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线性脚踏控制器作为白内障超声乳化仪的主要控制部件,对整机的性能有着重要影响.文中介绍了1种使用光电编码器的线性脚踏控制器,从机械组成、计数电路和控制软件3个方面详细介绍它的工作原理及功能实现.该线性脚踏控制器,具有数字化输出、结构简单、操作方便和反应灵敏等优点,在临床上有着广泛的应用前景. 相似文献
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本文介绍了光电式和磁电式编码器的原理、结构和特性,结合医疗设备中的应用实例,探讨了两类编码器的维护方法。 相似文献
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目的:针对串联机器人在危险生化品处理方面的应用,选取一种安全系数高、灵活轻量的机械臂并对其进行运动学建模和轨迹规划。方法:先对机械臂进行运动学建模,之后推导并验证正运动学和逆运动学公式,然后利用微分变换法求取机械臂的雅可比矩阵,最后对机械臂在关节空间和直角坐标空间进行轨迹规划。结果:通过对串联机器人的轨迹规划,可使其形成光滑连续的理想运动曲线,使串联机器人在空间上的运动更加平稳高效。结论:该研究有助于使串联机器人更好地应用于危险生化品处理的场景,也可以为串联机器人的其他相关研究提供参考。 相似文献
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目的:应用国产CAS-R-2型机器人系统(以下简称机器人),临床实施121例脑出血无框架立体定向手术。方法 机器人系统由智能机械臂、影像引导装置、三维定位软件等模块组成。该系统取代了传统的定向仪框架,通过识别贴附于患者头部的标志点.建立相应的三维坐标体系,并可自动标出靶点位置和穿刺轨迹。智能机械臂按照模拟轨迹固定方向,为术者提供准确导航和操作平台。结果:成功实现121例脑出血无框架脑立体定向穿刺置管引流手术,其中基底节区出血71例、脑叶出血19例,丘脑出血22例、小脑出血9例。结论:利用机器人辅助完成无框架立体定向手术,是一种方便快捷、定位准确、创伤小、安全有效等优点,应用前景广阔。 相似文献
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介绍了干化学法kubelka理论.结合光敏元件的特征方程,推导出简单实用的光反射测定公式。利用该测定公式,笔者设计出性能良好的尿糖测定装置,进一步证实了该公式的有效性和可靠性。 相似文献
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“大力神”外骨髂主要由机械腿(结合有机械装置、计算机和电子装置)和背部支撑架组成,使穿戴者能够轻松背负重物。该外骨骼未来还将配装机械臂,以使穿戴者能够搬运重物。 相似文献
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介绍了X线摄影放大装置,利用X线几何投影和光学成像原理,采用单片机软件编程,通过光耦技术和变频调速技术,实现仪器的自动控制。临床试验表明,该X线放大装置用于摄取开放大人体小部位的病灶是可行的。 相似文献
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目的:研制一个能模拟各种血氧状态的虚拟手指——血氧模拟器,用于检测临床监护仪的血氧监护模块和家庭使用的血氧测量仪的性能。方法:从仪器整体需求入手,着重对微弱光信号检测及分离、光信号调制和发光二极管驱动电路这三大核心模块进行电路设计及噪声分析,提出解决方案和性能指标要求,合理选择硬件电路中的元器件,使模拟仪具有测量精确、实用便捷的功能。结果:采用模拟电路技术对系统中三大核心电路模块进行分析和设计,完成了一个功能相对完备的血氧饱和度模拟仪的设计与制作。结论:通过与其他血氧模拟仪的比对,可判断该血氧模拟仪在模拟精度、模拟速度、稳定性、功耗、便携等方面的性能均达到同类产品的水平,具有很大的市场潜力与推广价值。 相似文献
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The paper outlines the optical properties of blood as a random unhomogenous scattering and absorbing medium and presents the basic characteristics of single erythrocyte diffusers. It also shows how the above dependencies are used in particular oximeters. The first world's laser oximeter designed by the authors is described. 相似文献
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给大鼠染锰(MncL_2·4H_2O,15mg/kg/d,ip)4、8周,再用PAS一Na(120mg/kg/d,ip)治疗3周后,通过光、电镜观察PAS一Na对染锰雄性大鼠生殖毒性的影响。结果表明,染锰4、8周大鼠睾丸的支持细胞中溶酶体增加。此外,在染锰8周大鼠的睾丸中还观察到各级精细胞减少,细胞核呈不规则性改变。在光镜下也观察到曲细精管变性的表现,受损严重者,仅残存支持细胞和少量的精细胞,管腔中的精子消失。附睾尾的精子密度明显降低,精子畸形率升高。经PAS一Na治疗后,睾丸病理组织学的表现恢复正常,精子数上升到正常水平,精子畸形率降低。提示PAS一Na可拮抗锰的雄性生殖毒性。 相似文献
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P M Swearengen W F Vance D L Counts 《American Industrial Hygiene Association journal》1988,49(12):608-612
The authors studied the performance of laser protective eyewear currently in use at the Lawrence Livermore National Laboratory: a goggle with a cellulose propionate filter from Glendale Protective Technologies and a goggle with a glass optical filter from Spectra Optics. A new polycarbonate optical filter material from Glendale was studied also, and its performance was compared with that of the cellulose propionate material. The authors used three lasers in the study: a single-pulse (variable pulse length) Nd:YAG laser with a wavelength of 1064 nm; a pulsed copper-vapor laser with a pulse-repetition frequency of 6.08 kHz and a wavelength of 510.6 nm; and a pulsed xenon-fluoride laser with a repetition rate variable up to 100 Hz and a wavelength of 351 nm. Where possible, the output power of each laser was increased systematically to the damage threshold of the material and beyond. The results showed that the new polycarbonate optical filter suffered less damage at equivalent laser beam challenges than the cellulose propionate optical filter. The glass goggle, which was designed specifically for use at the 510.5-nm wavelength, sustained no visible damage from the specified laser light at the highest power levels the authors could achieve. 相似文献
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研制的多道程控刺激仪能够根据操作者要求,以多种模式向电极阵列送出指定幅度和脉宽的脉冲。刺激仪由单片机定时器控制时间参数,由CPLD控制空间参数,由电源控制幅度参数。摒弃了传统变压器隔离的方法,采用光电耦合以及浮地等设计,以达到生理研究需要的安全标准。 相似文献
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I P Chung D Dunn-Rankin R F Phalen M J Oldham 《American Industrial Hygiene Association journal》1992,53(4):232-236
A low-cost wind tunnel for aerosol studies has been designed, constructed, and evaluated for aerosol uniformity with 2- and 0.46-micron particles. A commercial nebulizer was used to produce the suspended test particles, and a custom-made, four-hole injector was used to introduce the aerosol into the wind tunnel. A commercially available optical particle counter measured the particle concentration. Performance tests of the velocity profile and particle concentration distribution at two flow rates showed that the system performs well for small particles. 相似文献
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Butson MJ Cheung T Yu PK 《Australasian physical & engineering sciences in medicine / supported by the Australasian College of Physical Scientists in Medicine and the Australasian Association of Physical Sciences in Medicine》2008,31(3):203-206
RTQA Gafchromic, radiochromic film is assessed for its radiation energy dependence in photon beams ranging from superficial to megavoltage energies. RTQA radiochromic film has uses in radiation quality assurance procedures due to its auto development and visualisation properties. These properties allow for immediate comparison of x-ray alignment and coincidence not available with radiographic films. Results show that the RTQA film produces an energy dependant darkening to x-rays which results in x-ray energies of 69 keV photon equivalent (150 kVp) to produce 2.14 times the optical density to dose ratio of a 6MV x-ray beam. The following dose ratio's (normalized to 1 at 150 kVp) provide the same net optical density change for RTQA film. 1.47-50 kVp : 1.21-75 kVp : 1.09-100 kVp : 1.01-125 kVp: 1.00-150 kVp : 1.03-200 kVp : 1.07-250 kVp : 2.14-6 MVp : 2.14 10 MVp. Although the film is not designed to be used as a quantitative measure of radiation it is still useful to know its energy response at differing x-ray energies to expose the film to the appropriate dose to provide optimal darkening characteristics for a given QA test at the appropriate energy. Our results have shown that a 0.3 optical density change with RTQA film provides a colour change level useable for accurate alignment procedures 相似文献