ISO/TS 16840-12:2015
Wheelchair seating — Part 12: Apparatus and method for cushion envelopment testing
ISO/TS 16840-12:2015 specifies apparatus, test methods, and disclosure requirements for characterization of wheelchair seat cushion immersion and envelopment properties using instrumented indenters to characterize the interface pressure of each indenter and the test cushion by measuring the cushioning effects of immersion and envelopment. This part of ISO 16840 can be considered to expand the characterization of products intended to manage tissue integrity (ISO 16840‑2) and provide a standardized indenter for other wheelchair seating tests. It does not provide information specific to cushion performance for a particular individual user.
ISO/TS 16840-12:2015 includes a method that is specific to 220 mm and 255 mm indenters. Dimensions and loads are provided for the 380 mm indenter to allow for extension of the methods for bariatric applications.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Indenter construction
4.1 Materials
4.2 Tolerances and finishes
4.3 Indenter elements
4.3.1 Trochanter bar
4.3.2 Trochanter buttons
4.3.3 Bulbous indenter half
4.4 Indenter assembly
4.5 Sensor locations
4.5.1 General
4.5.2 Elevation1
4.5.3 Elevation2
4.5.4 Elevation3
4.5.5 Elevation4
5 Instrumentation hardware
5.1 Electronics
5.2 Loading equipment
6 Preparation of test cushion
6.1 Cushion adjustment
6.2 Preconditioning the cushion to the test environment
7 Envelopment test method
7.1 Rationale
7.2 Method
7.2.1 Setting the datum height for the indenter
7.2.2 Pre-conditioning the cushion
7.2.3 Measuring the seat cushion thickness
7.2.4 Load application and data collection
7.3 Calculations
8 Test report
Annex A (normative) Method adaptions for cushions that utilize offloading
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Indenter construction
4.1 Materials
4.2 Tolerances and finishes
4.3 Indenter elements
4.3.1 Trochanter bar
4.3.2 Trochanter buttons
4.3.3 Bulbous indenter half
4.4 Indenter assembly
4.5 Sensor locations
4.5.1 General
4.5.2 Elevation1
4.5.3 Elevation2
4.5.4 Elevation3
4.5.5 Elevation4
5 Instrumentation hardware
5.1 Electronics
5.2 Loading equipment
6 Preparation of test cushion
6.1 Cushion adjustment
6.2 Preconditioning the cushion to the test environment
7 Envelopment test method
7.1 Rationale
7.2 Method
7.2.1 Setting the datum height for the indenter
7.2.2 Pre-conditioning the cushion
7.2.3 Measuring the seat cushion thickness
7.2.4 Load application and data collection
7.3 Calculations
8 Test report
Annex A (normative) Method adaptions for cushions that utilize offloading
Bibliography