公开(公告)号：US20240023882A1

公开(公告)日：2024-01-25

申请号：US18031389

申请日：2021-10-18

Applicant: NORTHWESTERN UNIVERSITY

Inventor： John A. Rogers ,  Anthony R. Banks ,  Surabhi Rao Madhvapathy ,  Heling Wang ,  Yonggang Huang ,  Shuai Xu

IPC: A61B5/00 ,  A61B5/145 ,  G01N25/56

CPC classification number: A61B5/443 ,  A61B5/4875 ,  A61B5/6832 ,  A61B5/14521 ,  A61B5/002 ,  G01N25/56 ,  A61B2562/164 ,  A61B2562/166 ,  A61B2562/0271

Abstract: This invention relates to a soft, battery-free, flexible, non-invasive, reusable hydration sensor adherable to even small-areas and curvilinear surfaces of a body. The hydration sensor measures volumetric water content in skin as a function of depth, and wirelessly transmits data to a portable smart device. The hydration sensor includes a top layer for thermal, chemical and mechanical isolation of the hydration sensor from an environment; a bottom layer operably placed on a target area of interest on the skin; and a flexible printed circuit board (f-PCB) disposed between the top layer and the bottom layer. The f-PCB contains electronics for sensing and wireless communication. The bottom layer operably serves as a direct interface between the f-PCB and the skin and comprises a flexible adhesive for attaching the hydration sensor to the skin.