Dyson Award Goes To Emergency Medical Device For Treating Stab Wounds

August 29, 2021 by Al Williams 68 Comments

[Joseph Bentley] must be one of those people who sees opportunity in problems. He had several friends who were victims of knife attacks, so he developed REACT, a device that would allow police or other first responders to quickly help victims of stab wounds. The project won the Dyson award and you can see the video about it, below.

The device has two parts: a medical-grade silicone sleeve and a handheld actuator. The sleeve actually inserts into the stab wound and the actuator pressurizes the sleeve based on the location of the wound. The actuator has a user interface to allow the operator to select the area of the body affected.

We don’t know much about emergency medicine, but apparently, the current method is to apply pressure externally and this doesn’t do much for internal bleeding. The sleeve solves that and [Bentley] thinks the device can save many lives if brought to market. Of course, getting a medical device actually on the market is a long road fraught with regulatory peril. We hope the Dyson award will help [Bentley] get the product in the hands of people who can use it to good purpose.

We are very interested in replacing damaged body parts, but saving people from losing body parts or life is good, too. Sometimes, just calling for help is worthwhile.

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Nokia LCD Goes Transparent For Hands-Free Reminders

August 29, 2021 by Tom Nardi 1 Comment

These days everyone’s excited about transparent OLED panels, but where’s the love for the classic Nokia 5110 LCD? As the prolific [Nick Bild] demonstrates in his latest creation, all you’ve got to do is peel the backing off the the late 90s era display, and you’ve got yourself a see-through cyberpunk screen for a couple bucks.

In this case, [Nick] has attached the modified display to a pair of frames, and used an Adafruit QT Py microcontroller to connect it to the ESP32 powered ESP-EYE development board and OV2640 camera module. This lets him detect QR codes within the wearer’s field of vision and run a TensorFlow Lite neural network right on the hardware. Power is provided by a 2000 mAh LiPo battery running through an Adafruit PowerBoost 500.

The project, intended to provide augmented reality reminders for medical professionals, uses the QR codes to look up patient and medication information. Right now the neural network is being used to detect when the wearer has washed their hands, but obviously the training model could be switched out for something different as needed. By combining these information sources, the wearable can do things like warn the physician if a patient is allergic to the medication they’re currently looking at.

Relevant information and warnings are displayed on the Nokia LCD, which has been placed far enough away from the eye that the user can actually read the text; an important design consideration that [Zach Freedman] demonstrated with his (intentionally) illegible wearable display a few weeks back. That does make the design a bit…ungainly, but at least you don’t have to worry about hand-cutting your optics

Hackaday Links: August 29, 2021

August 29, 2021 by Dan Maloney 14 Comments

If you thought that COVID-19 couldn’t possibly impact space travel, think again. The ongoing pandemic is having unexpected consequences for companies like SpaceX, who are worried about liquid oxygen shortages due to increased demand for medical oxygen. Massive amounts of liquid oxygen are used as the oxidizer for each rocket launch, of course, as well as in hospitals, which have giant tanks of liquid oxygen somewhere on site. Whether destined for space or for patient care, liquid oxygen comes from cryogenic separation plants, and SpaceX fears that they would have to delay or even cancel launches if manufacturers can’t keep up with demand and have to prioritize their healthcare customers. We’re actually not sure if this is a concern, though, since there are usually separate supply chains for medical and industrial gasses. Then again, we’d suspect a rocket engine might prefer to breathe ultra-pure LOX too.

Speaking of space, if you want to be an astronaut, perhaps the first skill you need to develop is patience. Not only might your ride not be ready to go when you are, but at least in the EU, you’ve got a long line of applicants in front of you. The European Space Agency announced this week that they’re working through a backlog of 23,000 applications for astronaut positions. About 20% of those will apparently be dropped in the pre-screening process, but the rest will (eventually) get an invitation to a full-day test at one of the ESA’s facilities. We imagine the attrition rate from there increases dramatically; either that or the ESA intends to hire a lot of astronauts.

Back here on Earth, Google this week did what it seems to do a lot of, and killed off one of its popular apps. This time the victim is the Android Auto phone app, although we have to admit the whole thing is confusing. The app allows you to connect your phone to the infotainment system in a compatible late-model car, letting you access all your apps without having to fiddle with your phone while driving. But Google also had an app that offered the same experience directly on the phone, for cars without a compatible display. As far as we can tell, the on-phone app is the only thing that’s going away in Android 12; the app for in-car displays will continue to be supported. Former users of the phone-only app are being encouraged to migrate to Google Assistant’s Driving Mode. Or, you know, you could just drive the car instead.

So your brand-new video card is running hot, and you can’t figure out why. At your wit’s end, you crack open the card’s cover and find the reason — a somewhat suspicious-looking foreign object. That’s what happened to Antony ter Horst and his Nvidia RTX 3090, which had a finger cot wedged inside it. It would appear to have slipped off the finger of some assembly worker, and it was clearly interfering with heat flow inside the card. Antony posted the pictures on reddit, which of course found much humor in the finger cot’s resemblance to another latex object. For our part, it put us in mind of some other stories of foreign objects found in common products — there’s a reason why we always check a loaf of bread before using it.

And finally, in a lot of ways YouTube has become the new “vast wasteland” of useless content. But like television before it, there are occasional gems to be found, especially to those of us who love to learn a little something as we watch. And so when we stumbled upon a video with the title “Hot Tap and Stopple Bypass at Smoky Lake” we had to check it out just to find out what each of those words meant. It turned out to be a great video on pipeline construction methods. The “hot tap” refers to cutting into the pipeline, containing high-pressure diluted bitumen from the shale oil fields near Smoky Lake, Alberta, without interrupting the flow of product. The “stopple” is a device that can be threaded into the pipe to permanently seal it, diverting the flow to a newly installed bypass. The whole process is fascinating, so we thought we’d share. Enjoy.

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Bake It To ReMake It: Cooking Old Magnetic Tape To Recover Data

August 29, 2021 by Dave Rowntree 12 Comments

Those of us old enough may remember the heyday of the text adventure game genre from the first time around. London-based Magnetic Scrolls was an early pioneering company producing titles for the first Amiga and Atari ST platforms. Fast-forward to 2017 and [Hugh Steers], the original co-founder and core developer for Magnetic Scrolls has formed an initiative to revive and re-release the original games on modern platforms. Since the 1980s-era DEC MicroVAX used originally for development is not particularly rare in retro computing circles, and media containing source code was found in someone’s loft space, reviving the games was not a tall order.

First, he needed to recover a copy of the original source code from the backup tapes. But there was a problem, it turns out that the decaying tapes used a unstable polyurethane-based binder to stick the oxide material (which is what stores the data) to the backing tape, and this binder can absorb water over the years.

Not much happens until you try to read the tape, then you trip over the so-called sticky-shed syndrome. Secondly you may find that a small amount of the oxide layer sheds from the tape, coating the read head, rollers and guides inside the complicated tape mechanism. This quickly results in it gumming up, and jamming, potentially chewing up the tape and destroying it permanently.

This was further exacerbated by the behaviour of the DEC TK50Z tape drive, which needed to shuttle the whole length of the tape as part of its normal operation.

A temporary solution was to bake the tape in an oven to drive out the moisture and reduce the stickiness enough to run it through the drive safely. Then only the oxide-shedding problem remained. The TK50Z drive was swapped for a TZ30 which shuttles the tape less, but also critically with a simple hack, would allow the heads to be cleaned with IPA between read passes. This was enough to keep the gumming up at bay and allow enough data to be read from the tapes to recover several games worth of code, ready for the re-releasing process.

The video after the break shows [Rob Jarratt] working through the process of the data recovery.

Continue reading “Bake It To ReMake It: Cooking Old Magnetic Tape To Recover Data” →

an image of the mechanism used to move the curtains

Clever Mechanism Easily Automates Pulling The Blinds

August 29, 2021 by Jim Heaney 15 Comments

There are few things that we all can agree we hate, and the shrill of your alarm clock waking you from a wonderful slumber is definitely high on that list. To wake up more naturally, [nutstobutts] created an automated curtain opener.

The curtain opener is very simple; a stepper motor in the control box pulls a string, which is run to an idler on the far side of the curtain rod and through two clips, attached to the back of each curtain. This design makes it so that both curtains will open smoothly at the same time, and will always come closed again directly in the center. This design is especially favorable for students in dorms or those that live in an apartment, as the installation requires no screws in the wall or permanent modification to the curtains.

The curtains can be opened and closed either by pressing a button on the control box or by sending HTTP requests to the ESP32 that controls everything. This allows for integration with many different IoT systems, for instance [nutstobutts] has been having Home Assistant open the curtains every morning at 6:30 a.m. in lieu of an alarm clock, and then closing them automatically at 9:00 a.m. to help save on cooling costs.

Automated curtains are a great first IoT project if you are looking to just get your feet wet, check out a different style we covered a few months back for more inspiration!

[via r/functionalprint]

DIY Machine Enables PEMF Therapy On A Budget

August 29, 2021 by Tom Nardi 48 Comments

We’re certainly not qualified to say whether or not pulsed electromagnetic field (PEMF) therapy will actually reduce your stress or improve your circulation, but there seems to be enough legitimate research going on out there that it might be worth a shot. After all, unless you’ve got a pacemaker or other medical implant, it seems pretty unlikely a magnetic field is going to make anything worse. Unfortunately commercial PEMF machines can cost thousands of dollars, making it a fairly expensive gamble.

But what if you could build one for as little as $10 USD? That’s the idea behind the simple DIY PEMF machine [mircemk] has been working on, and judging by its ability to launch bits of metal in the video below, we’re pretty confident it’s indeed producing a fairly powerful electromagnetic field. Even if it doesn’t cure what ails you, it should make an interesting conversation piece around the hackerspace.

While the outside of the machine might look a bit imposing, the internals really are exceptionally straightforward. There’s an old laptop power supply providing 19 VDC, a dual-MOSFET board, a potentiometer, and a simple signal generator. The pulses from the signal generator trip the MOSFET, which in turn dumps the output of the laptop power supply into a user-wound coil. [mircemk] has a 17 cm (6.7 inch) open air version wrapped with 200 turns of copper wire used for treating wide areas, and an 8 cm (3 inch) diameter version with 300 windings for when you need more targeted energy.

Some skepticism is always in order with these sort of medicinal claims, but commercial PEMF machines do get prescribed to users to help promote bone growth and healing, so the concept itself is perhaps not as outlandish as it might seem.

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The Curious Case Of The Radio Amateur And The Insulin Pump

August 29, 2021 by Jenny List 93 Comments

A substantial part of gaining and holding an amateur radio licence relates to the prevention of radio interference. In days past this meant interference to analogue television broadcasts, but with ever more complex devices becoming commonplace in homes it applies to much more. This has hit the news in Marion County Florida, where a radio amateur in a senior’s community has shut down his radio station after a potential link emerged between it and another resident’s insulin pump. There is a legal challenge ongoing that relates to the complex’s rules over transmitting antennas.

It’s obviously a serious occurrence for an insulin pump to be affected by anything, and it sounds as though the radio amateur concerned has done the right thing. But it’s clear that something has gone badly wrong in this case whether it’s due to the amateur radio transmissions or not, because for a manufacturer to produce a medical device so easily affected by RF fields should be of concern to everyone. We’d hope that the FCC might take an interest in this story and get to the bottom of it in an impartial manner, because whether it’s the radio amateur at fault, the insulin pump, or something else entirely, it presents a risk to anyone dependent upon such a device.

Perhaps this might also be a case for the ARRL, as we’ve reported before they have some form when it comes to radio investigations.

[Main image source: MailariX, CC-BY-SA 4.0]