bme 462 electrode selection, testing and placement zexi liu, ashley mulchrone, yue yin 09/30/2014
TRANSCRIPT
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BME 462Electrode selection, testing and
placement
Zexi Liu, Ashley Mulchrone, Yue Yin 09/30/2014
![Page 2: BME 462 Electrode selection, testing and placement Zexi Liu, Ashley Mulchrone, Yue Yin 09/30/2014](https://reader035.vdocument.in/reader035/viewer/2022062421/56649cc15503460f94988abb/html5/thumbnails/2.jpg)
Electrode Selection
Dry-Contact and Noncontact Biopotential Electrodes:Methodological Review, Yu Mike Chi etc.
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Wet Electrode• Reusable• Low-cost• Produce reliable signals in
different conditions• Adhesive material to lower skin
impedance, buffer electrode against mechanical motion
• Most common in clinical setting
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Floating Electrode• Metal disk is recessed,
swimming in the electrolyte gel• It is not in contact with the skin• Reduces motion artifact
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Dry Electrode
Flexible dry surface-electrodes for ECG long-term monitoring, Klaus-Peter Hoffmann and Roman Ruff
• Direct contact with skin• No electrolyte• Use moisture on skin• Work well for quick
measurement• Motion artifact
Ex. Polysiloxane framework with conductive nano-particle
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Non-contact Electrode
Dry-Contact and Noncontact Biopotential Electrodes:Methodological Review, Yu Mike Chi etc.
• Gap between skin and sensor• No dielectric layer• Measure through hair, clothing
or air• A need to design amplifier to
acquire signals
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Electrode Placement
• 3 Lead ECG
• Einthoven’s Triangle• 2 leads (3rd can be calculated)
• 4 electrodes
• Current Standard – any part of arms/legs below the shoulders and the gluteal fold• Shoulders and wrist are
approximately equal
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Electrode Placement• Mason-Likar placement –
mainly used for exercise• Diminishes QRS complex• Rightward axial shifts
• Torso placement• Obscure myocardial infarction
(create or mask)
• Motion artifact – muscle noise• Bone• MuscleStandard Mason-Likar
http://pmj.bmj.com/content/81/952/122.full