ObjectiveTo design and produce a lesser trochanteric reduction fixation system and verify its value and effectiveness. MethodsA lesser trochanteric reduction fixation system was designed and produced according to the anatomical features of the lesser trochanteric fractures. Sixty-six patients with intertrochanteric fractures of Evans type Ⅲ were included between January 2010 and July 2012. Of 66 patients, 32 were treated with dynamic hip screw (DHS) assisted with the lesser trochanteric reduction fixation system (study group), and 34 cases were treated with DHS only (control group). The 2 groups were comparable with no significant difference in gender, age, the reasons, and the types of the fractures (P>0.05). The operation time, intraoperative blood loss, neck-shaft angle, bone healing time, ratio of successful fixations, and the functional evaluation of the hip joint after operation were compared between 2 groups. ResultsThe study group had shorter operation time [(58.4±5.3) minutes] and less intraoperative blood loss [(186.3±6.6) mL] than the control group[(78.5±6.2)minutes and (246.2±8.7) mL], showing significant differences (t=-14.040, P=0.000; t=-31.145, P=0.000). There was no significant difference in neck-shaft angle between study group [(138.6±3.0)°] and control group [(139.4±2.9)°] (t=-1.044, P=0.301). The wounds healed by first intention in both groups. The 30 and 31 patients were followed up 12 to 24 months (mean, 15 months) in the study group, and 13 to 25 months (mean, 16 months) in the control group, respectively. All fractures healed well in 2 groups. The study group had significantly shorter healing time [(8.8±2.0) weeks] than the control group [(10.7±3.4) weeks] (t=-2.871, P=0.006). At 12 months after operation, coxa vara happened in 2 cases of the study group with a successful fixation ratio of 93.3% and in 10 cases of the control group with a successful fixation ratio of 67.7%, showing significant difference (χ2=6.319, P=0.022). According to Harris hip score, the excellent and good rate was 83.3% in the study group (25/30) and was 58.1% in the control group (18/31), showing significant difference (χ2=4.680, P=0.049). ConclusionThe application of the lesser trochanteric reduction fixation system can reduce stripping of the soft tissue around the fracture fragments, shorten the operation time and the healing time, and preserve the function of the hip joint maximumly.
The aim of this research is to investigate the influence of microencapsulation on the expression of the oxidative stress genes and exogenous regulation of HepG2 cells. We compared the expression of hemeoxygenase-1 (HO-1) and glutathione S-transferases-A1 (GST-A1) in HepG2 cells under different culture conditions through real-time PCR. The effects of exogenous antioxidants on cell viability and albumin levels were also evaluated through MTT assay and ELISA assay. The results showed that after culturing for 6 and 16 days, the expression levels of HO-1 in encapsulated cells were approximately 4.9 and 3.1 times higher than that of monolayer cells at the same culture period; As for the expression levels of GST-A1, they were elevated to 11.2 and 33 times of monolayer cells (P<0.05). Accordingly, we found that NAC at 5-10 mmol/L significantly increased the viability by 40%-70% and the biosynthetic function by 20%-30% in microencapsulated HepG2 cells (P<0.05). GSH increased the viability of the encapsulated cells by 20%-55% and the biosynthetic function by 15% (P<0.05). In conclusion, oxidative stress exists in the microcapsules and affects genes expression. Exogenous antioxidants can prevent the inhibition effects of oxidative stress on cellular growth.
The present paper proposed a central-driven structure of upper limb rehabilitation robot in order to reduce the volume of the robotic arm in the structure, and also to reduce the influence of motor noise, radiation and other adverse factors on upper limb dysfunction patient. The forward and inverse kinematics equations have been obtained with using the Denavit-Hartenberg (D-H) parameter method. The motion simulation has been done to obtain the angle-time curve of each joint and the position-time curve of handle under setting rehabilitation path by using SolidWorks software. Experimental results showed that the rationality with the central-driven structure design had been verified by the fact that the handle could move under setting rehabilitation path. The effectiveness of kinematics equations had been proved, and the error was less than 3°by comparing the angle-time curves obtained from calculation with those from motion simulation.
Based on the structure and motion bionic principle of the normal adult fingers, biological characteristics of human hands were analyzed, and a wearable exoskeleton hand function training device for the rehabilitation of stroke patients or patients with hand trauma was designed. This device includes the exoskeleton mechanical structure and the electromyography (EMG) control system. With adjustable mechanism, the device was capable to fit different finger lengths, and by capturing the EMG of the users’ contralateral limb, the motion state of the exoskeleton hand was controlled. Then driven by the device， the user’s fingers conducting adduction/abduction rehabilitation training was carried out. Finally, the mechanical properties and training effect of the exoskeleton hand were verified through mechanism simulation and the experiments on the experimental prototype of the wearable exoskeleton hand function training device.
The booming three-dimensional laser scanning technology can efficiently and effectively get spatial three-dimensional coordinates of the detected object surface and reconstruct the image at high speed, high precision and large capacity of information. Non-radiation, non-contact and the ability of visualization make it increasingly popular in three-dimensional surface medical mapping. This paper reviews the applications and developments of three-dimensional laser scanning technology in medical field, especially in stomatology, plastic surgery and orthopedics. Furthermore, the paper also discusses the application prospects in the future as well as the biomedical engineering problems it would encounter with.
Objective To systematically evaluate the effect and safety of systemic corticosteroids for acute exacerbation of chronic obstructive pulmonary disease (COPD). Methods Databases including PubMed, EMbase, The Cochrane Library (Issue 6, 2015), Wanfang Data, CBM, CNKI were searched to collect randomized controlled trails (RCTs) about systemic corticosteroids for acute exacerbation of COPD from inception to July 2015. The meta-analysis was conducted using RevMan 5.3 software. Results A total of 11 RCTs involving 1298 patients were included. The results of meta-analysis showed that a statistically significant increase in the treatment success rate when using systemic corticosteroids (RR=1.11, 95%CI 1.01-1.21,P=0.02), and a non-significant difference of effect in the subgroup of emergency department and ICU patients (RR=0.98, 95%CI 0.90-1.08,P=0.74;RR=1.19, 95%CI 0.84-1.69,P=0.34). Conclusions Current studies suggest that systemic corticosteroids is beneficial in terms of treatment success rate, but subgroup analysis shows that this benefit is controversial in emergency department and ICU. however, due to the limited quantity of the included studies, the above conclusions still need more high quality research to be verified.
ObjectiveTo evaluate the ectopic osteogenesis of recombinant human bone morphogenetic protein 2 (rhBMP-2) loaded chitosan (CS)/dextran sulfate (DS) by micro-CT. MethodsrhBMP-2/CS/DS microspheres were prepared by the ionic crosslinking and its shape was observed under the scanning electron microscope. The release of rhBMP-2 was determined from resultant microspheres by ELISA assay. Forty-eight Sprague Dawley male rats were randomly divided into 4 groups (n=12), quadriceps muscle bag model was made, gelatin sponge (group A), CS/DS microspheres (group B), rhBMP-2 (group C), and CS/DS/rhBMP-2 microspheres (group D) were implanted into the bags respectively. The tissue samples with heterotopic ossification were harvested for micro-CT scanning at 4, 8, 12, and 16 weeks. The tissue mineral density (TMD), bone volume fraction (BVF), trabecular thickness (Tb.Th), trabecular number (Tb.N), bone mineral density (BMD), and tissue mineral content (TMC) were measured. ResultsThe prepared rhBMP-2/CS/DS microspheres with smooth surfaces were spherical and evenly disperses without obvious agglomeration. At 2 hours, microsphere started a sudden release period in vitro; the release reached a peak at 2 days; and the release cycle lasted about 20 days. The rats survived to the end of the experiment. At each time point after operation, no radiation developed and no osteogenesis was observed by three dimensional reconstruction in groups A and B. However, radioactive strength and reconstructed bone tissue gradually increased in groups C and D, and group D had more radioautography and more bone tissues than group C. At each time point, TMD, BVF, Tb.Th, Tb.N, BMD, and TMC of groups A and B were zero. Ectopic bone formed with time, the other parameters showed an increasing trend except Tb.N in groups C and D, showing significant difference when compared with groups A and B at each time point (P < 0.05). There was no significant difference between groups C and D at 4 weeks (P>0.05); the parameters of group D were significantly higher than those of group C at 8-16 weeks (P < 0.05). ConclusionrhBMP-2/CS/DS microspheres have stronger ability of ectopic bone formation than single rhBMP-2.
ObjectiveTo retrospectively investigate the medication structure and evaluate the rationality among over-60-year outpatients with lung cancer in the West China Hospital of Sichuan University in 2011. MethodsThe data was extracted from the hospital information system (HIS). Excel 2010 software was used for statistical analysis. Resultsa) The total of over-60-year outpatients with lung cancer were 17 296 person-times, of which 12 606 persons-times patients with no medication accounted for 72.88%. The monotherapy in patients with medication accounted for 75.76%. b) There were 5 types of tumour related drugs, including 56 kinds of different drugs, and the total frequency was 6 460 and the average cost was 2 219.38 yuan. The first three drugs classified by 5 types were traditional Chinese drugs (TCM, 28.50%), other therapy (24.91%), and etiological treatment (22.23%). c) For etiological treatment, tyrosine kinase inhibitors (TKI) accounted for 59.96%, and the first three drugs were gefitinib, recombinant human endostatin, and erlotinib. d) For symptomatic treatment, analgesic drugs accounted for 43.65%; and the first three drugs were tramadol hydrochloride sustained-release tablets, sodium zoledronic oxycodone, and acetaminophen. e) For ADR therapy, liver drugs accounted for 40.97%; and the first three drugs were palonosetron hydrochloride, licorice, and diammonium pantoprazole. f) Other treatment involved immunopotentiating drugs and hematopoietic growth factors, the ratios were 62.65% and 37.35%, and the first three drugs were thymalfasin, thymopentin, and recombinant interleukin-11. g) Huisheng, Banao capsule and Bailing capsule were at the first three usage in TCM, the ratios of which were 51.06%, 15.37%, and 13.91%. h) The top ten drugs were Huisheng oral liquid, gefitinib and thymus AFP, thymopentin recombinant interleukin-11, chelating compound spot capsules, recombinant human endostatin, tramadol hydrochloride extended release tablets, sodium, zole dronic, and Bailing capsule. ConclusionThe antitumor therapies were mainly TKI single drug regimen for over-60-year outpatients with lung cancer in the West China hospital of Sichuan University in 2011. The most frequently used adjuvant therapies are antalgic, antitussive and skeletal related events prevention drugs. Besides, Chinese patent medicines are in common use as well.
ObjectiveTo retrospectively investigate the drug use of over-60-year inpatients with lung cancer in the West China Hospital of Sichuan University in 2011, and to compare with outpatients with lung cancer concurrently, so as to evaluate the rationality of drug use among over-60-year inpatients with lung cancer in the West China Hospital. MethodsThe information of over-60-year inpatients with lung cancer as initial diagnosis in the West China Hospital in 2011 was collected from the hospital information system (HIS), including patient information, drug use information, cost information, etc. Data rearrangement and analysis by classes and costs were carried out using Microsoft Excel 2010 software. Resultsa) There was 2 215 person-times of over-60-year inpatients with lung cancer in the West China Hospital of Sichuan University in 2011. A total of 5 classes, 63 kinds of anti-tumor and adjuvant therapy drugs were involved. The total drug use frequency was 12 398 person-times. The average medicine cost was 774.93 yuan. b) The ratio of patients using 1 to 4 kinds of drugs was 34.31%, 5 to 10 kinds was 41.9%, and 11 to 15 kinds was 12.63%. c) For etiological treatment, the ratio of chemotherapy drugs was 99.45%, and the most used was cisplatin. d) For symptomatic treatment, the ratio of analgesics was 66.69%; the ratio of antitussive drugs was 21.33%; and the ratio of skeletal related events prevention drugs was 11.98%. e) For anti-ADR treatment, the ratio of antiemetic drugs was 55.07%; the ratio of stomach protection drugs was 32.63%; and the ratio of hepatic protection drugs was 12.30%. f) For other treatment, the ratio of immunopotentiating drugs was 59.46%; and the ratio of hematopoietic growth factor was 25.42%. g) For Chinese patent medicine, drugs used over 400 person-times were Diyushengbai tablet, Javanica oil emulsion injection, Aidi injection, and Huisheng oral liquid. h) For single/combined treatment, the ratio of two-drug combined chemotherapy was 78.38%, one analgesics drug treatment was 66.21%, one hepatic protection drug treatment was 83.41%, two-drug combined antanacathartic treatment was 45.88%, one stomach protection drug treatment was 90.53%, one immunopotentiating drug treatment was 90.53%, one hematopoietic growth factor treatment was 82.31%, and one Chinese patent medicine treatment was 37.39%, respectively; and antitussive and skeletal related events prevention drugs were used alone. i) The use frequency of the top 10 drugs were: pantoprazole, tropisetron, ondansetron, diphenhydramine, thymopentin, cisplatin, Diyushengbai tablet, tramadol, Javanica oil emulsion injection, and Aidi injection. j) Compared with outpatients, inpatients drug use frequency was higher in chemotherapy, analgesics, antiemetic, stomach protection, hepatic protection drugs, and Chinese patent medicine; but lower in skeletal related events prevention drug; and similar to the drug use situation of outpatients in immunopotentiating drugs and hematopoietic growth factor drugs. ConclusionThe antitumor therapies were mainly the combination of two chemotherapy drugs or single drug regimen for over-60-year inpatients with lung cancer in the West China hospital of Sichuan University in 2011. The most frequently used adjuvant therapies are antalgic, antiemetic and stomach protection drugs. Chinese patent medicine and immunopotentiating drugs are in common use as well.