Headsets and electrodes for gathering electroencephalographic data
Example headsets and electrodes are described herein. Example electrode units described herein include a guide defining an opening and an electrode disposed in the opening. The electrode has a housing, a spring, and a pin. The pin is biased outward from a first end of the housing via the first spring. The example electrode units also include a second spring disposed over the opening adjacent a second end of the housing.
1. An electrode unit comprising:
a guide having a first opening;
an electrode disposed in the first opening, the electrode movable in the first opening, the electrode having a body, a first spring, and a pin, the pin biased outward from a first end of the body via the first spring;
a second spring disposed over the first opening and engaged with a second end of the body;
a connector having a second opening, the guide disposed in the second opening, the connector to removably couple the electrode unit to a band to be disposed over a head of a subject, the connector being electrically conductive, the second spring in contact with the connector such that an electrical signal obtained by the electrode is transferred through the second spring and through the connector to the band; and
an electrode unit housing having a third opening, the connector disposed in the third opening.
2. The electrode unit of claim 1 , wherein the electrode is a first electrode, the body is a first body, the pin is a first pin, and further including a second electrode disposed in the first opening.
3. The electrode unit of claim 2 , wherein the second electrode includes a second body, a third spring, and a second pin, the second pin biased outward from a first end of the second body via the third spring.
4. The electrode unit of claim 3 , wherein the first electrode and the second electrode are independently adjustable via the first spring and the third spring.
5. The electrode unit of claim 4 , wherein the first electrode and the second electrode are simultaneously adjustable via the second spring.
6. The electrode unit of claim 1 , wherein the body is coupled to the second spring.
7. The electrode unit of claim 6 , wherein the body includes a protrusion extending through an aperture in the second spring, the body coupled to the second spring via a staking or press fit connection.
8. The electrode unit of claim 1 , wherein the connector is a magnet.
9. The electrode unit of claim 1 , wherein the guide is coupled to the connector via an interference fit.
10. The electrode unit of claim 1 , wherein the connector is substantially aligned with a bottom of the electrode unit housing, the guide and the electrode extending from the bottom of the electrode unit housing.
11. The electrode unit of claim 1 , wherein the electrode is movable through the first opening of the guide into a cavity of the electrode unit housing.
12. The electrode unit of claim 11 , wherein the second spring is disposed over the connector and the guide in the cavity.
13. The electrode unit of claim 12 , wherein, when the electrode moves into the cavity of the electrode unit housing, a center of the second spring flexes into the cavity.
14. The electrode unit of claim 13 , further including a pusher disposed in the cavity, an outer rim of the second spring coupled between the pusher and the connector.
15. The electrode unit of claim 14 , wherein the pusher is inserted into the cavity from a fourth opening in the electrode unit housing opposite the third opening.
16. The electrode unit of claim 13 , wherein the electrode unit housing includes a ledge in the third opening, wherein an outer rim of the second spring is coupled between the connector and the ledge.
17. The electrode unit of claim 13 , wherein an outer rim of the second spring remains in contact with the connector when the center of the second spring flexes into the cavity.
18. The electrode unit of claim 1 , wherein the second spring is a spiral spring plate.
19. An electrode unit comprising:
a connector having an opening;
a guide disposed in the opening of the connector, the guide having a first end, a second end opposite the first end, and a passage extending between a first opening in the first end and a second opening in the second end;
an electrode movably disposed in the passage, the electrode having a body, a first spring, and a pin, the pin biased outward from an end of the body via the first spring; and
a spiral spring plate disposed over the opening of the connector and the first opening of the guide, an outer rim of the spiral spring plate in contact with the connector, the body of the electrode engaged with the spiral spring plate such that the spiral spring plate biases the electrode outward from the second opening in the second end of the guide, the spiral spring plate movable between an unbiased state in which the second spring is substantially flat and a biased state in which a center of the spiral spring plate flexes away from the guide and the connector while the outer rim of the spiral spring plate remains in contact with the connector.
20. The electrode unit of claim 19 , wherein the electrode is a first electrode, further including a second electrode movably disposed in the passage.
21. The electrode unit of claim 1 , wherein the guide and the electrode unit housing are not electrically conductive.