Methods of making silicon carbide comprise providing at least one organosilicon precursor material, hydrolyzing the organosilicon in a solution comprising water and an acid catalyst, providing a surfactant to the solution, forming a gel by adding a base to the solution, and heating the gel at a temperature and for a time sufficient to produce silicon carbide. The method further includes coupling the first end portion to the segment of bone and coupling the second end portion to an anchor bone opposing the source bone. Each sidewall provides at least one elastic flap having an outwardly projecting locking portion. The locking key interacts with the detonator initiating mechanism to preclude an arming of the detonator until the locking key is removed from the detonator initiating mechanism. In a preferred embodiment, the blocking element is a front surface of a carrier of the first blade, a blade part comprising the cutting edge of the first blade being mounted on said carrier.