Abstract: A face mask comprising a pleated laminate having means to secure said laminate over the nose and mouth of the wearer, said laminate comprising a first outer layer of heat sealable facing material, a second inner layer of filtration media, and a third innermost layer of heat sealable facing material, the laminate being folded to create one pleat therein that extends across the entire laminate, each end of the pleat being secured together at the edges of the laminate and the folded edge of the pleat being heat sealed along substantially its entire length securing together the three layers of laminate, and reinforcing the pleat edge such that when the pleat is open, the reinforced pleat edge maintains the laminate away from the mouth and nose of the wearer when worn.

Abstract: A lightweight, disposable face mask for covering the entire face of the wearer, which mask comprises a unitary shell of transparent plastic material having upper and lower portions joined at a ridge which traces the facial respiratory line. A band of flexible material is disposed along the ridge and creates an aerodynamic seal between the upper and lower portions of the mask when worn. A strip of soft, flexible material is secured to the mask along the periphery creating a soft, comfortable seal between the mask and the face of the wearer.

Abstract: A blood treatment apparatus having within a sealed housing a chamber for mixing oxygen and blood, a column of packed beads through which the mixture of oxygen and blood passes to cause oxygenation of the blood, a blood defoamer through which the oxygenated blood must pass, a reservoir into which the defoamed blood passes and a heat-exchanger which occupies a substantial portion of the lower region of the reservoir. The heat-exchanger comprises a stacked array of spirally wound coils being connected at each of its ends to a manifold which is external of the sealed housing. The configuration of the various components and of the walls of the sealed housing are such that the coils provide high heat-exchange effectiveness by optimizing the size and uniformity of the spacing between coils through which the blood must pass.