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Novel pressure-relief wheelchair: research paper

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  1. Nomenclature
  2. Scope
  3. Introduction to pressure ulcers
    1. Pressure sore overview
    2. Pressure sore incident rate and treatment cost
    3. Managing and preventing pressure sores
  4. Problem statement
  5. Design constraints
  6. Design goals
  7. Americans with Disabilities Act
  8. Project schedule
  9. Idea generation
  10. Concept description
    1. Modified standard wheelchair
    2. Modified cart
    3. Ergonomic wheelchair
  11. Design selection
  12. Refinement of the ergonomic wheelchair
  13. Performance analysis
  14. Conclusions
  15. References
  16. Appendices

Pressure sores are painful and debilitating tissue wounds which commonly affect wheelchair users. Current treatment of pressure sores requires bed-rest for up to sixteen weeks, which is unacceptable for patients with active life-styles. The purpose of our project is to design a wheelchair that allows patients with pressure sores to remain active without hindering the healing process. The wheelchair should facilitate activities of daily living (ADL) and distribute pressure evenly to prevent new sore development. The wheelchair design should also be comfortable, adjustable, maneuverable, and competitively priced. It must also conform to industry safety and manufacturing standards.After conducting extensive research and problem assessment, we developed, critiqued, and enhanced three different design concepts. We chose to further develop the ergonomic wheelchair design and constructed a full-scale mockup. We also spent extensive time refining the design features.

[...] Keep the wound moist to promote granulation. Protect the surrounding skin. Manage the patient's overall condition. Track wound-healing progress accurately. (Courtesy of www.amda.com) 4 Problem Statement The purpose of our project is to design a wheelchair that allows patients with pressure sores to remain mobile and active without hindering the healing process Design Constraints The following statements describe the essential project constraints for our development of a pressure-reducing wheelchair. Pressure Relief - Our design must provide complete pressure relief for the ischial region of the body. [...]


[...] Our research was used to develop a comprehensive list of design constraints and goals and to assess our design concepts. This assessment led us to pursue the ergonomic wheelchair design. Once this design was selected, we used a full-scale mockup to gauge its performance and identify unresolved issues. We further refined our design by identifying and developing design concepts for features like angular adjustment, hamstring pad movement, and brakes. Ultimately, the team concluded the twenty-week development cycle by presenting these concepts to our client, Dr. [...]


[...] Figure 7.1 : Minimum Clear Width for Single Wheelchair The minimum clear passage width for a single wheelchair shall be 36 inches minimum along an accessible route, but may be reduced to 32 inches minimum at a point for a maximum depth of 24 inches, such as at a doorway Wheelchair Turning Space The space required for a wheelchair to make a 180-degree turn is a clear space of 60 in diameter. Figure 7.2 : Wheelchair Turning Space 60-in Diameter Space In order to insure foot clearance, a minimum clearance of 2 inches was chosen by our group to be suitable Quality Function Deployment With all the different design criteria that need to be considered we developed a QFD to help us evaluate each of our design constraints and goals. [...]

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