Disposable electrodes for portable stimulation devices and systems and methods for replacement of the disposable electrodes

A disposable electrode unit for releasably adhering to a wearable auricular stimulation device, the disposable electrode unit comprising:

• a structural support layer having an asymmetric shape configured to wrap partially around an ear of a wearer, the structural support layer comprising a plurality of openings configured to align with a plurality of electrode contacts of the wearable auricular stimulation device;
• and
• one or more adhesive layers, each respective adhesive layer of the one or more adhesive layers being composed of one or more materials, wherein
• the one or more materials comprises a conductive material configured to provide at least one of electrical conductivity or adhesion, and
• the one or more adhesive layers are disposed to fill the plurality of openings, thereby enabling electrical conduction from the plurality of electrode contacts to tissue regions on and/or surrounding the ear of the wearer while the disposable electrode unit is attached to the wearable auricular stimulation device and the wearable auricular stimulation device is donned by the wearer;
• wherein a device-facing surface of the one or more adhesive layers is configured to releasably adhere to one or more surfaces of the wearable auricular stimulation device including the plurality of electrode contacts;
• and
• wherein a skin-facing surface of the one or more adhesive layers is configured to releasably adhere to the tissue regions on and/or surrounding the ear of the wearer.