Biohand: An Inexpensive 3D Printed Open Source Prosthetic

Share this Article

fingMartin Vincent Bloedorn is a Brazilian CAD enthusiast who says he enjoys learning languages from C++ to Japanese, “fiddling on my 3D printer,” and playing the drums.

Martin Vincent Bloedorn

Martin Vincent Bloedorn

This project from Bloedorn qualifies as considerably more than “fiddling.” It’s a 3D printed prosthetic hand which in many ways functions just like a human hand, but it uses actuated motors with a linkage that drives each finger via a threaded rod.

The motor and drive screw alone are capable of lifting a couple of pounds, and Bloedorn’s design uses the servo motor’s potentiometer to create a feedback loop that uses the position of each finger to drive electronics.

Bloedorn says, despite the high level of sophistication of his device, the real key was to make certain the Biohand would be relatively inexpensive.

“I live in Brazil,” Bloedorn says. “Here – unfortunately – lots of components are expensive or hard to get. This constrained a lot of design choices. I tried my best to use solely open-source development tools (or, in worst cases, free-of-charge ones).”

5160931435035011896The fingers in the hand are actuated individually and make use of a 4-bar linkage which synchronizes the movement of the proximal and distal phalanges. Fully enclosed in the palm, the location of the actuator virtually guarantees that wrist disarticulation or transradial amputation victims can safely use the hand.

The selection of standard RC servo motors was made as Bloedorn says they can be picked up nearly anywhere in the world and a number of their internal parts are very similar across the full range of manufacturers. He says he used the DC motor and a pair of gears from a common metal RC servo to design his 3D printable linear actuator. It uses a standard, 25mm M3 piece as a “leadscrew” to drive the hand.

Bloedorn created all the mechanical designs for the Biohand in Autodesk Inventor. Though that’s not open-source software, he was okay with that choice as a 3-year Pro license is available for students.

2680861435035058934 The system is powered by a 2S LiPo battery, and the micro servo for the thumb will ultimately use an LM317 or a LM1117 regulator.

Bloedorn adds that though his current prototype lacks aesthetically pleasing covers, they’re on the way in a later iteration of the design.

You can check out the complete design documentation for the Biohand on Hackaday here, and Bloedorn adds that he plans to continue development of the project.

What do you think about this 3D printed, open-source, servo-driven prosthetic hand from Brazilian designer Martin Vincent Bloedorn? Let us know in the Open Source 3D Printed Biohand forum thread on 3DPB.com.

8525701435175978621702821435035019108

 

Share this Article


Recent News

Zortrax 3D Printers Save on Prototyping Costs & Time for Smart Glass Solutions

Revo Foods Closes €1.5M Funding Round for 3D Printed Plant-Based Seafood



Categories

3D Design

3D Printed Art

3D Printed Guns

3D Printer Reviews


You May Also Like

MX3D Receives €2.25M to Commercialize Metal 3D Printing Welding Robots

Perhaps most known for 3D printing a massive steel bridge in the Netherlands, Dutch startup MX3D has recently received a €2.25 million investment. Funding came from DOEN Participaties, PDENH, and...

Featured

Fortify Closes $20M VC Round for Magnetically-Aligned Composite 3D Printing

Cota Capital, Accel Partners, Neotribe Ventures, and Prelude Ventures have participated in a $20 million equity round for Fortify. Boston-based Fortify has developed a digital light processing (DLP) technology that...

Featured

ValCUN Closes €1.5 Million Financing Round for Unique Plasma Metal 3D Printing

Belgian startup ValCUN has just raised €1.5 million to further the development of its metal printing technology. PMV, VLAIO, and private investors took part in the funding round in the...

Redefine Meat Raises $29M to Grow its 3D Printed Alt-Meat Portfolio

Animal-free meat startup Redefine Meat said it raised $29 million in an equity-based financing round that will be used to expand its plant-based meat portfolio and support its commercial launch...


Shop

View our broad assortment of in house and third party products.