Healing time of incision infection after hepatobiliary surgery treated by needle-free incision suture closure

AIM: To compare the effectiveness of needle-free incision suture closure with butterfly tape and traditional secondary suturing techniques in treating incision infection. METHODS: Two hundred and twenty-three patients with incision infection following hepatobiliary surgery at a tertiary hospital were randomly divided into three groups: 90 patients were closed by needle-free incision suture closure, which gradually closed the incision wound when drainage from incision infection was visibly decreased and healthy granulation tissues had grown; 79 patients were closed by butterfly bandage; another 54 patients were closed by traditional secondary suturing technique. Healing time of incision infection was calculated from the beginning of dressing change to the healing of the incision. RESULTS: Healing time in the needle-free incision suture closure group (24.2 +/- 7.2 d) was significantly shorter than that in the butterfly bandage group (33.3 +/- 11.2 d) and the traditional secondary suturing group (36.2 +/- 15.3 d) (P < 0.05). Healing time in the butterfly bandage group appeared to be slightly shorter than that in the secondary suture group, but the difference was not statistically significant (P > 0.05). CONCLUSION: Needle-free incision suture closure could gradually close the infection wound at the same time of drainage and dressing change, thereby shortening the healing time. (C) 2014 Baishideng Publishing Group Inc. All rights reserved.

Comparison on Determination Results of Methane and Total Hydrocarbons by Glass Syringe Method and Air Bag Method

Samples at different setting time were determined by glass syringe method and air bag method, and their results were analyzed. The results showed that concentrations of methane and total hydrocarbons obviously declined with the prolonging of setting time by glass syringe method, and recovery rate of sample declined to 60% after 8 h. In air bag method, analysis results of methane and total hydrocarbons were stabler, and recovery rate of sample was 93% after 8 h.

A Modified Branched Graft Inversion Technique Employing a Syringe Inserter in Ascending Aortic Replacement for Type A Aortic Dissection

Purpose: To achieve good outcomes during aortic surgery with circulatory arrest, a secure and non-bleeding anastomosis must be achieved rapidly to ensure brain protection. We report our initial experiences with a modified Branched Graft Inverting (BGI) technique using an inserter under mild hypothermia. We aimed to reduce the surgical duration and to prevent unnecessary damage to the fragile aorta. Methods: We retrospectively reviewed patients with type A acute aortic dissection (AAD) who underwent distal anastomosis via the modified BGI technique using an inserter between January 2012 and March 2013. Open distal anastomosis was performed under mild hypothermia with right hemisphere perfusion from the right axillary artery. Results: Eight patients were enrolled. There was no mortality. Circulatory arrest time was reproducibly 20.3 ± 1.9 min, which was sufficient to complete non-bleeding distal anastomoses. The average rectal temperature during circulatory arrest was 26.5℃ ± 1.9℃. All patients were extubated the day after the operation without any neurological deficit. Conclusion: The modified BGI technique employing an inserter and mild hypothermia offered easy, secure, and reproducible distal anastomosis for ascending aortic replacement for type A acute aortic dissection. Our outcomes were favorable and support further development of this technique.

Does carrier fluid reduce low flow drug infusion error from syringe size?

BACKGROUND Critically ill neonates and pediatric patients commonly require multiple low flow infusions.Volume limitations are imposed by small body habitus and comorbidities like cardiopulmonary disease,renal failure,or fluid overload.Vascular access is limited by diminutive veins.Maintenance fluids or parenteral nutrition in conjunction with actively titrated infusions such as insulin,fentanyl,prostaglandins,inotropes and vasopressors may necessitate simultaneous infusions using a single lumen to maintain vascular catheter patency.This requirement for multiple titratable infusions requires concentrated medications at low flows,rather than more dilute drugs at higher flows that in combination may volume overload small infants.AIM To determine whether carrier fluid reduces variability that variability of low flow drug infusions is proportional to syringe size in pediatric critical care.METHODS We assessed concentrations of orange“drug”in a 0.2 mL/h low flow clinical model with blue dyed carrier fluid at 5 mL/h,using 3-,10-,or 60-mL syringes.A graduated volumetric pipette was used to measure total flow.Mean time to target concentration was 30,21,and 46 min in 3-,10-,and 60-mL syringes,respectively(P=0.42).After achieving target concentration,more dilute drug was delivered by 60-mL(P<0.001)and 10-mL syringes(P=0.04)compared to 3-mL syringes.Drug overdoses were observed during the initial 45 min of infusion in 10-and 60-mL syringes.Total volumes infused after target concentration were less in the 60-mL condition compared to 3-mL(P<0.01)and 10-mL(P<0.001)syringes.RESULTS Linear mixed effects models demonstrated lesser delivered drug concentrations in the initial 30 min by 3-mL compared to 10-and 60-mL syringes(P=0.005 and P<0.001,respectively)but greater drug concentrations and total infused drug in the subsequent 30-60 and 60-90 min intervals with the 3-and 10-mL compared to 60-mL syringes.CONCLUSION With carrier fluid,larger syringes were associated with significantly less drug delivery,less total volume delivered,and other flow problems in our low flow drug model.Carrier fluid should not be used to compensate for inappropriately large syringes in critical low flow drug infusions.

Syringic acid improves oxidative stress and mitochondrial biogenesis in the liver of streptozotocin-induced diabetic rats

Objective:To determine the effects of syringic acid on hepatic damage in diabetic rats.Methods:Diabetes was induced by streptozotocin.Diabetic rats were given syringic acid at doses of 25,50 and 100 mg/kg by oral gavage for 6 weeks.Syringic acid effects on the liver were evaluated by examination of plasma biochemical parameters,and pathological study.In addition,biomarkers of lipid peroxidation and antioxidant status of liver tissues were assessed.Real time-PCR was performed to investigate the m RNA expression levels of mitochondrial biogenesis indices in different groups.Results:Syringic acid significantly attenuated the increase in most of plasma biochemical parameters in diabetic rats.Moreover,syringic acid treatment increased the catalase activity while it reduced the superoxide dismutase activity and hepatic malondialdehyde level in diabetic rats.There was no difference between the glutathione content of the treated and untreated groups.These findings were supported by alleviation of histopathological damages in the syringic acid-treated groups compared to the untreated diabetic group.Syringic acid also significantly upregulated the hepatic m RNA expression of PGC-1α,NRF-1,and NRF-2 and increased the mtD NA/nD NA ratio in diabetic rats.Conclusions:Syringic acid can be considered as a suitable candidate against hepatic complications since it can reduce oxidative damages in diabetic cases.Furthermore,it has the potential of targeting hepatic mitochondria in diabetes.

Anti-Endotoxic Effects of Syringic Acid of Radix Isatidis

The anti-endotoxic effect of syringic acid (SA) isolated from Radix Isatidis (Banlangen, BLG) was studied. SA was extracted and isolated from BLG and diluted into 1 % solution. The content of SA-pretreated endotoxin (ET) was quantitatively determined using Limulus test. The ability of fever induction of ET pretreated with SA was measured using endotoxin-induced fever test in rabbits. The LPS-induced death in mice pretreated with and without SA was compared. Results showed that after pretreatment with SA, 83. 16 % of ET was destroyed, the ET-induced fever in rabbits relieved markedly and the LPS-induced death rate in mice dropped from 68 % to 20 %. It was concluded that SA isolated from BLG had anti-endotoxic effects.

Syringic acid induces cancer cell death in the presence of Cu(Ⅱ)ions via pro-oxidant activity

Objective:To investigate the effects of syringic acid on HEK 293 and HepG2 cells in the absence and presence of exogenous Cu(Ⅱ)and Fe(Ⅱ)ions.Methods:The antiproliferative effects of syringic acid on HEK 293 and HepG2 cells in the absence and presence of exogenous Cu(Ⅱ)and Fe(Ⅱ)ions were examined by MTT assay.Additionally,colony-forming,reactive oxidative species(ROS)generation,apoptosis induction,autophagy,mitochondrial membrane potential,and mitochondrial mass were investigated.Results:At 24 and 72 h,no significant differences were observed in the viability of HepG2 cells between the control and syringic acid+Fe(Ⅱ)groups.However,exposure of HepG2 cells to syringic acid+Cu(Ⅱ)for 72 h reduced the cell viability significantly.Furthermore,ROS formation,induction of apoptosis,and autophagic vacuoles were significantly increased in HepG2 cells without marked changes in mitochondrial membrane potential and mitochondrial mass.Moreover,syringic acid+Cu(Ⅱ)reduced the plating efficiency and surviving fraction significantly.Conclusions:The combination of syringic acid with Cu(Ⅱ)was toxic to cancer cells and showed pro-oxidant activity.In addition,this combination induced autophagy in cancer cells with less cytotoxic effects on normal cells,which is a potential candidate for the development of novel therapeutics towards cancer.

丁香酸调控胆汁酸代谢和肠道屏障改善胆汁淤积肝病的研究

目的基于胆汁酸代谢和肠道屏障探讨丁香酸对胆汁淤积小鼠的调控作用。方法20只小鼠随机分为对照组、模型组和丁香酸低、高剂量(70、140 mg·kg^(-1))组。连续7 d灌胃给予相应药物,于第5天给药2 h后腹腔注射α-萘异硫氰酸酯(ANIT)诱导肝内胆汁淤积小鼠模型。末次给药后,记录小鼠体质量及肝质量变化;检测小鼠血清中肝功能指标、组织病理学变化,qPCR验证小鼠结肠组织中紧密连接蛋白闭锁小带蛋白-1(ZO-1)、闭合蛋白(Occludin)、紧密连接蛋白-5(Claudin-5)mRNA的表达,采用非靶向代谢组学分析血清中代谢产物的变化,检测肝脏和粪便中总胆汁酸变化。结果丁香酸可以显著降低模型组小鼠血清中丙氨酸氨基转移酶(ALT)、天冬氨酸氨基转移酶(AST)、碱性磷酸酶(ALP)活性和总胆红素(TBIL)、直接胆红素(DBIL)水平(P<0.05,P<0.01),减轻肝脏损伤和坏死;降低模型组小鼠结肠的淋巴细胞浸润,恢复隐窝形态。丁香酸高剂量组能显著升高结肠中ZO-1、Occludin、Claudin-5的mRNA表达水平(P<0.05);显著上调11个代谢物,下调29个代谢物,代谢产物主要涉及次生代谢物的生物合成、次级胆汁酸生物合成和胆汁分泌通路。丁香酸降低肝脏中总胆汁酸含量及增加粪便总胆汁酸的排出(P<0.05,P<0.01)。结论丁香酸可以显著改善胆汁淤积小鼠肠道屏障的受损,并且促进胆汁酸的代谢,这可能是丁香酸改善胆汁淤积的关键调控环节。

应用光谱指数和机器学习反演紫丁香叶片的叶绿素面密度

为无损监测植物叶片叶绿素面密度,及时反映植物的生长状态,以内蒙古农业大学东校区紫丁香(Syringa oblata Lindl.)为研究对象,获取了160枚叶片反射率光谱(350~2500 nm)及其对应的叶绿素面密度数据,在一维和二维光谱指数的基础上引入三维光谱指数(I_(TBI)),基于原始光谱(R)、一阶微分光谱(R_(FD))和二阶微分光谱(R_(SD))构建了全波段不同维度光谱指数,经皮尔逊相关系数法(PCC)筛选出最优光谱指数,构建了海洋捕食者算法优化孪生支持向量机融合模型(MPA-TSVR),并与孪生支持向量回归机(TSVR)、偏最小二乘回归法(PLSR)、反向传播神经网络(BPNN)和支持向量回归机(SVR)模型对比分析。结果表明:不同维度下最优光谱指数与叶绿素面密度间的最大相关系数分别是I_(TBI3)(R_(SD714),R_(SD745),R_(SD700))为0.9015、I_(SRI)(R_(FD704),R_(FD738))为0.8911和R_(FD744)为0.8740。不同预处理下最优光谱指数建模精度由高到低顺序为:R_(SD)、R_(FD)、R,R_(SD)-MPA-TSVR反演效果最佳,测试集决定系数(R^(2))为0.9060,均方根误差(R_(MSE))为3.8827;不同维度下最优光谱指数建模精度由高到低顺序为:三维光谱指数、二维光谱指数、一维光谱指数,I_(TBI3)-MPA-TSVR反演效果最佳,测试集R^(2)为0.9110,R_(MSE)为3.7763,相比于I_(TBI3)-TSVR、I_(TBI3)-PLSR、I_(TBI3)-BPNN和I_(TBI3)-SVR模型更稳定。因此,I_(TBI3)-MPA-TSVR模型可为无损监测紫丁香的生长状态提供参考。

基于语义学的儿童胰岛素注射器设计研究

产品语义学是一种将产品设计思维通过语义转化出具象的功能,操作以及象征含义的设计方法。文章对于产品语义学的设计理念、意义进行了阐述。概述了糖尿病的发展,针对儿童群体的特点进行总结归纳,分析了儿童胰岛素注射器的特点。通过产品语义视角,具体应用到儿童医疗设计之中,并聚焦于注射器的形态、功能、结构、材料,进行了具体分析与研究。选取航天意象为设计语义与胰岛素注射器进行设计结合,对火箭形态进行语义整合,强化儿童在使用产品时的任务感、使命感。将产品形态、文化语义有机结合,为现有的儿童胰岛素注射器设计提供了新思路。

基于激光诱导击穿光谱技术的水中氮元素检测

利用气溶胶辅助激光诱导击穿光谱(LIBS)技术实现了对水中富营养化元素氮的实时在线准确快速检测。针对传统的同心雾化器对液体的进样量受液体物理性质限制的缺陷,本文采用微量注射泵辅助进样实现不同盐度待测样的相同进样量。结果表明,采用微量注射泵,N I 746.831 nm绝对光谱强度的平均相对标准偏差D_(RSAV)由19.51%改善至6.78%,定量分析检测极限LoD由5.45改善至1.57 mg/L,预测浓度与制备浓度的线性决定系数R^(2)、平均相对误差E_(R)和交叉验证均方根误差E_(RMSCV)分别由0.2830、45.80%和23.96mg/L改善至0.9043、10.33%和4.28 mg/L。本研究的结果表明微量注射泵辅助进样可实现气溶胶辅助LIBS技术对水中氮元素的精准灵敏检测。

丁香酸多孔淀粉酯的制备与表征

以马铃薯多孔淀粉(porous starch,PS)为材料,制备具有较好溶解性和抗氧化性的丁香酸多孔淀粉酯(syringic acid porous starch ester,SA@PS)。实验通过N 2-吸/脱附、扫描电镜、傅里叶变换红外光谱、液态核磁等方法,研究了SA@PS的特性。结果表明,以PS(比表面积14.69 m^(2)/g)为主体,可制备取代度为0.06~0.25的SA@PS;傅里叶变换红外光谱和液体核磁共振氢谱证明SA和PS之间形成了酯键;X射线衍射表明酯化反应改变了淀粉的结晶类型;SA@PS具备较强的抗氧化活性,可用于光、氧化或高温敏感分子的保护材料。

丁香酸对不同品种烟草苗期根系生长的影响

为探究最新发现的植物源生物硝化抑制剂丁香酸对烟草品种K326和云烟85苗期根系生长的影响,通过基质培养试验,设置0、10、25、50、100、200 μmol/L 6个丁香酸浓度,研究了不同浓度丁香酸在不同时间(3 d和5 d)对K326和云烟85主根伸长量和一级侧根发育的影响。结果表明:与对照(0 μmol/L)相比,25~100 μmol/L丁香酸能促进K326主根伸长,在3 d时促进率为13.33%~30.67%,在5 d时促进率降为8.54%~22.55%,最适浓度为50 μmol/L;10~50 μmol/L丁香酸促进云烟85主根伸长,在3 d时促进率为7.81%~18.75%,在5 d时促进率维持在4.10%~10.66%,最佳促进浓度25 μmol/L;丁香酸对两个烟草品种主根伸长的促进效果均为3 d优于5 d。在侧根发育方面,低浓度丁香酸能显著促进K326和云烟85一级侧根数,两个品种促进侧根发育的最适浓度均为25 μmol/L。相关性分析表明,丁香酸处理下两个烟草品种苗期的主根伸长变化率与侧根数变化率呈显著正相关。可见,适宜浓度的丁香酸对两个典型烟草品种苗期主根增长和侧根发育均为促进效应。生物硝化抑制剂丁香酸具有促进烟草根系生长的潜力,为研发烤烟新型专用肥提供了理论依据。

一种应用于肺小结节术前定位的双腔同步注射器的设计

目的设计一种可用于肺小结节术前定位的双腔同步注射器。方法双腔同步注射器由注射器内腔、注射器外腔以及双腔穿刺针组成,注射器内、外腔的推柄设计为环状卡槽状,双腔针体可分别连接注射器内、外腔,外针头前端设计有环状滤网。结果注射器内、外腔推柄的环状卡槽设计可同时推注两种液体,双腔针体可分别导流两种液体,外针头前端的环状滤网设计,增加了液体的接触面积,使得磁流体和葡萄糖酸钙离开针头后立即充分接触,迅速形成磁凝胶。结论成功设计出一种可同时推注两种液体的双腔同步注射器,适用于磁凝胶进行肺小结节的术前定位。

Pulsed lavage in joint arthroplasty: A systematic review and metaanalysis

BACKGROUND Knee and hip osteoarthritis affects millions of people around the world and is expected to rise even more in frequency as the population ages.Joint arthroplasty is the surgical management of choice in these articulations.Heterotopic ossi-fication and radiolucent lines formation are two frequent problems faced in hip and knee replacements respectively.Some studies show that the usage of pulsed lavage may prevent their formation.AIM To compare pulsed lavage to standard lavage in joint arthroplasty.METHODS PubMed,Cochrane,and Google Scholar(page 1-20)were searched till December 2023.Only comparative studies were included.The clinical outcomes evaluated were the heterotopic ossification formation in hip replacements,radiolucent lines formation,and functional knee scores in knee replacements.RESULTS Four studies met the inclusion criteria and were included in this meta-analysis.Pulsed lavage was shown to reduce the formation of radiolucent lines(P=0.001).However,no difference was seen in the remaining outcomes CONCLUSION Pulsed lavage reduced the formation of radiolucent lines in knee replacements.No difference was seen in the remaining outcomes.Furthermore,the clinical significance of these radiolucent lines is poorly understood.Better conducted randomized controlled studies and cost-effectivity studies are needed to reinforce these findings.

核酸提取仪用多轨道注射泵设计与研究

适用于核酸提取仪的多轨道注射泵是一种新型注射泵,可以将少量药液通过单轨道或多轨道等多种注射方式准确、均匀、连续地泵入体内。文章根据多轨道注射泵的特点设计了一款适用于核酸提取仪的多轨道注射泵。在分析多轨道注射泵工作原理的基础上,设计了多轨道注射泵电机、泵体和柱塞泵等关键部件,并对多轨道注射泵进行了相应的传动受力分析计算,从而验证了设计的可行性。

基于多指标分析的主流微量注射泵评价研究

目的建立科学的微量注射泵评价指标体系并开展评价,为医护人员选择优质产品提供依据,为产品改进优化提供建设性意见,为患者提供更精准、更有保障的医疗服务。方法通过专家小组讨论确定流量相对示值误差、流量示值重复性、输出精度、阻塞压力报警相对示值误差、接地电阻、识别注射器容量完备程度、显示界面可用性、电池满电量工作时长、内部结构稳定性和操作便捷性10个参数作为微量注射泵的评价指标体系,采用主客观赋权法对各指标权重进行赋值,建立品牌A~D微量注射泵对应的决策方案集与决策矩阵,并构造评价目标模型对各品牌微量注射泵进行综合评价与优劣排序。结果在以上10个主要指标的综合对比评价下,各品牌微量注射泵的评价目标值矩阵d_(i)=(0.32,0.84,0.57,0.56),即产品优劣排序为品牌B>品牌C>品牌D>品牌A。结论本研究建立的微量注射泵评价指标体系与评价方法具有一定的适用性,有助于医疗机构选购最合适的产品,同时为医疗器械评价指标体系的建立与评价方法研究提供了思路。

离心式供料盘装置的仿真研究

为提高预充式注射器的推杆装置上料效率,课题组基于EDEM软件的JKR模型进行仿真分析,以推杆为研究对象,以规定时间段内出料数为评价指标,探究了内转盘转速、外转盘转速、内转盘倾斜角、锥形盘角度和外转盘半径对推杆出料效率的影响。首先通过单因素分析,确定了各单因素的影响程度,筛选出影响程度更大的4个因素,再设计进行4因素3水平正交试验,确定了最佳参数组合及各因素对出料效率的影响程度顺序;然后,对出料稳定性进行了研究,得到了最佳进料方式;最后进行了试验验证。结果表明:仿真和试验的最大误差为9.6%,说明该模型的模拟分析是可靠的;最佳参数组合情况下,比原始数据出料效率提升了29.8%。

一种新型胃液回收及存储装置的设计与应用

肠内营养是重症患者营养支持的首选方法,胃残余量监测能够很好的评估胃肠动力和肠内营养的耐受情况,也是识别高误吸风险最常用的指标。目前注射器回抽法是临床监测胃残余量最常用的方法。本研究介绍了一款实用新型胃液回收及存储装置的设计和使用方法,旨在有效降低二次污染的发生风险,同时减轻医护人员的工作负担,提高工作效率。