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The Farm Arm
- 1. A prosthetic system for operating machinery Spring 2015
- 2. 1/10 farmers suffer an amputation (-National Safety Council) Problem
- 3. Otto Bock “Michelangelo” Fillauer “Workers Hook” Problem Can cost up to $70,000 Farmers prefer durability & body power
- 4. “Hook & ring” “Problems tightly gripping controls” -NUPOC Field Survey No quick release method from wheel. Current Solution
- 5. As technology advances, complexity increases and so does cost Occupational needs of farmers: • Less fragility • Battery-life independent • Self-serviceability • Affordability out of pocket
- 6. Range of Motion Posture Length & Weight Tactility Force transmission Timeliness Durability Adaptability Safety (quick release) Functional Requirements Ergonomics Validated Design Inputs
- 7. The Farm Arm: Solution Overview
- 8. Customer Feedback (Rumford, ME) “I’d be very interested in using something like this. I’d also use it for my truck!”
- 9. Market Statistics # of U.S. Farmers? Likelihood of injury farming? # of people living in US with an amputation today? 21 million 2 million 2.5x > than any other outdoor occupation
- 10. Product Options Durable Light Weight Consumable
- 11. 22% 11% 21% 23% 6% 17% Amputation Frequency by Industry Agriculture Construction Manufacturing Transportation & Utilities Mining Other More Markets for Adaptive Driving? Bureau of Labor Statistics (2007)
- 13. Differentiation Current Prostheses Designed for prehension Electromechanical Expensive (Requires insurance) Designed for prehension Body powered Affordable OOP
- 14. Team Andrew Waite M.S. M.E. ’15 Design & 3D modeling Jacob Cohen B.S.M.E. ‘15 Machinist, Material Science Industry: MD&D Danny Walsh, B.S.M.E. ‘15 Medical Device R&D Engineer Coop Candidate for M.B.A. 2017 Jon Leydon B.S. M.E. ’15 Hardware/Design Carly Gajewski B.S. M.E. ’15 Biosurgery
- 15. Outreach Efforts
- 17. • Vertical offset • Terminus angle Design Features: Terminal Device
- 19. • Angle adjustability • Impermanent connection (removabiliy • Simulates original control knob (usable by any operator) Design Features: Adapter
- 20. • GOAL: reduce tooling and production cost Design for Manufacturability (DFM)
- 21. Material Considerations Terminal Device (Prototype 1 Prototype 2) Wrist attachment Stainless Steel Body 6061 Aluminum 85 Shore-D PolyUrethane Terminus 6AL-4V Titanium Delrin Adapter UHMW-PE Delrin Comparison
- 23. Patient Financing The Farm Arm is L-Code Eligible!
- 24. Anti-rotation bars Pressure fit Mating surface attachment point Rapid Prototyping Effort Bypasses wrist joint Prevents forearm rotation Limits tactile feedback
- 25. Field Test Results: Concept Works
Editor's Notes
- So we call ourselves the farm arm, and today we are here to talk about a prosthetic adaptor system for farm machinery And we are here to learn today as much as you are, so please feel free to interrupt us at any point Outline: 20 minutes present, 5 minute video, then we want to hear feedback from you with questions and answers This presentation assumes our audience will be independent living activists, a lot of disabled farmers, and agrability specialists: Tips form TechStars BULLET POINTS KILL, PRACTICE PRACTICE PRACTICE People READ OR LISTEN, NOT BOTH DON’T NEGELECT SHEAR STUPIDITY OF AUDIENCE -> DUMB DOWN
- While 4 months wasn’t enough time to compete in a crowded marketspace, a trend we saw was that there were underserved needs for prostheses in agriculture Stumbled upon NUPOC research - 1/10 farmers suffersome sort of amputation in their lifetime (you all know this 2003) – National Safety Council For those that were able to peruse the AgrAbility Harvest, the aggregation of findings is right in alignment with our own research (thank Paul Jones) Farmers use agricultural machinery and at the same time, farming is very dangerous, so what options does a farmer have? SHOW HAPPY FARMER AND FAMILY
- Functionally, we needed our design to 1) transmit force effectively 2) enable a quick transition 3) prove durable to wear 4) accomodate various ctrl interfaces 5) and be safe Biomechanics also played a critical role. For the lost rotation about the forearm and articulation about the wrist. We needed to ensure a relevant ROM is still possible for the task without requiring any unnatural body positioning (a subject my compensate with lateral flexion of the trunk that contorts the spine placing a risk of nerve damage). We needed geometry to allow for ROM at the interface, emulate the biomechanical length & weight of the opposite limb, Make sure there is a system for knowing when engaged with the control
- So here is our solution, the key technology is geometry to accommodate quick operation of controls Not connect or require voluntary grasping – intuitive Terminal device connects onto existing wrist unit and adaptor mounts onto machine controls
- So we brought it to a farm in ME to test it out Thanks maine agrability Lani and ?? VT agrability for chatting over the phone Therese Vilkomm of AtinNH
- 1. http://www.amputee-coalition.org/limb-loss-resource-center/resources-by-topic/limb-loss-statistics/limb-loss-statistics/#1 2. American farm bureau federation http://www.fb.org/index.php?fuseaction=newsroom.fastfacts 3. Dangerous jobs (Fishing Most dangerous, construction workers, farmers, mining) http://www.bls.gov/cps/cpsaat18b.htm
- Explain liftime discrepancy SRP $400 vs. $100
- BTE amputees with workers compensation, medicare, or 2nd party insurance Combat veterans returning to agriculture? Construction? trucking Excavators and other machinery EFFICIENCY OF TIME, ERROR, AND SAFETY IMPROVEMENTS
- Bob, pioneer of body power, had material ideas to reduce cost Jay explained how PCP prescribe solutions using a standard catalog – best way to get it to people is though commercial MFG
- No myoelectrics and no pre-hension necessary Because of this, design is very simple and thus much more affordable to those without insurance ($500) Task-specific nature
- Org Structure? Background? Complementation?
- VA?
- Segway to video
- Hand overlaid w/ image Connection w/ prosthetic socket: industry standard connections including ½”-20 thread or quick-release part Mention considered design features: compliant wrist and maybe anisotropic frictional surfaces
- Force transmission Hard stop Self-centered Angular deviation tolerance Rotational freedom
- Change to White Adapter Balance cost & durability
- We wanted to make things a bit cheaper for manufacturing
- Do it by part Important material properties Yield strength Wear resistance Fatigue strength Density Cost Manufacturability
- Here is the system we are designing for mounting onto controls
- Proof of concept with cheap items at home depot
- Confirmed viability Refined design Chose terminus angle Established adapter angular tolerance