ECG Electro Cardio Gram.

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Presentation transcript:

ECG Electro Cardio Gram

ECG מטרת המערכת הבט ביולוגי - האותות החשמליים בלב. ניתוח האותות הנמדדים הבט הנדסי - מבנה מערכת המדידה.

ECG Electro Cardo Gram /Graf ? רישום של האותות (הדחפים) החשמליים הקובעים את פעולת הלב. בדיקה חיצונית, פשוטה, יעילה וזולה לאבחון בעיות קרדיולוגיות.

מה מאבחנים ערכו של קצב פעולת הלב אי סדירות בקצב פעולת הלב שינויים במחזור פעולת הלב עוצמת האותות החשמליים בלב

הפעילות החשמלית בלב הולכה קיצוב אבחנה

מבנה הלב ומרכיבי המערכת החשמלית

האותות החשמליים בלב

שיטת המדידה מדידה בתקופה של 24 שעות (Holter) מדידה בשכיבה מדידה במאמץ

מערכת המדידה תצוגת האות מעגל הגברה וסינון אלקטרודות

Skin impedance for 1cm2 patch: ממשק אלקטרודה עור Sweat glands and ducts אלקטרודה אפידרמיס Dermis and subcutaneous layer Ru Ehe Rs Rd Cd ג'ל Re Ese EP RP CP Ce שכבת העור 100 m Nerve endings Capillary Skin impedance for 1cm2 patch: 200kΩ @1Hz 200 Ω @ 1MHz

מגבר מכשור Inverting amplifier Q. What should be R1…R4 for a gain of 1000? Differential amplifier but whose gain can be adjusted by R1, R2, R3, R4 Note that R’s and C’s are “matched” Op amp’s noninverting input has a very high input impedance Non-inverting amplifier Differential amplifier

מימוש הגברה וסינון עם AD620

מדידות באמצעות פורייה

פעילויות עם תלמידים בניית מכשיר ברמת המגברים. צפייה באות הנמדד בסקופ או בתוכנה מתאימה מדידה באמצעות אוגר נתונים סינון האות הנמדד חישוב קצב פעימות הלב ניתוח מחזור מדידה: P,QRS,T זיהוי מצבים פתולוגיים (קבצים מוכנים מראש)

ECG The End