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A prosthetic system foroperating machinerySpring 2015

So we call ourselves the farm arm, and today we are here to talk about a prosthetic adaptor system for farm machineryAnd we are here to learn today as much as you are, so please feel free to interrupt us at any pointOutline: 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 TechStarsBULLET POINTS KILL, PRACTICE PRACTICE PRACTICEPeople READ OR LISTEN, NOT BOTHDONT NEGELECT SHEAR STUPIDITY OF AUDIENCE -> DUMB DOWN1

1/10 farmers suffer an amputation (-National Safety Council)

Problem

While 4 months wasnt enough time to compete in a crowded marketspace, a trend we saw was that there were underserved needs for prostheses in agricultureStumbled upon NUPOC research - 1/10 farmers suffersome sort of amputation in their lifetime (you all know this 2003) National Safety CouncilFor 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 FAMILY2

Otto Bock Michelangelo Fillauer Workers Hook

ProblemCan cost up to $70,000Farmers prefer durability & body power

Hook & ringProblems tightly gripping controls

-NUPOC Field Survey

No quick release method from wheel.

Current Solution

As technology advances, complexity increases and so does costOccupational needs of farmers:Less fragilityBattery-life independentSelf-serviceabilityAffordability out of pocket

Range of MotionPostureLength & WeightTactilityForce transmissionTimelinessDurabilityAdaptabilitySafety (quick release)Functional RequirementsErgonomicsValidated Design Inputs

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

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The Farm Arm: Solution Overview

So here is our solution, the key technology is geometry to accommodate quick operation of controls Not connect or require voluntary grasping intuitiveTerminal device connects onto existing wrist unit and adaptor mounts onto machine controls7

Customer Feedback (Rumford, ME)

Id be very interested in using something like this. Id also use it for my truck!

So we brought it to a farm in ME to test it outThanks maine agrability Lani and ??VT agrability for chatting over the phoneTherese Vilkomm of AtinNH8

Market Statistics

# of U.S. Farmers?

Likelihood of injury farming? # of people living in US with an amputation today?

21 million2 million2.5x > than any other outdoor occupation

1. http://www.amputee-coalition.org/limb-loss-resource-center/resources-by-topic/limb-loss-statistics/limb-loss-statistics/#12. American farm bureau federation http://www.fb.org/index.php?fuseaction=newsroom.fastfacts3. Dangerous jobs (Fishing Most dangerous, construction workers, farmers, mining) http://www.bls.gov/cps/cpsaat18b.htm

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Product Options

DurableLight Weight Consumable

Explain liftime discrepancySRP $400 vs. $10010

More Markets for Adaptive Driving?Bureau of Labor Statistics (2007)

BTE amputees with workers compensation, medicare, or 2nd party insuranceCombat veterans returning to agriculture? Construction? truckingExcavators and other machineryEFFICIENCY OF TIME, ERROR, AND SAFETY IMPROVEMENTS

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1.2.3.4. ?

Potential Channels

Bob, pioneer of body power, had material ideas to reduce costJay explained how PCP prescribe solutions using a standard catalog best way to get it to people is though commercial MFG12

Differentiation

Current ProsthesesDesigned for prehensionElectromechanicalExpensive (Requires insurance)Designed for prehensionBody poweredAffordable OOP

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

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Team

Andrew Waite M.S. M.E. 15Design & 3D modeling

Jacob Cohen B.S.M.E. 15 Machinist, Material ScienceIndustry: MD&D

Danny Walsh, B.S.M.E. 15Medical Device R&D Engineer CoopCandidate for M.B.A. 2017

Jon LeydonB.S. M.E. 15Hardware/Design

Carly GajewskiB.S. M.E. 15Biosurgery

Org Structure? Background? Complementation?14

Outreach Efforts

VA?15

thefarmarm@gmail.comthefarmarm.org

Contact

Segway to video16

Vertical offsetTerminus angleDesign Features: Terminal Device

Hand overlaid w/ imageConnection w/ prosthetic socket: industry standard connections including -20 thread or quick-release partMention considered design features: compliant wrist and maybe anisotropic frictional surfaces17

Design Features: System

Force transmissionHard stopSelf-centeredAngular deviation toleranceRotational freedom18

Angle adjustabilityImpermanent connection (removabiliySimulates original control knob (usable by any operator)

Design Features: Adapter

Change to White AdapterBalance cost & durability

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GOAL: reduce tooling and production cost

Design for Manufacturability (DFM)

We wanted to make things a bit cheaper for manufacturing20

Material Considerations

Terminal Device(Prototype 1 Prototype 2)Wrist attachmentStainless SteelBody6061 Aluminum85 Shore-D PolyUrethaneTerminus6AL-4V TitaniumDelrinAdapterUHMW-PEDelrinComparison

Do it by partImportant material propertiesYield strengthWear resistanceFatigue strengthDensityCostManufacturability

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Adapter Mounting System

Here is the system we are designing for mounting onto controls22

Patient Financing

The Farm Arm is L-Code Eligible!

Anti-rotation barsPressure fitMating surface attachment pointRapid Prototyping EffortBypasses wrist jointPrevents forearm rotationLimits tactile feedback

Proof of concept with cheap items at home depot24

Field Test Results: Concept Works

Confirmed viabilityRefined designChose terminus angleEstablished adapter angular tolerance

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