Wiktor Wise
Prosthetic arms have evolved from being uncomfortable and clunky to becoming more sophisticated and versatile tools that can help individuals regain the ability to perform everyday tasks. A non-electrical prosthetic arm, also known as a passive arm prosthesis, does not function like a human arm but can be customised to look like one. It can be positioned in different ways and is often used for social functions. On the other hand, a body-powered arm prosthesis is a mechanical device that operates using a pulley system, with cables connecting the device to the user's muscles, allowing them to activate specific muscles to move the prosthetic. Advancements in prosthetic technology, such as myoelectric prostheses, offer more intuitive control, increased grip strength, and more natural hand movements.
| Characteristics | Values |
|---|---|
| Purpose | To replace a missing or deformed arm |
| Types | Passive arm prosthesis, body-powered arm prosthesis, myoelectric prosthesis |
| Functionality | Can help with everyday tasks such as eating and dressing |
| Control | Can be controlled by electrical signals from muscle sites, or by electrodes implanted in remaining muscles |
| Materials | Wood, aluminium, leather, silicone, carbon fiber, advanced polymers |
| Challenges | Heavy, may require significant effort to learn how to use, potential muscle strains and mechanical failures |
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What You'll Learn
- Myoelectric prostheses with intuitive control, increased grip strength, and natural hand movements
- Body-powered prostheses that operate using a pulley system
- Passive prostheses that don't function like a human arm but look like one
- TMR surgery that rewires nerves to provide users with thought control
- Non-electrical prostheses and mental health considerations, such as prosthetics controlled by thoughts
Myoelectric prostheses with intuitive control, increased grip strength, and natural hand movements
Myoelectric prostheses are an important innovation in the field of rehabilitation, offering upper-limb amputees the chance to recover gestures and prehensile abilities, thus easing their daily lives. Myoelectric prostheses are externally powered artificial limbs that can be controlled by the electrical signals generated by the user's muscles. This technology, therefore, offers a more intuitive and natural experience for the user, allowing them to perform a wider range of tasks.
The human hand is one of the most complex body parts, with a perfect interplay of nerves, tendons, muscles and bones, making it a remarkably versatile and precise instrument. Recreating its functions is a significant challenge for medical technology. Myoelectric prostheses aim to address this challenge by providing a more natural and intuitive experience for the user.
Myoelectric prostheses use sensors fabricated into the prosthetic socket to receive electrical signals from the user's residual limb muscles. These sensors relay information to a controller, which translates the data into commands for the electric motors to move the joints. The strength and speed of movements can be controlled by varying muscle intensity, allowing for a wide range of tasks to be accomplished.
To improve the user experience, researchers are focusing on developing intuitive control interfaces. This includes the use of surface high-density electromyography (HD-EMG) and convolutional neural networks (CNNs) to adapt the prosthesis to each user's unique muscle contraction patterns. This technology reduces training time and allows for easy installation and calibration. Additionally, hybrid prostheses combine myoelectric-controlled and body-powered components, providing greater comfort, range of motion, functionality and a more natural appearance.
Myoelectric prostheses with intuitive control, increased grip strength and natural hand movements offer a promising future for individuals with upper-limb differences. These advancements in prosthetic technology enable individuals to regain their ability to perform everyday tasks and improve their quality of life.
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Body-powered prostheses that operate using a pulley system
A body-powered prosthesis is a mechanical device that operates using a type of pulley system. This type of non-electrical prosthetic arm moves via cables that connect the device to muscles elsewhere on the user's body, such as the shoulder. The user activates these muscles to make the device move. Typically, body-powered prostheses have a tool or a claw at the end that can open and close.
Body-powered prostheses are a good option for repetitive tasks and hard manual labour. They are hardy and weatherproof and do not need a lot of calibrating to work. The cable and harness system provides sensory feedback when in use, so the user does not have to watch the prosthesis to know that it is working.
There are two types of body-powered systems: voluntary opening ("pull to open") and voluntary closing ("pull to close"). All "split hook" prostheses operate with a voluntary opening system, relying on elastic bands or springs for gripping force. More modern "prehensors", called GRIPS, utilize voluntary closing systems. Users of voluntary closing systems rely on their own body power and energy to create gripping force, which can generate prehension forces equivalent to or exceeding those of a normal hand (up to 100 pounds).
While body-powered prostheses are useful for certain tasks, they also come with potential risks and side effects, including muscle strains from overuse, mechanical failures, and electronic charging issues.
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Passive prostheses that don't function like a human arm but look like one
A passive arm prosthesis is a non-functional prosthetic arm that is designed to resemble a human arm. It is a popular option for social functions as it can be customised to look like a natural arm. Typically, passive arm prostheses are made from high-definition silicone that is custom-painted to closely resemble the wearer's existing skin tone, body hair, freckles, and other natural features. Tattoos and other unique artwork can also be included for personalisation.
Passive arm prostheses can be positioned in several ways. They usually have multi-positional joints, allowing the wearer to adjust the shoulder, elbow, wrist, or finger joints to improve their function. For example, the wearer can use their other hand or a nearby surface to position the joints of the prosthesis to make it easier to hold or carry something. This technology can restore the ability to grasp small objects like cups, pans, or even the hand of a loved one.
Passive prostheses are usually heavier than body-powered or high-tech prostheses and require effort to learn how to use. Some people may feel that the practical benefits of a passive prosthesis do not outweigh the costs. However, using a prosthesis has health benefits, such as helping the body balance its workload and distribute stress more evenly among the muscles. Not using a prosthesis can lead to overuse of the opposite side of the body, causing chronic neck and back pain, repetitive strain injuries, and reduced function or range of motion.
While passive prostheses are non-functional, there are other types of prosthetic arms that are functional. Body-powered arm prostheses, for example, are mechanical devices that operate using a pulley system. Cables connect the device to muscles elsewhere on the body, such as the shoulder, and the wearer activates these muscles to move the prosthesis. Body-powered prostheses are useful for repetitive tasks and hard manual labour. They are also weatherproof and do not require much calibration.
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TMR surgery that rewires nerves to provide users with thought control
Prosthetic arms have evolved from being uncomfortable and clunky to now being more sophisticated and versatile. They can be used to achieve a wide range of functions, including helping individuals who have gone through upper-limb amputation or have upper-limb differences to regain the ability to perform everyday tasks such as eating and dressing.
One of the challenges with prosthetics is achieving movement without the user consciously controlling it. While some prosthetic arms are passive and do not function like a human arm, they can be designed to look like one. These are typically used for social functions. On the other hand, body-powered prosthetic arms are mechanical devices that operate using a pulley system. Cables connect the device to muscles elsewhere in the body, and the user activates these muscles to make the device move.
To address the limitations of body-powered prosthetic arms, Targeted Muscle Reinnervation (TMR) surgery has been developed. TMR is a surgical procedure that reassigns nerves that once controlled hand or arm muscles on the residual limb or chest. During the procedure, a portion of an intact "targeted" muscle is denervated by cutting the nerve that usually controls the muscle. The nerve is then reinnervated by connecting one of the nerves severed in the amputation so that it will now control the targeted muscle. This helps prevent neuroma growth and normalizes nerve signals sent to the brain, thereby reducing pain signals.
TMR surgery can improve a patient's ability to control a myoelectric prosthesis. Electrodes can be placed over muscles on opposite sides of the residual limb, allowing the patient to open and close the hand. TMR can also provide multiple muscle sites to control prosthetic components such as an electric wrist rotator or an electric elbow with more intuitive thought. The procedure is most effective when performed preemptively before nerve pain begins, and it can also be used to address pain that has developed from a prior amputation.
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Non-electrical prostheses and mental health considerations, such as prosthetics controlled by thoughts
The loss of a limb can be emotionally challenging for most people and can lead to various psychological reactions. Mental health in prosthesis users is a significant issue, and if not addressed, it can significantly impact their lives. The right prosthesis can help users overcome these reactions and improve their overall mental health.
A prosthesis such as a high-functioning multi-articulating hand can help users regain their confidence and independence, allowing them to live happier and healthier lives. Losing a limb can cause a sudden lack of independence, leaving individuals feeling helpless and impacting their mental health.
Bionic hands, for example, use ENG signals from the user's residual muscles to control movement, allowing users to operate the hand with ease and even control each finger individually. This can be a significant improvement over passive prostheses, which are low-functioning and do not reduce the user's dependence on others.
Neuroprosthetic devices tap into the body's natural neural pathways, enabling a seamless two-way flow of information between the artificial limb and the wearer's mind. This technology can restore the sense of touch and support intuitive motor control, allowing wearers to flex an ankle or bend a finger with a simple thought.
The development of neuroprostheses has been influenced by advances in microelectronics, materials, and electrochemistry, as well as increased collaboration between scientists, engineers, and medical professionals. Researchers have devised various technical solutions, such as targeted muscle reinnervation (TMR) and composite flat interface nerve electrodes (C-FINEs), to achieve more natural and precise control of neuroprostheses.
While the focus is often on restoring physical capabilities, the design of a prosthesis can also impact a user's mental health. Some users may feel that a prosthesis that resembles a natural limb too closely can be a source of discomfort, affecting their body image and self-esteem. Embracing unique and elegant designs can empower users to proudly stand out and embrace their differences.
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Frequently asked questions
Non-electrical prosthetic arms can be body-powered and operate using a pulley system. Cables connect the device to muscles elsewhere in the body, such as the shoulder, and the user activates these muscles to move the device.
When you receive your prosthesis, a prosthetist will show you how to use it and take care of it. You will learn how to put it on and take it off, how to clean it, how to adjust it, and how to operate its mechanical and electronic parts. You will then work with a physical therapist and/or occupational therapist to learn how to use your prosthesis in your daily life.
Using a non-electrical prosthetic arm can help improve your quality of life by providing movement and independence. It can also help your body balance its workload better and distribute stress more evenly among your muscles.
