The pt was placed into specialized shorts for the alter-g treadmill and assisted into the device.Pt stood in treadmill / device with the support bar raised and locked and the shorts attached to the device per protocol.The device was inflated to 100% to offload the pt's weight while standing.As the device inflated with air, pt heard and felt a rush of air escape from the machine; unable to determine immediately the source of the escaping air.Pt stood comfortably for a short period while adjustments were being made, and then she was unable to keep her footing as the treadmill band moved.Pt was unable to support her weight and her legs were no longer under her body, the alter-g did not support her weight as intended.She began to sink lower within the support beams and needed assistance from staff to safely get her out of the device.Fda safety report id# (b)(4).
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