Prosthetic Arm

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Factors Considered Component Options: Hand Mechanism Claw / Netting Dexterity Task Object Relocation Task Distance Accuracy Task Spring Clamp

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

Working Drawing

Related Physical Phenomena

Compression: 33 lbs Tension

FrictionMuscle

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

Testing: Data Tables

Object Relocation Testing Dexterity Challenge Testing

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