In this work, we introduced a novel acoustofluidic device combining the advantages of solid and bubble-based features and demonstrated its use for particle and single-cell manipulation as well as microfluidic applications. We numerically investigated different geometrical design parameters and derived their complex relationship to the acoustically generated streaming pattern. Then, following noticeable fabrication improvements, we successfully confirmed our observations through experimental characterisations. Optimum device performance with regards to its out-of-plane rotation capabilities has been numerically determined for a microbubble length of 500 µm, wall width of 5 µm, and fluid channel width of 150 µm.