MEA (Micro Electrode Array) Design Document (385)

Material: (Check one)

Platinum Iridium (H-ML coating)
Tungsten (Parylene C Coating)

Electrode Shank Diameter: (Check one)

75 Micron (Typical)
125 Micron
250 Micron

Number of recording Electrodes (4-64):

(Must be even number)

Recording Electrodes Impedance:

(KΩ _(100KΩ-3000KΩ))

Recording Electrodes Tip Shape: (Check one)

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

Include a Reference Electrode? (Check one)

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

Include a Ground connection? (Check one)

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

Include Polyamide tubing on Recording, Ref, and GND Electrodes? (Check one)

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

Connector/s:

Standard - 36-pin (Good for upto 32 channels)
Standard-18-pin Male Omnetics Connector (A8141-001).Recording Channel Pinout for each connector is as follows:(Top Veiw of the array)
Standard - 10-pin (0.050” pitch) Male Omnetics connector (A11365-001) for 4 to 10 contact sites only.

Notes:

1. For more than 16chan arrays, the scheme would be the same for each 16
channels, so E1-E16 will be replaced with E17-E32, E33-E48, and E49-
E64.

2. 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.

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

Physical Measurements

Epoxy Length E below connector: (Check one)

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

Length of Electrode beyond Epoxy (L): (Check one)

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

Array Layout and Channel connections

Looking from the top through the connector, 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.

Distance between Electrodes (BE):

Specify:(0.1mm to 1mm))

Distance between Rows (BR): (Check one)

0.35 mm (Typical)
Other:

Array Layout and Channel connections Example

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