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Battery-free pacemakers to be powered by heart underway

Next-generation battery-free implantable pacemakers, which in turn, will be empowered by your heart itself, are under development by scientists.

Set with an objective to eliminate the medical risks of deploying a battery charge, this new advancement will eliminate the medical risks, costs and inconvenience of having a battery replacement every five to 12 years for millions of people worldwide, researchers said.

This unusual source of charge for the pacemaker is based upon a piezoelectric system that converts vibrational energy – created inside the chest by each heartbeat – into electricity to power the pacemaker.

About the size of a pocket watch, pacemakers are implanted under the skin through an incision in the chest. Wires, also called leads, connect the device to the heart and deliver electrical signals that regulate the heart’s activity.

“Essentially, we’re creating technology that will allow pacemakers to be powered by the very heart that they are regulating,” said M Amin Karami, assistant professor of mechanical engineering at the University at Buffalo School of Engineering and Applied Sciences, who is leading the research.

The new wireless option does not require leads because it rests inside the heart. This removes a potential point of failure, but the device still relies on a battery that must be replaced as often as the batteries that conventional pacemakers use.

The idea of heart-powered pacemakers came to Karami after doing PhD work on piezoelectric applications for unmanned aerial vehicles and bridges. He wanted to apply that knowledge to the human body.

The heart was an obvious choice because of its relative strength and constant motion.

“To see the heart in motion – even an animation – is to be awestruck. It moves significantly. In turn, that movement creates energy that we’re just now figuring out how to harvest,” said Karami.

Karami initially designed a flat piezoelectric structure for a conventional pacemaker. A prototype generated enough power to keep the pacemaker running at a range of 7 to 700 beats per minute.

With the development of wireless pacemakers, however, he has revamped the design to accommodate the smaller, tube-shaped device.

Karami, who is already talking to device-makers, is building the new prototype and expects to have animal tests done within two years.

Source: PTI
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