Metal Microelectrodes EXPOSED TIP DIMENSIONS Nominal Impedance 10 kΩ 50 kΩ 0.1 MΩ 0.5 MΩ 1.0 MΩ 2.0 MΩ 5.0 MegΩ (nominal) Tungsten 250 µ 200 µ 100 µ 55 µ 30 µ 12 µ 5µ Elgiloy ___ ___ 120 µ 66 µ 36 µ 15 µ 6µ Platinum Iridium ___ ___ 60 µ 18 µ 10 µ 6µ 3µ Pure Iridium ___ ___ 45 µ 14 µ 10 µ 5µ 2.5 µ Superior microelectrodes for outstanding extracellular recording — tungsten, iridium, platinum-iridium, and Elgiloy® Metal Exposed tip 25:1 taper Parylene-C* Kapton* tubing, indicated by “KT” in the part number, extends from the connector to within 5 mm of the tip, providing stiffness and additional insulation to the electrode shaft. Kapton-clad electrodes are recommended when the electrode is to be inserted through a cannula for extra deep penetration. & ELECTRODES Gold-plated connector pin Parylene coating 2-, 3-, 5-inch lengths Gold-plated connector pins Shrink tubing Polyimide tubing 0.014" O.D. for 0.005" O.D. WE Glue Parylene-C Insulation Exposed tips Type A Note: Electrode diagrams not shown to scale. 3" and 5" total length 5 mm typical Tip separation 90 or 125µm ±15% Type B Gold-plated connector pin Parylene coating Polyimide Tubing 2-, 3-, 5-inch lengths Type C core conductor exposed stainless steel surface stainless steel tubing Polyimide tubing Concentric Bipolar Electrodes Excellent for shielded macro recording as well as evoked potentials — especially well suited for bipolar stimulation The tungsten electrode is sharpened to a point and is 75 microns in diameter. The outer stainless steel conductor is insulated with Polyimide tubing to within 0.2 mm of the end of the stainless steel tube. Also available without the outer Polyimide insulation. x shrink tubing L=3" or 5" (2" for PTM) W Y <0.4 mm Y GLASS, HOLDERS Insulated metal conductor with exposed concentric surface .389" (9.88 mm) .031" (0.79 mm) pin #5482 .404" (10.26 mm) Heat Treated Tip (above) is ideal for penetrating tough membranes (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. To have your electrodes heat treated, just add the suffix “H” to any of the “KT” numbers on the facing page. Cost of the treatment is $10 per package of 10 electrodes ($20 per package for Type B). * Parylene is a trade mark of Union Carbide. Kapton is a trade mark of DuPont. Elgiloy is a trade mark of Elgiloy Ltd. Gold-plated pins (#5482) and sockets (#5483) may be attached to 24-, 26-, or 28-gauge wire. socket #5483 0.51 mm ID #5470 (mount in M3301EH holder, see page 200) Electrode plugged into adapter #5470 ACCESSORIES 300102 Micromanipulator holder, 4 in., 2mm to 0.031 socket 5468 2 mm receptacle to 0.031-inch jack (for Omega-TipZ) 5469 Adapts mini banana plug (DAM80) to 0.031-inch receptacle (metal microelectrode) 5470 0.031-inch jack, 28 ga. wire, 12 inch (pkg of 4) 5482* Pins, 0.031-inch, gold-plated (pkg of 50) 5483* Sockets, 0.031-inch gold-plated (pkg of 50) *Gold-plated pins (#5482) and sockets (#5483) may be attached to 24-, 26-, or 28-gauge wire. #5468 #300102 #5469 104 UK: Tel: +44 (0)1462 424700 • wpiuk@wpi-europe.com World Precision Instruments www.wpiinc.com Germany: Tel: +49 (0)30-6188845 • wpide@wpi-europe.com US: Tel: 941-371-1003 • sales@wpiinc.com