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electrophysiology
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April 26, 2013
Isolated Stimulation and Stimulus Isolators
The term stimulation refers to the delivery of energy of some kind to a biological tissue in order to elicit an observable response.
Although the energy used in stimulation may be chemical, thermal, mechanical or electrical, this discussion will focus on electrical stimulation. Electrical stimulation of biological tissues involves the delivery of current and voltage to the stimulation site. The two quantities are related by Ohm's law:
V=IR
Where V is the applied voltage, I is the current and R is the electrical resistance of the tissue and or the stimulating electrodes. This simple equation shows that if voltage is constant, current flow will diminish if the tissue/electrode resistance goes up, and will increase if the resistance decreases.
More commonly, the resistance of tissue differs from sample to sample, and the resistance...more
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April 26, 2013
WPI offers an array of metal microelectrodes. In this guide, we will look at introductory assortments, concentric electrodes, profile A, profile B and profile C electrodes. For basic information on these types of metal electrodes, see the Metal Microelectrode Basics page. Links to these related posts appear below this article.
Eligoy Steel is a *Cobalt/chromium/nickel alloy.
Deciphering Part Numbers
With few exceptions, the WPI metal electrodes conform to a part number standard depicted below. For the part number shown, you can determine that:- Metal - The electrode is made of platinum iridium. (See the metal codes below.)
- Length in inches - It is 2" long.
- Coating Thickness in microns - It has a 3µm coating.
- Core shaft diameter in millimeters - "B" electrodes with Kapton coating are 0.356mm.(See the core shaft...more
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April 26, 2013
Superior microelectrodes for outstanding extracellular recording — tungsten, iridium, platinum-iridium, and Elgiloy®
Types of Metal Electrodes
WPI offers a large variety of metal electrodes and they come in three basic styles (profiles). The selection guide that follows references the three electrode profiles. In addition, concentric bipolar electrodes are also discussed, as well as some of the options offered for the metal electrodes.
NOTE: The electrode diagrams below are not shown to scale.
Profile A
...more
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