A device frame includes a plurality of elongate frame members (102), first and second hub members (108, 116) substantially aligned along a longitudinal axis of the device frame, and a coupling element (689) that couples the first hub member to the second hub member. The device frame includes a face section (110), a laterally facing skirt section (112), and an inverted section (114). First portions of the elongate members define the face section and extend radially from the first hub member. Second portions of the elongate members define the laterally facing skirt section and extend in a distal, axial, and helical direction along a first rotational direction from the face section. Third portions of the elongate members define the inverted section and extend in a generally proximal direction from a distal portion of the laterally facing skirt section to the second hub member along a rotational direction opposite the first rotational direction.
