The invention involves a submucosa tissue that has the capability of being shape formed or shape configured. Once installed in a stack of sheets, the spiraling prevents the riveted sheets from mutually separating and the rivet loosening with respect to the sheets. Therefore, at an initial stage of the rotation, an inner wheel and an outer wheel are coupled to each other and rotated together. The present invention also comprises a method for controlling the continuous mixing of slurry while removing entrained bubbles comprising providing a powder and fluid rate control, wherein the powder feeder and fluid rate control is coupled to a mixer through a powder feeder and a liquid pump.