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How advances in design and manufacturing are enabling
a new paradigm for digit amputation care.
Naked Prosthetics’ devices are body-driven mechanisms driven off of intact joints. In order to provide effective grasp forces, consideration must be paid to each joint’s capacity to generate torque. As with any anatomical joint, there are angular ranges throughout flexion/extension in which each joint experiences its maximum moment-generating capability. The factors influencing this peak force range include pretention on the tendons, muscle body engagement and, for the hand, the posture of the surrounding anatomy.
The combination of the hand joints with four-bar linkages provides a powerful opportunity for engineering optimization. A four-bar has an interesting property: its velocity profile changes throughout its trajectory. Sometimes its “throw” is very fast, and sometimes it is very slow. Given that speed and force are inversely related in force systems, it becomes imperative to consider peak joint moment generation ranges, four-bar kinematics, and functional hand grasps in order to create a powerful finger prosthesis.
Our devices mimic the kinematic coupling seen in the stable motion of anatomic fingers. Building on this and giving consideration to efficient load bearing postures, we provide tools that both mimic biology and behave quite differently, with the overall goal being to create a useful end effector capable of dexterity and strength. Our devices are often used for 12-16 hours per day on hard-labor jobs.
Naked Prosthetics’ goal is to change the harsh reality facing individuals after these all too common injuries and ensure that no one loses his or her vocation as a result. Our team works daily to innovate in a space where much innovation is needed and where technology has not yet lived up to its promise. We deliver solutions that can handle the load.
Downloadable information can be found on our Resources page.
“I put my prostheses to the test. Wearing them every day to work as a mechanic for grip, strength, and stability.”
—Nick, four MCPDrivers
“It is important to learn new skills after hand trauma,” he explains. “After a loss is the best time to explore something new because there is no benchmark of success to meet. You have to find your new normal in the little things.”
“You may feel hopeless in the moment, but it does get better. And you will be surprised at what you could learn. I am a different person now and I grew from the experience.”
"I am confident that I can do more things and then some with this new opportunity given to me—to inspire others who are just like me and to show them that for every setback, there is a major comeback!"
“It sounds cheesy and it really just takes time. You just have to see that it isn’t the end of the world. It could’ve been worse. Considering everything, it’s a small part of my life. I could’ve lost my hand, my arm. If you could see my truck, I don’t even know how I survived.”
"It’s a game changer for me. 20 years ago, as a freshly injured kid walking into a prosthetist’s office and being completely disheartened about what was available to help replace my fingers. Now, I finally have something that makes me feel like I have a bit of a whole hand again.”