Piezoelectric cantilever generates power for heart implant: Page 3 of 3

April 25, 2019 //By Bill Schweber
piezoelectric energy harvesting
Researchers have developed a piezoelectric energy harvesting transducer for medical implants, such as pacemakers, using the normal motion of blood vessels.

For comparison, today’s ultra-low-power implantable biomedical devices require 0.3μW for cardiac-activity sensing, 10 to 100 μW for pacemakers, 100 to 2000 μW for cochlear implants, and 1 to 10 mW for neural recording. An advantage of this design is that it’s scalable: two (or more) units can be connected in parallel for a corresponding increase in power output. Initial testing is done using a mechanical shaker, of course, to simulate the motion of the myocardium and the corresponding deformation of a pacemaker lead – see figure 3.

Fig. 3: This test setup is based on reported anatomical values of an average adult’s
cardiovascular system; a 21-cm long soft tube was used to represent the superior vena
cava (SVC) (A). The shaker-based test platform simulates the motion of myocardium (B).
(Source: Thayer School of Engineering at Dartmouth College).

This article was first published in Electronic Design - www.electronicdesign.com

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