Power Assist Device Screen with Graphical User Interface

FIG. 1 is a display screen or portion thereof showing a graphical user interface for a power assist device, according to a first embodiment of the invention; FIG. 2 is another embodiment of the graphical user interface of FIG. 1 ; and, FIG. 3 is a front view of a power assist device having a display screen with the graphical user interface of FIG. 1 . The graphical user interface of FIG. 2 may be similarly applied thereto. The broken lines showing a device screen and elements of the graphical user interface illustrate portions of the article and form no part of the claimed design. The additional broken lines in FIG. 3 showing the power assist device illustrate environmental subject matter, and form no part of the claimed design.