Figure 3-29-31 Mistake-Proofing the Design of Health Care Processes - Figure 3.29. Wheelchair with heel strap Return to Document Figure 3.30. Wheelchair with leg strap Return to Document Figure 3.31. The footplate can be released and moved to the side Return to Document Current as of May 2007 Internet Citation: Figure 3-29-31: Mistake-Proofing the Design of Health Care Processes -. May 2007. Agency for Healthcare Research and Quality, Rockville, MD. http://www.ahrq.gov/professionals/quality-patient-safety/patient-safety-resources/resources/mistakeproof/mistakefig3-29-31.html