【作者】 刘旭娟；

【导师】 田学隆；

【作者基本信息】 重庆大学 ， 生物医学工程， 2009， 硕士

【摘要】 血液粘度是血液最基本的流变特性,是血液流变学研究的核心。临床研究表明,许多危害人类健康的常见病均与血液粘度升高有关。在一定范围内,血液粘度值可作为诊断(甚至是早期诊断)疾病转归和疗效判断的主要指标。本课题结合国内外血液粘度测试仪的研究现状,在传统锥板式血液粘度仪的基础上设计出一种新型全自动血液粘度测试仪:采用技术比较成熟的51单片机作为中心智能单元;通过驱动锥体转动并测齿盘瞬时衰减速度来计算锥体在不同转速下受到的阻力矩,从而获得不同剪切率下的血液粘度值。这既克服了传统锥板式血液粘度仪采用拉力传感器测力矩不易测量的弊端,又符合血液粘度仪向便携化、实用化方向发展的趋势,有着重要的现实意义。根据新型锥板式血液粘度仪的设计原理和功能需求,选择中心处理器AT89C51单片机和C语言。对控制系统进行模块划分,其中包括电机驱动控制模块、转盘驱动控制模块、转盘转速测量模块、小键盘输入模块、LCD显示模块、串口打印机模块、温度控制模块、看门狗模块等,详细介绍了各硬件模块设计思路及具体电路,给出了各功能模块的驱动程序。应用结果表明,该控制系统运行稳定可靠,操作简单;利用标准质控液进行整机的性能测试,测量结果在质控液参数范围之内,重复率在2%以内,符合医用标准。更多还原

【Abstract】 Blood viscosity is the elementary characteristic and the main research object of hemorheology. Clinical research reveals that a lot of diseases are caused by the raise of blood viscosity parameter. In certain scope, blood viscosity parameter is the main one to diagnose (even early diagnose) the diseases and judge the curative effect.Combining with current domestic and international research actuality of blood viscometers, the paper introduces a new type cone and plate blood viscosity testing device, which is based on the traditional viscometer. On the one hand, single-chip microcomputer 51 which has mature technology is used as the central intelligent unit. On the other hand, by driving the cone and detecting the instantaneous attenuation rate of the dial, the drag torque of the cone at different rate could be calculated in order to achieve the blood viscosity at different cut-rate. This design not only avoids using pull sensor to get the drag torque which is not easy to measure, but also contributes to the minimization of blood viscometers, which has great practical importance.According to design principles and functional requirements of the new type cone and plate blood viscosity testing device, the AT89C51 single-chip and C program language is chosen. Then control system could be divided into some function modules, including motor controlling, turntable controlling, rotate speed testing, mini-keyboard inputting, LCD displaying, serial-port connected printer, temperature controlling, watch dog, etc. Meanwhile the design concept, circuit diagram and drive program of modules are given in detail. Finally, this paper presents the test process of the whole system and sample experiment, analyzes the results, and summarizes the advantages and disadvantages of this system.更多还原