Plextrode® U-Probe

The 16- and 24-channel U-Probes are now available with thinner probe diameters. The 16-channel U-Probe is now available with an outer diameter of 185 µm, and the 24-channel U-Probe is available with 210 µm outer diameter. These new U-Probes feature 15 um platinum/iridium electrode wire, which is best for resolving single units.

 

The U-Probe will still be available with 20 µm or 25 µm electrode wire. These thicker diameter electrode wire U-Probes are recommended for those interested in current source density analysis.

 

The 8-channel U-Probe is also still available. The 8-channel U-Probe is now configured with a fluid channel for drug delivery by default. The placement of this fluid capillary is user defined. These 8-channel U-Probes have an outer probe diameter of 230 µm.



The U-Probe is a customizable, robust, multi-use, multi-site linear electrode. Flexibility in the manufacturing process allows for different electrode site arrangements and spacing, as well as optional fluid delivery channels or fiber-optic stimulation lines intermixed within the recording sites.

The precise linear arrangement of the electrode sites enables current source density analysis of the field potential signals as recorded from laminar neural structures. The small electrode site diameter (15 µm - 20 µm) enables single unit recording.

  • Durable, multi-use, multi-site linear probe
  • Guaranteed for a minimum of 30 penetrations through properly prepared dura
  • 8, 16, or 24 electrode sites embedded in a stainless steel needle
  • 15 or 20 μm platinum/iridium electrode site diameter, HML insulated (polyimide), secured in medical-grade epoxy
  • User-defined, inter-electrode spacing (see Technical Specs for options)
  • Available in single, stereotrode, and tetrode configurations (50 μm electrode spacing within stereotrode or tetrode configurations)
  • Up to four optional glass capillary channels for fluid delivery
  • Probe diameter depends on number of recording sites and fluid channels (see table below)
  • Contact Plexon at info@plexon.com for information on fiber-optic stimulation lines

Electrode Configurations

 

 

 

 

 

8 Single electrodes
16 Single electrodes
24 Single electrodes
   
4 Stereotrodes
8 Stereotrodes
16 Stereotrodes
   
2 Tetrodes
4 Tetrodes
6 Tetrodes

 

With Fluid Channels

4 fluid channels,
single electrode configuration

4 fluid channels,
stereotrode configuration

4 fluid channels,
tetrode configuration

1 fluid channel,
8-channel probe with fluid channel - only has 7 active recording sites

 

Brain Slice Configuration

The U-Probe can be bent at a 45 degree angle to record from brain slices.

 

The U-Probe is handmade and very customizable. Please contact Plexon at info@plexoninc.com if you don't find the configuration or feature you need.

 

 

 

 

 

 

 

 

 

 

 

 

# of Recording Sites # of Fluid Channels Electrode Diameter (µm) Probe Diameter (µm)
8 1 20 230
16 0 15 185
16 1 15 360
16 2 15 420
24 0 15 210
24 1-2 15 420
24 3-4 15 500

* 16- and 24-channel U-Probes can also be configured with 20µm or 25µm electrode wire.

Feature Standard Spec (approximate lead-time 4 -6 week Optional Spec (approximate lead-time 7 - 9 week)
Channel Count 8, 16, or 24 recording sites  
Electrode Configuration Single Stereotrode or Tetrode
Electrode Configuration ~ 400 - 600 kOhms @ 1kHz  
Electrode Site Diameter 15μm
Inter-electrode Spacing 150 - 200μm 50, 100, 150, 200, 250, 300, 400 500μm
Electrode Spacing within a Stereotrode or Tetrode group 50μm  
Distance to First Electrode 500μm 200 - 5000μm
Tip Angle and Shape 30 degree angle, linear taper

(i) 20 - 60 degree angle, linear taper
(ii) rounded, hemispherical
Probe Length 100mm (30mm of reinforcement tube, 70mm of probe) 10 - 130mm
Reinforcement Tube Length 30mm >30mm
Reinforcement Tube Diameter 640μm  
Probe Diameter See Table above (probe diameter depends on number of channels)  
Fluid/Fiber Optic Channel Count 0, 1, 2, 3, 4  
Fluid/Fiber Optic Channel Location At midway point of exposed electrode sites Any location
Fluid Channel Diameter 40μm glass capilary
  
Connector interface

8-channel: 10-pin Omnetics (0.050" pitch) connector< br>16-channel: 20-pin Omnetics (0.050" pitch) connector
24-channel: 36-pin nano Omnetics (0.025" pitch) connector
(see pin-out specifications in Related Documents tab under Documentation)
Bend Angle in Brain Slice 45 degree angle, 20mm from tip User defined

 

 

 

 Tip Angle

 

Janus probe


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