Game-Changing Innovation: World’s Smallest Pacemaker Is Smaller Than A Grain Of Rice

Researchers at Northwestern University have created the world's smallest pacemaker, which is small enough to fit inside the tip of a syringe and be injected into the body without surgery.

Researchers at Northwestern University have created the world's smallest pacemaker, which is small enough to fit inside the tip of a syringe and be injected into the body without surgery. With dimensions of just 1.8 millimeters in width, 3.5 millimeters in length, and 1 millimeter in thickness, the device is smaller than a grain of rice, yet it provides the same level of stimulation as a traditional pacemaker. The details of this pacemaker and how it works was published by researchers in the Journal Nature. Read on.

"We Have Developed The World's Smallest Pacemaker, " Professor John Rogers

Professor John Rogers, the Simpson Querrey Professor at Northwestern University and a member of the National Academy of Engineering, Sciences and Medicine wrote in a post on X, "Check out some brand new biomedical tech crazy cool, in my own, humble but admittedly biased opinion introduced in our paper (link below), published today in Journal Nature, titled "Millimetre-scale, bioresorbable optoelectronic systems for electrotherapy," where we describe the world's smallest cardiac pacemaker fully integrated, self-powered, light-controlled and completely bioresorbable, with an overall size that is somewhere between that of a grain of rice and a sesame seed! The clinical use case is for patients particularly pediatric patients who require temporary pacing during the recovery period following a cardiac surgery."

Check the post below:

Check out some brand new biomedical tech crazy cool, in my own, humble but admittedly biased opinion introduced in our paper (link below), published today in @Nature, titled "Millimetre-scale, bioresorbable optoelectronic systems for electrotherapy," where we describe the pic.twitter.com/fqf9GZTsTY John A Rogers (@ProfJohnARogers) April 2, 2025

According to experts, this new invention can work on heart of all sizes. Engineers who designed it mentioned that it is best-suited to tiny, fragile hearts of newborn babies with congenital heart defects. Prof. John A Rogers, who led the device's development said, "We have developed what is, to our knowledge, the world's smallest pacemaker.

"There's a crucial need for temporary pacemakers in the context of pediatric heart surgeries, and that's a use case where size miniaturisation is incredibly important. In terms of the device load on the body - the smaller, the better."