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摘要由于双极电外科手术效率高、止血快、热损伤小等特点，受到了广大医生的关注。目前，国外对双极外科机理的研究相对深入，已经研制出了一批先进的双极电凝系统。这些系统现在可以做到2.0到3.5毫米的热损伤，以及直径7毫米的血管闭合。但是我国的双极电凝系统才刚刚开始发展，能过做到的热损伤在4到10毫米，电凝机理方面也很不完善。在这种情况下，开展对双极电凝机理和规律以及双极电凝电源系统的研究是十分重要的。33532
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因此，本文首先分析了生物组织焊接的机理，并且分析了集肤效应、生物组织的温度阻抗特性、细胞组织的温度特性对生物组织焊接的影响。根据这一系列的影响因素，以及机理的分析，确定了电源设计的方案。根据机理和方案，完成了硬件电路及其控制系统的设计和电流和功率控制系统的设计以及模式选择和参数调节系统的设计。并成功实现了电流和电压的实时监控。
关键词 双极电凝 生物组织焊接 高频电源
毕业论文设计说明书外文摘要
Title The Development of Frequency Current Biological Tissue Welding Power Control Circuit and Impedance Sensing Circuit
Abstract
Because of the bipolar electric surgical procedure with high efficiency, fast hemostasis, low thermal damage,many doctor pay attention to it.Abroad at present, the study of double electric coagulation mechanism relatively thorough, has developed a number of advanced bipolar electric coagulation system.These systems can now be thermal damage, 2.0 to 3.5 mm and 7 mm in diameter of blood vessels are closed.But the bipolar electric coagulation system in our country has just begun development, can do that thermal damage in 4 to 10 mm, electric coagulation mechanism is not perfect.In this case, the bipolar electric coagulation mechanism and regularity and bipolar electric coagulation research of power systems is very important.
Therefore, this article firstly analyzes the mechanism of biological tissue welding, and analyzed the skin effect and temperature resistance properties of biological tissue, the temperature of the cell tissue characteristics of welding.According to a series of factors, and the analysis of the mechanism, the power supply design scheme is determined.According to the mechanism and scheme, completed the design of hardware circuit and its control system and control system of current and power design and model selection and parameters of the adjustment system design.And successfully realized the real-time monitoring of current and voltage.
Keywords bipolar electro-coagulation biological tissue welding high frequency generator
目 次
1 绪论 1
1.1 选题背景与意义 1
1.2国内外现状 2
1.3本项目研究内容 4
2 高频电流生物组织焊接功率控制电路研制 4
2.1生物组织焊接机理及其影响因素 5
2.1.1集肤效应对电凝过程的影响 5
2.1.2 细胞的温度特性对组织焊接的影响 7
2.1.3生物组织的温度阻抗特性 8
2.2生物组织焊接对功率控制电路的要求 9
3 高频电流生物组织焊接功率控制电路设计 11
3.1 限电流控制系统 11
3.2 限功率控制系统 12
3.3 电流与功率的协同控制策略 13
3.3.1PID 控制程序设计 14
3.3.2负载阻抗的计算程序设计 15