World’s smallest pacemaker fits in a syringe and is activated by light

Photo caption: It’s hard to imagine that this diminutive device delivers as much stimulation to the heart as a regular pacemaker. Photo credit: John A. Rogers / Northwestern University. Article by Abhimanyu Ghoshal. New Atlas – April 4, 2025. Source: Northwestern Now.

Engineers at Illinois’ Northwestern University have developed the tiniest pacemaker you’ll ever see. It’s several times smaller than a regular pacemaker, and it’s designed for patients several times smaller than the average pacemaker user. This device is dwarfed by a grain of rice, and can be injected into newborn babies with congenital heart diseases for temporary or long-term use with a regular syringe. About one in every 100 children are born with such defects. […]

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Video: World’s smallest pacemaker is activated by light – Northwestern University