4-Channel Probes

NeuroNexus Qtrodes are low-cost 4-channel probes designed to replace tetrodes and/or wires in your lab. Qtrodes are also ideal for acute or chronic experiments requiring lower channel counts.

  • Predictable geometry – Obtain consistent recording results with precise, reproducible geometry and electrical characteristics from our silicon probes.
  • Optogenetics-compatible – Combine an acute or chronic Qtrode with an optical fiber to combine electrophysiology with optogenetic stimulation. Opto-Qtrodes use the “O” prefix designation, e.g. “OCQ4.”
  • Improved Chronic experiments – Combine a Qtrode with a microdrive for potentially better chronic experiment longevity and data yield.
  • Fast Delivery – Qtrodes are stocked for quick shipment and delivery. Please note there is a minimum order of 5 Qtrodes. (This applies to all models.)


Electrode Site Material Iridium (standard)
Electrode Thickness 15 µm or 50 µm
(varies by design)
Electrode Length 3, 5, 10 mm
(varies by design)
Site Layout Linear or Tetrode
Channel Count 4
Available Packages Acute, Chronic, Flex Cable (microdrive compatible)

Ordering Information

The Q4 package is designed for easy handling in acute applications.

The CQ4 and HQ4 packages are designed for chronic applications. The CQ4 is a miniaturized package for minimal weight and size, while the HQ4 package includes a flex cable to allow for connector standoff from the implant site.

Microdrive Compatibility
The HQ4 is compatible with the dDrive.

Qtrodes can be configured for both acute (OQ4) and chronic (OCQ4) Optogenetics applications.

Multiple Implant
The Electrode Interface Board (EIB) is part of a miniaturized system that allows multiple probe implants in one animal. The EIB interfaces with the Qtrode Interface Board (QIB) to connect to your recording system.

Headstage Connection
The acute Qtrode package uses edge card technology, while the chronic Qtrode package uses a miniature 5-pin connector. NeuroNexus recommends purchasing an appropriate adaptor with your Qtrode to match your headstage.

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