An experimental device converts kinetic energy from beating hearts into electricity than can power a pacemaker, meaning the chance for no more batteries in the future, according to a talk at the American Heart Association's Scientific Sessions 2012.
The study is preliminary but a piezoelectric approach is promising for pacemakers because they require only small amounts of power to operate. Batteries must be replaced every five to seven years, which is costly and inconvenient. Piezoelectricity might also power other implantable cardiac devices like defibrillators, which also have minimal energy needs.
"Many of the patients are children who live with pacemakers for many years," said M. Amin Karami, Ph.D., lead author of the study and research fellow in the Department of Aerospace Engineering at the University of Michigan in Ann Arbor. "You can imagine how many operations they are spared if this new technology is implemented."
Researchers measured heartbeat-induced vibrations in the chest. Then, they used a "shaker" to reproduce the vibrations in the laboratory and connected it to a prototype cardiac energy harvester they developed. Measurements of the prototype's performance, based on sets of 100 simulated heartbeats at various heart rates, showed the energy harvester performed as the scientists had predicted — generating more than 10 times the power than modern pacemakers require. The next step will be implanting the energy harvester, which is about half the size of batteries now used in pacemakers, Karami said. Researchers hope to integrate their technology into commercial pacemakers.
Two types of energy harvesters can power a typical pacemaker: linear and nonlinear. Linear harvesters work well only at a specific heart rate, so heart rate changes prevent them from harvesting enough power.
In contrast, a nonlinear harvester, the type used in the study, uses magnets to enhance power production and make the harvester less sensitive to heart rate changes. The nonlinear harvester generated enough power from heartbeats ranging from 20 to 600 beats per minute to continuously power a pacemaker. Devices such as cell phones or microwave ovens would not affect the nonlinear device, Karami said.
- PHYSICAL SCIENCES
- EARTH SCIENCES
- LIFE SCIENCES
- SOCIAL SCIENCES
Subscribe to the newsletter
Stay in touch with the scientific world!
Know Science And Want To Write?
- Suggestion: The EM Drive Is Getting The Appropriate Level Of Attention From The Science Community
- Animal Sex Is Spicier Than We Thought
- Multi-Meter Sea Level Rise This Century? That's Not A Consensus
- What If We Can 'Pre-Diagnose' Autism In Babies?
- Bees: Activists Remain Silent While This Pollinator Killer Decimates Millions
- Bang! Meet The Highest-Energy Hadron Collision Ever Imaged!
- Will Aspartame Critics Now Be Less Bitter?
- "Lee Correy (G. Harry Stine)'s novel Star Driver? Seriously - this whole thing so far is *WAY* too..."
- "You might be just as pretentious as the, uh-hem white people, who claim to be Celiac without testing..."
- "I'd be interested to know more also. Probably details would be covered by military and commercial..."
- "Thanks, I saw that and was hoping that further clarification was available elsewhere. Sounds like..."
- "He says in the interview video at the start of the article. At 50 seconds in - though doesnt'give..."
- No excuses to be against science now: Monsanto patent expires
- The Pendulum Swings: Prescribing Hormone Replacement Therapy 13 Years After the Women’s Health Initiative Study
- The search for new blood donors ends at the living – but why?
- Television doctors under fire again
- Environmental activists are ignoring the real bee killer
- Gary Hirshberg: Organic yogurt guru’s credibility under attack