Stanford Wireless Cardiac Device Powered by Radio Waves, Not Batteries
September 4, 2012 6:16 PM
comment(s) - last by
Power delivery to the human heart from a 200MHz low-frequency transmitter (left) and a 1.7GHz high-frequency transmitter (right)
This could eliminate large pacemaker batteries that don't last forever
engineers have created a tiny, wireless cardiac device that can easily be implanted in the chest.
The Stanford researchers, including study leader Ada Poon and doctoral candidates Sanghoek Kim and John Ho, developed a cardiac
that is wirelessly powered by radio waves outside of the body instead of depending on a battery.
What's the problem with batteries? They're large -- often the largest part of a pacemaker device. Also, they don't last forever, so patients
must have surgery
to replace it when the battery stops working.
The new Stanford cardiac device is only eight-tenths of a millimeter in radius. This makes it non-invasive, and easy to place in the human chest. The device combines radiative and inductive transmission of power, allowing a transmitter to send radio waves to a coil in the body. An electrical current is created in the coil, which powers the tiny implant.
This particular wireless device is beating the odds, because electric fields dissipate in human tissues and scientists long thought that high frequency radio waves needed low-frequency transmitters and huge antennas in order to make implantable devices work. But Poon found another way: radio waves move in alternating waves of magnetic and electric fields, allowing high-frequency signals to penetrate human tissues much deeper.
With a 1.7 GHz high-frequency transmitter, the top power transfer through human tissue was able to hit about 1.7 billion cycles per second. This is 10 times that of current devices.
Challenges still lie ahead; such as problems with tissue heating and antenna placement for maximum efficiency (which could significantly reduce power if aligned incorrectly), but the new device is a promising step toward advanced, wireless pacemakers that are both small and powerful.
This article is over a month old, voting and posting comments is disabled
9/5/2012 7:43:01 AM
Sounds cool, but what happens when the person leaves the influence of the microwave field? How long would the device be able to supply current before the person needed a top up?
"Well, there may be a reason why they call them 'Mac' trucks! Windows machines will not be trucks." -- Microsoft CEO Steve Ballmer
Stanford Researchers Develop Wireless Retinal Implant
May 15, 2012, 12:55 PM
Stanford Creates Wireless, Self-Propelling Medical Implant
February 23, 2012, 1:03 PM
Device Successfully Used as Alternative to Open-Heart Surgery
February 4, 2011, 1:01 PM
Creationists are Mad About Google Doodle Depicting Evolution
November 24, 2015, 8:48 PM
DHS and TSA: Whoops, We Missed That 73 Airport Employees May be Terrorists
November 19, 2015, 2:16 PM
Star Wars Spinoff Film "Rogue One", Theme Park Attractions Announced
August 17, 2015, 12:20 PM
SpaceX Falcon 9's Seventh Supply Mission to ISS Ends w/ Fiery Stage 1 Explosion
June 28, 2015, 1:10 PM
Cool Science Video: Glowing Millipede Prowls the Nevada Desert
May 18, 2015, 12:00 PM
Newly Discovered Costa Rican Glass Frog is Kermit's Doppelgänger
April 22, 2015, 11:26 AM
Latest Blog Posts
Sceptre Airs 27", 120 Hz. 1080p Monitor/HDTV w/ 5 ms Response Time for $220
Dec 3, 2014, 10:32 PM
Costco Gives Employees Thanksgiving Off; Wal-Mart Leads "Black Thursday" Charge
Oct 29, 2014, 9:57 PM
"Bear Selfies" Fad Could Turn Deadly, Warn Nevada Wildlife Officials
Oct 28, 2014, 12:00 PM
The Surface Mini That Was Never Released Gets "Hands On" Treatment
Sep 26, 2014, 8:22 AM
ISIS Imposes Ban on Teaching Evolution in Iraq
Sep 17, 2014, 5:22 PM
More Blog Posts
Copyright 2016 DailyTech LLC. -
Terms, Conditions & Privacy Information