Hydrogel pad
A hydrogel pad is configured for use with an electrode or a wearable device to measure vital signs of a patient. The hydrogel pad includes a flexible support having one or more openings in which hydrogel is disposed. A membrane covers one side of the hydrogel to protect it from gaining or losing too much moisture. A removable backing covers the other side of the hydrogel until it is applied to a patient, at which point the other side contacts the patient's skin. The protective membrane can be pierced by an angular conductive contact of a device to contact the hydrogel creating an electric conduit between the patient and the device. When the device is removed, the membrane at least partially closes to cover and protect the hydrogel.
1 . A hydrogel pad comprising:
a flexible support having a first surface, a second surface opposite the first surface, and a first opening through a thickness of the flexible support;
a first hydrogel portion disposed within the first opening, the first hydrogel portion having a first surface adjacent the first surface of the flexible support and a second surface adjacent the second surface of the flexible support;
a membrane comprising non-conductive, flexible, polymer-based material covering the second surface of the first hydrogel portion and affixed to the second surface of the flexible support, wherein the membrane includes a perforation comprising one or more slits configured to allow a piercing contact of a device to pass through the membrane to the first hydrogel portion, establish electrical communication with the first hydrogel portion, and cover the first hydrogel portion after the piercing contact is removed, wherein the perforation is preformed and centrally positioned above the first hydrogel portion for alignment with the piercing contact of the device; and
an adhesive positioned around the first hydrogel portion, the adhesive affixing the membrane to the flexible support, and the adhesive being configured to releasably affix the hydrogel pad to the device.
2 . The hydrogel pad of claim 1 , wherein the flexible support further comprises a second opening, a second hydrogel portion is disposed within the second opening, and the membrane is covering the second hydrogel portion.
3 . The hydrogel pad of claim 1 , wherein the membrane is a self-healing membrane configured to allow the piercing contact of the device to pass through to the first hydrogel portion and establish electrical communication while keeping moisture from passing through the membrane, and wherein the membrane closes after the piercing contact is removed.
4 . The hydrogel pad of claim 1 , further comprising a backing layer releasably affixed to the first surface of the first hydrogel portion and the first surface of the flexible support.