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BS ISO 16840-12:2021

BS ISO 16840-12:2021

$142.49

Wheelchair seating – Envelopment and immersion characterization of seat cushions using a dual semispherical indenter

Published By Publication Date Number of Pages
BSI 2021 24
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This document specifies apparatus, test methods, and disclosure requirements for characterization of wheelchair seat cushion immersion and envelopment properties using indenters instrumented with pressure sensors.

This document expands the characterization of products intended to manage tissue integrity ( ISO 16840-2 ) and provides a standardized indenter for other wheelchair seating tests.

It does not provide information specific to cushion performance for a particular individual user, nor is it intended to characterize envelopment or immersion under higher loading conditions, nor to assess the weight capacity of a cushion.

This document includes a method that is specific to 220 mm and 255 mm indenters. Dimensions are provided for a 380 mm indenter to allow for extension of the method to larger patient simulation.

PDF Catalog

PDF Pages PDF Title
2 National foreword
6 Foreword
7 Introduction
9 1 Scope
2 Normative references
3 Terms and definitions
10 4 Indenter construction
4.1 Materials
4.2 Tolerances and finishes
4.3 Indenter elements
4.3.1 Trochanter bar
11 4.3.2 Trochanter blocks
12 4.3.3 Semispherical indenter half
13 4.4 Indenter assembly
14 4.5 Sensor locations
4.5.1 General
15 4.5.2 Elevation a
4.5.3 Elevation b
4.5.4 Elevation c
4.5.5 Elevation d
16 5 Instrumentation hardware
5.1 Sensors
5.2 Timer
5.3 Loading equipment
5.4 Rigid board
6 Preparation of test cushion
6.1 Cushion set up
17 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 Seat cushion thickness measurement
18 7.2.4 Load application and data collection
19 7.3 Calculations
7.3.1 Envelopment
20 7.3.2 Immersion
8 Test report
22 Annex A (informative) Estimate of measurement uncertainty
23 Bibliography

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BS ISO 16840-12:2021
$142.49