Slip rings for in vivo voltammetry and neurophysiology

Use of the low torque slip ring in the operant chamber

The Invilog low noise, low torque, low weight slip ring (also known as a swivel or a commutator) connects the head stage with measurement equipment. It can be attached to a unique multi-axis constant force lever which gently compensates for the weight of the head stage, and a cable and slip ring. The lever also allows you to use a shorter cable that catches and produces less noise.

The multi-axis lever/slip ring assembly follows the slightest move of the animal in any spot of the experimental area and permits artefact-free measurements.

Invilog manufactures two main types of slip rings – (a) without a bore (10 mm outer diameter) and (b) with a bore (22 mm outer diameter). The latter type is designed for customers who need to deliver liquid via tubing and light via optical fibres along with transferring electrical signals.

Miniature low torque slip ring
Slip ring with 5 mm bore
Slip ring with 5 mm bore

The Main Features and Benefits of Invilog Slip Rings:

  1. The slip ring is so small and light that it can be attached to a multi-axis constant force lever.
  2. Ball bearings and precision moving contacts make it a low noise and a low torsion instrument.
  3. An aluminum shell connected to ground serves as a Faraday shield.
  4. Up to 12 contact lines (including ground contact) and a 5 mm bore in the slip-ring with a bore provide plenty of possibilities for an experimental setup.
  5. Popular Plastics1 concentric threaded connectors allow for 6, 7, or 12 contacts on the stator and rotor ends.
  6. Custom connectors, bare wires, or low noise flexible cables can replace the concentric connectors for further in-lab modifications.

Current flows via the Invilog slip ring contacts during animal movement (left panel) and during immobility (right panel) with nearly similar levels of noise.

Current via Invilog slip ring during animal move
Current via Invilog slip ring during immobility