Featured Research

from universities, journals, and other organizations

Medical implants: Tune in, turn on, power up

Date:
December 4, 2013
Source:
Acoustical Society of America (ASA)
Summary:
Human beings don’t come with power sockets, but a growing numbers of us have medical implants that run off electricity. To keep our bionic body parts from powering down, a group of researchers is developing a safe, noninvasive, and efficient means of wireless power transmission through body tissue.

Human beings don’t come with power sockets, but a growing numbers of us have medical implants that run off electricity. To keep our bionic body parts from powering down, a group of Arizona researchers is developing a safe, noninvasive, and efficient means of wireless power transmission through body tissue. The team presents their findings at the 166th meeting of the Acoustical Society of America, held Dec. 2 – 6 in San Francisco, Calif.

Medical implants treat a variety of conditions such as chronic pain, Parkinson's disease, deep brain tremors, heart rhythm disturbances, and nerve and muscle disorders. If the batteries in the devices lose their charge, minor surgery is needed to replace them, causing discomfort, introducing the risk of infection, and increasing the cost of treatment.

This is a scenario the Arizona researchers are aiming to change.

Their novel wireless power approach is based on piezoelectric generation of ultrasound. The Greek root, "piezo", means "squeeze." In piezoelectrical systems, materials are squeezed or stressed to produce a voltage. In turn, applied voltages can cause compression or extension. Piezoelectric materials have specific crystalline structures. The team's piezoelectric system has been tested in animal tissue with encouraging results.

"The goal of this approach is wireless power transmission to human implantable power generators (IPGs),” explained lead researcher Leon J. Radziemski of Tucson-based Piezo Energy Technologies. “Charging experiments were performed on 4.1 Volt medical-grade lithium-ion batteries. Currents of 300 milliamperes (mA) have been delivered across tissue depths of up to 1.5 centimeters. At depths of 5 centimeters, 20 mA were delivered. Currents such as these can service most medical-grade rechargeable batteries."

With Dr. Inder Makin, an experienced ultrasound researcher, the team has tested the device in pigs to demonstrate safe charging over several hours of ultrasound exposure. The system works like this: A source such as a wall plug or battery powers the transmitter. Ultrasound passes from the transmitter through the intervening tissue to the implanted IPG housing the piezoelectric receiver. After positioning the transmitter, the patient can control the procedure from a hand-held device that communicates with the implant. When charging is complete, the implant signals this and turns off the transmitter.

Wireless recharging transmission has been tried before using a different technology, electromagnetic recharging. Given the proliferation of battery-powered medical implanted therapies, the Radziemski team sees an emerging and expanding need for increased rechargeable power options.

"Ultrasound rechargeable batteries can extend the time between replacements considerably, reducing health care costs and patient concerns," Radziemski said. The next step involves further testing and development in hopes of commercializing the technology within two to five years.


Story Source:

The above story is based on materials provided by Acoustical Society of America (ASA). Note: Materials may be edited for content and length.


Cite This Page:

Acoustical Society of America (ASA). "Medical implants: Tune in, turn on, power up." ScienceDaily. ScienceDaily, 4 December 2013. <www.sciencedaily.com/releases/2013/12/131204181235.htm>.
Acoustical Society of America (ASA). (2013, December 4). Medical implants: Tune in, turn on, power up. ScienceDaily. Retrieved September 17, 2014 from www.sciencedaily.com/releases/2013/12/131204181235.htm
Acoustical Society of America (ASA). "Medical implants: Tune in, turn on, power up." ScienceDaily. www.sciencedaily.com/releases/2013/12/131204181235.htm (accessed September 17, 2014).

Share This



More Matter & Energy News

Wednesday, September 17, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Space Race Pits Bezos Vs Musk

Space Race Pits Bezos Vs Musk

Reuters - Business Video Online (Sep. 16, 2014) Amazon CEO Jeff Bezos' startup will team up with Boeing and Lockheed to develop rocket engines as Elon Musk races to have his rockets certified. Fred Katayama reports. Video provided by Reuters
Powered by NewsLook.com
MIT's Robot Cheetah Unleashed — Can Now Run, Jump Freely

MIT's Robot Cheetah Unleashed — Can Now Run, Jump Freely

Newsy (Sep. 16, 2014) MIT developed a robot modeled after a cheetah. It can run up to speeds of 10 mph, though researchers estimate it will eventually reach 30 mph. Video provided by Newsy
Powered by NewsLook.com
Manufacturer Prints 3-D Car In Record Time

Manufacturer Prints 3-D Car In Record Time

Newsy (Sep. 15, 2014) Automobile manufacturer Local Motors created a drivable electric car using a 3-D printer. Printing the body only took 44 hours. Video provided by Newsy
Powered by NewsLook.com
Refurbished New York Subway Tunnel Unveiled After Sandy Damage

Refurbished New York Subway Tunnel Unveiled After Sandy Damage

Reuters - US Online Video (Sep. 15, 2014) New York officials unveil subway tunnels that were refurbished after Superstorm Sandy. Nathan Frandino reports. Video provided by Reuters
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

    Technology News



    Save/Print:
    Share:

    Free Subscriptions


    Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

    Get Social & Mobile


    Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

    Have Feedback?


    Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
    Mobile: iPhone Android Web
    Follow: Facebook Twitter Google+
    Subscribe: RSS Feeds Email Newsletters
    Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins