SK302-1型X线机故障

1 302-1型500mAnX线机开机后烧RD6／5安保险管故障维修 1．1故障现象。透视中通过监视器发现束光器x线窗口大小不受调节，检查后发现，开机后烧RD6／5安保险管，换新保险管后，故障依旧。     

F99-Ⅰ型X线机常见故障分析与检修

本文作者就F99-Ⅰ型X线机常见的几种故障与检修 ,进行分析。1　毫安 (mA)表故障的检修1 1　故障现象开机后透视正常。拍片时继电器工作程序正常 ,但mA表无指示。1 2　故障分析透视正常 ,说明高压电路正常 ;工作程序正常 ,说明控制电路正常 ;曝光无mA显示应重点检修 3个部分 :①灯丝加热状况 ;②高压 ;③mA表以及连接电路。1 3　故障检修①断开高压初级JX4～ 6 ,JX4～ 8、开机再曝光 ,测量高压初级电压 ;②选 10 0mA、5 0kV时 ,初级电压为 15 6V ,排除初级电路故障 ;③将球管窗口打开 ,开机观察灯丝加热状况 :对应不同mA挡 ,大小焦点切…     

STKS血球仪无法启动维修1例

故障现象电源报警9V、20V等报警,且伴蜂鸣,显示屏不亮,MPU板的SW灯不亮. 维修过程 1、发现F6保险丝烧断,更换后仍旧烧. 2、检查CR1～CR6,发现CR6桥堆的一个臂短路.更换之. 3、开机,电源的报警已经消失,各路电源已经有输出.但仪器仍然长鸣,显示屏不亮,MPU板的SW灯不亮.     

X线机旋转阳极保护电路故障

1故障现象开机后,选择透视工作正常。选择普通摄影、滤线器摄影时,曝光指示灯不亮,MA表无指示,没有X线发生。2故障原因由于透视正常,无X线发生的原因可在以下3种电路中:摄影控制电路;旋转阳极启动及保护电路;摄影限时电路。3故障检修关机后,把高压初级JX2-7、JX2-8接线端断开,摄影条件调至最低进行曝光,观察各继电器工作情况及X线管旋转阳极运转情况。开机后,按下AN10,JC8得电工作,常开触点(17、18)闭合,使JC5得电工作自锁,X线管灯丝增温。同时JC6得电,X线管阳极启动运转正常,经1s～2s后,J4工作,触点闭合,电路完成摄影预备工作。松…     

X线机球管故障分析与改进

本院一台透视用 X线机,是由西门子诊视床和万东 F99控制台组装而成。机器使用已有多年。近日,由于大批量的做体检,机器连续出现故障。 故障现象连续出现 RD2保险丝断,每次更换后,都能使用几天,最后一次, RD1、 RD2、 RD3保险丝一起断,其中 RD1、 RD2保险座被炸裂,说明电路中存在严重短路。毫安表满偏。用手摸球管套,发现过热。 分析与检修严重短路可能存在下列故障： (1)控制台出现短路。 (2)高压发生器存在短路。 (3)电缆出现短路。 (4)球管真空度不良。     

柯达M35型洗片机故障检修2例

故障现象1正常工作时,突然整机断电不工作. 故障检修打开外壳,开机,发现进片电机冒烟.将进片电机拆下后通电试机,整机依然不通电.通过对电路图的分析发现,电源的火线通过电源开关后在1号线与8号线之间有4A过流保护器.用万用表测量过流保护器与电机后,判断故障原因为:     

XTV-ZHD54系列X线医用电视系统常见故障分析

<正>XTV-ZHD54系列X线医用电视系统在基层医院装备较多,其常见故障及判断方法如下:1故障判断方法1.1直观检查打开机盖,观察有无接线断开、脱焊、短路、元器件相碰、电阻电容有无烧焦、烧爆痕迹,接插件有无松动。开机观察有无打火、冒烟等。     

PKB/Akt 调节结构域的克隆,表达及初步纯化

目的: 克隆akt1的调节结构域 (regulation domain RD )的编码基因,表达并纯化 Akt RD蛋白,为研究 RD的功能奠定基础.方法: 用RT-PCR方法从胚胎肝细胞中获得Akt1调节结构域RD的编码基因,克隆至pMD18-T载体并测序,结果正确后亚克隆到含有6个His的融合表达载体pRSET-A中,转化大肠杆菌BL21(DE3),经IPTG诱导表达RD/6×His融合蛋白,超声裂菌,将上清通过金属螯合层析进行纯化.结果: 从人胚胎肝细胞中扩增出编码RD的cDNA,序列测定证实与文献报道的序列一致;成功构建了6×His融合的表达载体pRSET-A -RD;表达了RD/6×His融合蛋白,并纯化得到了RD/6×His蛋白. 结论: 成功克隆了人akt1的调节结构域RD基因,构建了6×His融合的表达载体,表达了RD/6×His融合蛋白并得到了纯化的RD/6×His蛋白.     

kD- 400型 X线机 mA值增大故障分析检修

故障现象 kD400型 400mA X线机,用 75kV、 2.5mA做透视时, X线突然中断,荧光屏无荧光产生,重新开机后再行透视曝光时,发现过载指示灯燃亮,透视 mA表指针有指示,并且上升至 5mA,但是荧光屏无荧光,无 X线产生.     

F78-ⅢB型300mA X线机罕见故障1例

1 故障现象 开机后,控制台内有时出现"吱吱"声,有时则Ⅱ台球管不能曝光.如能曝光,控制台及高压发生器均发出严重的"嗡嗡"声,有时RD L1保险丝烧断,电压表显示电压下降,胶片感光量有所增加,但毫安表显示无异常.     

Value of D-Dimers in patients with acute aortic dissection

Objective: To evaluatel the value of D-dimers in patients with acute aortic dissection (AAD). Methods: This study consisted of 16 patients with AAD and 27 non-AAD patients. Serum D-dimets were measured by Sta-Liatest D-DI immunoturbidimetric assay. Results: D-dimer level was higher (P ＜ 0.001) in patients with AAD(7.91 ± 5.52 μg/ml) than that in non- AAD group(1.57±1.24 μg/ml). D-dimer was positive (＞0.4 μg/ml) in all patients with AAD and in 10 control group patients (37%). Among patients with acute AAD, D-dimers tended to be higher in Stanford A than in Stanford B (8.67 ± 4.31 μg/ml vs. 3.24±1.27 μg/ml, P ＜0.01). D-dimer values tended to be higher in more extended disease(3.84 ± 1.65 μg/ml, 8.57 ± 3.58 μg/ml and 11.87 ± 5.69 μg/ml in thoracic aorta, thoracic and abdominal aorta, thoracic and abdominal aorta and iliacal arteries, respectively, P ＜ 0.05 for both 8.57 ± 3.58 and 11.87 ± 5.69 vs. 3.84 ± 1.65 ). Including the control group into the analysis, we found a sensitivity of 100%, a negative predictive value of 100%, and a specificity of 66% and a positive predictive value of 64% for D-dimer in diagnosis of AAD in our patients with suspected AAD. Conclusion: D-dimer was elevated in patients with AAD. A negative D-dimer test result could be useful in excluding AAD.     

Research of combined liver-kidney transplantation model in rats

Objective： To set up a simple and reliable rat model of combined liver-kidney transplantation. Methods： SD rats served as both donors and recipients. 4℃ sodium lactate Ringer＇s was infused from portal veins to donated livers,and from abdominal aorta to donated kidneys, respectively. Anastomosis of the portal vein and the inferior vena cava （IVC） inferior to the right kidney between the graft and the recipient was performed by a double cuff method, then the superior hepatic vena cava with suture. A patch of donated renal artery was anastomosed to the recipient abdominal aorta. The urethra and bile duct were reconstructed with a simple inside bracket. Results： Among 65 cases of combined liver-kidney transplantation, the success rate in the late 40 cases was 77.5%. The function of the grafted liver and kidney remained normal. Conclusion： This rat model of combined liver-kidney transplantation can be established in common laboratory conditions with high success rate and meet the needs of renal transplantation experiment.     

BLOOD PRESSURE CHANGE WITH AGE IN SALT-SENSITIVE TEENAGERS

Objective To observe blood pressure change with age in salt-sensitive teenagers whose salt sensitivity were determined by repeated testing.Methods Salt sensitivity was determined through intravenous infusion of normal saline combined with volume-depletion by oral diuretic furosemide in 55 teenagers. After five years, salt sensitivity was re-examined and subject blood pressure was followed up. Blood pressure changes in salt-sensitive teenagers were compared to that of non-salt sensitive teenagers over five years.Results After 5 years, the repetition rate of salt sensitivity determined by intravenous saline loading is 92.7%. In teenagers with salt sensitivity on the baseline, both the systolic blood pressure increments and increment rates were much higher than non-salt sensitive teenagers (12.7±12.1 mmHg vs. 2.8±5.2 mmHg, P＜ 0.01; 12.2%± 12.0% vs. 2.5% ±4.4%, P＜ 0.001,respectively). There was a similar trend for diastolic blood pressure (8.4 ± 6.4 mmHg vs. 3.7 ± 6.4 mmHg, P = 0.052; 13.2% ±10.6 % vs. 6.8%± 10.1%, P = 0.053, respectively).Conclusions Salt sensitivity determined by intravenous saline loading showed good reproducibility. Blood pressure increments with age were much higher in salt-sensitive teenagers than non-salt sensitive teenagers, especially in terms of systolic blood pressure.     

安心颗粒对急诊经皮冠状动脉介入术后生活质量影响的研究

目的：评价使用安心颗粒对急诊经皮冠状动脉介入术（PPCI）术后生活质量的影响.方法：将160例接受PPCI的急性ST段抬高型心肌梗死患者随机分为安心颗粒组（术前顿服安心颗粒8.8g,术后安心颗粒4.4 g/次,每日2次）和对照组（仅接受基础药物治疗）.所有患者均服用阿司匹林、氯吡格雷和阿托伐他汀.分别在入院时、出院前1d、出院后180 d时,应用心肌梗死多维度量表（MIDAS）、中文版SF-36评价量表对患者生活质量评分.并观察术后30 d以内的出血并发症、血小板减少症发生情况.结果：入院时和出院前1d,两组患者的心肌梗死MIDAS、SF-36量表评分比较无差异（P＞0.05）;出院后180 d时,与对照组比较,安心颗粒组MIDAS、SF-36评分明显减低（P＜0.05）;组内与入院时比较,两组出院前1d、出院后180 d时,MIDAS、SF-36评分均降低（P＜0.05）.两组患者在随访期间均无大量出血、少量出血、重度和极重度血小板减少症发生,安心颗粒组有4例、对照组有7例发生不明显出血（P＞0.05）.两组发生轻度血小板减少症的患者数比较无差异（P＞0.05）.结论：PPCI使用安心颗粒,能改善急性ST段抬高型心肌梗死患者的生活质量,且不增加出血风险.     

The comparative studies of the influences of Urapidil and Nicardipine on sino-atrial node function, atrio-ventricular node function and hemodynamics

Objective:To investigate the influences of urapidil and nicardipine on rabbit sinus function,atrio-ventricular node function and hemodynamics.Methods:Thirty-two Angora's rabbits were selected and randomly divided into four groups.U1 group:urapidil 0.25 mg/kg;U2 group:urapidil 0.5 mg/kg;N1 group:nicardipine 10 μg/kg;N2 group:nicardipine 20 μg/kg.All these medicine were administrated within 30 seconds.Measurements were taken before and after the administration of urapidil or nicardipine for the following data:mean blood pressure(MAP),heart rate(HR),sino-atrial conduction time(SACT),maximal sinoatrial recovery time(SNRTmax)corrected sinus node recovery time(CSNRT),index of sinus node recovery time(SNRTI),Wenckebach A-V conduction frequency (WB),and P-R interval.Results:Significant MAP and HR changes were identified in all of the four groups before and after administration of both urapidil and nicardipine.No significant changes could be found in the rest of the parameters.Intergroup analysis showed that SACT and CSNRT of N1 and N2 groups were shorter than those of the U2 group(P＜0.01);the MAP decreased(P＜0.01)and the HR increased drastically(P＜0.01).Conclusions:Neither urapidil(0.25 mg/kg,0.5 mg/kg)nor nicardipine(10μg/kg,20μg/kg)has any significant influence on rabbit sinus function or rabbit atrio-ventricular node function.Nicardipine could be a better choice than urapidil for parafunctional sinus node patients.     

Expression of OPGmRNA and ODFmRNA in the patients of hip fracture due to osteoporosis

Objective：To investigate the gene expression of osteoprotegerin（OPG） and osteoclast differentiation factor（ODF） in the bone tissue of patients with hip fracture due to osteoporosis. Methods：OPGmRNA and ODFmRNA in the bone tissue in 50 cases of osteoporosis sufferers（over 50 years old） with hip fracture（Observer Group） and 30 cases of hip facture sufferers with no osteoporosis（Control group） were analyzed with the Semi-Quantitative RT-PCR method. Results：The mRNA expressed of ODF, OPG were both high in the patients with hip fracture. In the control group, the expression of OPG mRNA was observed, while the expression of ODF mRNA was very slight. Conclusion：Aged patients contained all signals including OPG, ODF that are essential for inducing osteoclastogenesis and promoting bone resorption.     

The clinicopathological and immuohistochemical analysis of solid-pseudopapillary tumor of the pancreas： report of 9 cases

Objective：To investigate the clinical features, pathological characteristics and immunophenotype of solid-pseudopapillary tumor of the pancreas（SPTP）. Methods：Nine surgically treated cases of SPTP were retrospectively reviewed. Hematoxylin and Eosin（HE） staining and immunohistochemical staining were used to analyze all cases, and the general clinical data was collected. Results：Six patients were asymptomatic except for a palpable mass. Two patients complained of vague-epigastric pain. One patient appeared jaundice. The tumor was encapsulated and solid tissues alternately with cystic tissues. Histologically, the histological structure of solid portion was pseudopapillary with a fibrovascular core. Tumor cells were uniform and medium-sized which were arranged in sheets ets or nests or pseudopapillary patterns. Immunohistochemical studies demonstrated that SPTP proved positive in vimentin（9/9 cases）, AAT（9/9 cases）, NSE（9/9 cases）, ACT（7/9 cases）, CK20（2/9 cases）, CgA（1/9 cases）, S-100（3/gcases）, PR（4/gcases）, Syn（3/9 cases） and CD56（5/9cases）, negative in CEA and ER. Conclusion：SPTP is a tumor predominantly occurring in young women frequently without special symptoms. This tumor has various characteristical histological patterns with different immunophenotype.     

Dynamic Changes in Serum Estradiol and Progesterone levels in Patients of Premenstrual Syndrome with Adverse Flow of Liver-qi

Objective:To probe into the influence of changes of ovarian hormones on the pathogenesis of the specific sub-type premenstrual syndrome(PMS)and reveal partial microcosmic mechanisms of adverse flow of liver-qi.Methods:Estradiol(E2)and progesterone(P)levels in serum were determined at different phases of menstrual cycle by radioimmunoassay.Results:In the group of PMS with adverse flow of liver-qi.the secretive peak value Of E2 and P at the follicular phase significantly decreased,and the secretive peak value at the luteal phase did not come into being.Conclusions:Low E2 and P secretive peak at the follicular phase and absence of secretive peak at the luteal phase is one of the microcosmic mechanisms of PMS with adverse flow of liver-qi.One of the pathophysiologic mechanisms of specific sub-type PMS is probably the continuous low level of E2and P.     

Real-time Three-dimensional Echocardiography in Assessment of Left Ventricular and Right Ventricular Volumes

Real-time three-dimensional echocardiography (RT3DE)is a new ultrasound technique that enables dynamic threedimensional visualization and quantification of the heart in real time. Investigation of feasibility and methodology of RT3DE in determining left ventricular (LV) and right ventricular (RV) volumes, RT3DE was performed in 35 normal adults using Philips SONOS 7500 system with a 2-4 MHz matrix array transducer. The 60°×60° "pyramid" volume database was obtained and analyzed on a TomTec echo workstation. Both LV and RV volumes were calculated with four 3DE methods (i.e. apical 2, 4, 8, and 16-plane) through manually tracing ventricular endocardial borders in end diastole and end systole. Stroke volumes were then calculated. LV volume was also measured by 2DE Simpson's rule using GE VIVID 7 ultrasound machine.     

SCREENING FOR A 21-CHROMOSOME ABNORMALITY IN PREIMPLANTED EMBRYOS OF ELDERLY WOMEN

Increasing maternal age is the only etiological factor unequivocally linked to Down's syndrome in humans. The occurrence rate of newborns with Down's syndrome is about 1/220 in women over 35 years old. However, the occurrence rate in embryos fertilized in vitro, of the elder woman is unclear. Using FISH we screened the number of chromosome 21 in preimplanted embryos of 5 elderly women (average age, 38.4 years) to study the feasibility and necessity of screening trisomy 21 in embryos in patients over 35 years old at the in vitro fertilization (IVF) center.