MEA (Micro Electrode Array) Design Document (385)
Material

Platinum Iridium (Parylene C Coating)

Electrode Shank Diameter

75 Micron (Typical)
125 Micron
250 Micron

Number of recording Electrodes (4-128)

(Even Number only)

Recording Electrodes Impedance

(100KΩ-3000KΩ)

Recording Electrodes Tip Shape

Standard (Typical)
Blunt
Heated (Not recommended for Implantation)

Include a Reference Electrode?

Yes (Typical) - Same material as Electrode with 25Kohm Impedance
No
Other

Include a Ground connection?

Yes (Typical) – 20mm Silver wire which will extend out from the connector
Yes- Same material as Electrode with no insulation (Make sure you include in the electrode layout as this will be treated like an electrode)
No
Other

Include Polyamide tubing on Recording, Ref, and GND Electrodes?

No (Typical)
Yes (Recommended only when electrodes are long)

Connector/s

A11365-001 (Male Omnetics connector- 8 channel 10-pin 0.050” pitch)
A12623-001 (Male Omnetics connector- 8 channel, 10-pin, 0.050” pitch with latching mechanism)
A8393-001 (Male Omnetics connector- 8 channel, 10-pin, 0.025” pitch, 2 guide posts.)
A79014-001 (NPD-18-DD-GS, Male Omnetics connector- 16 channel, 18-pin, 0.025” pitch, 6 guides posts.)
A70242-001 (Male Omnetics connector- 16 channel, 18-pin, 0.025” pitch, 6 guides posts, Nickel free, MRI compatible.)
A79038-001 (NPD-18-DDGS, Male Omnetics connector- 16 channel 18-pin, 0.025” pitch.)
A79022-001 (Male Omnetics connector -32 channel, 36-pin, 0.025” pitch, 4 guide posts.)
A72312-001 (Male Omnetics connector -32 channel, 36-pin, 0.025” pitch, 4 guide posts Nickel free, MRI compatible.)

Other
Connector:
Recording Channel Pinout: (Insert Drawing here)

Note:
When Ground is a silver wire and not an electrode, the silver wire will extend from the connector, out of the epoxy. Silver wire should not be inserted into the brain, as it is toxic. It should rather be connected to a screw on the skull. screw on the skull.


Physical Measurements

Epoxy Length E below connector

10mm (typical)
Other (3mm to 15mm)

Length of Electrode beyond Epoxy (L)

5mm (typical)
Other (2mm to 30mm)

Array Layout and Channel connections
Custom Layout

Fill out how you would like the electrodes, including the reference and ground electrodes to be laid out using E1-En, and Ref. Supply a separate document if necessary. If an electrode, versus a silver wire, is used for ground, please also place it on the layout.

Note:
Please try to have as little as possible cross over wires or electrodes at the connector side, for example keep the Ref on the left side, and with E1 and E16 on the left side of the layout. See example below.
Array Layout and Channel connections Example

Below is an example of a 16-channel layout assignment:

Distance between Electrodes (BE)

Specify:(0.1mm to 1mm). mm

Distance between Rows (BR)

0.35 mm (Typical)
Other (0.1mm to 1.00mm)

Upload Custom Design
DEVELOPED BY: CBSOFT TECH