Reusing An Old Pacemaker As A Flash Timer

January 19, 2012 by Mike Nathan 26 Comments

pacemaker-flash-timer

Most people use pacemakers to, you know, keep their heart pumping at a steady rhythm. [David Prutchi] on the other hand has found a pretty novel use for some of the old pacemakers he has in his collection.

We really had no idea that pacemakers had uses outside the world of medicine, but [David] has taken advantage of their reliability in one of his favorite hobbies – high speed photography. In a darkened room, he set up an infrared barrier which feeds its signal to the atrium input of an old pacemaker. The signal is relayed through the ventricular output, which then fires his camera’s flash.

The pacemaker allows [David] to set an “AV” delay, which is the interval between when the atrium input receives an electrical impulse and when that signal is repeated from the ventricular output. This allows him to finely tune how much time elapses from when a drop of milk breaks the IR barrier to when his flash actuates.

We think this is a pretty cool way to reuse an old pacemaker, but check out the shots he has captured and judge for yourself.

See Through Everything With A Home Made X-ray

January 1, 2012 by Brian Benchoff 56 Comments

[Grenadier] built his very own x-ray machine. He’s no stranger to high voltage – we’ve seen his Jacob’s Ladders and Marx generators. Surely he can handle himself with high voltage and dangerous equipment. With this portable x-ray machine, [Grenadier] has begun overloading Geiger counters. We’re just happy he knows what he’s doing.

The key component of [Grenadier]’s portable x-ray machine is the Coolidge tube, a simple vacuum tube that produces x-rays with the help of 75 kilovolts of power. The finished build looks awesome. Two meters display the milliamps and kilovolts going to the x-ray tube, and a trio of nixies display the exposure time.

Even though [Grenadier] doesn’t have x-ray film, he can see through things with a scintillation screen that fluoresces when exposed to ionizing radiation. There are two pictures of the x-ray in action – one showing the inside of a pen and the guts of a hard drive (as shown in the title pic).

The output of the x-ray was measured with a Geiger counter. [Grenadier] was able to get a hit every second or so at 50 yards, and very loud white noise at 1 foot. Check out the video of [Grenadier]’s Buildlounge laser cutter contest submission after the break.

via Buildlounge

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[Ben Krasnow] Sticks LEDs In His Contacts Just For Kicks

December 20, 2011 by Mike Nathan 86 Comments

[Ben Krasnow] wrote in, saying that every so often a news story appears covering a project in which researchers embed a single pixel LED display inside a contact lens. The most recent article he saw featured a contact-wearing rabbit, and not being one to shy away from damaging his own body in the name of science, he decided to try the experiment on himself.

He started out by soldering a tiny 0402 SMD LED to a hand wound coil, laminating the display between a pair of regular contact lenses. After trying to adhere the lenses to one another using water, he opted to tack the edges together with a pair of hot tweezers, making for a more secure but uncomfortable piece of eyewear. The LED is powered by a simple inductive coil he put together, which uses a spark gap transmitter to flash the LED on and off.

If you’re not freaked out by people sticking things in their eyes, be sure to check out the video below to see [Ben’s] augmented contact lens in action. While it might not give him Terminator-like vision, it’s pretty awesome considering he pieced it together in his workshop in his spare time.

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Learn A New Fabrication Technique From DIY Prosthetics Builders

November 28, 2011 by Mike Szczys 21 Comments

This is a screenshot from a video tutorial on making your own prosthetic parts from 2-liter soda bottles. The opaque white part is a mold made of plaster. It’s a representation of the wearer’s limb, and provides the hard, heat-resistant form necessary for this manufacturing technique. You can see the clear plastic soda bottle which fits over the form after the bottom was removed. A heat gun causes the plastic to shrink to the shape of the plaster model.

Once formed, the threaded neck is split down the middle with a band saw. This will receive a piece of 1/2″ PVC pipe to be held in place by the neck and a pipe clamp. It’s possible to stop there, but a second video details an additional bottle used to make the device more rigid. See both videos after the break.

This manufacturing process is aimed at parts of the world that don’t have access to advanced prosthetics. We think it’s a wonderful demonstration of what can be done to improve the lives of amputees. We also think it’s a technique that can be used in other projects… we just haven’t figured out what those are as of yet.

It’s amazing how versatile this plastic waste can be if you put your mind to it.

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Dad Hacks Cerebral Palsy, Upgrades Son’s Lifestyle

November 11, 2011 by Brian Benchoff 44 Comments

[Jorge]’s son was born in 2004 after a troubling time in the womb. The son, [Ivo], wasn’t getting enough oxygen and unfortunately developed cerebral palsy. [Jorge] took it upon himself to improve his son’s life, so he got busy building some machinery for physical therapy. Today, [Ivo] is able to walk very well without the need for braces or other aids.

[Ivo] has a form of CP called Spastic quadriplegia. With [Ivo]’s disorder, his skeletal muscles are always tight meaning he’s nearly unable to walk. This can be treated with muscle relaxants such as Botox (yes, that Botox), but [Jorge] wanted to help out with his son’s physical therapy.

[Jorge] began preparing for [Ivo]’s physical therapy by building a “tripod” for him. This allows [Ivo] to stand while taking part in physical activities like ping-pong and golf. The second phase of the training was a modification to a cross-country skiing/elliptical trainer that allowed [Ivo] to practice walking. Today, [Ivo] is happily walking very well, a testament to his dad’s wishes that he has somewhat normal life. Some aluminum tubing helped, but we’re pinning this one on his dad.

Mimicing A Heartbeat In Sound And Electrical Pathways

November 4, 2011 by Mike Szczys 19 Comments

If you set a cardiac nurse loose on a Propeller microcontroller and some parts you might not know what to expect. But we’re intrigued by the outcome of this project which looks to mimic a heartbeat’s audible and electrical traits. The post about the project is in four parts which are not linked to each other, but you can find them all, as well as a video segment demonstrating the rig after the break.

It seems that this was intended as a Halloween project, but we don’t see why it wouldn’t be interesting any time of year. The Propeller demo board is used to mimic a heartbeat with a pulsing LED. But that doesn’t seem all that awesome, so the sounds of a heartbeat were added to the program to coincide with the blinky light. Here’s where the medical training comes in: the next phase of the process was to lay out an array of LEDs on a breadboard in the shape of the human heart’s electrical system. Now you’ve got a pulsing LED, heart sounds, and a lighted animation showing how the electricity travels through the organ.

To add a little [Poe] to the project there’s also a CdS light sensor. As you approach the project you block some light from getting to the sensor and the heart rate increases.

We think the next logical step is to add a heart rate sensor, so that this can illustrate what your own heart is doing. Boom! Another project ready for the Children’s museum.

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A Smartphone Dock For Your Arm? Why Not?

October 27, 2011 by Jeremy Cook 20 Comments

Why not that is, if you have a prosthetic arm. Although it’s hard to believe we haven’t seen this before, [Trevor Prideaux], according to [The Telegraph’s] article, “has become the world’s first ever patient to have a smartphone docking system built into his prosthetic arm.”

[Trevor] was born without a forearm, and, as he puts it, he’s used to adapting to things. However, he thought others might be struggling with the same problem, especially those that become disabled later in life. Once their help was secured, Nokia and the Exeter Mobility Centre got to work on his new limb and produced a prototype in five weeks!

[Trevor] is quite pleased with his new phone docking system. Texting especially is much easier and safer, and the phone can be removed when needed for making calls. We love to see hacks like this where people enhance their abilities using technology! For another hack helping those with disabilities, check out this wheelchair elevator/winch made for a non-accessible apartment.

via [reghardware.com]