Authors Joel Rotrof Ben Moga Tom Pearce Hani Bou Reslan BME 402 April 30th 2004 National Student Design Competition Wheelchair Platform Device Advisor Mitch Tyler Department of Biomedical Engineering Clients Frank Fronczak Department of Biomedical Engineering Jack Winters John Enderle National Design Student Competition Abstract Hospitals 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 Problem Statement It can be difficult for wheelchair patients to be positioned for diagnosis A platform device is desired that enables wheelchair users access to health care procedures The device should have two degrees of freedom rotation of 360 and vertical translation from 3 9 in above the floor It should be motorized transportable easy to use and safe Background Designed for health care setting dentist s office hospital No existing device Closest examples allow only for vertical translation 2000 grant awarded Adaptative Engineering 2003 Design Criteria Device must elevate 3 9 in and rotate 360 achieve max height in 7 seconds rotate 360 in 15 seconds lock wheelchair in position for safety operate using battery power meet safety regulations Design Criteria be easily cleaned transport by rolling operate quietly withstand loads up to 500 lbs move smoothly and safely be operated easily by patient and doctor Design 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 Findings Wheelchairs disrupt most imaging systems Does not reduce potential law suits and insurance costs Lack of rotation on a third axis reduces market potential Result Not a marketable product Final Design Underside of upper platform Final Design Bottom frame and lifting mechanism Final Design Side view of rotation and lifting mechanisms Final Design In use Final Design In transport Learning Experience Specific prototype variations Rotate internal structure 90 degrees Extend range and reduce lifting force Alignment issues amateur craftsmen Aspects of getting a project to market Importance of producing a prototype Cost Table Component Amou nt Price Structural steel platform 32 x 36 x 0 25 in 1 194 37 Solid steel arms 11 5 x 1 25 x 0 5 in 8 61 35 Bearings Bushings 6 110 26 Steel tubing 48 ft of 1 25 x 2 in 1 96 44 Stainless steel rod 0 625 in diameter 1 28 12 Steel Brace 1 60 61 Hydraulic cylinders 2500 psi 2 500 16 Hydraulic motor 2500 psi 1 257 84 E rings superglue and shiny primer 1 18 67 Special Thanks To ME Shop including staff Frank Fronzcak Mitch Tyler Glenn Bauer Corrine Bahr National Design Competition NIDRR Tong Prototype Schoofs Competition WARF
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