World’s Smallest Pacemaker, Smaller Than a Grain of Rice

Explore the workings of the world's smallest pacemaker, even tinier than a grain of rice, now available for use.

A Groundbreaking Tiny Pacemaker

In a significant breakthrough, researchers at Northwestern University have developed the world’s smallest pacemaker, smaller than a grain of rice.

This pioneering device, still in its early developmental stage, provides a temporary solution for heart rhythm regulation and could dramatically transform the future of cardiac care.

Advanced Medical Technology

Powered by light and designed to dissolve in the body when no longer needed, this pacemaker represents a significant advancement in medical technology.

Although it may be years before it is ready for human trials, this wireless pacemaker is seen as a “transformative breakthrough” that may also lead to further medical innovations.

Hope for Children with Heart Defects

“To our knowledge, we have developed the smallest pacemaker in the world,” states John A. Rogers of Northwestern University. “Our primary motivation was to help children,” adds cardiologist Igor Efimov.

About 1% of children are born with heart defects and often require only temporary pacing after surgery. Within about a week, most of these young patients’ hearts mend on their own.

Innovative Features

A notable feature of this new pacemaker is its wireless capability. It measures just one millimeter in thickness and 3.5 millimeters in length, fitting into the tip of a syringe. Plus, it eliminates the need for surgical removal as it is designed to dissolve in the body when its job is done.

Current temporary pacemakers require surgical attachment of electrodes to heart muscles and wires leading to a device on the patient’s chest. When these pacemakers serve their purpose, removing the wires can sometimes cause damage.

The pacemaker has proven effective in tests conducted on mice, rats, pigs, dogs, and human heart tissues in the lab. Human trials could begin in about two to three years.