Metal Electrodes
- - April 30, 2013
Profile B Microelectrodes
These electrodes are sold in packages of 10.
Tungsten Profile B Comparison Chart, 76 mm long, 0.216 mm shaft
Order code Length Insulation
ThicknessShaft
DiameterNominal
Impedance
±20%Tip
DiameterTypical Use TST33C05KT 76mm 3µm 0.216 mm 0.5 MΩ 1µ Stereotrode / Bipolar, differential measurements - extra fine TST33C10KT-B 76mm 3µm 0.216 mm 1.0 MΩ 1µ Stereotrode / Bipolar, differential measurements - extra fine. Blunt tip. TST33C10KTH 76mm 3µm 0.216 mm 1.0 MΩ 1µ Stereotrode / Bipolar, differential measurements - extra fine. Heat treated. TST33C20KT 76mm 3µm 0.216 mm 2.0 MΩ 1µ Stereotrode / Bipolar, differential measurements - extra fine Tungsten Profile B Comparison Chart, 76 mm long, 0.356 mm shaft
...moreOrder code Length Insulation
ThicknessShaft
DiameterNominal
Impedance
±20%Tip
DiameterTypical Use TST33A001KT 76mm 3µm 0.356 mm 0.01 MΩ 1µ Stereotrode / Bipolar, differential measurements TST33A05KT 76mm 3µm 0.356 mm 0.5 MΩ 1µ Stereotrode - - April 25, 2013
NOTE: A heat treated tip is ideal for penetrating tough membranes. (It is not recommended for chronic implantation.) This process is performed using a microforge in which the heating element is positioned in close proximity to the tip in order to melt the Parylene-C distal to the exposed metal. It provides a smooth transition and produces better adherence of the Parylene-C to the metal. Both the KT and non-KT electrodes are heat-treatable. The heat treatment is applied only to the parylene coating. The heat melts the parylene so it feathers down close to the shank near where the tip is exposed. This removes the abrupt edge where the parylene has been removed to create the tip exposure. The purpose is to prevent the parylene from delaminating from the electrode during implantation into tissue which could catch on the edge. Heat treatment does not work well in chronic applications, because the feather edge is susceptible to fluid intrusion overtime, which will alter the impedance characteristics...more
- - April 25, 2013
Profile A Metal Microelectrodes
Platinum Iridium
These electrodes are sold in packages of 10.
Order code Length Insulation
ThicknessShaft
DiameterNominal
Impedance
±20%Tip
DiameterTypical Use PTM23B05 51mm 3µ 0.254mm 0.5MΩ 1-2µ Single and multi unit recording, stimulation, chronic implants Tungsten
...more
Order codeLength Insulation
ThicknessShaft
DiameterNominal
Impedance
±20%Tip
DiameterTypical Use TM31A10 76mm 1µ 0.127 mm 1.0 MΩ 1µ Multi unit and single unit recording and microstimulation TM31A20 76mm 1µ 0.127 mm 2.0 MΩ 1µ Multi unit and single unit recording and microstimulation TM31A50 76mm 1µ 0.127 mm 5.0 MΩ 1µ Multi unit and single unit recording and microstimulation TM31C40 76mm 1µ 0.085 mm 4.0 MΩ 1µ Recording from small tightly packed cells TM33A05 76mm 3µ 0.127 mm 0.5 MΩ 1µ Multi unit and single unit recording and microstimulation TM33A10 76mm 3µ 0.127 mm 1.0 MΩ 1µ Multi unit and single unit recording and microstimulation TM33A20 - - April 25, 2013
Introductory Assortments
Each of these assortment kits includes electrodes with different impedance within each style. Use an assortment kit to determine which electrode you need for your experiment. Each box includes the electrodes listed. There are no mix and match assortment kits.
Profile A
Profile B
Profile C
Assortments Profile A Comparison Chart
Order code Metal Core Contains the following electrode impedances by quantity (pkg of 10) TM31/33Axx Tungsten TM33A05 (2), TM33A10 (3), TM33A20 (3), TM31A50 (2) Assortments Profile B Comparison Chart
Order code Metal Core Contains the following electrode impedances by quantity (pkg of 10) TST33AxKT Tungsten TST33A05KT (3), TST33A10KT (4), TST33A20KT (3) Assortments Profile C Comparison Chart
Order code Metal Core Contains the following electrode impedances by quantity (pkg of 10) TM53AxxKT Tungsten TM53A05KT (3), TM53A10KT (3), TM53A20KT (4) Concentric Electrodes*
...moreOrder code Metal Core Length Impedance Probe Outer
Diameter - - April 25, 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 diameter description below.) This code doesn't apply to Elgiloy stainless steel electrodes.
- Impedance at 1kHz, measured in 0.1MΩ - This electrode has 1.0MΩ nominal impedance...more
- - April 25, 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
Profile B
Profile C
Concentric Bipolar Electrodes
These electrodes are excellent for shielded macro recording, as well as evoked potentials. They are especially well suited for bipolar stimulation. The tungsten electrode is sharpened to a point and is 75μm in diameter. The outer stainless steel conductor is insulated with Polyimide tubing to within 0.2mm of the end of the stainless steel tube. This electrode is also available...more
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