本文選題：低溫等離子體　切入點：開關電源　出處：《杭州電子科技大學》2017年碩士論文

【摘要】：低溫等離子手術設備通過高頻交流電壓電離生理鹽水來產(chǎn)生等離子體。而等離子體的強活性和高頻電流的熱效應面對生物組織時,能夠達到消融、切割、凝血等多種手術功能。低溫等離子手術具有操作方法簡便、操作溫度低、手術創(chuàng)傷小、術后恢復快、治愈率高等諸多優(yōu)點,在微創(chuàng)手術中有著突出的表現(xiàn)。在最近的十幾年里,隨著醫(yī)療水平的快速發(fā)展,微創(chuàng)手術在各個科室得到了越來越廣泛的應用,對低溫等離子手術設備的需求也在不斷增長。但目前的消融設備體積大、功能少,給醫(yī)生帶來諸多不便。本文致力于研發(fā)一臺小型化的多功能低溫等離子手術設備。低溫等離子手術設備輸出不同頻率、不同幅度的交流電壓會產(chǎn)生不同狀態(tài)的等離子體,針對不同部位的人體組織能達到不同手術效果。通常會通過調(diào)節(jié)交流信號的電壓幅度來完成對不同細胞組織的手術,利用不同頻率的交流信號來達到不同的手術效果。此外,連續(xù)與斷續(xù)的高頻交流電壓也能實現(xiàn)不同的手術效果�；谶@一生物理論,采用開關電源技術設計一臺集成多個工作頻段、多種輸出波形、輸出電壓可調(diào)的高頻方波逆變器。高頻逆變器的設計往往會涉及到變壓器,受變壓器特性限制,不同逆變頻率需要匹配不同的繞組匝數(shù)。多個交流頻率輸出的逆變器通常會采用多個逆變回路來實現(xiàn),但這會導致設備的體積變大和成本增加。本文利用變壓器匝數(shù)與伏秒積的線性正比關系,根據(jù)輸出頻率的設置及實時輸出電壓來調(diào)節(jié)逆變驅(qū)動信號占空比,用同一回路完成不同頻率的逆變。采用可編程邏輯器件CPLD代替?zhèn)鹘y(tǒng)的模擬集成芯片來產(chǎn)生逆變驅(qū)動信號,使控制更加靈活、可靠。由此,可在不增加設備體積的基礎上可提供多種輸出波形用于手術。本文以等離子體及高頻電流對生物組織的消融效應為根本原理,以開關電源為技術核心,開發(fā)了一臺多波形輸出的低溫等離子手術系統(tǒng),并獲得以下成果:(1)輸出斷續(xù)或連續(xù)的100KHz或310KHz的方波信號,配合不同手術刀頭實現(xiàn)多種手術功能。(2)輸出電壓在8V~148V內(nèi)可調(diào),以適應不同部位的生物組織。(3)具有短路保護,確保手術過程中安全性。(4)提高了系統(tǒng)功率,實現(xiàn)系統(tǒng)的穩(wěn)定性。
[Abstract]:Low-temperature plasma surgery equipment ionization of saline by high-frequency AC voltage to produce plasma.The strong activity of plasma and the heat effect of high frequency current can achieve many kinds of surgical functions, such as ablation, cutting, coagulation and so on.Low temperature plasma surgery has many advantages, such as simple operation method, low operating temperature, small surgical trauma, quick postoperative recovery, high cure rate and so on, so it has outstanding performance in minimally invasive surgery.In the last decade, with the rapid development of medical treatment, minimally invasive surgery has been more and more widely used in various departments, and the demand for hypothermia plasma surgery equipment is also increasing.However, the current ablation equipment is large in size and less in function, which brings a lot of inconvenience to doctors.This paper is committed to the development of a miniaturized multi-functional low-temperature plasma surgery equipment.The low temperature plasma surgery equipment outputs different frequency, the different amplitude AC voltage will produce the different state plasma, according to the different position human body tissue can achieve the different surgical effect.The operation of different cell tissues is usually accomplished by adjusting the voltage amplitude of AC signals, and different surgical effects are achieved by using different frequency AC signals.In addition, continuous and intermittent high-frequency AC voltage can also achieve different surgical results.Based on this biological theory, a high frequency square wave inverter with multiple working frequency bands, multiple output waveforms and adjustable output voltage is designed by using switching power supply technology.The design of high frequency inverter often involves transformer. Due to the limitation of transformer characteristic, different inverter frequency needs to match different winding turns.Inverters with multiple AC frequency outputs are usually implemented with multiple inverter circuits, but this will result in larger volume and higher cost of the equipment.In this paper, the linear proportional relation between transformer turns and volt second product is used to adjust the duty cycle of inverter driving signal according to the setting of output frequency and the real time output voltage, and the inverter with different frequency is completed by the same loop.The programmable logic device (CPLD) is used instead of the traditional analog integrated chip to generate the inverter driving signal, which makes the control more flexible and reliable.Thus, a variety of output waveforms can be provided for surgery without increasing the volume of the equipment.Based on the ablation effect of plasma and high frequency current on biological tissue, a low temperature plasma surgery system with multi-waveform output is developed in this paper, which is based on switching power supply.The following results are obtained: 1) output intermittent or continuous square wave signals of 100KHz or 310KHz, combined with different scalpel heads to achieve multiple surgical functions. The output voltage can be adjusted within the 8V~148V to adapt to the short circuit protection of different parts of biological tissue.Ensure the safety during the operation. 4) improve the power of the system and realize the stability of the system.
【學位授予單位】：杭州電子科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：R61;R319

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