Small Animal Stereotaxic Instrument


The small animal stereotactic instrument SASI, originally designed by Thomas RECORDING in 1998, presents an exiting stereotactic manipulator for precise stereotactic procedures on small animals.  The SASI is a versatile, easy-to-use instrument that facilitates proper alignment of small animals for the stereotaxic placement of electrodes, micropipettes, cannula and other devices.

Key features:

  • Small size- lightweights and low price
  • High precision & quality "Made in GERMANY" by Thomas RECORDING
  • Available for all Thomas RECORDING microdrives (Micro-, Mini– and Eckhorn Matrix Systems)
  • Available with Thomas RECORDING low cost manual electrode drives
  • Head holders for different animals available (e.g. rat, mouse, etc.)
  • Custom-made adaptations for a wide range of animals and applications on request
  • Modular accessories allow for expansion of instrument capabilities
Number of degrees of freedom: 6
XYZ-Manipulator X,Y,Z adjustment: Metric scale, x=-10…+10 mm, y=-10…+10mm, z=0…30mm travel, calibrated 0.05 mm vernier scale.
Angle adjustment: Xyz manipulator is moving on a round arch. Continuous angel adjustment of xyz manipulator position: angle settings from -40°…+ 40°.
Rotation adjustment: Microdrive od electrode holder coupled to the xyz manipulator can be rotated up to 360°.

The stereotaxic frame is mounted to a base plate and is elevated to bring ear bars up to the required heigth.

Rat and mouse adaptor features offer various stereotaxic adjustments.


The major kinematic difference of the SASI in contrast to other stereotaxic instruments presently available on the market is, that in the SASI system all translational joints kinematically follow the rotational joints. This is realized by a curved guide (round arch) first introduced in animal stereotaxic instruments by Thomas RECORDING.

Technical sketch of Small Animal Stereotactic Instrument (SASI) with components

Figure 1: SASI components

Technical sketch of Small Animal Stereotactic Instrument (SASI) with degrees of freedom

Figure 2: SASI degrees of freedom

Selected publications

[2] Bryant J. L., Roy S., Heck D. H. A technique for stereotaxic recordings of neuronal activity in awake, head restrained mice. J Neurosci Methods (2009), March 30; 178(1): 75-79, DOI: 10.1016/j.jneumeth.2008.11.014

[1] Ramrath L, Hofmann UG, Schweikard A Spherical Assistant for Stereotactic Surgery Porceedings of the 2007 IEEE/RSJ International Conference on Intelligent Robots and Systems, San Diego (USA), Oct 29 - Nov 2, 2007

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