The Thomas Heptode Mini Matrix (HMM) is a software controlled motorized microdrive with patented driving principle and up to 32 recording channels. The Heptode Mini Matrix moves up to 4 heptodes (7 channel fiber microelectrode, outer diameter 100µm) and 1 tetrode (4 channel fiber microelectrode, outer diameter 100µm) independently from each other to different depths of the brain. With a travel distance of up to 24mm (larger travel distances on request) this allows cortical as well as deep brain recordings. One can replace a tetrode or heptode by an injection pipette, an optical fiber or an electrical stimulation electrode and move it like the heptodes/tetrodes, computer controlled into the brain.

Product Description

Key Features

• 5 micromotors move 5 probes independently from each other

• Electrode travel distance: up to 24mm

• Up to 32 recording channels

• Axial resolution better than 1µm

• Recording with up to 32 recording channels

• Electrical stimulation with IrOx coated fiber stimulation electrodes

• Microinjection with fiber (metal or glass) injection cannulas

• Optical stimulation with optical fibers

• Axial resolution better than 1µm

• High precision & quality “Made in GERMANY” by Thomas RECORDING

• Variable speed range 0…250µm/s, higher velocity on request

• Custom-made solutions for each recording application for NHP or rodents

• Networkable motor control unit (LAN communication via TCP/IP)

• Xyz manipulator for reproducible recording position

• Integrated motor control and data acquisition-software

• Adapted to intan Technologies data acquisition system (RHD and RHS)

Microdrive Components

The Heptode Mini Matrix is available for research applications with rodents or non-human primates. The Microdrive allows to move up to five fibers (single electrodes, tetrodes, heptodes, optical fibers, injection cannulas, stimulation electrodes) independently from each other to different depths of the brain. The electrode travel distance is up to 24.000µm. A 32-channel low-noise preamplifier is integrated in the microdrive chassis. As the chassis is made of anodized aluminum it is working like a Faraday cage, shielding the recording electrodes from electrical interference. The Microdrive can be easily adapted to different stereotaxic setups e.g., for rodents and non-human primates. The microdrive head is exchangeable to realize different electrode arrangements (e.g. linear, concentric) with different electrode spacing (e.g. 80µm, 300µm, etc.). The used fiber microelectrodes have outer diameters of 80-100µm, causing only minimal tissue damage when introduced in the recording target. In histological preparation one can hardly see the electrodes trajectories!

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