Steve Austin was a U.S. astronaut who was gravely injured when his spacecraft crashed back to earth. He was rebuilt, almost from the ground up by government-approved experimental surgeries, giving him powerful prosthetics.
The “Six Million Dollar Man” first aired in 1973, starring Lee Majors, and it ran for five seasons. I remember that show, and I was amazed, as were millions of others, with what he could do with his prosthetic limbs and eyes.
Today’s prosthetics are getting closer and closer to that reality.
Companies have made enormous progress in both the aesthetics and functionality of prosthetics, which can be passive (more cosmetic than functional) or more involved. More real-looking artificial limbs can now be made using 3D printers. They’re a tremendous improvement from what was available only a few years back. There are also body-powered prosthetics, where the movements of the upper body, shoulder, and chest are captured and used to open or close an artificial hand.
My old roommate from medical school, Lt. Col. Don Reed Jr. (retired) saved many lives while serving in Iraq as a battlefield trauma surgeon, but many of those brave men and women would come home missing limbs. This is a problem war-faring humans have faced for millennia.
The first known true prosthesis used as a rehabilitative tool was that of the ancient Greeks. In 484 B.C., a soldier cut off his leg to escape imprisonment and replaced it with a wooden prosthesis. He traveled 30 miles on his wooden leg before being captured and quickly decapitated.
Today’s prosthetics are taking on a whole new meaning. The older prosthetics were simple tools to help a person cope with the horrible loss of a particular function. With a prosthetic leg, one was able to stand. Later, with advances, one could walk. The current generation lets an amputee run. Just think of the former South African runner, Oscar Pistorius, and the use of the “blade” prosthesis. Those blades were developed by medical engineer Van Phillips. The blades store kinetic energy like a spring.
These kinds of prosthetic arms are still experimental, extremely expensive, and not ready for common use.
Another improvement in prosthetics is more superficial, but also important. More real-looking artificial limbs can now be made using 3D printers. They’re a tremendous improvement from what was available only a few years ago.
There’s also osseointegration, which is a surgical technique that allows the amputee to attach the prosthesis directly to the bone of the missing limb. Osseointegration has been approved and used in Europe for several years and only recently here in the United States.
Myoelectric prosthetics use electrical stimulations from the residual limb to control movement of the new artificial limb by contracting that muscle, which sends the electric impulse to a controller that then triggers tiny battery-powered motors to move digits or the wrist, for example.
TMR, or targeted muscle reinnervation, is a very complicated surgical procedure for high amputees. This surgery rewires the nerves that were used in the hand or fingers to adjacent muscles with the goal of allowing the user to have some “thought control” over their prosthesis. The true functionality of this surgery is still limited, but promising.
Mobius Bionics has gone one step further and developed the LUKE Arm for shoulder-level amputees. This device allows the user to reach above his or her head (which was unheard of before with prosthetics) and even use a power drill. This arm uses a foot control placed on the shoe and intuitively reads the tilt of the shoe to interpret each movement and control the arm functions.
The future for artificial limbs is mind-boggling. I haven’t even touched on the ability of a quadriplegic (paralyzed from the neck down) to move a computer cursor with just thought or the “glasses” that will help a blind person “see.” Advanced technology, when used right, is amazing to witness, but we always have to be vigilant. The sad reality is that with every advance comes tremendous risk. The ability to better meld man and machine raises the possibility of far darker visions than the hopeful sights of the six million dollar man.
As Albert Einstein observed, “It has become appallingly obvious that our technology has exceeded our humanity.”