Prosthetic Arm Force Reducer Team 1 – Halliday's ... - Ohio University

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Table of Contents Page Page 1.0 Introduction………………………………………………………………………………....3 1.1 Initial Needs Statement…………………………………………………………..…3 2.0 Customer Needs Assessment………………………………………………………….…....3 2.1 Weighting of Customer Needs……………………………………….......................5 3.0 Revised Need Statement and Target Specifications…………………………………..……5 4.0 External Search……………………………………………………………….…………….7 4.1 Benchmarking……………………………………………………………………....8 4.2 Application Patents………………………………………………………………..14 4.3 Application Standards……………………………………………………………..15 4.4 Application Constraints…………………………………………………………...16 5.0 Concept Generation……………………………………………………………………….17 5.1 Concept Generation……………………………………………………………….17 5.2 Concept Development, Scoring and Selection……………………………….……21 6.0 Concept Selection…………………………………………………………………………23 6.1 Data and Calculations for Feasibility and Effectiveness Analysis………………..23 6.2 Concept Development, Scoring and Selection…………………………………….28 7.0 Final Design…………………………………………………………………………….....29 7.1 System Personalization and Operation…………………………………………....40 7.2 How is it Manufactured...........................................................................................40 7.3 Cost Analysis & Bill of Materials…………………………………………………45 7.4 Design Validation…………………………………………………………………47 8.0 Conclusion………………………………………………………………………...………48 Appendix A – Split Hook Sample Calculation…………………………………………………..51 Appendix B – Interview Summaries……………………………………………………………..52 Appendix C – Tim Lang’s Forearm Dimensions & Data………………………………………..55 References………………………………………………………………………………………..56 2
1.0 Introduction Limb loss generally refers to the absence of any part of an extremity due to surgical or traumatic amputation (Amputee Coalition of America 2008). Upper limb loss accounts for about 30% of the 350,000 persons with amputations in the United States (Kulley 2008). There are also multiple causes for upper limb loss such as disease, traumatic accidents, infections, and tumors. The field of agriculture is a very dangerous work environment with heavy equipment and many chances for accidents. Farming accidents are a common cause of upper limb loss that can put many farmers out of work. We would like to work with a farmer to develop an upgrade to the current prosthetic systems in use which would be able to assist that farmer in their daily work. Important objectives of the design project involve: • Full customer research to determine all the positives and negatives of the current system • Full benchmarking research to determine what has been attempted already and what has or has not worked • Solving the customers main needs with as little manufacturing and complexity as possible Through research, feedback, and further design our goal is to meet our objectives and design an assistive device for people with upper arm loss, specifically in the field of agriculture. A high standard of excellence will be put forth on all our efforts reflecting our strong team work, willingness, enthusiasm, and genuine interest to improve workplace conditions for people with disabilities. 1.1 Initial Needs Statement There is a need for assistive technology devices that reduce barriers that prevent persons with severe disabilities from entering or advancing in the workplace. Devices are needed to address environmental accommodation, functional assistance, and mobility issues for people with cognitive disabilities, developmental disabilities, and physical impairments (vision, hearing and mobility) (NISH National Scholar Award for Workplace Innovation & Design 2007/2008). 2.0 Customer Needs Assessment A customer has been identified who has upper limb loss above the elbow of his right arm. Our customer, Tim Lang, operates a dairy farm in Marietta, Ohio and lost his right arm approximately two years ago. Now that Tim has a prosthetic arm he is able to continue operating his farm, but with physical discomfort and difficulties. Through interviews (See Appendix A) and meetings with him as well as rehabilitation engineers, vocational supervisors, and prosthetic suppliers we have compiled a list of design features that would aid him in his daily farming tasks (See Table 2.0.1). Our customer has identified physical discomfort as his biggest problem with his prosthetic followed by a desire to have increased grip strength and lastly to make the device easy enough to fix that he himself could make repairs to it without having to send it in to a specialized prosthetics manufacturer. In order to weight our needs, the Analytical Hierarchy Process was 3
Page 1: Prosthetic Arm Force Reducer Team 1
Page 5 and 6: 2.1 Weighting of Customer Needs Wei
Page 7 and 8: which could limit the use of rubber
Page 9 and 10: design of the two load hook allows
Page 11 and 12: Fig. 4.1.6 - Utah Arm 3 MAGNUM Para
Page 13 and 14: Feature Hosmer Model 7 Work Hook Ot
Page 15 and 16: hook is closed. The harness idea is
Page 17 and 18: purchase it. Safety is another exte
Page 19 and 20: Figure 5.1.2 - Solid Edge Model of
Page 21 and 22: 5.1.4 Concept D - Upgraded Springs
Page 23 and 24: 6.0 Concept Selection 6.1 Data and
Page 25 and 26: Figure 6.1.4 - Input Force FBD The
Page 27 and 28: Since the torques of the both the r
Page 29 and 30: Once the design of the system was u
Page 31 and 32: 7.0.3 Professional/Ethical Standard
Page 33 and 34: Table 7.0.2 - Risk Priority Number
Page 35 and 36: The actual FEA testing involved uti
Page 37 and 38: Another sector that has aided in ou
Page 39 and 40: Figure 7.0.10 Cable Path for Mechan
Page 41 and 42: 7.2.1 Rings (Part #’s THH-001 [El
Page 43 and 44: 7.2.4 Collars 1) Using lathe turn o
Page 45 and 46: 7.3 Cost Analysis & Bill of Materia
Page 47 and 48: manufacturing costs are $525.00. Th
Page 49 and 50: operation necessary. This convertib
Page 51 and 52: Appendix A - Split Hook Sample Calc
Page 53 and 54:
George Platounaris - Interview (12:
Page 55 and 56:
Appendix C - Tim Lang’s Forearm D
Page 57 and 58:
Health Progress, “Disables Enteri
Page 59:
Drawing Package 1. THH‐001……
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Prosthetic Arm Force Reducer Team 1 – Halliday's ... - Ohio University

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