【作者】 王静；

【导师】 周庆；

【作者基本信息】 云南大学 ， 物理电子学， 2015， 硕士

【摘要】 随着医疗电子器械的飞速发展,在生物医学领域中,生物电检测技术占有重要的地位。目前射频热凝器的治疗效果主要通过患者的感觉描述和后期疗效来评定,反馈效果慢,存在偏差,降低了仪器的治疗性能。本文研究目的为通过对病变生物组织射频前后生物电信号变化的研究,即时分析射频热凝的治疗效果,据此来优化射频热凝器的性能。本文通过对国内外生物电信号检测技术研究现状的分析,研制出一种高精度、可操作性强的生物电信号评估系统,主要进行以下三方面的工作。首先,基于生物电检测技术,设计了生物电信号评估系统硬件电路。由于生物电信号微弱、并且易受干扰,因而对信号采集电路灵敏度、共模抑制、抗干扰等方面都有较高的要求。在本论文中采用高精度信号处理电路,提高系统稳定性和测量精度。采用信号隔离、电源隔离等方法,提高系统的安全性和可靠性。采用自动可变增益放大电路,提高被测检测信号范围和系统检测精度。其次,基于硬件电路设计了嵌入式软件,嵌入式软件基于IAR6.5集成开发环境,采用嵌入式C语言编写,实现信号采集、数字滤波、数据传输、系统控制等功能。最后,设计并编程实现上位机软件。上位机软件基于PC机强大的数据处理功能,提供丰富的界面显示效果,方便系统调试和用户应用,提供良好的操作体验。经系统测试后,生物电信号评估系统精度高、稳定性好,人机界面良好,基本达到设计要求。更多还原

【Abstract】 With the rapid development of medical instruments, bio-electrical detection technology takes a very important position in the development of biomedical domain. At present, the treatment effectiveness evaluation of radio-frequency lesion generator (RFG) depends on the oral dictate of patients and later response. However, the feedback is slowly and there are deviations. To a great degree, it impacts on the performance of the RFG. The purpose of this paper is to study the discrepancy of radio-frequency lesions therapy in the abnormal biological tissues before and after. According to the discrepancy, we analyze the treatment effectiveness of the REG instantly and improve the performance of the RFG.In this paper, we develop a precise and usable biological electrical signal evaluation system based on bio-electrical acquisition technology and the analysis of its development situation. Three main tasks are involved in the paper.First of all, hardware electric circuit of bio-electrical evaluation system is designed based on the bio-electrical signal detection technique. Bio-electricity signal is extremely weak and easily to get interfered. Therefore, it raises higher requirements on the circuits in terms of sensitivity, common mode rejection, anti-interference, etc. In this paper, high-precision digital signal processing circuit is used to improve system stability and accuracy. In order to improve safety and reliability of the system, signal isolation and power isolation is used in the circuit. Variable gain amplifier is used to improve the range of the signal which is detected and the accuracy of the system.Then, the embedded-software is designed based on hardware electric circuits. We develop the embedded-software based on IAR6.5and C programming language, aiming to achieve the goal of signal sampling and transmitting, system controlling, etc.Finally, PC software system is designed and programmed. The PC software can provide abundant display results based on the powerful data processing function of PC. It facilitates the system debugging and users application, lead the whole system to be a better user experience. The bio-electrical signal evaluation model is proved to perform with high-precision, high stability and good man-machine interface, and basically achieved the requirement.更多还原