The present disclosure provides systems, apparatuses, and methods for use of wearable electrode assemblies. The electrode assemblies improve comfort by providing increased overall surface area of their bottom surfaces, which make contact with the patient's scalp and hair. Collapse, compression, or telescoping of the bottom surface will thereby decrease the direct force and/or pressure applied by the distal member or members of the bottom surfaces to the skin. This may be advantageous in patients who have little to no hair in electrode contact areas, patient populations that are particularly skin-sensitive, and/or patients which must wear the electrode assemblies of an extended time period. The electrode assemblies further include structures to dispense and/or maintain conductive gel placed over the patient's skin, thereby maintaining electrical connection quality, and/or to facilitate the clearing of skin and/or hair prior to establishing an electrical connection.

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.

An adhesive electrode for the registration of electric and electrobiological signals and/or for stimulating a patient includes a patient contact portion and a transmission portion. The patient contact portion includes a layer of adhesive electrolyte material in contact with the patient's skin, a layer of conductive material, and a layer of insulating material. The transmission portion is also connected to the conductive layer. The layer of conductive material includes at least partially a layer of magnetic material, the transmission portion being removably secured to the layer of magnetic material.

An introducer is provided for introducing a sensor into the body of a patient. The introducer connects to a sensor hub. When the sensor hub and introducer are connected, the introducer needle is exposed. When the sensor hub and introducer are disconnected, a needle cover and the needle move with respect to each other so that the needle cover substantially covers the needle, protecting a user from being injured by the needle.

A wearable mechano-acoustic sensor for continuous cardiorespiratory monitoring, and methods of making and using the same. The sensor includes a diaphragm with a chamber and a channel connected to the chamber, a plurality of electrodes including at least an anode and a cathode extending into the channel, and a liquid electrolyte solution that fills the chamber and channel. When the diaphragm is attached to a user's chest, mechano-acoustic movement from the chest cause the diaphragm to move, pushing the electrolyte solution across the electrodes. A voltage is applied to the anode and an electrochemical current is determined by the flux from the anode to the cathode by the modulation of the electrolyte solution across the electrodes and cardiorespiratory signals are measured from the electrochemical currents.

A hydrogel 1 having a laminate structure of layer A 10 and layer B 20, wherein layer A 10 contains a monomer-derived component, water, a humectant, a water-insoluble polymer having tackiness and an amphiphilic polymer, the water-insoluble polymer is contained in a proportion of 3 to 20 wt % based on a total amount of layer A, and the amphiphilic polymer is a polyvinyl alcohol having a saponification degree of 50 to 75% and is contained in a proportion of 0.05 to 5 wt % based on the total amount of layer A; layer B 20 contains a monomer-derived component, water and a humectant and is substantially free of a water-insoluble polymer having tackiness and a polyvinyl alcohol; and an amount of the water based on a total amount of layer B is the amount of water based on the total amount of layer A±10 wt %.

A brush electrode includes an electrode base that is connectable to an external device that is configured to generate an electrical signal or receive an electrical signal. A plurality of strand electrodes extend outward from the electrode base. A distal end of each strand electrode is configured to contact a skin surface. The strand electrodes are configured to hold an electrolyte to facilitate ionic conduction of the electrical signal to or from the skin surface.

Various aspects of the disclosure relate to evaluating the electromagnetic impedance characteristics of a material under test (MUT) over a range of frequencies. In particular aspects, a system includes: an electrically non-conducting container sized to hold the MUT, the electrically non-conducting container having a first opening at a first end thereof and a second opening at a second, opposite end thereof; a transmitting electrode assembly at the first end of the electrically non-conducting container, the transmitting electrode assembly having a transmitting electrode with a transmitting surface; and a receiving electrode assembly at the second end of the electrically non-conducting container, the receiving electrode assembly having a receiving electrode with a receiving surface, wherein the receiving electrode is approximately parallel with the transmitting electrode, and wherein the transmitting surface of the transmitting electrode is larger than the receiving surface of the receiving electrode.

The present disclosure relates to a wearable device with a bridge portion and systems/methods relating to the device. Preferred embodiments may include two flexible wings and a bridge connecting the two wings. In some embodiments, the upper surface of the bridge can be non-adhesive and uncoupled to the flexible wing such that the flexible wing can be decoupled from the bridge when the adhesive is adhered to the surface of a user. The bridge can be narrower in some portions, and extend around the housing of the monitor. The bridge can extend beneath the housing and bisect the two flexible wings.

An electronic device is provided. The electronic device includes a housing including at least one electronic component, and a pad structure coupled with the housing, and attached to a user body. The pad structure includes a first adhesive material having an adhesive strength at which the electronic device holds attachment in response to lack of existing water or humidity, and a second adhesive material abutting the first adhesive material and having an adhesive strength at which the electronic device holds the attachment in response to existing water or humidity.