Product Design of a Toilet-assistance Device for Individuals with Upper Limb Disabilities Based on Scenario-based Design and AHP-QFD

LIAO Li; LI Weili; YANG Chenghao

doi:10.19554/j.cnki.1001-3563.2026.10.013

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Packaging Engineering ›› 2026, Vol. 47 ›› Issue (10) : 142-156. DOI: 10.19554/j.cnki.1001-3563.2026.10.013

Product Design of a Toilet-assistance Device for Individuals with Upper Limb Disabilities Based on Scenario-based Design and AHP-QFD

LIAO Li¹, LI Weili¹, YANG Chenghao^2,*

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Abstract

To address the challenge that individuals with upper limb disabilities often cannot independently complete the critical task of taking off and putting on pants when using the restroom away from home, the work aims to propose the design of toilet-assistance devices adaptable to various scenarios to enhance their ability to manage toileting care autonomously while preserving both their physiological needs and psychological dignity. Interviews and scenario-based design (SBD) methods were employed to delineate the operational steps, pain points, and emotional responses of target users in actual toileting situations, thereby extracting initial need elements and categorizing them based on their inherent attributes. Building upon this, the Analytic Hierarchy Process (AHP) was applied to rank the importance of key needs, and the Quality Function Deployment (QFD) was utilized to map the prioritized needs to critical technical indices and design elements. A comprehensive product design scheme was then proposed and evaluated. Based on the user analysis derived from the combined application of interviews, scenario-based design, and an AHP-QFD process, key needs were identified and subsequently used to design and validate the toilet-assistance device. By adopting a method that combines qualitative needs elicitation with quantitative needs prioritization, an assistive product design scheme with everyday clothing as the carrier is proposed. This research pathway provides a low-cost, easily replicable, need-driven product design strategy for assistive product development targeting vulnerable user groups.

Key words

upper limb disability / user needs / independent toilet-assistance device / scenario-based design / AHP-QFD methodology

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LIAO Li, LI Weili, YANG Chenghao. Product Design of a Toilet-assistance Device for Individuals with Upper Limb Disabilities Based on Scenario-based Design and AHP-QFD[J]. Packaging Engineering. 2026, 47(10): 142-156 https://doi.org/10.19554/j.cnki.1001-3563.2026.10.013

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