Featured Research

from universities, journals, and other organizations

Measuring The Next Successful Antennas For In-body Health Monitoring Devices

Date:
September 24, 2009
Source:
National Physical Laboratory
Summary:
Antennas for the latest implanted medical devices are being developed in the UK. In the near future, in-body medical devices such as pacemakers will use radio frequency (RF) technology to improve healthcare for patients. A low-powered, two-way wireless communications system linking an in-body device to a monitoring system can provide up-to-the minute patient data to allow doctors to adjust treatment as soon as it is needed.

This is the NPL Smart Chamber with Orbit roll over as positioner.
Credit: Image courtesy of National Physical Laboratory

Antennas for the latest implanted medical devices are being developed by Queen Mary University of London and tested through a unique piece of kit at the UK's National Physical Laboratory (NPL).

In the near future in-body medical devices such as pacemakers will use radio frequency (RF) technology to improve healthcare for patients. A low-powered, two-way wireless communications system linking an in-body device to a monitoring system can provide up-to-the minute patient data to allow doctors to adjust treatment as soon as it is needed. Devices will read data every night when the patient is asleep and send reports to the physician at the hospital, via the telephone system or Internet.

Antennas are vital to the operation of these systems. They need to be small, light, high performing but low-powered, have limited radiation directed at the wearer and be built into the implant. They also need to be made of a material that is biocompatible as well as a good electrical performer.

To ensure the wireless implants work with monitoring systems we need to be able to measure how the radio waves behave when transmitted. Coaxial cable is traditionally used to measure the performance of small electric antennas. However, electrically small antennas for wireless communications applications are can excite common mode currents on coaxial cables - producing unwanted radiation of common mode current and with it distorted results.

NPL , the UK's National Measurement Institute, has achieved a breakthrough in the non-invasive measurement of electrically small antennas. By connecting omni-directional antennas, to an optical fibre instead of a coaxial cable they were able to remove the effects of cable reflections and most notably the radiation of common mode current.

The system was put to the test by the Body-Centric Wireless Sensor Lab (BodyWiSe) at Queen Mary University of London led by Professor Yang Hao. Researchers Dr Marie Rajab, Dr George Palikaras and Andrea Sani have developed an implantable Radio Frequency Identification (RFID) tag made up of a PIFA antenna type that has been optimised to operate whilst embedded in an artificially fabricated three-layer structure representative of skin, fat and muscle.

The device was tested by both a standard coaxial cable and NPL's fibre optic set-up and the results were compared. The result showed that the use of the fibre optic system can significantly decrease measurement errors caused by flowing common mode currents, in this case by as much as 18 dB.

NPL's Martin Alexander, Principal Research Scientist, said:

"This breakthrough could help the development of the next generation of miniature in-body technology designed to save even more lives. NPL achieved it through a collaborative partnership with optical communications company Seikoh-giken. Together we developed a very small RF-optical converter which reproduces the RF signal in full and has a minimal effect on the antenna performance. A miniature RF-optical transducer enables an optical fibre connection to the antenna, thereby eliminating the large distortion associated with the unwanted radiation from a coaxial cable."


Story Source:

The above story is based on materials provided by National Physical Laboratory. Note: Materials may be edited for content and length.


Cite This Page:

National Physical Laboratory. "Measuring The Next Successful Antennas For In-body Health Monitoring Devices." ScienceDaily. ScienceDaily, 24 September 2009. <www.sciencedaily.com/releases/2009/09/090908103638.htm>.
National Physical Laboratory. (2009, September 24). Measuring The Next Successful Antennas For In-body Health Monitoring Devices. ScienceDaily. Retrieved October 22, 2014 from www.sciencedaily.com/releases/2009/09/090908103638.htm
National Physical Laboratory. "Measuring The Next Successful Antennas For In-body Health Monitoring Devices." ScienceDaily. www.sciencedaily.com/releases/2009/09/090908103638.htm (accessed October 22, 2014).

Share This



More Matter & Energy News

Wednesday, October 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Internet of Things Aims to Smarten Your Life

Internet of Things Aims to Smarten Your Life

AP (Oct. 22, 2014) As more and more Bluetooth-enabled devices are reaching consumers, developers are busy connecting them together as part of the Internet of Things. (Oct. 22) Video provided by AP
Powered by NewsLook.com
Thanks, Marty McFly! Hoverboards Could Be Coming In 2015

Thanks, Marty McFly! Hoverboards Could Be Coming In 2015

Newsy (Oct. 21, 2014) If you've ever watched "Back to the Future Part II" and wanted to get your hands on a hoverboard, well, you might soon be in luck. Video provided by Newsy
Powered by NewsLook.com
Robots to Fly Planes Where Humans Can't

Robots to Fly Planes Where Humans Can't

Reuters - Innovations Video Online (Oct. 21, 2014) Researchers in South Korea are developing a robotic pilot that could potentially replace humans in the cockpit. Unlike drones and autopilot programs which are configured for specific aircraft, the robots' humanoid design will allow it to fly any type of plane with no additional sensors. Ben Gruber reports. Video provided by Reuters
Powered by NewsLook.com
Graphene Paint Offers Rust-Free Future

Graphene Paint Offers Rust-Free Future

Reuters - Innovations Video Online (Oct. 21, 2014) British scientists have developed a prototype graphene paint that can make coatings which are resistant to liquids, gases, and chemicals. The team says the paint could have a variety of uses, from stopping ships rusting to keeping food fresher for longer. Jim Drury 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:

Strange & Offbeat Stories


Space & Time

Matter & Energy

Computers & Math

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