Abstract: Provided herein are synthetic living tissue structures comprising multiple layers of fibers deposited in solidified form from a 3D bioprinter, together with kits and methods of use related thereto. The fibers comprise a plurality of mammalian cells dispensed within a solidified biocompatible matrix. The structural integrity of the fiber is maintained upon and after deposition without any additional crosslinking. The fiber is continuously bioprinted through at least two layers of the structure. In one aspect, synthetic muscle tissue structures exhibit a readily assayable contractile functionality.

Abstract: A circuit board fixing element is provided. The circuit board fixing element is used for fixing a circuit board on a sheet, and includes a fixing portion, a buckling portion, and a connecting portion. The buckling portion is made of a resilient material. The connecting portion is connected between the fixing portion and the buckling portion, and has two opposite ends and a side surface connected to the ends. The fixing portion and the buckling portion are respectively located on the ends and protrude from the side surface.

Abstract: A circuit board fixing element is provided. The circuit board fixing element is used for fixing a circuit board on a sheet, and includes a fixing portion, a buckling portion, and a connecting portion. The buckling portion is made of a resilient material. The connecting portion is connected between the fixing portion and the buckling portion, and has two opposite ends and a side surface connected to the ends. The fixing portion and the buckling portion are respectively located on the ends and protrude from the side surface.