簡(jiǎn)易心電圖儀的設(shè)計(jì)

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1、本科畢業(yè)設(shè)計(jì)簡(jiǎn)易心電圖儀的設(shè)計(jì)摘要隨著社會(huì)的發(fā)展和人們生活水平的不斷提高，人們對(duì)健康的重視程度與日俱爭(zhēng)特別是近年來(lái)老齡化得加劇，而且心血管疾病的發(fā)病率也不斷上升。目前心血管疾病成了威脅人類生命的主要疾病，心臟病已經(jīng)成了世界上死亡率最高的疾病。鑒于這種嚴(yán)峻形勢(shì)，提高預(yù)防和監(jiān)測(cè)該疾病的手段勢(shì)在必行。而心電信號(hào)是發(fā)現(xiàn)心臟病的最直接手段。但目前醫(yī)院用的心電監(jiān)護(hù)價(jià)格昂貴，維護(hù)費(fèi)用高，患者檢查的經(jīng)濟(jì)負(fù)擔(dān)重，不能做到隨時(shí)地都能檢查。因此設(shè)計(jì)一種便攜式，價(jià)格便宜且實(shí)用的心電監(jiān)護(hù)儀器具有重要意義。人體心電信號(hào)中的各種生理參數(shù)都是由復(fù)雜生命體(人體)所發(fā)出的強(qiáng)噪聲條件下的微弱信

2、號(hào)（除體溫等直接測(cè)量的參數(shù)外），心電信號(hào)的幅值在10uV～4mV之間,頻率的范圍為0.05～100Hz，其中淹沒在50Hz的工頻干擾中和人體的其他信號(hào)中，檢測(cè)的過(guò)程及其方法比較的復(fù)雜。除去信號(hào)檢測(cè)過(guò)程中的干擾、噪聲，進(jìn)行心電信號(hào)的分析是由心電圖儀的重要功能之一。本文考慮從人體心電信號(hào)的特點(diǎn)-信號(hào)微弱，低頻，高阻抗，不穩(wěn)定性和隨機(jī)性。采用了心電性信號(hào)的輸入—右腿驅(qū)動(dòng)電路、三級(jí)放大電路-前置放大，電壓放大，功率放大。并用Multisim軟件進(jìn)行模擬仿真。該由運(yùn)算放大器構(gòu)成的簡(jiǎn)易心電圖儀，具有體積小，攜帶方便，實(shí)用性強(qiáng)等優(yōu)點(diǎn)。關(guān)鍵詞：微弱信號(hào)；運(yùn)算放大；心電圖Ab

3、stractWiththesocialdevelopmentandcontinuousimprovementoflivingstandards,peoplewiththeemphasisonhealth,especiallyinrecentyearsatboththeagingofwarhaveincreased,andtheincidenceofcardiovasculardiseasearealsorising.Cardiovasculardiseaseiscurrentlythemainthreattohumanlifehasbecome,heartd

4、iseasehasbecometheworld'shighestmortality.TheECGsignalisfoundinthemostdirectmeansofheartdisease.However,thehospitalECGuseexpensive,highmaintenancecosts,checktheeconomicburdenofpatientsandcannotbecheckedatanytime,anywhere.Thereforethedesignofaportable,cheapandpracticalECGmonitoringe

5、quipmentisofgreatsignificance.Thefrequencychangesfrom0.05Hzto100Hz.Theelectrocardiacsignalisinundatedwith50Hzelectricfrequencysignalandotherperson’ssignal.Theelectrocardiacsignalisoneofthemostimportantcheckingprocedureandmethodarecomplex.WeconsiderboththecharacteristicsofhumanECG-w

6、eaksignal,lowfrequency,highimpedance,instabilityandrandomness.Withtheheartelectricalsignalinput-rightlegdrivecircuit,three-levelamplifiercircuit-pre-amplification,voltageamplification,poweramplification..Giventhisgrimsituation,improvethepreventionandmonitoringofthediseasemeansimper

7、ative.ConstitutedbytheoperationalamplifierdesignedinthispaperasimpleECG,withasmall,portable,practicaldvantages.Keywords:Weaksingal；OpZoom；ECG目錄摘要IIAbstractIII目錄IV第1章緒論11.1心電圖儀的發(fā)展史11.2國(guó)內(nèi)外現(xiàn)狀11.3心電信號(hào)基本理論21.4心電信號(hào)的特點(diǎn)3第2章心電圖儀的基本原理42.1心電圖儀的基本組成框架42.2心電圖儀的輸入部分設(shè)計(jì)42.2.1心電信號(hào)的檢測(cè)42.2.2抑制心電信號(hào)中50

8、Hz共模信號(hào)干擾的有效方法52.3心電圖儀中心電放大