Concentric Electrodes

Concentric Electrodes

Concentric bipolar 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 without the outer Polyimide insulation. A comparison of the concentric electrodes is at the bottom of the page.

Concentric electrodes with outer polyimide insulation

ConcentricElectrodesConcentricElectrodesTip

 

Concentric electrodes without insulation

ConcentricElectrodes without InsulationConcentricElectrodes_woInsulationTip

This figure shows an insulated metal conductor with an exposed concentric surface.

3 Items

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3 Items

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Concentric Electrodes* Comparison Chart

Tungsten

Item  Metal Core   Length  Impedance Probe Outer
Diameter (total)
Tip
Diameter 
Core 
Diameter
Y dim X dim. 
w/polyimide
TM33CCNON   Tungsten 3” (76) 10-15K 0.013” uninsulated (325µm) 3-4µm .003” (76µm) 0.4 mm .005” (127µm)
TM33CCINS  Tungsten  3” (76) 10-15K  0.016” insulated (400µm) 3-4µm .003” (76µm) 0.4 mm .005” (127µm)
TM33CCINS-B Tungsten 3" (76) 10-15K 0.016" insulated (400µm)  3-4µm Blunt  .003" (76µm) 0.4 mm  .005" (127µm) 
TM53CCINS     Tungsten  5” (127)  10-15K  0.018” insulated (450µm)  3-4µm  .005” (127µm)  0.4 mm

.008” (203µm)

 *All have a stainless steel outer shaft.

 

Pt/Ir and Pt/IR NS fine

Item  Metal Core   Length  Impedance Probe Outer
Diameter (total)
Tip
Diameter 
Core 
Diameter
Y dim X dim. 
w/polyimide
PTM23CC001NON   Pt/Ir  2” (51) 10K  0.020” uninsulated (525µm) 3-4µm  0.01” (254µm) 0.4 mm .014” (356µm)
PTM23CC02INS   Pt/Ir  2” (51) 10K  0.020” insulated (525µm) 3-4µm 0.01” (254µm) 0.4 mm .014” (356µm)
PTM3CC02INS    Pt/Ir NS fine  3” (76)  200K  0.013” insulated (325µm) 2-4µm    0.002” (50.8µm) .25 mm .004” (114µm) 
 *All have a stainless steel outer shaft.

 

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