Dry electrodes
Medical Computer Systems
Dry electrodes
for EEG

OVERVIEW

EEG electrodes are produced in 2 types:

• Dry active electrode MCScap-DrA1

• Dry passive electrode MCScap-DrP1

MCScap-DrA1 is polyurethan hermetic body with PCB of amplifier and thin and durable cable. Amplifier use for converting high input impedance from dry sensor to low output impedance. This solution dramatically decreases moving cable noise and external interference to cable.

Dry EEG electrodes are intended for use with soft dry sensors SoftPulse™ produced by Datwyler.

Sensors SoftPulse™ can be in 3 types:

• Flat (for skin without hair)

• Medium with 5 mm long pins (more universal)

• Long with 8 mm long pins (for thick hair)

More information about sensors:

https://datwyler.com/technology-innovation/advanced-technologies/strategic-fields/wearables-digital-health/softpulse

Electrodes MCScap-DrA1 and MCScap-DrP1 can be preinstalled in MCScap DRY electrode cap with common connector.

Cap can have different quantity of electrodes and different types of connectors, according to requirements of EEG amplifier model and aims of application.

FAQ Get Quotation Documents
FAQ Get Quotation Documents

HOW IT WORKS?

Initially Dry electrodes work worse than liquid or solid gel electrodes.

This is due to the resistance of the electrode-skin, on which interference is emitted:

  • 5 - 60 kOhm for electrodes with liquid or solid gel,
  • 200 -1000 kOhm for dry electrodes.

Therefore, for dry passive electrodes is recommended to use wireless amplifiers with short elctrode cables (up to 30 cm), which is placed at patient head. For an acceptable result, the EEG is filtered, leaving the signal in a band of approximately 1 .. 30 Hz.

Active dry electrodes can work with long wires effectively. The builted amplifier into the electrode reduces the output impedance from the electrode and significantly attenuates the noise induced on the wires. But active electrodes are more complex, require additional power and are more expensive than conventional passive electrodes.

ASSEMBLY SCHEME

SPECIFICATION

Shape Flat Brush Medium Brush Long
Features Flat Brush 15 legs (5 mm L, 1 mm Ø) Brush 12 legs (8 mm L, 1.5 mm Ø)
The need to use an electrode contact substance not required not required not required
Total height 4.7 mm 9.5 mm 13.5 mm
Outer diameter 13 mm 13 mm 13 mm
Contact area 132.7 mm2 11.8 mm2 21.2 mm2

PHOTO