MWA (Micro Wire Array) Design Document (384)

Material: (Check one)

Platinum Iridium (H-ML coating)
Stainless Steel (Teflon Coating)

Wire Diameter: (Check one)

50 Micrpm (Typical)
25 micron

Number of recording wires (4-64):

(Must be even number)

Include a Reference Wire? (Check one)

Yes(Typical)- same material as recording wire with 2 mm exposed
No

Include a Ground connection? (Check one)

Yes - 20mm wire which will extend out from the connector
  • Silver (Typical)
  • Stainless Steel
No

Tip Exposure Method: Wire Cutoff

Impedance runge for each wire

25 micron pt/lr - 0.4 to 0.8 MQ

50 micron pt/lr - 0.2 to 0.4 MQ

25 micron SS - 0.6 to 0.9 MQ

50 micron SS - 0.4 to 0.6 MQ

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.

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

Physical Measurements

Epoxy Length E below connector: (Check one)

5mm ( typical)
Other

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

5mm ( typical)
Other (upto 23mm)

Length of wire beyond Carbo wax(L) (Check one)

2mm (typical)
Other (Upto 10 mm)

Include an Epoxy Blob? (Check one)

No (Typical)
Yes - Specify Distance from wire tip (D) mm

Array Layout and Channel connections

Looking from the top through the connector, fill out how you would like the electodes, including the refrance 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 layou

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): (Check one)

0.25mm (Typical)
0.5mm
0.75mm
1.0mm

Distance between Rows (BR): (Check one)

0.5mm (Typical)
0.25mm