for observation and treatment of PATIENTS. USE ERRORS caused by inadequate MEDICAL ELECTRICAL EQUIPMENT USABILITY have become an increasing cause for concern. The USABILITY ENGINEERING PROCESS is intended to achieve reasonable USABILITY, which in turn is intended to minimisen USE ERRORS and to minimise use associated RISKS. Some, but not all, forms of incorrect use are amenable to control by the manufacturer. The USABILITY ENGINEERING PROCESS is part of the PROCESS of RISK CONTROL.
This Collateral Standard describes a USABILITY ENGINEERING PROCESS, and provides guidance on how to implement and execute the PROCESS to provide MEDICAL ELECTRICAL EQUIPMENT SAFETY. It is intended to be useful not only for manufacturers of MEDICAL ELECTRICAL EQUIPMENT , but also for technical committees responsible for the preparation of particular standards.
1.202.3 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
IEC 60601-1:1988, Medical electrical equipment – Part 1: General requirements for safety
Amendment 1 (1991)
Amendment 2 (1995)
IEC 60601-1-8:2003, Medical electrical equipment – Part 1-8: General requirements for safety – Collateral standard: General requirements, tests and guidance for alarm systems in medical electrical equipment and medical electrical systems
ISO 14971:2000,
Medical devices – Application of risk management to medical devices
Amendment 1 (2003)
2 Terminology and definitions
For the purpose of this collateral standard, the terms and definitions given in Clause 2 of IEC 60601-1:1988, as amended by the other collateral standards, Clause 3 of
ISO 14971:2000 and the following apply.
NOTE An Index of all defined terms used in this collateral standard is found at the end of the document
2.201
ABNORMAL USE
intended act or intended omission of an act by the USER or OPERATOR of EQUIPMENT as a result of conduct that is beyond any reasonable means of RISK CONTROL
by the manufacturer
NOTE 1 See also Annex BBB. Examples are given in Annex
NOTE 2 It is possible for the PATIENT to be the OPERATOR, e.g. when EQUIPMENT is used in the PATIENT’S home
NOTE 3 A BNORMAL USE is not considered REASONABLY FORESEABLE MISUSE
2.202 EFFECTIVENESS
accuracy and completeness with which OPERATORS achieve specified goals
[ISO 9241-11:1998, definition 3.2, modified]
2.203 EFFICIENCY
resources expended in relation to the accuracy and completeness with which OPERATORS achieve goals
[ISO 9241-11:1998, definition 3.3 modified]
2.204
*OPERATOR-EQUIPMENT INTERFACE means by which the OPERATOR and the EQUIPMENT communicate
[ANSI/AAMI/HE 74:2001, definition 3.24 modified]
NOTE The ACCOMPANYING DOCUMENTS are considered part of the EQUIPMENT and the OPERATOR-EQUIPMENT INTERFACE.
2.205
OPERATOR PROFILE
summary of the mental, physical and demographic traits of the intended OPERATOR population, as well as any special characteristics that can have a bearing on design decisio ns, such as occupational skills and job requirements
2.206
*PRIMARY OPERATING FUNCTION
function that involves OPERATOR interaction that is either frequently used or related to the SAFETY of the EQUIPMENT in NORMAL USE
2.207
*REASONABLY FORESEEABLE MISUSE
use by the OPERATOR in a way not intended by the manufacturer but which can result from readily predictable human behaviour
[ISO/IEC Guide 51:1999, definition 3.14, modified]
NOTE 1 REASONABLY FORESEEABLE MISUSE is an intended action.
2.208
TRAINING application-specific OPERATOR-oriented instruction or exercises required for the safe and effective use of the EQUIPMENT
2.209
USE ERROR
act or omission of an act that has a different EQUIPMENT response than intended by the manufacturer or expected by the OPERATOR
NOTE 1 USE ERROR includes slips, lapses, mistakes, and REASONABLY FORESEEABLE MISUSE.
NOTE 2 See also Annex BBB and DDD.1.3.
NOTE 3 The physiological response of the PATIENT is not considered part of USE ERROR.
2.210
USE SCENARIO
sequence of events and tasks used to specify and test the USABILITY of the EQUIPMENT
2.211
*USABILITY
Characteristic that establishes EFFECTIVENESS, EFFICIENCY and OPERATOR learnability and satisfaction
2.212
USABILITY ENGINEERING
application of knowledge about human behaviour, abilities, limitations, and other characteristics to the design of tools, machines, EQUIPMENT, devices, systems, tasks, jobs,
and environments to achieve adequate USABILITY
2.213
*USABILITY ENGINEERING FILE
set of RECORDS and other documents that are produced by USABILITY ENGINEERING activities
2.214
USABILITY SPECIFICATION documentation defining the OPERATOR-EQUIPMENT INTERFACE requirements related to USABILITY
2.215
VALIDATION confirmation, through the provision of objective evidence, that the requirements for a specific intended use or application have been fulfilled
NOTE 1 The term “validated” is used to designate the corresponding status.
NOTE 2 The use conditions for VALIDATION can be real or simulated.
[ISO 9000:2000, definition 3.8.5]
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