BS ISO 16840-12:2021 – TC:2022 Edition

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

Published By	Publication Date	Number of Pages
BSI	2022	56

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Categories: 11.180.10 - Aids and adaptation for moving, BSI

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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
1	30448404
33	A-30424787
34	National foreword
38	Foreword
39	Introduction
41	1 Scope 2 Normative references 3 Terms and definitions
42	4 Indenter construction 4.1 Materials 4.2 Tolerances and finishes 4.3 Indenter elements 4.3.1 Trochanter bar
43	4.3.2 Trochanter blocks
44	4.3.3 Semispherical indenter half
45	4.4 Indenter assembly
46	4.5 Sensor locations 4.5.1 General
47	4.5.2 Elevation a 4.5.3 Elevation b 4.5.4 Elevation c 4.5.5 Elevation d
48	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
49	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
50	7.2.4 Load application and data collection
51	7.3 Calculations 7.3.1 Envelopment
52	7.3.2 Immersion 8 Test report
54	Annex A (informative) Estimate of measurement uncertainty
55	Bibliography