A method for forming plications of the gastric cavity is achieved by forming a tissue fold along a gastric wall of the gastric cavity and securing the tissue fold with a fastener, wherein the step of securing includes positioning at least one buttress between the tissue of the gastric wall and the fastener. The device moves between an open position for receiving the foreign body and a closed position for capturing the foreign body. The second receptacle receives a portion of the second plurality of leg members therein. 0, and the cobalt oxide contains sodium ions or potassium ions inside the crystal and further fixes lithium hydroxide or lithium ions. In another embodiment, a sinusoidal-shaped implant structure is alternately woven from one end to the other with a second sinusoidal-shaped structure. Furthermore, a process for its preparation and the use of the mixed oxide as electrode material for lithium ion batteries.