Tungsten Metal Micro Electrodes

Tungsten Metal Micro Electrodes

These Metal Micro Electrodes are ideal for a multitude of applications including single- and multi-unit studies, stimulation, lesioning, and evoked response studies. Four metals are available depending on the application.

Item# Description U.S. List Price Quantity
72-0375 Tungsten Metal Micro Electrode, Stereotrode/Bipolar, 127 mm (5 in) long, Tip Impedance 1 MΩ, pkg. of 10
72-0376 Tungsten Metal Micro Electrode, Stereotrode/Bipolar, 127 mm (5 in) long, Tip Impedance 1.5 MΩ, pkg of 10
72-0377 Tungsten Metal Micro Electrode, Stereotrode/Bipolar, 127 mm (5 in) long, Tip Impedance 0.5 MΩ, pkg. of 10
72-0378 Tungsten Metal Micro Electrode, Additional Polymide, 127 mm (5 in) long, Tip Impedance 2 MΩ, pkg. of 10
72-0379 Tungsten Metal Micro Electrode, Additional Polymide, 127 mm (5 in) long, Tip Impedance 1 MΩ, pkg. of 10
72-0384 Tungsten Metal Micro Electrode, Parylene Coated, 127 mm (5 in) long, Tip Impedance 1 MΩ, General Tip, pkg. of 10
72-0386 Tungsten Metal Micro Electrode, Parylene Coated, 127 mm (5 in) long, Tip Impedance 0.5 MΩ, Bullet Tip, pkg. of 10
72-0390 Tungsten Metal Micro Electrode, Stereotrode/Bipolar, 76 mm (3 in) long, Tip Impedance 0.5 MΩ, pkg. of 10
72-0392 Tungsten Metal Micro Electrode, Additional Polymide, 76 mm (3 in) long, Tip Impedance 1 MΩ, pkg. of 10
72-0393 Tungsten Metal Micro Electrode, Additional Polymide, 76 mm (3 in) long, Tip Impedance 5 MΩ, pkg. of 10
72-0394 Tungsten Metal Micro Electrode, Parylene Coated, 76 mm (3 in) long, Tip Impedance 2 MΩ, Shaft diameter 254 µm, pkg. of 10
72-0395 Tungsten Metal Micro Electrode, Parylene Coated, 76 mm (3 in) long, Tip Impedance 2 MΩ, Shaft diameter 127 µm, pkg. of 10
72-0396 Tungsten Metal Micro Electrode, Parylene Coated, 76 mm (3 in) long, Tip Impedance 1.5 MΩ, Shaft diameter 127 µm, pkg. of 10
72-0397 Tungsten Metal Micro Electrode, Parylene Coated, 76 mm (3 in) long, Tip Impedance 1 MΩ, Shaft diameter 254 µm, pkg. of 10
72-0398 Tungsten Metal Micro Electrode, Parylene Coated, 76 mm (3 in) long, Tip Impedance 1 MΩ, Shaft diameter 127 µm, pkg. of 10
72-0399 Tungsten Metal Micro Electrode, Parylene Coated, 76 mm (3 in) long, Tip Impedance 0.5 MΩ, Shaft diameter 254 µm, pkg. of 10
72-0400 Tungsten Metal Micro Electrode, Parylene Coated, 76 mm (3 in) long, Tip Impedance 0.5 MΩ, Shaft diameter 127 µm, pkg. of 10
72-0401 Tungsten Metal Micro Electrode, Parylene Coated, 76 mm (3 in) long, Tip Impedance 0.1 MΩ, Shaft diameter 254 µm, pkg. of 10
72-0402 Tungsten Metal Micro Electrode, Parylene Coated, 76 mm (3 in) long, Tip Impedance 5 MΩ, Extra Fine Tip, pkg. of 10
72-0403 Tungsten Metal Micro Electrode, Parylene Coated, 76 mm (3 in) long, Tip Impedance 2 MΩ, Extra Fine Tip, pkg. of 10
72-0404 Tungsten Metal Micro Electrode, Parylene Coated, 76 mm (3 in) long, Tip Impedance 1 MΩ, Extra Fine Tip, pkg. of 10
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• Outstanding for extracellular recording and micro-stimulation
• Unique, precision manufacturing process provides consistent repeatable tip profiles for superior performance
• Select from 4 metals, 3 styles, and 4 tip profiles to meet almost any application
• Gold-plated connector pins for superior electrical connections
• Custom made probes readily available

These Metal Micro Electrodes are ideal for a multitude of applications including single- and multi-unit studies, stimulation, lesioning, and evoked response studies. Four metals are available depending on the application:
• Tungsten
• Stainless Steel (Elgiloy metal)
• Platinum/Iridium Mix (80/20%)
• Pure Iridium

Tungsten is the most versatile and widely used type of probe. It is ideal for demanding recording situations and most stimulation protocols.

The Stainless Steel (Elgiloy) Electrodes are widely used as the primary component for the ‘vibrating probe’ electrode. It is vibrated at a fairly high frequency and is used to record very small DC potentials. It is also use for Prussian blue staining around the tip by passing a small anodal current.

The Platinum/Iridium mix Electrodes have a lower concomitant impedance value than tungsten or stainless steel for the same exposure, therefore they are ideal for recording. They are also superior for stimulation studies because they are less likely to erode during intense stimulation protocols. This metal mixture is also excellent for chronic implants because it is very biocompatible.

The Pure Iridium Electrodes are ideal for improved stimulation and recording. Pure Iridium is extremely stiff and has a much lower concomitant tip impedance than any other noble metal. It is extremely inert and very resistant to corrosion. Consequently, it is much less likely to erode during stimulation and can be activated using cyclic voltametery for increased charge storage capacity to lower tip impedance values.

Three Electrode Styles are Available:

• Standard style with 3 mm or 1 mm of Parylene-C insulation on the metal shaft.
• Standard style with the addition of polymide tubing on the shaft which provides additional reinforcement for easy electrode insertion. The additional insulation also minimizes signal attenuation making this an ideal electrode for deep brain penetrations.
• Stereotrode/Biopolar style for micro bipolar stimulation. These Electrodes are ideal where the current injection needs to be confined to a small, localized part of the nervous system. They are also used for enhanced isolation of single neural elements by simultaneously recording from multiple units of two closely spaced microelectrodes.

All of the Microelectrodes are sharpened electrochemically and their tips are individually exposed under a microscope. Each is inspected to assure reproducible tip exposures and profile. Four different tip profiles are created using a unique process to remove the insulation from the electrode tip:

• General Profile with a 25:1 taper ending in a sharp point which is good for most applications.
• Heat Tapered Profile with a 25:1 taper ending in a sharp point with “toughened” Parylene-C near the exposed tip providing more rigidity. This tip is ideal for penetrating tough tissues.
• Extra Fine Profile with a 50:1 taper ending in a sharp point which is good for small cells and near surface work. This profile only has 1 mm of Parylene-C insulation on the metal shaft.
• Bullet Profile with a 25:1 taper ending in a rounded point which is ideal for stimulation due to reduced neuron penetration.

These Electrodes are supplied in a box of 10.

Specifications72-037572-037672-037772-037872-037972-038472-038672-039072-039272-039372-039472-039572-039672-039772-039872-039972-040072-040172-040272-040372-0404
Electrode StyleStereotrode/BipolarStereotrode/BipolarStereotrode/BipolarAdditional PolymideAdditional PolymideParylene CoatedParylene CoatedStereotrode/BiopolarAdditional PolymideAdditional PolymideParylene CoatedParylene CoatedParylene CoatedParylene CoatedParylene CoatedParylene CoatedParylene CoatedParylene CoatedParylene CoatedParylene CoatedParylene Coated
Insulation Thickness3 3 3 3 3 3 3 3 3 1 3 3 3 3 3 3 3 3 1 1 1
Length (English)5 in5 in5 in5 in5 in5 in5 in3 in3 in3 in3 in3 in3 in3 in3 in3 in3 in3 in3 in3 in3 in
Length (Metric)127 mm127 mm127 mm127 mm127 mm127 mm127 mm76 mm76 mm76 mm76 mm76 mm76 mm76 mm76 mm76 mm76 mm76 mm76 mm76 mm76 mm
Shaft Diameter127 127 127 127 127 127 127 127 127 127 127 127 127 254 127 254 127 254 127 127 127
Tip Impedance1 M ohms1.5 M ohms0.5 M ohms2 M ohms1 M ohms1 M ohms0.5 M ohms0.5 M ohms1 M ohms5 M ohms2 M ohms2 M ohms1.5 M ohms1 M ohms1 M ohms0.5 M ohms0.5 M ohms0.1 M?5 M ohms2 M ohms1 M ohms
Tip ProfileGeneralGeneralGeneralGeneralGeneralGeneralBulletGeneralGeneralX-FineGeneralGeneralGeneralGeneralGeneralGeneralGeneralGeneralX-FineX-FineX-Fine
Type of MetalTungstenTungstenTungstenTungstenTungstenTungstenTungstenTungstenTungstenTungstenTungstenTungstenTungstenTungstenTungstenTungstenTungstenTungstenTungstenTungstenTungsten