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Biomedical Instrumentation Essay

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Recording Electrodes used in the Biomedical Instrumentation:
Recording electrodes are the devices that convert ionic potentials into electronic potentials. The type of electrodes used for the measurements depends on the anatomical location of the organ. Bio-electrodes are the sensors that convert ionic conduction into electronic conduction. The purpose of bio-electrodes is to acquire bioelectrical signals such as ECG, EMG, and EEG, etc.
Electrodes are mainly classified into two types [20]:
1. Perfectly polarized electrodes and
2. Perfectly non-polarized electrodes.
There are various electrodes that can be used to measure bioelectric signals. The three main classes of electrodes are Microelectrodes, Body Surface electrodes and Needle electrodes. …show more content…
These electrodes have generally smaller contact area. This type of electrodes has a tendency to lose their adhesive ability and therefore it causes errors in the result.
c) Floating electrodes:
These electrodes can eliminate the artifact errors which is a main problem with the plate electrodes. This is avoiding by making direct contact of the electrodes with the skin. So the main advantage of floating electrodes is mechanical reliable. The conductive path between the metal and the skin is the electrolyte paste or jelly.
d) Disposable electrodes:
Normally plate electrodes, floating electrodes etc can be used more than one time. But it requires more care while cleaning after each use. Thus uses of disposable electrodes are now very popular which can be disposed after the use.
e) Suction electrodes:
These electrodes are well suited for the attachment of flat surfaces of body and the regions where the underlying tissues are soft. These electrodes have a small surface area. These types of electrodes are mainly used for the measurement of ECG. Suction electrodes are shown in Fig. 1.1.3. It is used a plastic syringe barrel to house suction tubing and input cables to an AC

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