MUMBAI, India, July 7 -- Intellectual Property India has published a patent application (202641075346 A) filed by Hindusthan Institute Of Technology on June 18, 2026, for Design And Implementation Of Laser Based Non-Invasive Glucose Monitoring System With Automatic Insul.
Inventors include Dr. C. Natarajan; Dr. D. Jeyakumari; Dr. B. Paulchamy; D. Suganthi; R. Kavin; N. Kishor; S. Kishore; and E. Santhosh.
The application for the patent was published on July 03, 2026, under issue no. 27/2026.
Abstract: Diabetes mellitus is a chronic metabolic disorder characterized by elevated blood glucose levels resulting from insufficient insulin production or impaired insulin utilization. Continuous monitoring of blood glucose levels is essential for effective diabetes management and prevention of serious complications such as cardiovascular diseases, kidney failure, and nerve damage. Therefore, there is a growing demand for noninvasive glucose monitoring systemsthai can estimate glucose levels without the need for blood extraction. This project presents the design and development of a laser-based non-invasive glucose monitoring system integrated with an automatic insulin injection mechanism. The proposed system utilizes a 650 nm red laser as the optical light source, which passes through the finger tissue placed inside a specially designed probe. The transmitted light intensity is detected by a photodetector sensor positioned opposite to the laser transmitter. Variations in light absorption and scattering caused by glucose concentration in the blood affect the amount of light reaching the detector. The photodetector converts the received optical signal into an electrical voltage signal, which is then processed by an Arduino Uno microcontroller using its built-in analog-to-digital converter. The microcontroller analyzes the sensor signal and estimates the glucose level using a calibration model. The calculated glucose value is displayed on a 16x2 LCD display for real-time monitoring. When the detected glucose level exceeds a predefined threshold, the system automatically activates a relay controlled DC motor mechanism that drives a syringe-based insulin injector. The motorized mechanism delivers insulin in a controlled manner to demonstrate the concept of automated insulin administration. Limit switches are incorporated in the . system to ensure safe motor operation and prevent excessive syringe movement. The proposed prototype demonstrates the feasibility of integrating optical sensing, embedded signal processing, and automated actuation for glucose monitoring and insulin delivery. Although the system is developed as a proof- of concept prototype, it highlights the potential of non-invasive optical techniques in improving patient comfort and enabling automated diabetes management systems. Future improvements may include advanced calibration algorithms, multi-wavelength sensing techniques, and integration with wireless health monitoring platforms to enhance measurement accuracy and reliability.
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