Tampon-Based Sensors for Monitoring Intravaginal pH Levels

The proposed work is a proof-of-concept study aimed at developing a sensor capable of measuring and monitoring vaginal pH. The objective of this research is to examine the design concepts and operational principles of a vaginal sensor that utilizes soft, biodegradable textile materials. Traditional methods of assessing vaginal pH levels, such as evaluating vaginal fluids or discharge from the vaginal walls, are difficult to perform consistently over long periods and are often prone to errors. Our sensor demonstrates a simple fabrication technique of pH value monitoring based on the capacitive principle by embroidering the sensors onto a tampon, which is comfortable and biocompatible. Silver conductive threads, known for their antibacterial properties, are used. Two different geometries of embroidered electrodes are proposed for the pH sensors, enabling the monitoring of vaginal pH. A device that tracks changes in pH value aids in early detection, notifies users of potential health changes, supports women's self-management of wellness, and helps prevent conditions, such as vaginitis or sexually transmitted infections associated with pH levels above 4.7.