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Thomas RECORDING offers a combination of a 4 core quartz glass insulated platinum/tungsten tetrode fiber (OD=100µm) and an optical fiber (OD=120µm) in a parallel arrangement like shown in figure 1.

The Thomas Optetrode combines the outstanding recording performance of Thomas tetrodes with the globular light distribution of Thomas optical fibers.

Key features:
  • Material: Quartz glass insulated Platinum/Tungsten tetrode fiber combined with a glass fiber
  • Outer electrode shaft diameter 100µm (tetrode fiber)
  • Outer glass fiber diameter 120µm
  • Unique material combination
  • Biocompatible materials
  • Very thin shafts minimize tissue damage
  • Different electrode tissue impe-dance values available for recor-ding multi unit, single unit activi-ty or local field potentials
  • Optetrodes Image1
Technical Data
Material:Quarz-glass insulated Platinum/Tungsten fiber (Tetrode) or glass fiber
Dimensions:Outer diameter 100µm (tetrode fiber) or 120µm (glass fiber)
 The lenght can be specified by customer, feel free to ask us for your individual design
Available fiber tip (tetrode and optical fiber):Tip shape A or tip shape D
 The Optetrode is strenghtened with a stainless steel tube.


Mechler et al. reported recently, that tetrodes of nonplanar contact configuration (such as the conical Thomas tetrodes), unlike some other single-cell recording probes (e.g., linear or some planar arrays), have full spherical sensitivity and thus offer spatially unconstrained data [for detaisl see 1, 2]. The Thomas optical fiber offers a globular light distribution which is optimal for the activation of light sensitive neurons in the recording sphere of the Thomas tetrode.   

The Thomas Optetrode can be adapted to the special requirements of our customers. Details are shown in the optetrode product brochure below. If you should have any further question please do not hesitate to contact us!

Figure 1: Thomas Optetrode consisting of a Thomas tetrode and a Thomas optical fiber.


[3] Hogri, R., Teuchmann, H. L., Heinke, B., Holzinger, R., Trofimova, L., & Sandkühler, J. (2022). GABAergic CaMKIIα+ Amygdala Output Attenuates Pain and Modulates Emotional-Motivational Behavior via Parabrachial Inhibition. J. Neurosci., 42(27), 5373–5388. doi: 10.1523/JNEUROSCI.2067-21.2022

[2] F. Mechler, J. D. Victor, I. E. Ohiorhenuan, A. Schmid, H. Quin, “Three-dimensional localization of neurons in cortical tetrode recordings”,  2011, Ch. 2.

[1] F. Mechler, J. D. Victor, “Dipole characterization of single neurons from their extracellular action potentials”,  2011, Ch. DOI 10.1007/s10827-011-0341-0.

Questions? Please don’t hesitate contacting us!

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