ECG原理與技術(shù)

1、 心臟是人體血液循環(huán)的動力裝置，心臟自律不斷地心臟是人體血液循環(huán)的動力裝置，心臟自律不斷地進(jìn)行有節(jié)奏的收縮和舒張活動，使血液在閉鎖的循環(huán)系進(jìn)行有節(jié)奏的收縮和舒張活動，使血液在閉鎖的循環(huán)系統(tǒng)中不停的流動，使生命得以維持統(tǒng)中不停的流動，使生命得以維持。 心肌細(xì)胞的除極、復(fù)極過程和動作電位心肌細(xì)心肌細(xì)胞的除極、復(fù)極過程和動作電位心肌細(xì)胞在興奮時所發(fā)生的電位變化稱為動作電位，即心胞在興奮時所發(fā)生的電位變化稱為動作電位，即心肌細(xì)胞的除極和復(fù)極過程（如圖）。肌細(xì)胞的除極和復(fù)極過程（如圖）。舊式的心電圖機(jī)多數(shù)采用熱筆在熱敏紙上記錄波形,存在著打印效率低、噪聲大、波形失真等缺點(diǎn);而熱敏打印機(jī)的熱敏頭是由一排體

2、積很小( 8個/mm)的加熱單元組成的,每個加熱單元加熱時與之相接觸的熱敏紙的對應(yīng)位置將會變黑,通過控制各個加熱器件的加熱與否即可控制每一行的打印內(nèi)容,再由步進(jìn)電機(jī)控制走紙換行,從而在熱敏紙上繪制出各種圖形。由于熱敏打印機(jī)具備體積小、重量輕、可靠性高、打印字符清晰、噪聲小、走紙均勻等特點(diǎn),因此成為新型心電圖機(jī)的首選金屬反應(yīng)金屬反應(yīng)電極電位電極電位(V)(V)Zn Zn2+ +2e 0.763Ni Ni2+ +2e0.250Cu Cu2+2e0.337Ag Ag + e0.799AgCl+e0.22312SLTM金標(biāo)準(zhǔn)分析程序 屏幕3通道顯示，12導(dǎo)可同步打印 自動，手動，心率失常模式 內(nèi)置歐洲

3、標(biāo)準(zhǔn)的HEART分析軟件QTD的精確分析 報(bào)告準(zhǔn)確，格式多樣 交直流兩用 可升級運(yùn)動測試系統(tǒng) 抗漂移系統(tǒng)(ADS)及自動基線調(diào)整 主要規(guī)格： 導(dǎo)聯(lián)：標(biāo)準(zhǔn)12導(dǎo)聯(lián) 增益轉(zhuǎn)換：5，10，20，40mV，手動或自動 記錄紙：GE marquette-hellige式對比度熱敏紙300*210mm電源：交流電源：85-264V,直流電源：內(nèi)置電池 外形尺寸：370*320*95（mm） 重量：5.6Kg（含電池組）Device cannot be switched on even though power plug is plugged in- green power lamp LED is off

4、and device cannot be switched on:- Power cable defective or not plugged in correctly?- Primary fuses in the mains input module defective?- Connector from the mains input module to the mains switching power supplyplugged in correctly, or cable defective?- Connector from the mains switching power supp

5、ly to connector POSUP/ on thePCB Control plugged in correctly, or cable defective?- Keypad via connector KEYB/ on PCB Control plugged in correctly?- 26,5V on the connector POSUP? if no: - mains switching power supply defective if yes: - PCB Control defective- or keypad defective- green power lamp LE

6、D is on, but device still cannot be switched on: - PCB Control defective- or keypad defectiveDevice cannot be switched on when being battery-operated only- Is the battery depleted?- Plug in power plug, green power lamp LED should glow and the device can beactivated, if not: - refer to Device cannot

7、be switched on even though powerplug is plugged in”.- By connecting the power plug, rapid charging is activated, LED1 on the PCBBattery Charge is activated if not: - PCB Battery Charge is defective- With power plug plugged in, let unit charge for 10 minutes, then disconnectpower plug. Can the device

8、 be switched on and can a recording be started? if yes: - Function OK., continue loading with plugged mains plug if not: - Battery disconnected or cable defective?- Battery defective (no capacity)?- PCB Battery Charge defective ( Si1?)?No display on the screen- Does the yellow Stop LED on the keypad

9、 glow after the device is switched on? if not: - refer to Device cannot be switched on .” if yes: - continue- Does a beep sound approx. 10s after switching on the MAC1200 occur (indicatesthe successful power up self-test)? if not: - Self test error, PCB Control defective if yes: - continue- Contrast

10、 badly adjusted?- Can the background illumination be activated by pressing a key?- Can the display test in Section 3.3 be applied successfully? if not: - graphics display module defective- or PCB Control defectiveMAC 1200 fails to give printout, no paper transportPerform the following test in the 6-

11、lead operating mode:- Paper available? Paper correctly inserted? Paper transport problems (jam)?- Paper feed flap correctly engaged on both sides?- After pressing the start key, the green start Led must glow if not : - keypad defective? Apply keypad test in Section 3.4 if yes: - continue- Paper feed

12、 flap correctly engaged on both sides?- Mark reader defective or not plugged in?- All connections for printhead and Motor are plugged in?- Motor blocked ? (check roller, transmission)- Operating only on battery which is strongly depleted? if yes: - plug in power plug if not: - PCB Control defectiveP

13、aper transport functions, no printout- Paper feed flap correctly engaged on both sides?- All connectors for printhead plugged in?- Operation with strongly depleted battery? if yes: - plug in power plug if no: - PCB Control defective- or printhead defectiveMAC 1200 prints, but only baselines are printed out- Electrodes applied correctly?- Electrode cables pl