US Patent 7160280 Diaper with segregated reservoir

A diaper with an integral feces receiver. This receiver is connected to the interior of the diaper by an oval opening. The walls of the receiver are undercut so that the cross-section expands as the fecal matter moves from the opening downward. A thickened supporting section is provided around the receiver so that the user's weight will not force the solid material out of the receiver and back into the interior of the diaper. The fecal matter is thereby contained within the receiver and away from the user. A layered version is shown, in which the diaper's structure is built from a series of stacked cross sections.