At the American Heart Association's 2012 scientific meeting held on the 4th, a study submitted by scientists showed that an experimental device can convert the energy of the heart beat, thus providing enough power for the pacemaker.
In a preliminary study, the researchers tested an energy harvesting device that uses the piezoelectric effect. The study's lead author, Dr. Amin Karami, a researcher at the University of Michigan Aerospace Engineering Department, said that this method is a promising technology solution for pacemakers, because pacemakers need only a small amount of Electricity can run. The piezoelectric effect can also be used for other cardiac implant devices such as defibrillators.
Current pacemakers must be replaced every 5-7 years when the battery is depleted, and are therefore very expensive and inconvenient. Kalami said many patients have put on pacemakers since childhood and if this new technology is implemented, they will save a lot of trouble in their lives. "For children, they use pacemakers for many years. If they adopt this new technology, they will do less surgery."
The researchers first measured the heartbeat-induced vibrations in the chest, then used a "vibrator" in the laboratory to replicate and connected it to a prototype of the heart energy capture device they developed. Prototype device performance tests, based on 100 sets of simulated heartbeats with different heart rates, showed that more than 10 times more power was needed than pacemakers. The next step is to implant this energy capture device, which is only half the size of the battery used in current pacemakers.
Researchers have now developed linear and nonlinear cardiac energy capture devices that support conventional pacemakers. The linear device is only suitable for a specific heart rate, and changes in heart rate will prevent it from harvesting enough power. Non-linear devices use magnetic materials to increase power production and are no longer sensitive to changes in heart rate. The non-linear device can work in the heart rate range of 20 to 600 times per minute to harvest enough power to continuously power the pacemaker. Moreover, devices such as mobile phones or microwave ovens will not affect the normal operation of non-linear devices. (Reporter Feng Weidong Chang Lijun)
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