Micro elctroeds

Metal micro electrodes (or) Metallic electrodes
Micropipette electrode

1. OMD 551 – BASICS OF BIO MEDICAL INSTRUMENTATION MICRO ELCTRODES

2. MICRO ELCTRODES Used to measure the potential within the cell. Tip diameter ranging from 0.05 to 10µm Very small in diameter so during insertion of micro electrodes into the cell there will not be any damage to human cell

3. MICRO ELECTRODES-TYPES Metal micro electrodes (or) Metallic electrodes Micropipette electrode

4. Metal micro electrodes (or) Metallic electrodes

5. Metallic electrodes Metal electrode is fine needle of a strong metal Insulated by an appropriate insulator up to its tip Fabricated by stainless steel, platinum-iridium alloy and tungsten Tungsten carbide is also used because of its great strength

6. Supported metal micro electrode 2 different materials are used to make supported metal electrode Strong insulating material is used for giving basic support Metal with good conductivity used at contacting portion of electrode

7. Micropipette Electrode Used to measure the potential within the cell Instead of metal electrolyte, non-metallic materials is used Fabricated from glass capillaries

8. Micropipette Electrode

9. Electrical properties or Equivalent circuit of micro elctrodes

10. Glass electrode with its tip placed with in cell

11. Equivalent circuit