A printed tattoo electrode includes an interconnection unit with a stiff magnetic contact component including one or more attachment magnets configured to magnetically attach the electrode sensor to an external device. A stiff electrical contact component is electrically connected to output interface contacts for coupling electrical signals to the external device. And at least one bridge component is configured to mechanically connect the electrical contact component and the magnetic contact component to the output interface contacts. The bridge component is characterized by a connecting length with gradually varying stiffness so as to distribute mechanical stresses between the electrode sensor and the external device and avoid motion artifacts in the electrical signals.

A skin care device can include a body including a battery and a grip electrode electrically connected to the battery, and a head connected to one end of the body. The head includes a contact electrode electrically connected to the battery and configured to come in contact with a skin of a user, and at least one ultraviolet light source disposed inside the head to face the contact electrode. Further, the contact electrode includes a fastening part fastened to the head and having at least one hole formed therein to correspond to the at least one ultraviolet light source, and a plurality of contact protrusions protruding from a top surface of the fastening part.

A device for electrically stimulating skin, in particular for stimulating the activity of fibroblasts, including an electronic circuit for generating a sawtooth biphasic or cyclic alternating electric current; at least two electrodes connected to the electronic circuit, which are configured so as to be applied to the skin in order to allow the electric current generated to pass therethrough.

A beauty instrument with mask includes a flexible mask and a controller. The flexible mask includes a first flexible layer, a second flexible layer, a plurality of functional layers located between the first flexible layer and the second flexible layer, and a plurality of electrodes electrically connected with the plurality of functional layers. The functional layer includes a graphene layer. The flexible mask is electrically coupled with the controller via the plurality of electrodes.

Tumors in portions of a subject's body that have a longitudinal axis (e.g., the torso, head, and arm) can be treated with TTFields by affixing first and second sets of electrodes at respective positions that are longitudinally prior to and subsequent to a target region. An AC voltage with a frequency of 100-500 kHz is applied between these sets of electrodes. This imposes an AC electric field with field lines that run through the target region longitudinally. The field strength is at least 1 V/cm in at least a portion of the target region. In some embodiments, this approach is combined with the application of AC electric fields through the target region in a lateral direction (e.g., front to back and/or side to side) in order to apply AC electric fields with different orientations to the target region.

According to some aspects, a device is presented herein that is configured to be located underneath an eyelid and worn by a user for treating dry eye. The device includes a first surface configured to face a portion of a sclera of the eye, and a second surface configured to face an eyelid and to be completely covered by the eyelid. In some embodiments, the device further includes a plurality of stimulation electrodes proximal to the first surface, wherein the plurality of stimulation electrodes is configured to stimulate the sclera. The device further includes an energy storage element coupled to the plurality of stimulation electrodes. The energy storage element is configured to supply power to the plurality of stimulation electrodes. The device further includes a processor configured to control a supply of energy from the energy storage element to the plurality of stimulation electrodes to stimulate the sclera.

A skin care device according to an embodiment of the present disclosure includes a substrate; a case for covering surface of the substrate; and at least one galvanic current application device electrically connected to the substrate, in which each of the at least one galvanic current application device includes a contact head that forms a contact surface with respect to a user's skin and is electrically connected to the substrate; and a holder provided between the substrate or the case and the contact head, and in which the holder includes an elastic fixing body elastically fixing the contact surface of the contact head to a position spaced apart from the case by a predetermined length.

An electrode system include a flowable and cohesive surface contact element comprising a hydrophilic polymer swollen with an electrolyte fluid, the contact element having a Q′ ratio of at least 5 as defined by the equation $Q^{\prime }=\frac{W_W}{W_G}$
wherein W.sub.G is the dry weight of the hydrophilic polymer and W.sub.W is weight of water in the sample after absorption of the electrolyte fluid comprising water and an electrolyte salt. The surface contact element can consist essentially of the hydrophilic polymer swollen by the electrolyte fluid. Another electrode system includes a contact element including a crosslinked hydrophilic polymer matrix. The contact element has a Q′ ratio of at least 5 as defined by the equation $Q^{\prime }=\frac{W_W}{W_G}.$
The contact elements can also have a Q′ ratio of at least 6, at least 7, at least 10 or even at least 11.

The invention relates to a high voltage source to be coupled to an electrode arrangement for a dielectric barrier discharge plasma treatment. It has a high voltage transformer device including a primary and secondary inductor coupled via a magnetic circuit. A feed circuit including a power capacitor, the power capacitor coupled with the primary inductor and a first controllable conductor in series. A controller is arranged to intermittent switching of the first controllable conductor in on- and off-states; and a second controllable conductor is coupled in parallel to the primary windings; the controller arranged to switch the second controllable conductor to a conducting on-state when the first controllable conductor is in an on-state to short the resonating current in the primary inductor.

Devices and methods for treating dry eye and other ophthalmic conditions are provided. The devices may be configured to be located in a patient's fornix. In one embodiment, a device includes a flexible substrate, an antenna disposed on a first side of the substrate, one or more electronic components disposed on the first side of the substrate, and a first electrode and a second electrode disposed on a second side of the substrate opposite the first side. Each of the first electrode and the second electrode comprises an electrode surface and a plurality of slots in the electrode surface defining a plurality of electrode prongs. The plurality of slots facilitate or promote near-field coupling between a transmitter and the antenna. The one or more electronic components are configured to provide electrical power to the first electrode and the second electrode.