Concentric electrodes are designed for bipolar electrical stimulation and/or macroscopical recordings (large number of neurons or nerves). These probes can incorporate fiber optics and/or drug delivery cannula for precise optogenetic stimulation and local drug administration. We offer our electrodes in various designs for acute and long-term (chronic) applications, for instance:
Concentric Electrodes - CE
CE-Acute-Insulated-SharpTip
This design is ideal for precise bipolar stimulation (evoked activity or evoked potential studies) in acute experiments. The core electrode (Platinum/Iridium or Stainless Steel) is sharpened to facilitate dura penetration and precise, localized stimulation of the tissue. We use polyimide tubing for insulating the outer Stainless Steel tube, which exposed part forms the other contact. Epoxy insulation separates the two metal contacts. The macroscopic tip has a tapering profile. Two gold male pin connectors provide easy connection to your data acquisition system.
Concentric electrodes are designed for bipolar electrical stimulation and/or macroscopical recordings (large number of neurons or nerves). These probes can incorporate fiber optics and/or drug delivery cannula for precise optogenetic stimulation and local drug administration. We offer our electrodes in various designs for acute and long-term (chronic) applications:
CE-Acute-Insulated-SharpTip
This design is ideal for precise bipolar stimulation (evoked activity or evoked potential studies) in acute experiments. The core electrode (Platinum/Iridium or Stainless Steel) is sharpened to facilitate dura penetration and precise, localized stimulation of the tissue. We use polyimide tubing for insulating the outer Stainless Steel tube, which exposed part forms the other contact. Epoxy insulation separates the two metal contacts. The macroscopic tip has a tapering profile. Two gold male pin connectors provide easy connection to your data acquisition system.
CE-Chronic-Insulated-SharpTip
This design is ideal for precise bipolar stimulation (evoked activity or evoked potential studies) in chronic experiments. The core electrode (Platinum/Iridium or Stainless Steel) is sharpened to facilitate dura penetration and precise, localized stimulation of the tissue. We use polyimide tubing for insulating the outer Stainless Steel tube, which exposed part forms the other contact. Epoxy insulation separates the two metal contacts. The macroscopic tip has a tapering profile. An epoxy blob, placed approximately 10mm away from the sharp electrode tip helps the chronic implantation. A Stainless Steel reinforcement rod, which helps in precise implantation and which might be cut off post implantation, is attached to the probe. Two gold male pin connectors provide easy connection to your data acquisition system.
It may also be possible to produce these probes beyond the listed parameters to facilitate the most ideal setup for your research needs.
- Neurological recording and stimulation
- Acute and chronic recordings in small to large animals
- Moderately customizable design
- Capillary and fiber options
- Dura puncture with the sharpened tip profile
- Various connector options (gold pins as default)
GENERAL
| Ideal method of use | Acute and chronic |
| Application method | In vivo and in vitro |
| Research phase | Pre-clinical |
| Subject | Small-, mid- and large-sized animals, such as rodents, primates or brain slices |
| Shape | Symmetric |
| Linear | – |
| Steretrode | – |
| Tetrode | – |
| Spacing if stereotrode or tetrode (µm) | – |
TIP
| Angle (°) | 15, 30, 60 |
| Material | Epoxy, Platinum/Iridium (Stainless Steel) |
| Shape | Tapered |
SHAFT
| Material | Stainless Steel (with polyimide tubing) |
| Diameter (µm) | 250 (185 + gap (25) + polyimide thickness (2×20)) |
| Length (mm) | 75, 125 (SS core) and 50 (Pt/It core) |
| Ferromagnetic | Y (non-MRI compatible) |
ELECTRODE SITES
| Material | Platinum/Iridium or Stainless-Steel (core electrode) and Stainless Steel (macro electrode) |
| Diameter (µm) | 2-3 for Stainless Steel, 2-5 for Platinum/Iridium (core electrode) and 185 for Stainless Steel (macro electrode) |
| Length of exposed core (µm) | 200-300 (Stainless Steel) and 200-400 (Platinum/Iridium) |
| Inter-electrode spacing (µm) | – |
| Number of electrode channels | 2 |
| Tip to 1st site distance (µm) | – |
| Tip to epoxy blob distance (mm) | 10 |
CAPILLARY FLUID CHANNEL
| Applicable | Y |
| Material | Glass, Polyimide |
| Outer diameter (µm) | As per user’s request |
| Inner diameter (µm) | As per user’s request |
FIBRE OPTICS
| Applicable | Y |
| Diameter (µm) | 75, 125 |
REINFORCEMENT TUBE
| Applicable | Y |
| Diameter (µm) | As per user’s request |
| Length (mm) | As per user’s request (typical is 50) |
SILICONE DISK
| Silicone disk | N |
| Diameter (mm) | – |
| Thickness (mm) | – |
OTHER
| Connector types | Gold pins |
| Lifespan | Reusable |
| Silicone cable between connector and probe (mm) | Chronic only |
| Special notes | It is important to test the capillary and/or the fiber optics before the first use. Cleaning is also recommended after each use. |
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