Design Guidelines for Sensor Locations on 3D Printed Prosthetic Hands

2017 ◽  
Author(s):  
Hyun Hwang ◽  
Jun Han Bae ◽  
Byung-Cheol Min
Keyword(s):  
Design Guidelines ◽  
Prosthetic Hands ◽  
3D Printed ◽  
Sensor Locations

scholarly journals Engineering Design Process of Face Masks Based on Circularity and Life Cycle Assessment in the Constraint of the COVID-19 Pandemic

2021 ◽  
Vol 13 (9) ◽  
pp. 4948
Author(s):  
Núria Boix Rodríguez ◽  
Giovanni Formentini ◽  
Claudio Favi ◽  
Marco Marconi
Keyword(s):  
Life Cycle Assessment ◽  
Life Cycle ◽  
Environmental Sustainability ◽  
Design Guidelines ◽  
New Device ◽  
Engineering Design Process ◽  
Life Cycle Perspective ◽  
Different Types ◽  
3D Printed ◽  
Negative Impacts

Face masks are currently considered key equipment to protect people against the COVID-19 pandemic. The demand for such devices is considerable, as is the amount of plastic waste generated after their use (approximately 1.6 million tons/day since the outbreak). Even if the sanitary emergency must have the maximum priority, environmental concerns require investigation to find possible mitigation solutions. The aim of this work is to develop an eco-design actions guide that supports the design of dedicated masks, in a manner to reduce the negative impacts of these devices on the environment during the pandemic period. Toward this aim, an environmental assessment based on life cycle assessment and circularity assessment (material circularity indicator) of different types of masks have been carried out on (i) a 3D-printed mask with changeable filters, (ii) a surgical mask, (iii) an FFP2 mask with valve, (iv) an FFP2 mask without valve, and (v) a washable mask. Results highlight how reusable masks (i.e., 3D-printed masks and washable masks) are the most sustainable from a life cycle perspective, drastically reducing the environmental impacts in all categories. The outcomes of the analysis provide a framework to derive a set of eco-design guidelines which have been used to design a new device that couples protection requirements against the virus and environmental sustainability.

scholarly journals Data for benchmarking low-cost, 3D printed prosthetic hands

Data in Brief ◽  
2019 ◽  
Vol 25 ◽  
pp. 104163 ◽  
Author(s):  
Farah Alkhatib ◽  
John-John Cabibihan ◽  
Elsadig Mahdi
Keyword(s):  
Low Cost ◽  
Prosthetic Hands ◽  
3D Printed

scholarly journals Ten guidelines for the design of non-assembly mechanisms: The case of 3D-printed prosthetic hands

2018 ◽  
Vol 232 (9) ◽  
pp. 962-971 ◽  
Author(s):  
Juan Sebastian Cuellar ◽  
Gerwin Smit ◽  
Amir A Zadpoor ◽  
Paul Breedveld
Keyword(s):  
Developing Countries ◽  
3D Printing ◽  
Fused Deposition Modelling ◽  
Prosthetic Hand ◽  
Prosthetic Devices ◽  
Hand Prosthesis ◽  
Fused Deposition ◽  
Prosthetic Hands ◽  
Design Considerations ◽  
3D Printed

In developing countries, prosthetic workshops are limited, difficult to reach, or even non-existent. Especially, fabrication of active, multi-articulated, and personalized hand prosthetic devices is often seen as a time-consuming and demanding process. An active prosthetic hand made through the fused deposition modelling technology and fully assembled right after the end of the 3D printing process will increase accessibility of prosthetic devices by reducing or bypassing the current manufacturing and post-processing steps. In this study, an approach for producing active hand prosthesis that could be fabricated fully assembled by fused deposition modelling technology is developed. By presenting a successful case of non-assembly 3D printing, this article defines a list of design considerations that should be followed in order to achieve fully functional non-assembly devices. Ten design considerations for additive manufacturing of non-assembly mechanisms have been proposed and a design case has been successfully addressed resulting in a fully functional prosthetic hand. The hand prosthesis can be 3D printed with an inexpensive fused deposition modelling machine and is capable of performing different types of grasping. The activation force required to start a pinch grasp, the energy required for closing, and the overall mass are significantly lower than body-powered commercial prosthetic hands. The results suggest that this non-assembly design may be a good alternative for amputees in developing countries.

Development of an Affordable Myoelectric Hand for Transradial Amputees

2021 ◽  
pp. 352-364
Author(s):  
Alok Prakash ◽  
Shiru Sharma
Keyword(s):  
Upper Limb ◽  
Primary Method ◽  
Closing Time ◽  
Proportional Control ◽  
Prosthetic Devices ◽  
Heavy Weight ◽  
Prosthetic Hands ◽  
Control Scheme ◽  
3D Printed ◽  
Microcontroller Unit

Upper limb amputations seriously affect a patient's life by restricting their ability in performing various tasks. Prosthetic hands are considered the primary method to reinstate the lost capabilities of such amputees. However, the presently available prosthetic devices are unable to fulfill the requirements of users due to their excessively high cost, limited functionality, heavy weight, unnatural operation, and complexity. This article presents an affordable and simple control-based myoelectric hand for transradial amputees. The hand setup mainly consists of a self-designed surface electromyography (sEMG) sensor, a microcontroller unit and a five-fingered, intrinsically actuated 3D printed hand for dexterous operations. The developed hand was implemented with proportional control scheme and was successfully tested on five amputees (with missing lower forearms) for performing grasping activities of different objects. Further, the closing time and grip force at the fingertips were also determined for the hand to compare its performance with the commercially available hands.

Elastomeric passive transmission for autonomous force-velocity adaptation applied to 3D-printed prosthetics

2018 ◽  
Vol 3 (23) ◽  
pp. eaau5543 ◽  
Author(s):  
Kevin W. O’Brien ◽  
Patricia A. Xu ◽  
David J. Levine ◽  
Cameron A. Aubin ◽  
Ho-Jung Yang ◽  
...  
Keyword(s):  
Degrees Of Freedom ◽  
Cost Effective ◽  
Prosthetic Hand ◽  
Prosthetic Hands ◽  
Polyurethane Composite ◽  
Compact Size ◽  
Variable Transmission ◽  
3D Printed ◽  
Force Velocity ◽  
Projection Stereolithography

The force, speed, dexterity, and compact size required of prosthetic hands present extreme design challenges for engineers. Current prosthetics rely on high-quality motors to achieve adequate precision, force, and speed in a small enough form factor with the trade-off of high cost. We present a simple, compact, and cost-effective continuously variable transmission produced via projection stereolithography. Our transmission, which we call an elastomeric passive transmission (EPT), is a polyurethane composite cylinder that autonomously adjusts its radius based on the tension in a wire spooled around it. We integrated six of these EPTs into a three-dimensionally printed soft prosthetic hand with six active degrees of freedom. Our EPTs provided the prosthetic hand with about three times increase in grip force without compromising flexion speed. This increased performance leads to finger closing speeds of ~0.5 seconds (average radial velocity, ~180 degrees second−1) and maximum fingertip forces of ~32 newtons per finger.

Materials Testing of 3D Printed ABS and PLA Samples to Guide Mechanical Design

2016 ◽  
Author(s):  
Daniel Farbman ◽  
Chris McCoy
Keyword(s):  
Finite Element Analysis ◽  
Tensile Testing ◽  
Mechanical Design ◽  
Tensile Tests ◽  
Design Guidelines ◽  
Materials Testing ◽  
Element Analysis ◽  
Dog Bone ◽  
3D Printed ◽  
Future Work

A set of monotonic tensile tests was performed on 3-D printed plastics following ASTM standards. The experiment tested a total of 13 “dog bone” test specimens where the material, infill percentage, infill geometry, load orientation, and strain rate were varied. Strength-to-weight ratios of the various infill geometries were compared. It was found through tensile testing that the specific ultimate tensile strength (MPa/g) decreases as the infill percentage decreases and that hexagonal pattern infill geometry was stronger and stiffer than rectilinear infill. However, in finite element analysis, rectilinear infill showed less deformation than hexagonal infill when the same load was applied. Some design guidelines and future work are presented.

Self-trainable 3D-printed prosthetic hands

2021 ◽  
Author(s):  
Kyungho Nam ◽  
Christopher Crick
Keyword(s):  
Prosthetic Hands ◽  
3D Printed
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