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Wirelessly powered, self-propelled medical device  (Source: Carlos Suarez, StrongBox3d)
Implant could eventually be used in applications like diagnostics, minimally invasive surgeries and drug delivery

A Stanford University researcher has developed new wireless medical devices that can be implanted or injected into the human body. 

Ada Poon, study leader and assistant professor from Stanford University, has created a wireless medical device capable of traveling through the bloodstream without cables or a battery. 

Traditional implantable medical devices used today are limited due to power problems. More specifically, the batteries needed to power such devices are bulky. While other researchers have managed to make these batteries in devices smaller, they've had to compromise power as well. This is problematic because the batteries would often have to be replaced, and there are also risks associated with battery corrosion or broken wires.

That's exactly why Poon created devices that do not require batteries or cables. The implantable/injectable devices consist of a radio transmitter, which is kept outside of the body and communicates with an antenna of coiled wire on the device. The antenna and transmitter are magnetically coupled, so a change in current flow in the transmitter induces a voltage in the coiled wire. This powers the device wirelessly, allowing it to make its way through the bloodstream.

Poon was able to do what many others couldn't because instead of looking at human fat, muscle and bone as good conductors of electricity, she found that it's a better insulator instead. Using new equations, she discovered that human tissue is actually a poor conductor of electricity, and that high-frequency radio waves move easily through the fat, muscle and bone.

"When we extended things to higher frequencies using a simple model of tissue, we realized that the optimal frequency for wireless powering is actually around one gigahertz -- about 100 times higher than previously thought," said Poon.

Poon has created two devices: one that switches current back and forth in a wire loop to make a "swishing" motion, and another that drives electrical current through the liquid to create a "directional force."

Poon said it would be a while before these devices can be used in hospitals, but could eventually be used in applications like diagnostics, minimally invasive surgeries and drug delivery.

Source: Science Daily



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Anyone can explain this?
By Hakuryu on 2/23/2012 3:57:17 PM , Rating: 2
quote:
The antenna and transmitter are magnetically coupled, so a change in current flow in the transmitter induces a voltage in the coiled wire.


I've never heard of wireless power, and from the quote above, it sounds like something easy. Why isn't this in everything? Like a car phone charger that just sits in the car and recharges your phone without actually connecting it.

Someone care to explain?




RE: Anyone can explain this?
By ppardee on 2/23/2012 4:30:41 PM , Rating: 3
It is very simple in concept. It works the same way a step up/down transformer does. But it is (much?) less efficient than plugging in. There are cell phone chargers that you can buy that utilize this, but they have to be adapted to your specific phone model... I think they replace a battery with one that has the coil integrated with it.

This is something that I'd like to see in electric cars... put the coil on/in your garage floor and when the car is parked over it, it charges the car without any intervention from the driver.

There are concerns, though, about the field affecting other things... I've heard (but not researched) that these things mess with pacemakers.


RE: Anyone can explain this?
By Black1969ta on 2/24/2012 3:32:42 AM , Rating: 3
You can buy wireless chargers at Best Buy both for cell phones and even the Wii mote has a wireless charger accessory available, this is call inductive charging.

Oklahoma has a stretch of road that has wires buried that were designed to inductively charge an EV Battery while it drove, to give longer distance, but this was back in the '90s. they still talk about inductive charging powered by Solar cell raised above the roadbed, both charging batteries and providing shade that reduces energy needed to cool (A/C) cars in the summer.


RE: Anyone can explain this?
By pburghdoom on 2/24/2012 8:27:25 AM , Rating: 2
Some companies are working on advancing this and making it more usable in day to day life. I saw a TED talk from a company that formed out of research done at MIT called WiTricity.

http://witricity.com/

http://www.ted.com/talks/eric_giler_demos_wireless...


RE: Anyone can explain this?
By JediJeb on 2/24/2012 3:34:59 PM , Rating: 2
quote:
I've never heard of wireless power,


For those that haven't heard of wireless power, do a search on Nikola Tesla. He had theories on wireless power transmission as far back as the 1890s.

http://en.wikipedia.org/wiki/Nikola_Tesla


RE: Anyone can explain this?
By Jaybus on 2/27/2012 7:59:30 AM , Rating: 2
It wasn't just a theory. He demonstrated wireless power distribution in 1891. A company was actually formed and a distribution tower was built, though I believe the company went bust before anything was completed.


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