MUMBAI, India, May 1 -- Intellectual Property India has published a patent application (202641050362 A) filed by Srm Institute Of Science And Technology, Ramapuram Campus; and Easwari Engineering College, Chennai, Tamil Nadu, on April 20, for 'ankle-wearable multimodal bioimpedance-photoplethysmography system for early peripheral perfusion impairment detection in diabetic patients.'
Inventor(s) include Kr Jaya Sudharshan; Dr. K. Lalitha; Dr. Pushpa B; and Dr Vani R.
The application for the patent was published on May 1, under issue no. 18/2026.
According to the abstract released by the Intellectual Property India: "Peripheral artery disease (PAD) occurs when the arteries in arms and legs are narrower, which makes it harder for blood to flow. The most prevalent cause is atherosclerosis. This is a progressive vascular illness which is particularly common among patients with diabetes. The present diagnostic methods like Doppler ultrasound and ankle-brachial index measures are limited to clinical settings and is not capable of performing continuous monitoring. This invention results in a small, ankle-worn multimodal sensing system that uses bioelectrical impedance analysis and reflecting photoplethysmography (PPG) to check how well the blood vessels are working in real time. Electrical impedance characteristics are utilized to assess tissue conductivity and arterial compliance, whereas optical pulse waveforms offer insights into microvascular perfusion. A feature-level fusion technique combines both types of data to generate a peripheral perfusion risk index that shows early-stage PAD. The suggested system makes it possible to monitor blood vessels continuously and without any intrusive procedures, making it appropriate for use at home."
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