Portable electroencephalography devices
According to one aspect, the present description relates to a portable device ( 10 ) for acquiring electroencephalographic (EEG) signals emitted by a user. The portable device comprises a flexible support ( 11 ) intended to fit a localized region of the skull of the user and a set of sensors ( 13 ) of electrical signals generated by the neuronal activity of the user, arranged on said support ( 11 ) so as to form contacts with the scalp when the device is worn by the user. For each sensor, an electronic circuit for filtering and amplifying electrical signals detected by said sensor is incorporated in the flexible support ( 11 ) and forms, with said sensor, an active electrode. The portable device also comprises a housing ( 12 ) comprising an electronic system for processing signals from said electronic filtering and amplification circuits, said housing being linked mechanically to the flexible support to form, with said support, a means of attachment to a garment or accessory intended to be worn by the user.
1. A portable device for acquisition of electroencephalographic (EEG) signals emitted by a user, the device comprising:
a flexible support intended to fit a localized region of a skull of the user;
a set of sensors for detecting electrical signals generated by neuronal activity of the user, arranged on the support so as to form contacts with a scalp of the user when the device is worn by the user, each sensor comprising a plurality of conductive blades arranged parallel to one another, each conductive blade being concave at a zone of contact with the scalp, the conductive blades including at least one point configured to make initial contact with the scalp when the portable device is positioned on the skull, the at least one point being non-conductive;
for each sensor, an electronic circuit for filtering and amplifying the electrical signals detected by the sensor, the electronic circuit being incorporated in the flexible support and forming with the sensor an active electrode; and
a housing comprising an electronic system for processing the signals from each electronic circuit, the housing being linked mechanically to the flexible support to form, with the support, a means of attachment to a garment or accessory intended to be worn by the user.
2. The portable device as claimed in claim 1 , wherein the flexible support is openwork and comprises a plurality of branches on which at least some of said sensors are arranged.
3. The portable device as claimed in claim 2 , wherein the flexible support comprises a central part, the branches being linked to said central part by means of flexible lateral branches.
4. The portable device as claimed in claim 1 , wherein the flexible support and the housing are linked mechanically by a flexible attachment point, making it possible to form a clip-form attachment means.
5. The portable device as claimed in claim 1 , wherein each sensor is movably mounted on said flexible support.
6. The portable device as claimed in claim 1 , wherein each sensor comprises a base intended to be arranged in a recess of said flexible support, in electrical contact with said electronic circuit.
7. The portable device as claimed in claim 6 , wherein said electrical contact is ensured by a spring finger, forming a contact point with said base.
8. The portable device as claimed in claim 1 , wherein the conductive blades comprise a conductive polymer coating forming a conductive layer intended to enter into contact with the scalp of the user.
9. A connected garment for acquiring electroencephalographic (EEG) signals comprising a portable device as claimed in claim 1 .
10. A method for acquiring electroencephalographic (EEG) signals emitted by a user by means of a portable device as claimed in claim 1 , comprising:
measuring of electrical signals generated by the neuronal activity of the user by means of said sensors in contact with the scalp of the user; and
processing of the electrical signals from said electronic circuits by means of the electronic system arranged in said housing.