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Status Report 3 Status Report 3 Senior Design,Senior Design, BME 273BME 273Professor: Dr. Paul KingProfessor: Dr. Paul KingMarch 27, 2000March 27, 2000
Members: Wan-Yin Chan, Megan Lan, T.J. Members: Wan-Yin Chan, Megan Lan, T.J. PaynePayne
Advisor: Dr. R. Steven Couch, M.D.Advisor: Dr. R. Steven Couch, M.D.(Assistant Medical Director for Pediatrics at Vanderbilt (Assistant Medical Director for Pediatrics at Vanderbilt
Stallworth Rehabilitation Hospital) Stallworth Rehabilitation Hospital)
Project Description: Hand-Operated Riding Project Description: Hand-Operated Riding LawnmowerLawnmower
ProblemProblem: Subject with spinal cord injury is : Subject with spinal cord injury is unable to safely operate Riding unable to safely operate Riding Lawnmower due to lack of lower body Lawnmower due to lack of lower body control control
ObjectivesObjectives: Modify a riding lawnmower to : Modify a riding lawnmower to address the physical limitations of a address the physical limitations of a paraplegic and to further enhance safetyparaplegic and to further enhance safety
Paraplegic Patient Paraplegic Patient InformationInformation
Name: Mark SingerName: Mark Singer Age: 27Age: 27 Weight: 165 lbsWeight: 165 lbs Height: 5’8”Height: 5’8” Shoe Size: 10.5Shoe Size: 10.5 Education Level: Associates Degree in Education Level: Associates Degree in
Mechanical EngineeringMechanical Engineering Level T8 Spinal InjuryLevel T8 Spinal Injury Wheelchair Model: Action Terminator with 25 in. Wheelchair Model: Action Terminator with 25 in.
wheelswheels
Project ModulesProject Modules
Safety Analysis and Brainstorming: Safety Analysis and Brainstorming: ALLALL
Brake Conversion: T.J. PayneBrake Conversion: T.J. Payne Mount/Dismount System: Megan LanMount/Dismount System: Megan Lan Foot/Body Restraints: Wan-Yin ChanFoot/Body Restraints: Wan-Yin Chan Additional ModificationsAdditional Modifications
Brake Conversion SystemBrake Conversion System
ConsiderationsConsiderations– Standard foot-powered push pedal attached to pull cable Standard foot-powered push pedal attached to pull cable
activates brake activates brake andand clutch for shifting gears clutch for shifting gears
– A 2.5-inch pull of the cable is required to stop the mowerA 2.5-inch pull of the cable is required to stop the mower
Possible IdeasPossible Ideas– Bicycle-style handbrake attached to pre-existing cableBicycle-style handbrake attached to pre-existing cable– Push-lever system similar to that employed in subject’s Push-lever system similar to that employed in subject’s
carcar– Single fulcrum pull-lever systemSingle fulcrum pull-lever system
Brake ModificationsBrake Modifications Chose pull leverChose pull lever
– Longer pull than handbrakeLonger pull than handbrake– Mechanical advantageMechanical advantage
1/3:2/3 total length ratio or 12”:24” cable-fulcrum: fulcrum-handle distance1/3:2/3 total length ratio or 12”:24” cable-fulcrum: fulcrum-handle distance
– Fewer moving parts than push leverFewer moving parts than push lever less mechanical failureless mechanical failure
ComponentsComponents– One 36” steel pipeOne 36” steel pipe– One 1/4” x 2” hex bolt with two 3/16” hex nuts and lock washersOne 1/4” x 2” hex bolt with two 3/16” hex nuts and lock washers
Brake ModificationsBrake Modifications
Mount/Dismount SystemMount/Dismount System
Previous Ideas - Swing-away handle Previous Ideas - Swing-away handle bar, Overhead barbar, Overhead bar
Final Idea - Ramp Final Idea - Ramp Ramp Dimensions:Ramp Dimensions:
– Height: 7 inches -->Height: 7 inches -->– Slope length: 7 feetSlope length: 7 feet– Slope width: 48 inchesSlope width: 48 inches– Platform: 60 x 60 inches Platform: 60 x 60 inches
(wheelchair length = 28 inches)(wheelchair length = 28 inches)
Completed RampCompleted Ramp
Foot Restraint SystemFoot Restraint System
Foot statisticsFoot statistics– Shoe length: 13 inchesShoe length: 13 inches– Shoe width: 4.5 inches (widest)Shoe width: 4.5 inches (widest)
Velcro Restraint SystemVelcro Restraint System– 1 inch wide velcro1 inch wide velcro– 5.5 inch foot gap5.5 inch foot gap
Purpose: Stabilization of Legs and Purpose: Stabilization of Legs and FeetFeet
Schematic of Foot Restraint Schematic of Foot Restraint SystemSystem
Body Restraint SystemBody Restraint System
Seat Belt Seat Belt – Visual AidsVisual Aids– PlacementPlacement– PurposePurpose
Current StatusCurrent Status
Mount/Dismount, Foot Restraint, and Mount/Dismount, Foot Restraint, and Brake Conversion Systems have been Brake Conversion Systems have been completedcompleted
Designsafe Analysis has been Designsafe Analysis has been completedcompleted
Project Costs - approximately $115Project Costs - approximately $115– Tax-free ramp materials, free deliveryTax-free ramp materials, free delivery– Used seat beltUsed seat belt– Free velcroFree velcro
Needs/Future WorkNeeds/Future Work
Finish Body Restraint SystemFinish Body Restraint System Touch up on New Hand BrakeTouch up on New Hand Brake Test on paraplegic subjectTest on paraplegic subject Create Poster PresentationCreate Poster Presentation Write Final PaperWrite Final Paper
Special ThanksSpecial Thanks
Mark SingerMark Singer Kenton DickersonKenton Dickerson Dr. Steven CouchDr. Steven Couch Dr. Paul KingDr. Paul King Karen FullerKaren Fuller
Contacts Contacts andand Relevant Information Relevant Information
Advisor - Dr. Couch, M.D.Advisor - Dr. Couch, M.D.– [email protected]@mcmail.vanderbilt.edu– Vanderbilt Stallworth Rehabilitation Hospital, MS Vanderbilt Stallworth Rehabilitation Hospital, MS
ClinicClinic– (615) 963 - 4000(615) 963 - 4000
Subject - Mark SingerSubject - Mark Singer– [email protected]@eastersealstn.com– Easter Seals TennesseeEaster Seals Tennessee– (615) 292 - 6640, ext. 104(615) 292 - 6640, ext. 104
Our website: Our website: http://vubme.vuse.vanderbilt.edu/group14_99/http://vubme.vuse.vanderbilt.edu/group14_99/
