ISO 16840-2:2018
Wheelchair seating — Part 2: Determination of physical and mechanical characteristics of seat cushions intended to manage tissue integrity
ISO 16840-2:2018 specifies apparatus, test methods and disclosure requirements for wheelchair seat cushions intended to maintain tissue integrity and prevent tissue trauma. Test conditions simulate a symmetric anatomy and posture and do not represent cushion performance for specific individual users. Loads are intended to represent those seen under the pelvis of a 50th percentile wheelchair user and are not intended to assess the weight capacity of the cushion or to characterize the cushion under bariatric loads. It is possible that not all test methods apply to existing and future cushion technologies. It does not include test methods or requirements for determining the fire resistance of cushions.
ISO 16840-2:2018 can also be applicable to tissue integrity management devices used as other support systems, as well as to cushions used in situations other than a wheelchair.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviated terms
5 Apparatus
6 Preparation of test cushion
6.1 Choice of cushion
6.2 Preconditioning the cushion
6.3 Setup
7 Sequence of testing
8 Frictional properties
8.1 Rationale
8.2 Test method
8.3 Test report
9 Impact damping under normal loading conditions
9.1 Rationale
9.2 Test method
9.3 Method of calculation
9.4 Test report
10 Recovery
10.1 Rationale
10.2 Test method
10.3 Test report
11 Loaded contour depth and overload deflection
11.1 Rationale
11.2 Test method
11.3 Method of calculation
11.4 Test report
12 Water spillage
12.1 Rationale
12.2 Test method
12.3 Test report
13 Biocompatibility
13.1 Rationale
13.2 Test method
13.3 Test report
14 Hysteresis test
14.1 Rationale
14.2 Test method
14.3 Method of calculation
14.4 Test report
15 Test report
16 Disclosure requirement
Annex A (normative) Tapered uniform geometry RCLI
Annex B (informative) Typical ranges for ISO 16840-2 tests and indicative cushion implications
Annex C (informative) Horizontal stiffness and sliding resistance
Annex D (informative) RCLIs for testing of alternatively sized cushions
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviated terms
5 Apparatus
6 Preparation of test cushion
6.1 Choice of cushion
6.2 Preconditioning the cushion
6.3 Setup
7 Sequence of testing
8 Frictional properties
8.1 Rationale
8.2 Test method
8.3 Test report
9 Impact damping under normal loading conditions
9.1 Rationale
9.2 Test method
9.3 Method of calculation
9.4 Test report
10 Recovery
10.1 Rationale
10.2 Test method
10.3 Test report
11 Loaded contour depth and overload deflection
11.1 Rationale
11.2 Test method
11.3 Method of calculation
11.4 Test report
12 Water spillage
12.1 Rationale
12.2 Test method
12.3 Test report
13 Biocompatibility
13.1 Rationale
13.2 Test method
13.3 Test report
14 Hysteresis test
14.1 Rationale
14.2 Test method
14.3 Method of calculation
14.4 Test report
15 Test report
16 Disclosure requirement
Annex A (normative) Tapered uniform geometry RCLI
Annex B (informative) Typical ranges for ISO 16840-2 tests and indicative cushion implications
Annex C (informative) Horizontal stiffness and sliding resistance
Annex D (informative) RCLIs for testing of alternatively sized cushions
Bibliography