Slide 1Slide 2Slide 3National StudentDesign Competition:Wheelchair PlatformDeviceSlide 8AbstractProblem StatementBackgroundDesign CriteriaSlide 13Design ComponentsMarket Research FindingsFinal Design: Underside of upper platformFinal Design: Bottom frame and lifting mechanismFinal Design: Side view of rotation and lifting mechanismsFinal Design – In useFinal Design: In transportSlide 21Learning ExperienceCost TableSpecial Thanks To:AuthorsAuthorsJoel RotrofJoel RotrofBen MogaBen MogaTom PearceTom PearceHani Bou-ReslanHani Bou-ReslanBME 402BME 402April 30th, 2004April 30th, 2004National StudentNational StudentDesign Competition:Design Competition:Wheelchair PlatformWheelchair PlatformDeviceDeviceAdvisorAdvisorMitch TylerMitch TylerDepartment of Biomedical EngineeringDepartment of Biomedical EngineeringClientsClientsFrank FronczakFrank FronczakDepartment of Biomedical EngineeringDepartment of Biomedical Engineering&&Jack WintersJack WintersJohn EnderleJohn EnderleNational Design Student CompetitionNational Design Student CompetitionAbstractAbstractHospitals and clinics require a method to provide elevation and rotation to wheelchair patients. Currently there is no existing device that is capable of providing this movement. The goal of this project is to create a transportable platform that is capable of lifting the wheelchair and its occupant 3 to 9 in. above ground level and provide 360 rotation. The device needs to be controlled by either the patient or doctor.Problem StatementProblem StatementIt can be difficult for wheelchair It can be difficult for wheelchair patients to be positioned for patients to be positioned for diagnosis. A platform device is diagnosis. A platform device is desired that enables wheelchair users desired that enables wheelchair users access to health care procedures. The access to health care procedures. The device should have two-degrees of device should have two-degrees of freedom (rotation of 360° and vertical freedom (rotation of 360° and vertical translation from 3-9 in. above the translation from 3-9 in. above the floor). It should be motorized, floor). It should be motorized, transportable, easy to use, and safe.transportable, easy to use, and safe.BackgroundBackground•Designed for health Designed for health care setting:care setting:•dentist’s office dentist’s office •hospitalhospital•No existing deviceNo existing device•Closest examples Closest examples allow only for allow only for vertical translationvertical translation•$2000 grant $2000 grant awardedawarded(Adaptative Engineering 2003)Design CriteriaDesign CriteriaDevice must:Device must:•elevate 3 - 9 in. and rotate 360°elevate 3 - 9 in. and rotate 360°•achieve max. height in 7 secondsachieve max. height in 7 seconds•rotate 360° in 15 secondsrotate 360° in 15 seconds•lock wheelchair in position for lock wheelchair in position for safetysafety•operate using battery poweroperate using battery power•meet safety regulationsmeet safety regulationsDesign CriteriaDesign Criteria•be easily cleanedbe easily cleaned•transport by rollingtransport by rolling•operate quietlyoperate quietly•withstand loads up to 500 lbswithstand loads up to 500 lbs•move smoothly and safelymove smoothly and safely•be operated easily by patient be operated easily by patient and doctorand doctorDesign ComponentsDesign Components•Base: Provide structural support to the upper-half of the platform during normal operation. •Upper frame: Support the circular disk and transmit load to the lifting mechanisms. •Lifting mechanism: Allow the upper frame to translate vertically and provide the necessary support to maintain elevation. •Transportation features: Allow the device to be easily transported from one location to the other.Market Research FindingsMarket Research Findings•Wheelchairs disrupt most Wheelchairs disrupt most imaging systemsimaging systems•Does not reduce potential law Does not reduce potential law suits and insurance costssuits and insurance costs•Lack of rotation on a third axis Lack of rotation on a third axis reduces market potentialreduces market potential•Result: Not a marketable productResult: Not a marketable productFinal Design: Underside Final Design: Underside of upper platformof upper platformFinal Design: Bottom frame Final Design: Bottom frame and lifting mechanismand lifting mechanismFinal Design: Side view of Final Design: Side view of rotation and lifting rotation and lifting mechanismsmechanismsFinal Design – In useFinal Design – In useFinal Design: In transportFinal Design: In transportLearning ExperienceLearning Experience•Specific prototype variationsSpecific prototype variations- - Rotate internal structure 90 Rotate internal structure 90 degreesdegrees- Extend range and - Extend range and reduce lifting forcereduce lifting force- Alignment - Alignment issues= amateur craftsmenissues= amateur craftsmen•Aspects of getting a project to Aspects of getting a project to marketmarket•Importance of producing a Importance of producing a prototypeprototypeCost TableCost TableComponent AmountPriceStructural steel platform 32 x 36 x 0.25 in.1 194.37Solid steel arms 11.5 x 1.25 x 0.5 in.8 61.35Bearings + Bushings 6 110.26Steel tubing 48 ft. of 1.25 x 2 in. 1 96.44Stainless steel rod 0.625 in. diameter1 28.12Steel Brace 1 60.61Hydraulic cylinders (2500 psi) 2 500.16Hydraulic motor (2500 psi) 1 257.84E-rings, superglue and shiny primer1 18.67Rechargeable battery + Charger + Starter1 188.38Additional components - 427.64Approximate Total - 1943.84Special Thanks To:Special Thanks To:•ME Shop (including staff)ME Shop (including staff)•Frank FronzcakFrank Fronzcak•Mitch TylerMitch Tyler•Glenn BauerGlenn Bauer•Corrine BahrCorrine Bahr•National Design Competition (NIDRR)National Design Competition (NIDRR)•Tong Prototype & Schoofs Tong Prototype & Schoofs
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