医用设备对心脏起搏器的干扰

<正>起搏器在进行正常按需起搏的同时,往往还受到各种非心源性电磁信号的干扰,引起起搏器暂时或永久性不正常工作.在外界干扰中,医用设备对心脏起搏器的干扰应引起足够的重视.能对心脏起搏器造成干扰的医用设备主要有高频电刀、除颤器、放射治疗设备、理疗设备等.下面就这几种医疗设备对起搏器产生干扰的情况及应采取的预防措施加以叙述.一、高频电刀高频电刀所输出的高频信号能直接穿过心脏起搏器的抗干扰电路,直接对起搏器造成损坏或干扰其功能.高频电流流经电极-心肌界面,可使电极局部心肌烧伤,造成传入阻滞,严重时诱发房颤和室颤.短暂使用电凝电刀可引起起搏器抑制,较长时间使用引起起搏器非同步工作.     

医用电子设备干扰与噪音的起因及解决方案

医疗仪器的干扰与噪音是许多操作人员和维修人员经常碰到的问题,它不仅影响仪器的正常工作,而且还往往误导医生作出错误的诊断.本文主要叙述了干扰与噪音的分类、引起的原因以及解决的办法.     

医用设备交流供电干扰及防护

使用交流电源供电的医用设备，存在着不容忽视的电源干扰问题，对此的子解和适当防护，是保证医用设备正常工作的必要技术手段。     

基于FPGA的干扰电流治疗仪的设计与仿真

应用DDFS原理,采用基于查找表(Look-Up-Table)结构的方法,建立起产生两路干扰电流的自动扫频模块和DDFS模块,设计了一种干扰电流治疗仪。各模块和整个系统的设计在FPGA的开发工具quartusⅡ中进行了仿真,结果表明该设计的原理正确,方案可行,具有应用前景。     

医用设备使用中的干扰分析及对策

医用设备使用中的干扰问题会影响到患者的诊断和治疗效果。通过对常见的干扰问题加以分析，并针对性地提出了解决方法。     

干扰电流促进骨折愈合的基理仪器设计与应用研究

介绍了利用中频干扰电流治疗骨伤的机理，在此基础上采用“动态”干扰电的方法，借助于单片机系统，研制出了微电脑骨伤电疗仪。该仪在波形的多样性以及操作的灵活可靠性方面都有了明显提高。临床应用60例，证明其对骨折的愈合、肿胀的消失、肌肉弹性的恢复均可产生良好的效果。     

医用设备温度补偿电路的设计

本设计采用输入端带有桥式电路的差动运放电路作为温度补偿电路，通过压差使仪器、计算机能够准确的测量和控制工作点温度。同时在软件上利用过采样技术提高温度测量的精度。     

论尖峰电压、电流对开关电源的干扰和抑制措施

开关电源具有体积小、重量轻、效率高等优点,在数字电路中应用广泛,但其高频开关会引起电压及电流的变化,这些变化会产生大量电磁干扰,影响电子设备正常运行。本文主要介绍了电源线干扰及抑制、尖峰电压及电流对开关电源的干扰及抑制措施。     

医用电气设备漏电流的产生原因

本文对医用电气设备漏电的产生原因提出理论依据,并进行具体分析。     

普美康IF干扰-刺激电流治疗仪报警故障的检修

普美康IF干扰-刺激电流治疗仪是近几年引进的用于肌肉、皮肤、神经等疾病的干扰电流、离子电渗治疗的仪器,型号为M150,与PRIMEDIC-SONO配合还可以进行超声波治疗。该机采用单片机控制,载波频率为4 000 Hz。该仪器不仅可以使用固定频率(即频谱)[1],还可进一步调出5种治疗     

临床中监护仪心电干扰的处理方法的探讨

目的:找出心电干扰的来源和解决方法。方法:通过对常见的干扰进行分析。结果:找到了心电干扰的来源及其解决方法。结论:心电干扰可以被很好的处理。     

128道体表电位抗工频干扰陷波滤波器的设计与实现

本文首先讨论一种用于消除体表电位工频干扰的数字陷波滤波器的设计，然后提出该滤波器的一种实现方法，通过微程序控制的专用简单处理机，可以时分复用处理１２８道信号。该滤波器具有信号保真度高，实时，结构简单，价格低廉等优点，能够较好地解决体表电位测量的抗工频干扰问题。     

嵌入式系统设计中干扰成因及解决方法

讨论了嵌入式微处理器系统开发中形成干扰的基本要素，并详细论述了解决干扰的基本措施。     

Decontamination of aquatic vegetable leaves by removing trace toxic metals during pickling process with acetic acid solution

The heavy-metal content of aquatic plants is mainly dependent upon their ecological system. This study indicated that although the toxic heavy-metal contents could be above the recommended maximum levels depending upon their concentrations in growing water, they can be decontaminated by pickling with 5% acetic acid solution. Almost all Cd, Hg, Ba, or Sb and 99.5% Pb, 96.7% Ag, or 97.1% Al were removed from Water Spinach leaves by soaking in acetic acid solution. For Water-Shield leaves, almost all Cd, Hg, Pb, Ba, or Sb and 95.0% Ag or 96.1% Al were removed. For Watercress leaves, almost all Cd, Hg, Ba, or Sb and 99.0% Pb or 99.7% Ag were removed. For Water Hyacinth leaves, almost all Cd, Ba, or Sb and 99.0% Hg, 98.5% Pb, 95.0% Ag, or 98.7% Al were removed.     

The Ultradent apparatus for removing dental calculus

New device for removal of dental calculus "Ultradent" is considered. Base functional units and their interaction are described. Technical specification of the device is reported. Serial production of the device was started from 1987.     

Relationship between upper limb motor function and activities of daily living after removing the influence of lower limb motor function in subacute patients with stroke: A cross-sectional study

BackgroundPrevious studies have reported a relationship between upper limb motor function and activities of daily living. However, their relationship after removing the influence of lower limb motor function has not been clarified.ObjectiveThis study aimed to investigate the relationship between Fugl-Meyer assessment upper limb and total Functional Independence Measure motor score and between Fugl-Meyer assessment upper limb and each item contained in Functional Independence Measure motor score after eliminating the influence of the motor function of the affected lower limb.MethodsThis retrospective cross-sectional study included 58 subacute stroke patients. To investigate the relationship between the Fugl-Meyer assessment upper limb and total Functional Independence Measure motor score before and after removing the influence of Fugl-Meyer assessment lower limb, Spearman’s rank correlation coefficient and partial correlation analysis were used. Additionally, the relationship between Fugl-Meyer assessment upper limb and each item of Functional Independence Measure motor score after removing the influence was assessed.ResultsBefore removing the influence of Fugl-Meyer assessment lower limb, Fugl-Meyer assessment upper limb was strongly correlated with total Functional Independence Measure motor score (r = 0.74, p < 0.001). However, it became weak after removing the influence (r = 0.27, p = 0.04). Regarding each item of Functional Independence Measure motor score, Fugl-Meyer assessment upper limb was correlated with grooming (r = 0.27, p = 0.04), bathing (r = 0.28, p = 0.03), dressing upper body (r = 0.33, p = 0.01), dressing lower body (r = 0.31, p = 0.02), and stair-climbing (r = 0.31, p = 0.02) after removing the influence.ConclusionThese findings suggest that the relationship between the upper limb motor function and activities of daily living is strongly influenced by lower limb motor function.     

医疗器械水垢去除影响因素研究

目的研究水垢性质、除水垢剂温度、浸泡时间因素对医疗器械水垢去除效果的影响。方法收集某院沉积有肉眼可见水垢的器械,分别按照水垢性质、不同除水垢剂温度、不同浸泡时间分组进行水垢去除试验,记录试验结果并进行统计学分析。结果在相同的除垢条件下,水垢的去除难度为:金黄色水垢混合水垢白色水垢;当其他条件相同时,在除水垢剂中浸泡时间越长,水垢去除效果越好;当其他条件相同时,除水垢剂的温度越高,水垢的去除效果越好。结论水垢特性、除水垢剂温度及浸泡时间是医疗器械水垢去除工作中的重要因素,只有掌握好这些因素,才能更有效地去除水垢,保证医疗器械的清洁。     

Characteristics of a new ultrasonic apparatus for removing dental calculus

The use of piezoceramic transducers and high-efficiency ultrasonic oscillation system with replaceable working heads sharply decreased electric energy consumption, the dimensions and mass of the new "Ultradent" unit for odontolithic removal.