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In a preliminary study, the researchers tested an energy harvesting device that uses the piezoelectric effect. Dr. Amin Karami, a lead author of the study and a researcher in the Department of Aerospace Engineering at the University of Michigan, said the method is a promising technical solution for pacemakers because the pacemaker requires only a small amount. Electricity can run. The piezoelectric effect can also be used in other intracardiac implant devices such as defibrillators.
Current pacemakers must be replaced every 5-7 years when the battery is exhausted, which is very expensive and inconvenient. Karami said that many patients have put on pacemakers since childhood, and if this new technology is realized, they will save a lot of trouble in their lives. “For children, they have to use pacemakers for many years. If this new technology is used, they will do less surgery.â€
The researchers first measured the intra-thoracic heartbeat-induced vibrations and then replicated them in the lab using a "vibrator" and connected them to the prototype of the heart-capture device they developed. The performance test of the prototype device, based on 100 sets of simulated heartbeats with different heart rates, showed that more than 10 times more power was required than the pacemaker. The next step is to implant this energy capture device, which is only half the size of the current battery used in pacemakers.
Researchers have now developed both linear and nonlinear cardiac energy capture devices that support conventional pacemakers. Linear devices are only suitable for a specific heart rate, and heart rate changes prevent them from harvesting enough power. Non-linear devices use magnetic materials to increase power production and are no longer sensitive to heart rate changes. The non-linear device can operate from a heart rate range of 20 to 600 beats per minute to harvest enough power to continuously power the pacemaker. Moreover, devices such as cell phones or microwave ovens do not affect the normal operation of the nonlinear device.
The new invention can convert heartbeat kinetic energy into cardiac pacemaker electrical energy