methods: In the study, 32 SD rats were equally ran-domized into 4 groups:control group, high concentration group (1 ×107/mL BM-MSCs), low concentra-tion group (5 ×106/mL BM-MSCs) and high vs.low concentration group.The two knees of each rat were set up to a pair.The induction of OA was performed surgically randomly at one side in model group, and bilaterally in the other groups, which were through anterior cruciate ligament transaction ( ACLT) and medial meniscus excising.After the operation, the SD rats were allowed free movement.Four weeks later, different concentrations of allogeneic BM-MSCs isolated from the SD rats, expanded in vitro and suspended in phosphate buffered solution( PBS) were delivered in the articular cavity of both knees;PBS was used as the control.After injection, we excised the femoral nerve and sciatic nerve to disuse the low limb.The cartilage histological sections of knees were scored by Mankin scoring system to assess the se-verity of the pathology.mRNA of collagen Ⅱwas detected by real time polymerase chain reaction ( RT-PCR) .eGFP was detected by fluorescence microscope.Assessments were carried out 4 weeks after the operation in model group, and 3 weeks after injection in the other groups.Results:Mankin scores of the BM-MSCs side and control side were 6.60 ±0.40 vs.10.00 ±0.32 in low concentration group ( P<0.05), and 5.40 ±0.51 vs.9.60 ±0.51 in high concentration group (P<0.05).Mankin scores of high sv.low concentration group were 6.40 ±0.51 vs.7.60 ±0.75 (P>0.05).mRNA expression of collagen Ⅱ of the BM-MSCs side in low concentration group was 106%±1%in contrast to the control side.As in high concentration group it was 108%±1%, and 102%±1%in high vs. low concentra-tion group.Labeled BM-MSCs were detected unexpectedly in the synovial membrane but not in cartilage tissue three weeks from injection.Conclusion:BM-MSCs could promote cartilage repair and inhibit OA progression through a trophic mechanism.There was no difference between the two concentrations.

Objective:To screen the new candidate molecules interacting with protein kinase Wee1B by yeast two hybrid system, and to analyze their interaction with Wee1B in the early stage of mouse fertilized eggs by bioinformatics.Methods:The plasmid pcDNA3.1/V5-His-TOPO-Wee1B wild type encoding mouse Wee1B gene was used as template to construct bait plasmid pGBKT7 Wee1B and the bait plasmid pGBKT7-Wee1B was transformed into yeast competent cells at SD/Trp (SDO),SD/Trp/X-α-Gal (SDO/X)and SD/Trp/X α Gal/AbA plates (SDO/X/A)plates to detect the toxicity and self-activation ability of yeast and its expression in yeast using Western blotting method.The yeast cells containing pGBKT7-Wee1B were fused with human ovary cDNA library, the yeast plasmid transformation of Escherichia coli positive clones were sequenced after identified by yeast transformation.BLAST analysis was carried out in GenBank,and its effect on the development of mouse fertilized eggs was deduced according to the gene annotation.Results:The double enzyme digestion analysis and sequencing analysis results showed that the pGBKT7-Wee1B bait plasmid was successfully constructed.The plasmid was transformed into the yeast,and there were no clones in the SDO/X/A plates.The pGBKT7-Wee1B and pGBKT7 empty vectors were transformed into the yeast,the bacteria were inoculated on the SDO plates,and the clones were uniformly grown on the two SDO plates.The positive clones were picked and expanded in culture,the protein was extracted and Western blotting showed that pGBKT7 Wee1B was expressed in the yeast.The bait plasmids were fused with human ovary cDNA library and the positive clones inserted into the fragment were identified by PCR. Nine proteins which interacted with Wee1B protein kinase were screened out by sequencing and blast analysis,and the proteins which could be closely related to the development of mouse oocytes and the development of fertilized eggs were analyzed by bioinformatics analysis.Conclusion:Using the yeast two hybrid system from human ovary cDNA library,nine interacting proteins with Wee1B protein kinase are screened and these screened proteins may regulate mouse oocyte maturation and early embryo development through interacting with Wee1B.

Objective To evaluate the value of intermittent splenic artery occlusion in the treatment of iatrogenic splenic injury and the cause of ischemia reperfusion injury.Methods Experimental animals using dogs were divided into experimental group and control group according to whether the splenic artery was blocked.The animal model of iatrogenic splenic injury was established by general anesthesia.Experimental group was treated with intermittent splenic artery blockage combined with gelatin sponge oppression of the wound to stop bleeding.The first time of splenic artery occlusion was 15 min and continued for 10 min and for another 5 rmin if still bleeding.Then hemostatic effect after removing blocking and oppression was observed.Control group was only treated with gelatin sponge compression to stop bleeding.Blood samples and tissue samples were collected before blocking and after reperfusion for 2 hours in experimental group,and before compression and relieving the compression for 2 hours in control group.IL-1 (interleukin),SOD (superoxide disproportionation enzyme),MPO (myeloperoxidase),MDA (malondialdehyde) and caspase-3 (aspartame acid cysteine protease) were detected.Results The control group still had bleeding,while the experimental group had successfully stopped bleeding.Serum markers before and after occlusion in the experinental group were IL-1 (124.4 ± 106.8 vs.121.2 ± 105.1),SOD (4.7 ± 2.7 vs.5.2 ± 1.8) and MDA (8.8 ±6.5 vs10.8 ±7.5).There were no significant differences on serum markers in two groups after occlusion/oppression including IL-1 (121.2 ± 105.1 vs.162.8 ± 73.8),SOD (5.2 ± 1.8 vs.4.7 ± 2.8) and MDA (10.8 ±7.5 vs.9.6 ±6.6) (P＞0.05).Histological indicators before and after occlusion in the experimental group included MPO (0.62 ±0.23 vs.0.68 ±0.21) and Caspase-3 (0.90 ±0.29 vs.0.86 ± 0.26),and there was no statistical difference on MPO (0.68 ±0.21 vs.0.86 ±0.23 after two sets of experiments) and Caspase-3 level (0.86 ± 0.26 vs.1.21 ± 0.18) (P ＞ 0.05) in two groups after occlusion/ oppression.Conclusion The therapeutic effect of intermittent splenic artery occlusion combined with gelatin sponge compression hemostasis is safe and effective and without obvious ischemia reperfusion injury.

Objective:To investigate the effect of early enteral nutrition combined with Bacillus in the treatment of patients with digestive tract perforation.Methods:59 patients with emergency digestive tract perforation were randomly divided into experimental group (EN plus Bacillus,n =31) and control group (TPN,n =28).The patients in the experimental group were given enteral nutrition plus Bacillus after first days (＜ 24 h),and the control group was treated with parenteral nutrition support on the first day after surgery.The average hospitalization time,length of ICU stay,incidence of complications,and serum C-reactive protein in the two groups were analyzed.Results:The average length of hospitalization time,ICU stay,recovery of bowel function and eating time were significantly shorter in the experimental group than in the control group(P ＜ 0.05).There was no significant difference in nutrition index between the two groups during the perioperative period (P ＞ 0.05).The C-reactive protein in the experimental group was significantly lower than that in the control group fourth days after operation (P ＜ 0.05).The incidence of postoperative wound infection in the experimental group was significantly lower than that of the control group (P ＜ 0.05).There was no significant difference in the incidence of other complications.Conclusion:Early administration of enteral nutrition combined with Bacillus can significantly shorten the intestinal function recovery time,decreasethe average hospitalization days,reduce the postoperative wound infection rate and thus improve the outcome of patients with digestive tract perforation.

OBJECTIVEThe purpose of this study was to investigate the influence of cryogenic treatment and age-hardening heat treatment on the micro-Vicker's hardness of palladium-silver dental alloys.

METHODSA low-gold content dental casting alloy composed of Ag-Pd-Cu-Au was prepared for this study. Experimental specimens according to standard requirements were prepared following a standard dental laboratory casting procedure, cast specimens were heated to 900 degrees C and quenched in ice water. The specimens were then divided into 4 groups. They were subsequently subjected to different treatments, including age-hardening heat treatment, cryogenic treatment, heat treatment combined with cryogenic treatment. The non-treated group was used as control. The micro-Vicker's hardness value was examined. The significance of correlation was analyzed.

RESULTSThe micro-Vicker's hardness of specimens after age-hardening heat treatment, cryogenic treatment, heat treatment combined with cryogenic treatment increased by 129%, 13% and 141%, respectively, compared with that of the non-treated control group. Conclusion Age-hardening heat treatment and cryogenic treatment were effective in elevating the hardness of Ag-Pd-Cu-Au alloy.

BACKGROUND: Endoplasmic reticulum (ER) stress has been proved to be related to the occurrence of diabetes, dilated cardiomyopathy and neurodegenerative diseases. Indeed, it is closely associated with osteoarthritis. OBJECTIVE: To explore the effect of ER stress on the chondrocyte viability as well as the occurrence and development of osteoarthritis in rats. METHODS: Rat chondrocytes were isolated and cultured, and the ER stress in the rat chondrocytes was by 10 mg/L tunicamycin. The expression levels of ER stress markers C/EBP-homologous protein and 78 kDa glucose-regulated protein were detected by western blot assay, and the proliferation and apoptosis of chondrocytes were detected by cell counting kit-8 assay and AnnexinV-FITC flow cytometry, respectively. In the in vivo experiment, 15 Sprague-Dawley rats were selected and subjected to anterior cruciate ligament transection and medial meniscectomy to establish an animal model of osteoarthritis. Tunicamycin, tauroursodeoxycholic acid and PBS (blank control group) were respectively injected into the articular cavity, and then the progression of osteoarthritis was assessed by hematoxylin-eosin staining at 4 weeks after treatment. RESULTS AND CONCLUSION: After addition of tunicamycin, the expression levels of C/EBP-homologous protein and 78 kDa glucose-regulated protein were significantly upregulated, the viability of chondrocytes was decreased gradually, while the apoptotic rate was increased significantly. Results from gross observation and hematoxylin-eosin staining suggested that tunicamycin promoted the progression of osteoarthritis and tauroursodeoxycholic acid delayed the deterioration of cartilage in the rats. These findings indicate that ER stress results in the decreased chondrocyte viability and increased apoptosis, which may be an important pathogenesis of osteoarthritis. Additionally, tauroursodeoxycholic acid can effectively alleviate osteoarthritis induced by ER stress.

BACKGROUND:In recent years,the treatment of anterior cruciate ligament injury has become more and more mature.However,there are still disputes about the timing of surgery,the choice of surgical methods,the choice of grafts,and the methods to promote graft healing after anterior cruciate ligament injury. OBJECTIVE:To summarize the latest research progress of surgical timing,surgical methods,graft selection and methods to promote graft healing after anterior cruciate ligament injury,and to find new treatment directions for anterior cruciate ligament injury. METHODS:Relevant articles concerning anterior cruciate ligament injury were retrieved from PubMed,CNKI,WanFang Date,VIP,SinoMed,ScienceDirect,Springer and Cochrane Library.After the screening,72 related articles were finally included. RESULTS AND CONCLUSION:(1)Surgical timing:Compared with delayed anterior cruciate ligament reconstruction,early reconstruction can reduce meniscus injury,elevate quality of life,and improve functional recovery.However,it is still uncertain whether the different operation timing will accelerate cartilage injury.(2)Surgical methods:Arthroscopic anterior cruciate ligament reconstruction is a common surgical method for anterior cruciate ligament injury.Dynamic internal stabilization repair of anterior cruciate ligament can bring similar results to traditional anterior cruciate ligament reconstruction in short-term and long-term effects.(3)Graft selection:Autogenous hamstring tendon is the first choice of anterior cruciate ligament graft,while bone-patellar tendon-bone grafts and allografts are the secondary choices.(4)Among the methods to promote graft healing,suture band strengthening can increase knee joint stability and ensure graft healing.Stem cells promote the tendon-bone healing of grafts through anti-inflammatory action,angiogenesis,inhibition of osteolysis and promotion of chondrocyte differentiation.Preserving the residual end of the anterior cruciate ligament can maintain the stability of the knee joint,promote the recovery of proprioception,and provide a prerequisite for the healing of the graft.The effectiveness of platelet-rich plasma in promoting graft healing remains to be discussed.However,biomaterials,gene therapy,stem cell application and other methods to promote tendon healing remain in the stage of molecular and animal researches.Clinical transformation is also needed in the future.