US 10,376,422 B2
System and method for detecting wetness of article used by a care-receiver
Sharon Lin Charna, New Taipei (TW)
Assigned to Hello Nurse Medical Innovations, Inc., Irvine, CA (US)
Filed by Hello Nurse Medical Innovation, Inc., Irvine, CA (US)
Filed on Oct. 27, 2017, as Appl. No. 15/795,299.
Application 15/795,299 is a continuation in part of application No. 15/233,985, filed on Aug. 11, 2016.
Claims priority of application No. 104213035 U (TW), filed on Aug. 13, 2015.
Prior Publication US 2018/0049926 A1, Feb. 22, 2018
Int. Cl. A61F 13/42 (2006.01); A61B 5/00 (2006.01); A61B 5/11 (2006.01); H04B 1/3888 (2015.01); H04W 4/80 (2018.01); H04B 1/38 (2015.01)
CPC A61F 13/42 (2013.01) [A61B 5/0022 (2013.01); A61B 5/1117 (2013.01); H04B 1/3888 (2013.01); H04W 4/80 (2018.02); A61F 2013/424 (2013.01); H04B 2001/3894 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A system for detecting wetness of article used by a care-receiver, comprising: a radio frequency identity (RFID) reader, comprising: a first antenna circuit; a first wireless communication circuit, coupled to the first antenna circuit, configured to send a detection signal (excitation signal) through the first antenna circuit to a RFID tag, and configured to receive a response signal from the RFID tag in response to the sent detection signal, through the first antenna circuit, wherein the RFID tag is attached to an outer surface of an article used by the care-receiver, wherein the article comprises at least an absorbent material; and a processor unit configured to exhibit a signal strength indicator (RSSI) corresponding to a response signal from the RFID tag in response to the sent detection signal (excitation signal), through the first antenna circuit, and wherein the processor unit determines the wetness of the article at a usage time (t) by calculating a water content based on a difference between RSSI(0) and RSSI(t), wherein: RSSI(0) is a RSSI of the response signal from the RFID tag in response to the excitation signal at an initial time (t=0) prior to the article being used; and RSSI(t) is a RSSI of the response signal from the RFID tag in response to the excitation signal at the usage time (t) of the article being used.