MUMBAI, India, Sept. 28 -- Intellectual Property India has published a patent application (202641111015 A) filed by Dr B Nagaraj; Shustigaa M V; Kabeesh S; Sabarinathan V; Mubarak Basha Y; Matheshwari S; and Dr. Kalaiselvan S on September 16, 2026, for Controlled-Release Ph Sensing Assembly For Sustainable Hygiene Systems.
Inventors include Shustigaa M V; Kabeesh S; Sabarinathan V; Mubarak Basha Y; Matheshwari S; and Dr. Kalaiselvan S.
The application for the patent was published on September 25, 2026, under issue no. 39/2026.
Abstract: The present invention relates to a biodegradable absorbent hygiene product comprising a controlled chemical sensing system for early detection of abnormal pH variations in body fluids. Traditional hygiene products like sanitary napkins, diapers, and period underwear are not health-monitoring capable, primarily focusing on absorption and disposal. In addition, the synthetic materials of these products are also a huge source of pollution in the environment. The present invention relates to a biodegradable absorbent core made from natural compostable fibers and an integrated pH-responsive sensing module comprising a natural anthocyanin-based indicator. The sensing material is incorporated into a biodegradable alginate–chitosan encapsulation matrix to enhance storage stability and prevent premature activation. The invention provides a moisture-responsive protective barrier for controlled activation after sufficient fluid exposure, thus reducing false triggering and increasing detection accuracy. The proposed system generates distinguishable visual patterns corresponding to different abnormal pH levels, which can be interpreted more easily by the user, unlike conventional indicator strips. An important aspect of the present invention is that it is modular and adaptable for use in a variety of absorbent hygiene products such as sanitary napkins, diapers, reusable period panties, and medical absorbent pads. The invention provides a green and health-conscious hygiene solution by integrating biodegradability, controlled chemical sensing, and multi-product adaptability into a single integrity
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