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High School Student Creates 3D Printed Biomimetic Prosthetic

March 10, 2017

Among all of the applications of 3D printing, medical applications are one of the most interesting. 3D printing has kick-started a golden age of affordable medical supplies and utilities. Within the medical field, prosthetics have been gaining particular prominence. This is due to how 3D printing enabled designers to create shapes once thought too intricate to mass produce. As a result, functional designs of various prosthetic parts has gone up.

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That’s where Grayson Galisky comes in. Grayson is a high school student that has built a functional biomimetic arm. In addition, he designed 37 of the 57 3D files necessary for this project. He obtained the rest from thingiverse and modified them.

Structural Specifications

According to Grayson the arm “is comprised of 3D printed bones, ligaments, tendon sheaths, and supporting structures like the palm and servo tower mounting pieces. In addition, I take advantage of both rigid and flexible materials in my design.” Grayson said he takes “advantage of both rigid and flexible materials in my design.”

Grayson has insisted that the design stays affordable. “Since most of the design can be printed on a hobbyist 3D printer, the overall cost of the project including motors and other parts can be kept under $600”. Additionally, he informed us that he made the arm from multiple individual parts. These included:

  • 20 bones.
  • 14 tendon sheaths.
  • 16 ligaments.
  • 20 tendon guides.
  • 1 palm.
  • 2 servo mounting plates.
  • 6 pulleys.
  • and 1 carpal tunnel.

Grayson also added that his design allowed for improved dexterity making it a marked improvement on most prosthetics. The hand takes its primary inspiration from the insides of a human hand as opposed to mechanical joints. As a result, it displays a more realistic range of motion and speed. Consequently, Grayson used available biological data about how the human hand works to further improve the model.

“I followed the blueprint of the human hand, using printed ligaments and laser cut rubber to form a joint capsule.” This allowed for improved performance and better dexterity over traditional robot hands.

Medical Implementation, Prosthetics and 3D Printing

Medical applications of additive manufacturing will eventually be widely available. Grayson also stressed that 3D printing was core to his design. “The level of detail and customization of this hand would make it much more expensive to manufacture if I did not have a 3D printer. Also, all of the parts can be printed in about 3-4 days.”

Similarly, just last week Ben Ryan printed a prosthetic arm for his son. Ben’s design differed greatly from Grayson’s (it was also a much simpler design). Ben used an Xbox Kinect as a scanner and modeled the design in the style of more traditional robotics. However, they both were private citizens creating parts at home. This kind of innovation would have been impossible without sufficient help and funding. In an age when people can 3D print whatever they desire, industrious people can often make great contributions to fields once dominated solely by massive companies.

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