#25: Elevator Controller for Individual with Multiple Sclerosis Team Members: Michele Lorenz-Team Leader Emily Maslonkowski-Communications Sara Karle-BSAC Ashley Matsick-BWIG

Our Client Our Advisor Dr. John O. Fleming Professor, Vice Chair, Neurology Professor, Medical Microbiology and Immunology University of Wisconsin Medical School fleming@neurology.wisc.edu Our Advisor Professor Naomi Chesler, PhD. Department of Biomedical Engineering University of Wisconsin-Madison

Outline Problem Statement Background: Multiple Sclerosis Client Requirements Designs 1,2,3 Design Matrix Future Work

Problem Statement Design a device capable of covering the distance from wheelchair to elevator buttons Must exert a horizontal pushing force of 35.56N Must be operated remotely (voice activated or with a mouth joystick)

Multiple Sclerosis (MS) Autoimmune disease Symptoms typically occur in early to mid adulthood Immune system attacks myelin Impairs ability of brain to communicate with muscles Muscle atrophy is a secondary effect

Client Requirements Functional in both elevator and hallway environments Provide visual feedback to user of correct device-button contact Weatherproof Zero interference with current chair operation 10 year lifespan, multiple uses/day

Design #1: Robotic Car Three-wheeled base (1) Telescoping rod extending from base (2) Pushing shaft depresses button with car movement (3) 2 3

Design #2: Spring-Loaded Arm top view Wheelchair positioned appropriately Internal catch (1) releases arm (2) Arm rotates on hinge (3) to contact button Motorized return mechanism Vertical adjustment (rack-and-pinion) (4) 2 3 1 4 1 side view side view

Design #3: The Crane Mounted to back of armrest Telescoping rod (1) rotates to adjust to buttons Crank rotates extending arm (2) up and forward Shaft (3) pushes button 2 1 3

Design Matrix Weight Robotic Car Spring-loaded Arm The Crane Accuracy 25 20 15 Ease of operation 18 Durability 7 10 Ease of construction/part replacement 4 8 Estimated Cost 3 Size 9 TOTAL 100 61 69 68

Future Work Narrow parameters necessary for design Merge designs 2 + 3 Construction/testing Long-term: integrate control + docking

Questions?