Recommendations on Standards for the Design of Medical Diagnostic Equipment for Adults with Disabilities, Advisory Committee Final Report

5.4.6 Transfer Support Gripping Surface Cross Section and Clearances for M301, M302, and M305.2

Description: This provision prescribes a cross-sectional profile of the transfer support sufficient to enable individuals with disabilities to firmly grasp the gripping surface and support themselves during transfers. The provision addresses gripping surface diameter and perimeter of the support.

NPRM Proposed Provision: gripping surface cross section not addressed.

NPRM Preamble Discussion: The 2010 Standards 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 transfer supports on diagnostic equipment used by patients in a supine, prone, or side-lying position, and diagnostic equipment used by patients in a seated position.

The Committee recommends following the provisions for gripping surface cross section configurations contained in the 2010 Standards.

Rationale for the recommendation

The cross section dimensions contained in the 2010 Standards used for grab bars found in the built environment are those contemplated for use in MDE. The Committee expressed confidence in reliance on the cross-section dimensions in the 2010 Standards. Allowing both noncircular cross sections and circular cross sections gives manufacturers flexibility to employ the best configuration for use of the equipment, hand, grip strength, and power grab functions. While a majority of the Committee members supported a recommendation allowing both noncircular and circular cross sections, some members noted ergonomic considerations support the better functionality of circular cross section gripping surface.

Figure 5.4.6(a) Gripping Surface Circular Cross Section
(SOURCE: U.S. Access Board)

Figure 5.4.6(b) Gripping Surface Non-Circular Cross Section
(SOURCE: U.S. Access Board)