Picture a health worker in a remote corner of Manipur, hours from the nearest paved road, opening a backpack — and inside, row upon row of vaccine vials held at exactly the right temperature. That cold, quiet hum inside a bag is the sound of one of public health’s hardest problems being solved. The World Health Organization estimates that around half of all vaccines go to waste before they are ever administered, most of it to broken cold chains; Gavi estimates 2.3 million children die each year from lack of access to vaccines, with 18 million ‘zero-dose’ children missed entirely, often because the last mile simply has no refrigeration. A startup from Manipal decided the last mile deserved better engineering.
The company is Blackfrog Technologies, founded in 2015 by Mayur Shetty, Donson Souza and Ashlesh Bhat, and grown out of the Manipal Universal Technology Business Incubator. Their answer to the last-mile cold chain is Emvólio — a portable, battery-powered, backpack-style refrigerator that carries vaccines, insulin, blood serums, breast milk and other biologicals at a strictly controlled temperature, no icebox required.
Engineering out the icebox
Iceboxes are the standard last-mile tool, and they are unforgiving: no temperature regulation, accidental freezing, no accountability. The company notes that nine of the fifteen vaccines commonly administered today are freeze-sensitive and must stay between 2 and 8°C. Emvólio replaces guesswork with a patented rapid-cooling system built on solid-state cooling — no compressors, no motors, no moving parts — driven by a smart PID controller that keeps every vial in the chamber blanketed in uniformly temperature-controlled air, with minimal freeze-thaw cycles. Every time the lid opens and ambient air rushes in, the device pulls the chamber back to safe limits more than 96% faster than an ice-based carrier, according to the Government of India’s ISTI technology listing, which rates Emvólio at TRL-9 with three patents filed.
The hardware numbers tell the rest: a 1.55-litre chamber carrying 50 or more vials, 45+ hours of battery-powered operation at +25°C ambient, and solar-charging support so the cold chain never depends on the grid. Blackfrog says Emvólio is the first product prequalified by WHO-PQS as an active-cooled carrier; it conforms to IEC 60601 medical-device standards, and the company manufactures it as an ISO 13485-certified medical device maker, backed early on by BIRAC grants under the Department of Biotechnology.
An IoT nerve centre for the cold chain
The cleverness doesn’t stop at cooling. Emvólio is part of an IoT system: the backpack carries live location tracking, continuous temperature and battery monitoring, and an on-device display with alerts that warn of malfunctions before vaccines are at risk. The MyEmvólio software platform lets programme managers watch an entire fleet — temperature, uptime and downtime, distance travelled, geo-tagged mapping — turning a device into a managed, accountable public-health asset.
From Manipal to the world
Deployment is where Blackfrog’s engineering meets its mission. CEO Mayur Shetty told the Global Innovation Fund that Emvólio is now operational in 800 rural health centres across 16 Indian states, including hard-to-reach areas, with National Health Mission clearances — and the device is also in use in Nigeria and Kenya. During the pandemic, the company donated units to Udupi district’s hospital for Covid-19 specimen transport. The impact attracted serious capital: a $1 million investment from the Global Innovation Fund — the first deal from its $120 million Thrive climate-health fund — alongside $350,000 each from the Manipal Education and Medical Group and the Rainmatter Foundation, plus INR 9 crore from Next Bharat Ventures, whose impact report credits Emvólio with reaching over 251,000 beneficiaries in India and a presence in Africa. Blackfrog reports a production capacity of 1,500 units a month, and YourStory named it to the Tech30 2026 cohort.
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Why this one is worth watching
Cold-chain engineering is invisible when it works — no drama, no headlines, just a vial that arrives potent and a child who gets protected. Blackfrog’s achievement is making world-class medical-grade refrigeration backpack-portable, solar-capable and connected, manufactured in India and certified to global standards. The company is now developing larger-capacity refrigeration systems for even more demanding cargo, including organs for transplantation. From a university incubator in Manipal to 16 states and two continents, Emvólio is proof that some of the most exceptional engineering in India isn’t flying to space — it’s walking the last mile, keeping its cool.
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