Abstract 15551: Vibration Powered Cardiac Rhythm Devices
Introduction Because cardiac Implanted Electrical Devices (CIED) are powered by batteries they must be surgically replaced every 5 to 10 years. Piezoelectric energy harvesting is a new engineering field; nonlinear piezoelectric harvesters (NPH) convert ambient vibrations to electrical energy and from vibrations in the chest can produce power greater than the 1 microWatt required for CIED function. While traditional harvesters capture vibrations in a narrow frequency range, NPH incorporate magnets can be optimized for a complex and specific frequency content.
Hypothesis We present preliminary evidence regarding the use of a PH to supplement battery power in CIEDs.
Methods PH dimensions are 27mm x 27mm, approximately half the size of the batteries used in current CIEDs. Echocardiographic images of adult cardiac wall motion were analyzed to obtain an estimate of heartbeat induced vibrations. A mechanical shaker was instrumented to accurately reproduce the heart beat induced vibrations. The NPH, optimized through analytical studies, was then mounted on the shaker and its power output recorded over 100 heart beats at a range of heart rates.
Results Both linear and nonlinear piezoelectric harvester designs can by this model generate sufficient power at physiologic heart rate for typical pacemaker functions. NPH robustly generate power over a large range of heart rates, superior to linear harvesters
Conclusions The power generated by the developed energy harvester is more than 10 times the power required by the pacemaker. The harvester generates sufficient power if the heart rate is between 20 and 600 bpm. This proves that the piezoelectric energy harvesters can continuously power pacemakers. Development of this technology promises to decrease size and increase longevity and functionality of CIEDs.
- © 2012 by American Heart Association, Inc.