Suggesting a Usability Guideline for the Robot-assisted Gait Training System through the Usability Evaluation
TimeThursday, April 152:00pm - 3:00pm EDT
LocationMedical and Drug Delivery Devices
DescriptionBackground: When developing the robot-assisted gait training (RAGT) system, it is important to consider the context of use by a physical therapist who is the main user of the system. However, considering the user perspective in the development of the medical device is still foreign to many engineers, especially in the medical device industry of South Korea.
Objective: In this study, we conducted a contextual inquiry in the robotic rehabilitation room and a usability evaluation with 23 physical therapists, to identify therapists’ perspectives and usability issues of the subject device.
Methods: Based on the results of the contextual inquiry, the main tasks of the user were analyzed into following: (1) therapist helping a patient boarding on the device from a wheelchair, (2) therapist proceeding the gait training while caring a patient, and (3) therapist helping a patient boarding off the device and sitting on a wheelchair. The scenario for the usability evaluation was developed using main tasks and the questionnaire and post-test interviews were given to participants after each evaluation session. The use difficulties and errors are reported for each task as results of the evaluation and their root causes are analyzed to distinguish the user interface components that users would feel difficulty in use.
Results and Analysis: The root causes are then categorized into the following cases: (1) how the device works do not meet user’s expectations on the device, (2) what the device requires users to do exceed the therapist’s physical capabilities, and (3) how the device works exceed patient’s physical capabilities. Analysis of the root causes told us that some user interface components of the RAGT system induce users to commit serious use errors inevitably by the nature of its design.
Conclusion: To prevent such use errors, this study suggests a brief usability guideline for the development of the robot-assisted gait training system that can satisfy user needs in terms of usability.