We may categorize electrodes into two possible types albeit theoretically: those that are perfectly polarizable and those that are perfectly non-polarizable. This categorization is based on what happens to an electrode when a current passes between it and the electrolyte. … Read More
Tag: Bioelectrodes
Commonly used EEG Electrodes
The most commonly employed electrodes for recording electroencephalographic signals from the brain (EEG) are cup electrodes and subdermal needle electrodes. Cup electrodes are fabricated from platinum or tin approximately 5-10 mm in diameter. These cup electrodes are filled with a … Read More
Key Properties of Bioelectrodes
To record biopotentials, an interface is required between the electron-conducting copper wires connected to signal conditioning amplifiers and the ion-conducting environment of living organisms. Electrodes form this interface.
Some of the several kinds of electrodes are better than others … Read More
What is a Biosensor?
This is a biological sensor that has the following features:
- A biological recognition component (selectivity).
- A supporting structure in intimate contact with a biological component.
Biosensors are typically miniature and include monitoring of blood gas and biochemical concentrations additionally, physical … Read More
Types of EMG Electrodes Commonly Used in Medical Measurements
We have different types of biopotential electrodes that are used in recording electromyographic (EMG) signals from different muscles in the body.
The shape and size of the recorded EMG signals depend on the electrical property of these electrodes and the … Read More
ECG Electrodes
A typical flexible ECG electrode is composed of certain types of polymers or elastomers that are made electrically conductive by the addition of fine carbon or metal powder. These electrodes are available with pre-pasted AgCl gel for quick and easy … Read More
Features of Floating Type Biopotential Electrodes
One key source of motion artifact in biopotential electrodes is the disturbance of the double layer of charge at the electrode-electrolyte interface. Employing non-polarizable electrodes like Ag/AgCl electrode can greatly reduce this artifact but it still can be present, and … Read More
Biomedical Instrumentation Questions & Answers
Q1. What are the problems encountered in biomedical measurements?
The problems encountered in biomedical measurements are:
- Variability of variables – the measurements taken under fixed set of conditions at one time may not be the same under the same conditions
Bioelectric Potentials and Electrodes Questions & Answers
Q1. What do you understand by bioelectric potentials? List the different types of biopotentials.
Bioelectric potentials are ionic voltages produced when special types of cells perform electrochemical activities. These bioelectric potentials can be measured and the measurement results provide meaningful … Read More
Types of Bioelectrodes
Introduction
Bioelectric events have to be picked up from the surface of the body before they can be put to the amplifier for subsequent record or display. This is done by use of electrodes. The potentials produced at different points … Read More