Prosthetic Arm
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Transcript of Prosthetic Arm
Factors Considered
Component Options: Hand Mechanism
Claw / Netting
Dexterity TaskObject Relocation TaskDistance Accuracy Task
Spring Clamp
Component Options: Mounting Apparatus
Long-Sleeve T-shirt PVC Pipe
Factors Considered
Comfort Cost Speed
Component Options: Mounting Apparatus
LeashLeather Figure-8 Harness
Factors Considered
Comfort Cost Complexity
Component Options: Cable
Latex Tubing Butcher’s Twine
Factors Considered
Comfort Cost
Trimmer Line
Strength
Team Members and Roles: George Jenkins - Captain - Senior - 2nd Year - Product Design, Report, Presentation Cody Rogers - Senior - 2nd Year - Product Design, Performance Challenges Shade Jenifer - Junior - 2nd Year - Product Design, Performance Challenges Christian Warren - Junior - 1st Year - Product Design, Report, Presentation
Maryland - Henry E. Lackey High School
Prosthetic Arm Team
The Prosthetic Arm Challenge detailed design criteria and testing specifications for a trans-radial prosthetic device. Devices are scored based on the distance accuracy relay, the object relocation task, the dexterity task, and design efficiency. This report details the efforts of the second Henry E. Lackey Prosthetic Arm Team to meet the goals of the challenge up to June 3rd, 2014. It includes a discussion of research, material choice, and other components of the design evolution, along with STEM influence and principles, and an analysis of preliminary tests. This design is a cost effective, efficient, and effective trans-radial prosthetic device. The tension created by straightening the user’s arm and the force created by the spring of the spring clamp is enough to hold and relocate relatively heavy objects. The device can be used to thread nuts onto bolts and throw ping pong balls, albeit with some difficulty. Additionally, the design is composed of highly cost-efficient materials. The design can be improved by focusing on the hand mechanism and the direct tension mechanism. If the direct tension method of design was maintained, possible re-design concepts would include using simple machines or a pulley system to enable an increase of the spring tension of the clamp but allow the force produced by straightening the arm to remain the same. Even without these advancements the current design remains an effective trans-radial prosthetic device and could be effective in a real life application.
Abstract
Constraints
$40 Budget Trans-RadialOperates Independently of Hand and Opposing Arm
Finger Number
Opening Distance
WeightMultiple Users
Bill of Materials
Design Process Challenge Prep Technical Report Back Board/ Presentation Prep
56 Hours 20 Hours 12 Hours 26 Hours
Time
Total Time: 114 Hours
Part Unit Dimensions Retail Price Price per Unit Quantity Used Total Cost Retail Source
PVC PipeCharlotte Pipe 6- in x 10 ft
Sch 40 PVC DWV Pipe$42.48 $0.354/inch 15.5 Inches $5.49 Lowes.com
Hardwood Oak, Red 3/4" x 4" x 48" $15.75 $0.08/inch^2 18 Inches^2 $1.44 Woodcraft.com
Leash Large, 6ft $6.49 $6.49/Leash 1 Leash $6.49 Chewy.com
Trimmer
Line
Husqvarna 639 00 51-05
230 ft Titanium Force
Premium
$15.99 $0.08/foot 3 Feet $0.24 vminnovations.com
Wood
Screws75 Pack, 1-3/4" $3.14 $0.042/screw 8 Screws $0.33 midlandhardware.com
Spring
Clamp
Jaw Opening Capacity
(Inch): 3 Overall Length
(Inch): 9
$8.36 $8.36/clamp 1 Clamp $5.85 use-enco.com
Sponge 9" x 5" $1.79 $1.79/sponge 1/2 Sponge $0.90 Amazon.com
Bolts100 Pack, Width: 3/8",
Length: 1-1/2"$165.50 $1.655/bolt 2 Bolts $3.31 Lowes.com
Nuts 25 Count, 3/8" $2.74 $0.1096/nut 2 Nuts $0.23 Lowes.com
Washers 50 Count, 3/8" $3.99 $0.0798/washer 2 Washers $0.16 Amazon.com
Butt
Conector50 Count, 12-10 Gauge $7.15
$0.143/Butt
connector
1 Butt
connector$0.14 protelecomsupply.com
Total $24.58
References• Norton, K. M. (n.d.). inMotion: A Brief History of Prosthetics. Amputee Coalition - Resources for amputees, amputation, limb loss,
caregivers and healthcare providers. Retrieved March 15, 2014, from http://www.amputee-coalition.org/inmotion/nov_dec_07/history_prost
• Burck, J., Zeher, M. J., Armiger, R., Beaty, J. D., & Laboratory, J. H. (n.d.). Developing the World’s Most Advanced Prosthetic Arm Using Model-Based Design - MathWorks News & Notes - 2009. MathWorks - MATLAB and Simulink for Technical Computing. Retrieved March 15, 2014, from http://www.mathworks.com/company/newsletters/news_notes/2009/jhu-model-based-design.html
• Scott, D. (n.d.). University of Illinois Students Design $300 Prosthetic Arm | Complex. Complex | Style, Music, Sneakers, Entertainment, Girls, Technology. Retrieved March 15, 2014, from http://www.complex.com/tech/2012/11/university-of-illinois-students-design-300-prosthetic-arm
• Chorost, M. (n.d.). A True Bionic Limb Remains Far Out of Reach | Wired Science | Wired.com. wired.com . Retrieved March 15, 2014, from http://www.wired.com/wiredscience/2012/03
• AMO Arm pneumatic prosthetic does mind-control on the cheap. (n.d.). Engadget. Retrieved March 15, 2014, from http://www.engadget.com/2011/04/05/amo-arm-pneumatic-prosthetic-does-mind-control-on-the-cheap/
• Nylon Dog Traffic Leash 1-inch x 2 foot Blue - Dog Leashes Nylon. (n.d.). Arcata Pet Supplies - Online pet shop for all your supply needs. Retrieved March 15, 2014, from http://www.arcatapet.com/item.cfm?cat=794
• Magellan self-actuated prosthetic device can be operated with your smartphone | The geek's guide to awesomeness | DamnGeeky. (n.d.). The geek's guide to awesomeness. Retrieved March 15, 2014, from http://www.damngeeky.com/2012/08/15/4071/magellan-self-actuated-prosthetic-device-can-be-operated-with-your-smartphone.html
• Alfred Mann Foundation » Limb Loss. (n.d.). Alfred Mann Foundation. Retrieved March 15, 2014, from http://aemf.org/our-research/current-focus/limb-loss/spring clamp. (n.d.). plastic spring clamp for hundreds of uses. Retrieved March 15, 2014, from http://www.alibaba.com/product-gs/341861413/plastic_spring_clamp_for_hundred
Distance Accuracy Relay Testing
0
10
20
30
40
50
60
70
80
2 meters 3.5 meters 5 meters
Successes
Distance
Arm Throws
Tennis Ball
Kick Ball
Ping Pong Ball
0
10
20
30
40
50
60
70
80
90
100
2 meters 3.5 meters 5 meters
Points
Distance
Arm Points
Tennis Ball
Kick Ball
Ping Pong Ball
0
10
20
30
40
50
60
70
80
90
100
2 meters 3.5 meters 5 meters
Successes
Distance
Control Throws
Tennis Ball
Kick Ball
Ping Pong Ball
0
20
40
60
80
100
120
140
2 meters 3.5 meters 5 meters
Points
Distance
Control Points
Tennis Ball
Kick Ball
Ping Pong Ball
Rapid Descent
Steady Decline
• Accuracy data indicates success with lighter objects.
• Accuracy degrades as distance grows.
• Data indicates speed and weight requirements of daily life are met.
• Device has moderate fine motor control.
Design Analysis
Strengths Weaknesses• Design Simplicity
• Cost Efficiency
• Strength of Clamp
• Mobility
• Ease of Use
• Ease of Maintenance
• Weight of Device
• Comfort
• User Operating Strength
Conclusions Device is a cost effective, efficient, and effective trans-radial
device. Device performs highly in each of the tested areas. Device could be used in a real world application.
RecommendationsWe would:
Conduct further tests for real life application. Further reduce the weight of the device. Add insulation into interior of device and edges. Increase mechanical advantage of the device.
• Pulley System• Position of the leash
Conclusions / Recommendations