Disclosed is a catalyst distributor and process for mixing spent catalyst and recycled regenerated catalyst in a regenerator vessel. The alloy for medical use according to, for example, an embodiment of the present invention is mainly composed of three kinds of elements of gold, platinum, and niobium. The plurality of independently steerable wheel assemblies, each steerable about a steer axis of rotation include one of the plurality of wheel assemblies being designated a master wheel and the remaining wheel assemblies being designated slave wheels. When incorporated into the chewing gum, these particles are adapted to produce a fast release or a delayed release when the gum is chewed.