# US 2021/0345895 A1 · Patch-type wearable device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0345895 A1 - Document ID: US20210345895A1 - Status: Published application - Kind: A1 - Application number: 17/317,788 - Filed: 2021-05-11 - Published: 2021-11-11 - Earliest claimed: 2020-05-11 - Assignees: Gwangju Institute of Science and Technology - Applicants: Gwangju Institute of Science and Technology - Inventors: Youngmin Song; Minhyung Kang; Gilju Lee - Web page: https://patentgrep.com/patent/US20210345895A1 ## CPC - A61B 5/14552: {Details of sensors specially adapted therefor} - A61B 5/0004: {characterised by the type of physiological signal transmitted} - A61B 5/02416: {using photoplethysmograph signals, e.g. generated by infrared radiation (A61B5/14552 takes precedence)} - A61B 5/14557: {specially adapted to extracorporeal circuits} - A61B 5/6833: {Adhesive patches} - H04B 5/26: using coils - H04B 5/70: specially adapted for specific purposes - A61B 5/02055: {Simultaneously evaluating both cardiovascular condition and temperature} - A61B 2050/0014: {Cooling means} - A61B 2560/0252: using ambient temperature - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) - H04B: TRANSMISSION ## Abstract A patch-type wearable device includes a circuit layer including a light emitting element and a light receiving element, a wireless communication module mounted on the circuit layer and configured to communicate with another device, and a passive radiation layer constituting an upper layer of the circuit layer and exhibiting passive radiation characteristics. ## Claims ### Claim 1 A patch-type wearable device comprising: a circuit layer including a light emitting element and a light receiving element; a wireless communication module mounted on the circuit layer and configured to communicate with another device; and a passive radiation layer constituting an upper layer of the circuit layer and exhibiting passive radiation characteristics. ### Claim 2 (depends on 1) The patch-type wearable device of claim 1, further comprising an encapsulation layer disposed between the light emitting element and the light receiving element to block internal optical noise. ### Claim 3 (depends on 2) The patch-type wearable device of claim 2, wherein the encapsulation layer constitutes a lower layer of the circuit layer, and wherein the light emitting element and the light receiving element are mounted on the lower surface of the circuit layer. ### Claim 4 (depends on 3) The patch-type wearable device of claim 3, wherein the light emitting element and the light receiving element are horizontally disposed, and wherein the encapsulation layer is positioned on a side of the light emitting element and a side of the light receiving element. ### Claim 5 (depends on 1) The patch-type wearable device of claim 1, further comprising a controller configured to control the light emitting element to emit light, and transmit data obtained through the light receiving element to the another device through the wireless communication module. ### Claim 6 (depends on 5) The patch-type wearable device of claim 5, wherein the wireless communication module is a near field communication (NFC) module, wherein the NFC module includes a coil and an NFC processor, and wherein, when the another device approaches, the NFC module supplies power induced through the coil to the controller. ### Claim 7 (depends on 5) The patch-type wearable device of claim 5, wherein the data is used to determine at least one of oxygen saturation or heart rate. ### Claim 8 (depends on 1) The patch-type wearable device of claim 1, wherein the passive radiation layer is made of a porous polymer and exhibits passive radiation characteristics. ### Claim 9 (depends on 8) The patch-type wearable device of claim 8, wherein the porous polymer includes at least one of cellulose acetate, PMMA, SEBS, P(VdF-HFP), polystyrene, ethyl-cellulose, PLA, PLCL, or PCL. ### Claim 10 (depends on 8) The patch-type wearable device of claim 8, wherein the passive radiation layer does not include a metal heat sink. ### Claim 11 A patch-type wearable device comprising: a circuit layer including a light emitting element configured to emit light to a skin and a light receiving element configured to receive light emitted from the light emitting element; an encapsulation layer attached to the skin; and a passive radiation layer disposed on the circuit layer and exhibiting passive radiation characteristics. ### Claim 12 (depends on 11) The patch-type wearable device of claim 11, wherein the encapsulation layer is disposed between the light emitting element and the light receiving element to block internal optical noise. ### Claim 13 (depends on 11) The patch-type wearable device of claim 11, further comprising a communication module mounted on the circuit layer and configured to communicate with another device. ### Claim 14 (depends on 13) The patch-type wearable device of claim 13, wherein the communication module is a wireless near field communication (NFC) module. ### Claim 15 (depends on 11) The patch-type wearable device of claim 11, wherein the passive radiation layer includes a polymer having a plurality of micro-scale or nano-scale pores. ### Claim 16 (depends on 11) The patch-type wearable device of claim 11, wherein the passive radiation layer includes a white porous polymer. ### Claim 17 A patch-type wearable device comprising: a circuit layer configured to sense a biometric signal adjacent to a skin; an encapsulation layer attached to the skin; and a passive radiation layer disposed on the circuit layer and including a plurality of pores to exhibit passive radiation characteristics. ### Claim 18 (depends on 17) The patch-type wearable device of claim 17, wherein the circuit layer includes a light emitting element and a light receiving element, and wherein the encapsulation layer is disposed between the light emitting element and the light receiving element. ### Claim 19 (depends on 17) The patch-type wearable device of claim 17, further comprising a wireless communication module mounted on the circuit layer and configured to communicate with another device. ### Claim 20 (depends on 17) The patch-type wearable device of claim 17, wherein the passive radiation layer does not include a metal material and includes a polymer.