Suitability of the Openly Accessible 3D Printed Prosthetic Hands for War-Wounded ChildrenThe field of rehabilitation and assistive devices is being disrupted by innovations in desktop 3D printers and open-source designs. For upper limb prosthetics, those technologies have demonstrated a strong potential to aid those with missing hands. However, there are basic interfacing issues that need to be addressed for long term usage. The functionality, durability, and the price need to be considered especially for those in difficult living conditions. We evaluated the most popular designs of body-powered, 3D printed prosthetic hands. We selected a representative sample and evaluated its suitability for its grasping postures, durability, and cost. The prosthetic hand can perform three grasping postures out of the 33 grasps that a human hand can do. This corresponds to grasping objects similar to a coin, a golf ball, and a credit card. Results showed that the material used in the hand and the cables can withstand a 22 N normal grasping force, which is acceptable based on standards for accessibility design. The cost model showed that a 3D printed hand could be produced for as low as $19. For the benefit of children with congenital missing limbs and for the war-wounded, the results can serve as a baseline study to advance the development of prosthetic hands that are functional yet low-cost.
Raptor Reloaded by e-NABLE by e-NABLEPLEASE NOTE: While the Raptor Reloaded has been a very popular design for the e-NABLE community, it is no longer recommended for use, other than for testing/research purposes. Testing has shown that the gripping capabilities of this design are not as good as more recent e-NABLE designs.
Information about currently recommended e-NABLE hand designs can be found here: https://hub.e-nable.org/p/devices
The Raptor Reloaded is an updated release of the original that incorporates feedback from the e-NABLE community and has CAD design source files available in STEP, IGES, IPT, and F3D formats.
Updates in the 12-17-14 release include:
-- Improved print-ability due to custom modeled supports
-- Cyborg Beast compatible sizing
-- Improved dovetail geometry
-- New tensioner retention clip
-- Easier to use tensioner pins
-- Low profile elastics with two tie-off options
-- More access to elastic and flexsor routing channels
-- Debossed versioning information on palm and gauntlet
-- Slimmer, more anthropomorhpic fingers
-- Narrower knuckle block
-- More intuitive assembly (new one-way proximals)
-- Thorough documentation and modular design
-- Source files in native Fusion 360 format, also STEP and IGES
-- Additional velcro-mounting options as well as traditional velcro loop and leather options
-- Re-oriented snap-pin head recesses to improve printability
-- Knuckle pins are now removable, making the hand easy to repair and upgrade
-- Strengthened tie-bars on finger tips
Native CAD source files available here:Full AssemblyLeft PalmRight PalmGauntletProximal PhalangeFingertipFinger Snap Pin
Detailed assembly instructions available here.
Changelog:
-- 1/4/15 -- updated finger snap pins (raptor_2.0_finger_pin.stl) to fix fit problems. Updated full hand plates with new pin as well. AB
-- 2/1/15 -- updated cover image to reflect recommended elastic stringing, added fingertip with finger nail that can be painted, added link to detailed print and assembly instructions on Instructables. AB
Figure 4: Full degrees-of-freedom of a hand. It involves the use of 26...Download scientific diagram | Full degrees-of-freedom of a hand. It involves the use of 26 DOFs, being 3 for the translations of the hand in the x, y , and z directions, 3 for the wrist rotations, and 4 for the joint rotations of each of the five fingers, including the thumb. from publication: 3D Hand Tracker for Visual Sign Recognition | The gesture recognition process, in general, may be divided into two stages: motion sensing, which extracts useful data from hand motion; and the classification process, which classifies the motion sensing data as gestures. We have developed the visionbased Hand Motion... | Hand, 3D and Motion | ResearchGate, the professional network for scientists.
Characteristics of a 3D-printed prosthetic hand for use in developing countriesArising out of civil conflict, disease, birth defects, and traumatic accidents, many people in developing countries lack hands or fingers. Prosthetic hands can help give these people a sense of agency and increased ability to perform everyday tasks. Unfortunately, many prostheses are prohibitively expensive and often require frequent maintenance and repair. Therefore, they are financially and geographically inaccessible to most people living in developing countries. A 3D printed, open-source hand is one possible solution owing to its low cost and potential for customization. However, the hand must be appropriate for the environmental conditions and lifestyles found in developing countries. To characterize the functionality of the 3D printed hand, a series of daily task and object tests were carried out. While the prosthesis was able to successfully complete a number of tasks, it had difficulty with those that required intricate movements and with heavy objects.
