To Support Outbreak of Pandemic Caused by COVID-19: A Low Cost Lightweight Modular Design of a Semi-autonomous Wheelchair

Votes: 1
Views: 48
Medical

A) Problem Statement:
The world is facing a major crisis to handle COVID-19, considering following key problems of our society:

  • Worldwide pandemic 
  • Exponential spread & growth of COVID-19 positive cases, deaths and its fear & absolute halt of economic growth
  • Maintain social distancing
  • High demand for medical equipment in bulk quantity & crisis of its availability to handle the situation
  • Additionally need of wheelchair for every patient visiting the hospital with or without COVID-19 – old aged people, handicapped, people needed assistance.

India and world need equipment which will aid medical systems to make it efficient, low cost solution faster & automated equipment with safety and importantly to maintain social distancing, so I innovated to design and manufacture this wheelchair.

B) Innovative Solution of Wheelchair:

  1. Key Features
  • Wheelchair designed for usage at hospital/dispensary/COVID centers
  • Semi-automated wheelchair driven with joystick
  • Embedded mechanism to climb wheelchairs automated on stairs
  • Automated obstacle detection
  • Portable 
  • Lightweight design with no welding. Standard tubes are used to bolt and assemble.
  • IOT based alert system for location
  • Ultrasonic sensor based braking system with Arduino
  • IOT based alert for safety -- alert to family/medical staff when collision
  • Electric battery operated wheelchair
  • Option to charge battery with solar
  • 20 hours endurance per battery charge with minimum 10 KMPH

C) Stages/Methodology adopted in design & life cycle of wheelchair:

  1. Stage-I: Concept of Model Based System Engineering (MBSE) followed:
    • carried system approach Requirement Management, Functional Analysis Logical Analysis and then Physical Design
    • Innovative features are included in design as listed above in key features.
    • We studied requirement of hospital for wheel chair, their challenges of hospital staff, outdoor and indoor patients
    • Carried benchmarking of similar products
    • Developed ‘Make or Buy’ strategy on sub-systems, components & supply chain
    • And then finalised features and function iteratively
  2. Stage-II: Product Technical Specification at glimpse finalised:
    • Weight of Wheelchair: 25 Kg
    • Weight Wheelchair can hold: 90 Kg
    • DC Motor: 400 W, 3000 RPM
    • Battery: 12V, 600Ah
    • Discharging Time: 20 Hour after full charge
    • Maximum Speed: 35 Km/h
    • Minimum Speed: 10 Km/h
    • Charging time: 5 Hour from 0% to 100%
    • Others: IOT, Joystick, mechanism for climbing, Braking system, safety
  3. Stage-III: Product Design – Using various apps of CATIA
    • Designed various mechanical components of wheelchairs – Tire, Hand rest, Frame, Wheels, seat, Joystick, braking systems, Rim, Back rest, stair climbing mechanism, fasteners etc. and developed 3D CAD model
    • Also designed electrical sub-systems – LED light, Battery, Motors, charging point, controller, sensors
    • Parametric & Features based design is carried
    • Bill of materials preparation & drawing for manufacturing
    • Rendering of product and its parts/subsystems along with material assignment
    • It was very complex to design product with intended objectives.

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  • ABOUT THE ENTRANT

  • Name:
    Abhinav Kumar Sah
  • Type of entry:
    individual
  • Profession:
    Engineer/Designer
  • Abhinav Kumar is inspired by:
    Impact & Sustainability:
    This product will impact highly our society to make use of wheel chair and its features at low cost solution on validating prototype and manufacturing.
    It is driven by electric vehicle/battery which support our NO pollution and Go-GREEN mission of Sustainability and save/protect energy
  • Software used for this entry:
    3D Experience platform by Dassault Systems
  • Patent status:
    none