Absorptive patient underpad

Claim 1

A disposable patient underpad characterized by: a first liquid impervious bottom layer; a second coextensive liquid absorbing layer disposed on said bottom layer; a third coextensive layer disposed on said liquid absorbing second layer, said third layer composed of a liquid impervious sheet having a plurality of spaced openings extending from face to face thereof; said spaced openings in said third layer being of the order of from about 1 to about 3 mm in cross dimensions and spaced not closer than about 1 cm apart to provide liquid drainage into said second layer and to retard generation of odors in fluids contained in said second layer; and a fourth coextensive hydrophobic closed cell expanded foam body cushioning layer secured to said third layer, said fourth layer having a plurality of openings extending from face to face thereof, wherein the openings in said fourth layer are on the order of from about 1 to about 11/2 cm in cross dimensions and spaced not closer than about 1 cm and said openings in the fourth layer comprising at least about 1/4th the total surface area of said fourth layer and said openings in the fourth layer being vertically aligned with the openings in the third layer, said first, second, third and fourth layers being joined into an integral underpad.