36 CFR Part 1195 Proposed Accessibility Standards for Medical Diagnostic Equipment NPRM - Preamble

Standing Supports (M304.3 and M305.3)

M304.3 would require standing supports to be provided on each side of the standing surface on diagnostic equipment used by patients in a standing position. M305.3 would require the standing supports to provide continuous support throughout the use of the diagnostic equipment and to not rotate within their fittings.

M305.3 also provides technical criteria for standing supports in horizontal and vertical positions. Standing supports can be provided in a horizontal position, vertical position, or a combination of horizontal and vertical positions, as long as the minimum length of gripping surface is provided for the support position used on each side of the standing surface. Standing supports that adjust from horizontal to vertical positions and at angles in between, such as a bar that folds up and locks into multiple positions, can be used. These kinds of adjustable supports are not required but would accommodate a broad range of patients with disabilities, particularly where a patient needs to assume multiple body positions for a diagnostic procedure or needs to step up onto a surface and then maintain balance afterwards.

For standing supports in a horizontal position, M305.3.1 would require the gripping surface to be 4 inches long minimum. The top of the gripping surface would be required to be 34 inches minimum and 38 inches maximum above the standing surface. The minimum length of the gripping surface is based on anthropometric data that provides specifications for men and women grasping cylinder grips which are stated as a range from 3.6 inches to 4.5 inches. See Henry Dreyfuss Associates and Alvin R. Tilley, The Measure of Man & Woman: Human Factors in Design, (New York, John Wiley and Sons, 2002), page 43. Where possible, it is recommended that a longer gripping surface or multiple horizontal supports be provided. The minimum and maximum height of the gripping surface above the standing surface is based on the provisions for handrails in the 2004 ADA and ABA Accessibility Guidelines.

For standing supports in a vertical position, M305.3.2 would require the gripping surface to be 18 inches long minimum. The bottom of the support would be required to be 34 inches minimum and 37 inches maximum above the standing surface. The minimum length of the gripping surface is based on provisions for vertical grab bars at accessible bathing fixtures and toilets in ICC A117.1‒2009 Accessible and Usable Buildings and Facilities. The minimum and maximum height of the bottom of the support above the standing surface is based on anthropometric data for the 1th percentile woman (minimum) and the 99th percentile man (maximum). See Henry Dreyfuss Associates and Alvin R. Tilley, The Measure of Man & Woman: Human Factors in Design, (New York, John Wiley and Sons, 2002), pages 13, 14, and 28.

Question 38. Comments are requested on the following questions regarding standing supports for diagnostic equipment used by patients in a standing position:

a) What standing support configurations are currently provided and are they effective for patients with disabilities?

b) Would alternative technical criteria for standing supports be appropriate? Comments should include information on sources to support the alternative technical criteria, where possible.

c) Are angled standing supports effective for patients with disabilities and should technical criteria be provided for angled standing supports? Comments should include information on sources to support the technical criteria for angled standing supports, where possible.

d) Are there industry standards for the structural strength of standing supports?

The 2004 ADA and ABA Accessibility Guidelines specify the following dimensions for grab bars to enable individuals with disabilities to firmly grasp the grab bars and support themselves during transfers:

• Grab bars with circular cross sections must have an outside diameter of 1¼ inches minimum and 2 inches maximum.

• Grab bars with non-circular cross sections must have a cross section dimension of 2 inches maximum and a perimeter dimension of 4 inches minimum and 4.8 inches maximum. The Access Board is considering whether the above cross section dimensions would be appropriate for the gripping surfaces of standing supports on diagnostic equipment used by patients in a standing position.

Question 39. Comments are requested on the following questions regarding the above cross section dimensions for the gripping surfaces of standing supports on diagnostic equipment used by patients in a standing position:

a) Can the gripping surfaces of standing supports on different types of equipment meet the above cross section dimensions?

b) Are there alternative designs for the gripping surfaces of standing supports that enable patients with disabilities to firmly grasp the supports?

The Access Board is also considering whether a 1½ inches minimum clearance around the gripping surface of standing supports would be appropriate to ensure that the surface can be grasped.

Question 40. Can standing supports on different types of equipment provide 1½ inches minimum clearance around the gripping surface without encountering obstructions?