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6.8.3. Mitigation of risks due to excessive joint angle movement
The GEMS‐H joints have mechanical stoppers to restrict over‐extension of joints, as well as software limits on joint
movement. The mechanical stoppers are designed to ensure that the hip joints stay within the specified range even
in the case of a malfunctioning device. The mechanical stoppers are set to a maximum of 110 degrees for flexion and
a maximum of 45 degrees for extension. The delayed output controller (software) is limited to a maximum of 100
degrees for flexion and a maximum of 40 degrees for extension in normal use.
Status of the device and recommended user action:
When the joint angle reaches the joint angle limit, the device alerts the physical therapist by displaying a warning
message of
"EXCEED JOINT
assistive force. Thereafter, the physical therapist may reset the device by asking the patient to stand with upright
posture and tapping the "Set Stand Pose" button on the tablet PC. Pressing the "START" button will then cause the
device to start providing assistive force again.
SAIT‐IFU‐GEMS‐H Rev.1.1 (2019‐11)
LIMIT". When the joint angle reaches these joint limits, the device ceases applying
Error message examples
Page 56 of 79
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