Everyday Prosthetic Fingers

Everyday Prosthetic Fingers Everyday Prosthetic Fingers Everyday Prosthetic FingersIn a former life, Dan Didrick fabricated cosmetic handglieds. The key word in that phrase is cosmetic.The fingers were only a silicon cap that doesnt bend, Didrick said. We call them Sunday fingers because you wear them to church or dinner and then throw them in a drawer for the week.Bedeviled by the cosmetic fingers shortcomings, he invented X-Finger, surgical steel fingers that move, flex, and grasp, just like the wearers original fingers.You can move them as quickly as you can move your prior finger plus because its common to flex your finger from open to closed and the X Finger follows motion of a residual finger, theres no learning curve, Didrick said. A patient can use the device right away after putting it on. They could immediately catch a tossed tanzabend that they see from the corner of their eye.Along the 10-year path since his first prototype, Didrick patented the devicewhich uses no electr onicshimself, sought and received coverage from all major medical insurers for the fingers, and taught himself computer-aided design (CAD). That last bit, he said, welches the easiest.A huge proportion of nonfatal accidental amputations involve fingers. The U.S. Bureau of Labor Statistics estimates that finger losses account for about 94% of job-related amputations.So Didrickwho got his start in prosthethics as a child, by using materials from his fathers dental office to make movie-quality monster masksput his skills to use fabricating prosthetic fingers.But his world, and his job, changed when he met a man who had lost several fingers in an accident and who welches deaf. The loss of the fingers made it impossible to communicate in sign language.I started by actually carving components out of wood and assembling them into reciprocating series of components that, through leverages, force the mechanics in the shape of a finger to move from a straight to a bent position from straight to a fist, Didrick said.Many amputees retain part of their finger. So the device, when fitted over the hand and the residual finger or fingers, lets a patient move his or her X-Finger by moving the residual finger from extended to bent.X-Fingers, invented by Dan Didrick, are prosthetic fingers that can be manipulated by wearers through use of their residual finger or fingers. The device lets them regain full use of their finger or fingers.So I came up with the assembly, but I was just carving them out of wood, Didrick said. Then I started seeking out design engineers. Thats when I realized it can cost tens of thousands of dollars to have a design engineer create an assembly of this nature.Though he had majored in business in college, Didrick rose to this first challenge as he would rise to many others while launching X-Finger. He simply bought a CAD packageSolidWorks, from the company in Concord, MAand quickly ran through the tutorial.Then I just started designing the components, he said. It only took about two weeks to get the first design. I shipped those to a manufacturer and they replicated them using an EDM machine and sent back components.Because all amputation cases are different, Didrick went on to develop what he called an erector set of parts that could be assembled into more than 500 different configurations. That number is likely much higher than 500, but once I got that high, I became confused counting them, he said.The device is composed of stainless steel, with a plastic cap that sits on the tip of the finger and anotlageher bit of plastic that sits at the flange. This is covered with a thermoplastic cosmetic skin that is soft and resists tearing. Think of what an artificial fishing worm feels like and how it can stretch.We actually contacted a company that was doing a job for the military, and theyd formulated thermoplastic to the same durometer reading as menschenfreundlich skin so its almost eerie to touch it, in that it feels like skin, Didr ick said.Each finger contains 23 moving parts, though depending on the complexity of the casesuch as whether the wearer retains a residual finger or notit could contain more. For those without residual fingers, a wire runs into the webbing between the fingers to receive open and flex impulses. The device is attached to the wrist and fitted over the hand and the residual fingers.It was really challenging replacing the ring and middle finger. The joint that controls those residual fingers is in your hand, Didrick said. But in this case it needs a probe that goes down into the webbing between the fingers to be controlled by that joint.For those who have lost four fingers, the device allows the movement of the palm to control all the artificial fingers.Post EngineeringThough hed invented the worlds first active prosthetic finger (the passive type is the cosmetic Sunday finger), Didrick, who now owns Didrick Medical of Naples, FL, was still an industry outsider.He bought a book called Pa tent It Yourself by David Pressman (1979 McGraw-Hill and since updated) and spent a year writing his own patent.Once the device was patented, FDA representatives and some online help taught him how to write a 513(d) document necessary for device evaluation. Didrick sent his evaluation to the agency and soon received a positive response. X-Fingers (the plural, used when the device contains more than one finger) had been registered with the FDA.The next step was receiving insurance approval for the fingers. After he won approval from the FDA, he went on to get approval from all major insurance companies, which now cover X-Fingers.From there, the device began taking off. The need was great, Didrick said. Many amputees had been awaiting something like this.Whats little realized, he said, is how many children lose fingers. The largest group of people who lose fingers outside the workplace are children under five, who undergo finger amputation due to accidents like slamming them in a car door.He also has learned that one out of 200 people will lose one or more fingers within their lifetime. That statistic takes into account people living all over the world.Its not only machinists who lose fingers, Didrick said.Because his device is powered by the body, literally the wearer is flexing and bending his hand.You can see a video demonstration of the X-Finger here.Many of Didricks customers pay a deposit in advance, which helps finance the four-employee company and its continued innovations.Whats New and Next?After his initial success, Didrick began routinely traveling to the Brooke Army Medical Center in San Antonio and to the Walter Reed Army Medical Center in Washington, DC, to fit wounded soldiers. He has also has fitted British soldiers with the device.The U.S. Department of Defense asked him to design an artificial thumb, which he has also done. Its not surprisingly called the X-Thumb.Hes now at work on a thin glove that would enable those with paralyzed hands who r etain some mobility in the wrist to use that mobility to control their hands.Didrick is also trying to help children whose insurance companies deny them coverage because they grow out of their prosthetics too fast. The costs of producing childrens X-Fingers are high because of the variation in injuries and finger dimensions in smaller fingers and hands. Hes recently established the nonprofit 501(c)(3) organization, World greifhand Foundation, to cover costs to provide X-Fingers for those who cannot afford to pay for them.And hes still using his original CAD package.If we needed the funds to hire a professional design team wed never be able to do this, Didrick said.You can move them as quickly as you can move your prior finger plus because...the X-Finger follows the motion of a residual finger, theres no learning curve.Dan Didrick, X-Fingers Inventor

Ice Fishing from Your Vehicle

Ice Fishing from Your Vehicle Ice Fishing from Your Vehicle Lets face it one of the big complaints about ice fishing would be that its...uh...cold. Well, how about just driving to the spot you like, parking, and fishing in your vehicle at a comfortable 72 degrees? The SnoBear is a track system vehicle that can hit 20+ mph and allows you to not only fish in toasty conditions, but, just as importantly, quickly move to the next spot if there isnt anything biting.Moving on tracks made of Camoplast, the body is fiberglass on the outer shell and has solid foam for warmth. The motor is actually a 1.6-liter Hyundai. The original version, however, had a Daihatsu 3-cylinder, according to engineer Tom Lykken, the original designer.Mario Nozzarella, general manager of SnoBear USA, Fargo, ND, explains that one of the keys to the design is that the PSI of the tires is less than one. Obviously the more pressure on the ice, the more apt that it will go through it, Nozzarella says. Another element is the Acralift System the hydraulics, which will raise and lower the vehicle so when you drive out on the ice you can push a button that retracts the tracks and it lowers it down a foot. It lets you platzdeckchen flat on the ice and when you draw your holes, then you are closer to the water. Instead of two or three feet off the ice, youre within 10 inches instead.For added safety, the tracks distribute the weight of the vehicle to less than one pound per square inch. Image SnoBearThe brake system is a key aspect of steering, an independent brake on each track, two pedals side by side and small enough to push both of them down with your foot, Nozzarella says. If you push down on your foot, we have a disc brake on each side of the track and can stop both tracks, Nozzarella says. If in a tight turn, you can push on the brake on one side and turn the ski. It can turn around on a dime.The SnoBear website explains that the track systems suspension prevents the front tracks from lifting by always balancing the forces across the face of the track belt. This cancels any front lift effect due to drive line torque, no matter how much power applied, maximizing flotation and traction.Even though the vehicle can hit the 20s in mph, Lykken says most of the time, it wont even be used past 15 mph. You wouldnt really have many people thinking about going faster, Lykken says. Unless youre going on those 20 mile trips on Minnesota lakes.For improving comfort, there is a small propane furnace and youll find the thermostat control can have it set for 70+ degrees even if 40 below, Nozzarella says.Lykken, who today is an innovation manager at Titan Machinery, focusing on planters farm equipment, says the response was strong to the product partly because of the passion for the hobby. There are people who are very serious about fishing and you can do it for as much as six months out here in Fargo, Lykken says. This allows them to enjoy it without getting coldand they can bring their fri ends.Eric Butterman is an independent writer. For Further DiscussionThere are people who are very serious about fishing and you can do it for as much as six months out here in Fargo. This allows them to enjoy it without getting cold.Tom Lykken, designer, SnoBear

Study Taking a 5-day Facebook vacation reduces stress levels

Study Taking a 5-day Facebook vacation reduces stress levelsStudy Taking a 5-day Facebook vacation reduces stress levelsSpring is finally here, and for many, this is the time to start planning their summer vacations. But instead of waiting for the warmer weather to arrive, theres a break you can take right now that will help you de-stress a Face-break.A new study published this month in theThe Journal of Social Psychology concludes that a short-term hiatus from Facebook can help combat stress.Researchers from the School of Psychology at the University of Queensland in Australia sought out to answer if taking a break from the social media giant would elicit changes in stress and well-being and measured the perceived stress and well-being of 138 active Facebook users with an average daily use of 2.8 hours. The participants were randomly instructed to either continue using Facebook as usual or take a five-day break from the site.Those who took the hiatus showed lower levels of the stres s hormone cortisol compared to those who continuednormal Facebook use. This suggests that the typical Facebook user may occasionally find the large amount of social information available to be taxing, and Facebook vacations could ameliorate this stress - at least in the short term, according to the authors.Many of theparticipants went into the break with askeptical view - I will probably feel upset as my social life will be totally stopped if I cannot useFacebook and cannot find my friends in Facebook, I will also feel like left behind as I will not be able to know what has happened with my Facebook friends in the coming five days. wrote one - and actually came out of the study feeling a lower level of life satisfaction than the normal users.Dr. Eric Vanman, a psychologist at the University of Queensland and the lead author of the study, on why this may have occurredAbstaining from Facebook was shown to reduce a persons level of the stress hormone cortisol, but peoples own ratin gs of their stress did not change - perhaps because they werent aware their stress had gone down. People experienced less well-being after those five days without Facebook - they felt less content with their lives - from the resulting social disconnection of being cut-off from their Facebook friends.Vanman added that the group feels these results would most-likely apply across the boardWe dont think that this is necessarily unique to Facebook, as peoples stress levels will probably reduce anytime they take a break from their favorite social media platforms.