Buzz
Unlike the gecko and the octopus, humans are unfortunately unable to naturally regenerate lost limbs once they’ve been severed. This is where prostheses, or artificial limbs, come into play, with a rich history rooted in both engineering and medicine. From the devastation of warfare to the impact of disease, history has provided the circumstances for remarkable innovation.
Thanks to the creativity of inventors, amputees now have an array of options for rehabilitation after such life-altering injuries. Here are some of the most fascinating facts about the evolution of prosthetic technology, spanning from ancient civilizations to the possibilities of a far-off future.
10. The Egyptian Toe
A prosthesis is designed to restore the function of a missing limb. While most would likely imagine early prostheses as arms or legs, one of the earliest known prosthetic artifacts is surprisingly a toe. A wooden big toe, estimated to be around 3,000 years old, was discovered to have belonged to a noblewoman in ancient Egypt.
But why a toe? When it comes to functionality, toes play an important role in balance and stability as we walk, and the big toe bears 40 percent of the weight with each step. Additionally, a big toe would have been essential for properly wearing traditional ancient Egyptian sandals.
Yet, there’s another important reason for this prosthesis: aesthetics and the individual’s sense of wholeness. While we can’t know for certain, it’s quite possible that the noblewoman wore this prosthesis to feel more at ease with her body and to maintain a sense of normalcy among those around her, who had not lost a limb. This highlights the dual role of prostheses in supporting both physical and emotional rehabilitation.
9. General Marcus Sergius
Ancient Rome, a civilization famed for its warfare and battles, contributed significantly to the history of prostheses. General Marcus Sergius and his iron right hand have become legendary. After losing his right hand in battle during his second year in the military, Sergius’s story entered Roman folklore.
While it’s unclear if Sergius crafted the prosthesis himself, after enduring several battles with just one hand, he eventually acquired a prosthetic hand that was strapped to his arm. This prosthesis was specifically designed to hold his shield. The loss of his hand never slowed him down. He managed to escape capture by the enemy twice and liberated the cities of Carmona and Placentia. Sergius’s bravery and resilience demonstrate that disability only holds you back as much as you allow it.
8. The Rigveda
While the Egyptian toe is among the earliest prostheses discovered, the Rigveda holds the distinction of being the oldest known document to mention prostheses. Written between 3500 and 1800 BC in India, one section of the text recounts the tale of the warrior queen Vispali (also spelled 'Vispala'). A translation from Sanskrit reads: 'When, in the time of night, in Khela’s battle, a leg (caritra) was severed like a wild bird’s pinion, Straight ye gave Vispali a leg of iron that she might move when the conflict began.'
The Vedas [Hindu for 'Knowledge'] have long been recognized for containing references to early practices that resemble modern-day medical and surgical procedures. While the iron leg itself is not detailed, it’s reasonable to infer that the story of Vispali alludes to the use of prosthetic devices during that period in history.
Interestingly, there is some debate over whether Vispali was actually a human or, quite oddly, a horse. While the majority of scholars believe she was a human warrior, there remains a small group who prefer the interpretation that she was, in fact, a horse. To each their own.
7. Ambroise Pare
In the past, losing a limb was something that typically resulted from a terrible accident or, more commonly, from battle. Ambroise Pare, a French barber-surgeon, revolutionized the medical approach to amputation when he introduced it as a surgical procedure in 1529. Pare refined the techniques for safely amputating the limbs of soldiers who had been injured in combat.
Pare also made significant advancements in reducing the risk of bleeding during surgery by using wire or thread to constrict blood vessels. One of his notable techniques, called 'flap amputation,' involved saving extra skin and muscle to cover the stump after the amputation. Additionally, Pare designed prosthetic hands and prostheses for above-the-knee amputations.
Pare maintained a notebook filled with his prosthetic designs, including an amusing sketch of a prosthetic nose adorned with a distinguished fake mustache.
6. The US Civil War
It’s no surprise that the most significant advancements in prosthetic development occurred during times of war. During the US Civil War, it’s estimated that around 30,000 soldiers required amputations due to battle wounds (with some estimates placing the number closer to 50,000). This surge in demand for prosthetics led a Confederate soldier named James Hanger to invent the 'Hanger Limb.'
Hanger became the first Confederate soldier to lose a limb when a Union cannonball struck his left leg during the first battle of the Civil War. His leg had to be amputated above the knee, and he was initially fitted with a wooden leg, which he found to be inadequate. The 'Hanger Limb' featured hinged joints made from metal and barrel staves, making it the most advanced prosthesis of its time. Hanger eventually founded a company to mass-produce and distribute his invention.
5. Dubois D. Parmelee
Around the same time as James Hanger’s prostheses were first designed, there was another inventor making efforts to improve prosthetic technology. Dubois D. Parmelee, a chemist from New York City, was the holder of several patents having to do primarily with rubber. Parmelee’s contribution to prosthetic technology was focused on how the limb was attached to the body. Before Parmelee, prostheses had harnesses and straps that kept the limb in place. Unfortunately, the movement of the prosthesis could rub painfully against the amputee’s stump.
Parmelee invented a suction socket that used atmospheric pressure. Prostheses of this nature would have to be custom-made for each amputee to ensure that the shape and volume were perfect. The atmospheric pressure acted as a vacuum, which kept the prosthesis from aggravating the soft tissue of the amputee.
4. The Artificial Limb & Appliance Service
World War I caused widespread destruction and introduced even more advanced weaponry. With the intense fighting on the front lines, combined with mud and bacteria, infections became rampant. As new veterans returned, many with multiple amputations, the cost of custom-made prostheses soared.
During the war, the British government established a 'Limb Service' to assist the wounded. This marked the beginnings of the Artificial Limb & Appliance Service (ALAS) in Wales, which not only survived the war but continued to evolve and remains operational to this day. Britain wasn’t alone in offering support to veterans and amputees; similar services would become widespread in many developed countries throughout the 20th century.
3. Smart Prostheses
The idea of intelligent prosthetics is an exciting development in medical technology. While prosthetic limbs have come a long way, they still don't replicate the intimate connection that a real limb has with the brain. Traditional prosthetic hands, for example, may look the part and fit the wearer, but they often can't perform complex tasks like gripping or manipulating objects in the way the amputee needs.
This could change with the rise of smart prosthetics. Researchers are exploring ways to link prostheses to the brain via artificial intelligence. Imagine a scenario where the amputee simply thinks about picking up a cup, and the prosthetic hand responds to their thoughts. By making the brain recognize these prosthetics as part of the body, it will be able to send commands to the muscles to control the limb. The goal is for prostheses to react to muscle contractions, making them more intuitive and responsive.
In addition to better functionality, some innovators are working on prosthetics that monitor the health of the wearer. These smart prosthetics could track the user's movements and detect early signs of infection or damage to the limb, alerting the person before they even notice the issue. Although many of these technologies are still in development, it's clear that smart prosthetics could soon become a standard part of amputee care as technology continues to evolve.
2. 3D Printing
We've examined the progress in design, functionality, and the overall purpose of prosthetic limbs, all of which have significantly advanced in modern times. Now, it's time to turn our attention to the production process. As mentioned earlier, prosthetic limbs must be individually crafted for each amputee to ensure comfort and proper fit during use.
With the rise of 3-D printing, the production of prostheses has become faster and more efficient. For engineers and doctors, this technology has greatly reduced the time required to create these devices. Prostheses can now be customized easily, and as 3-D printing becomes more widespread, anyone can produce them on demand. Additionally, 3-D printing allows for the creation of lightweight covers that help give the prosthetic a more natural appearance. These covers also allow the wearer to personalize their prosthesis, giving them greater control over how it reflects their identity.
1. Ysidro M. Martinez
The Egyptian toe is an early example of prosthetic design that beautifully combined both form and function. However, prosthetic leg designers often focused too much on mimicking the exact shape of the missing limb. While these prostheses might look aesthetically pleasing, walking with them could feel awkward and cumbersome.
This all changed in the 1970s when Ysidro M. Martinez, an amputee and inventor, took a more innovative approach. His prostheses were lighter, with a higher center of mass and better weight distribution, which reduced friction, improved gait, and allowed the user to walk more smoothly, with better control over speed. Though his designs were originally only for below-the-knee amputees, they proved that prosthetics could be both functional and fashionable, even if they didn’t perfectly replicate the lost limb.
