- A design concern is a specific aspect or consideration that needs attention during the design process.
- If the design concern is a requirement, the requirement lists the value of the assessment measure that must be achieved.
- If the design concern is a goal, there is not a certain value. Instead, it is the desired direction of the assessment measure in order to come closer to achieving the goal.
| DESIGN CONCERNS CATEGORIES | DESIGN CONCERNS | ASSESSMENT MEASURES | ||
| DEFINITION | REQUIREMENT | GOAL | ||
| Physical | Lightweight | Weight of walker (lb) | XXX | minimum |
| Structural | Fatigue | Resistance to failure during cyclic loading (ISO 1119-1:1999) | Load of 800N at 200,000 cycles and 1 Hz | XXX |
| Static Leg Strength | Load is applied 10mm above bottom of leg directed towards the center of the frame. Load force is applied gradually over 2s and held for 5s. (ISO 1119-1:1999) | 300-500N | XXX | |
| Seat Strength | Ability to support at least 350 lbs (Medicare A52503) | 350lb during Three Point Bend Test | XXX | |
| Stability | Tilt frame at different angles forward, backward, and sideways with a vertical load (ISO 1119-1:1999) | 250 N | XXX | |
| Environmental | Water Resistant | Flexural strength (ASTM D790) retained after being submerged in water for 24 hours (%) | 90 | XXX |
| UV Resistance | Flexural strength following extended period of UV exposure (%) (ASTM G154, 3 day test) | 90 | XXX | |
| Human Engineering | Ergonomics | Misalignment of hand to wrist that causes least amount of strain | XXX | minimum |
| Accessibility to controls | Distance hand has to travel to engage gears and/or brake (in) | XXX | minimum | |
| Life Cycle | Warranty | Duration of warranty | Lifetime | XXX |
| Cost | Affordable price | Cost before Medicare Coverage (80%) | $450 | minimum |
Updated 04/23/2024