Integrated Transport System for Children with CP Gayathri Srinivasan Partners: David Dwight & Joseph Tejan Client: Jennifer Miros
NEED & SCOPE
Cerebral Palsy Cerebral Palsy is a neurological condition that affects movement and coordination There is no cure There are treatments for pain, and ambulatory devices that aim to increase a patient’s independence
Goal To design an integrated wheelchair/walker/cane system for a 12-year-old that is easily transported, intuitive, and functional.
Design Requirements Weight Capability >90 kg Lightweight < 30 kg Portability Collapsible and compact Intuitive to Convert Easily to convert between devices Functionality Must function equally well as a walker, wheelchair, and cane Comfort Can be used for long periods of time Safety Consider tipping forward and sideways Cost < $3000 for entire system
CHOSEN DESIGN
WHEELCHAIR
WHEELCHAIR
WHEELCHAIR Zippie’s Pediatric Tilt- in-Space Wheelchair
CANE
CANE
CANE
WALKER
WALKER
WALKER
WALKER
LEG-DISK ROTATION SYSTEM
LEG-DISK ROTATION SYSTEM
WALKER
WALKER
SAFETY ANALYSIS
STRESS ON LEG-DISK ROTATION SYSTEM
FORCE OF A PERSON TIPPING
TIPPING FORWARD
TIPPING SIDEWAYS
MANUFACTURING
MATERIALS TOTAL WEIGHT: 25.54 kg Part Material Advantages Walker & Cane Frames 6061-T6 Aluminum Strong, Lightweight, Cheap, Durable Walker & Cane Handles NVPC Foam Comfort, Elasticity, Custom Moldable Wheels Rubber Durability, Versatility Part Weight Manufacturing Method Wheelchair 22.68 kg Contract Walker 2.49 kg Die Casting Cane 0.37 kg TOTAL WEIGHT: 25.54 kg
COST TOTAL COST: $2280
COST Prototype Mass Production (100 units) Total Cost: $2280 Lead Time: 4 weeks Mass Production (100 units) Total Cost $228000 Lead Time: 6 weeks
CONCLUSIONS
SPECIFICATIONS MET Weight Capability >90 kg ✅ Product Weight Portability Collapsible and compact Intuitive to Convert Easy to convert between devices Functional Must function equally well as a walker, wheelchair, and cane Comfort Can be used for long periods of time Safety Consider tipping forward and sideways Cost < $3000 for entire system
FUTURE DIRECTIONS Ensure the system is fully collapsible Make the system adjustable to fit a growing child Add a storage bag to the wheelchair
LESSONS LEARNED How to use CAD To not get attached to a design idea before working out all of its kinks Limit scope (especialneeds.com)
ACKNOWLEDGEMENTS Dr. Klasner Rebecca Gilson Jennifer Miros
SOURCES http://www.canchild.ca/en/aboutcanchild/resources/gmfcs.pdf http://www.phc-online.com/Tilt_in_Space_Wheelchair_p/quickie-zippie-ts.htm http://manufacturing.materialise.com/stereolithography https://www.solidconcepts.com/technologies/selective-laser-sintering-sls/ http://www.stratasys.com/3d-printers/technologies/fdm-technology https://thre3d.com/how-it-works/binder-jetting http://www.efunda.com/processes/metal_processing/sand_casting_intro.cfm http://www.thomasnet.com/articles/custom-manufacturing-fabricating/die-casting-types http://www.quickparts.com/lowvolumeprototypes/cnc.aspx http://www.grainger.com/
QUESTIONS? Thanks for listening!