S-Probes* are the newest tip design for Plexon neural probes. They are also the strongest. The entire tip is solid stainless steel and shaped similar to a sharpened pencil. It is not recommended to use any Plexon neural probe to puncture dura, however, those customers who must use the probe to puncture dura may have the best success using the S-Probe tip.
Flexibility in the manufacturing process allows for different electrode site arrangements and spacing, as well as optional fluid delivery channels for precise drug delivery or fiber optic lines for optogenetic stimulation 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 platinum/iridium electrode recording sites are available in 15, 20, 25 and 40µm diameter options. The small electrode site diameter (15µm) enables effective single-unit recording, while a unique etching process of the electrode surface results in lowered impedances without significantly changing the overall surface area of the exposed recording site. The result is a small site suitable for resolving single units coupled with low impedance for a better signal-to-noise ratio.
S-Probes are conveniently available in single, stereotrode and tetrode configurations, each with a choice of 8, 16, 24, 32, or 64* channels.
Below are all three 16 channel configurations illustrated with four fluid capillaries or optic fibers:
*64 Channel probes are available in single and stereotrode configuration.