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A blood oxygenator includes an elongated hollow housing having an elongated chamber therein, an elongated fiber assembly disposed within the chamber along an axis thereof and including a bundle of hollow fibers of a microporous membrane. The opposite ends of the fiber bundle are sealingly secured to

A blood oxygenator includes an elongated hollow housing having an elongated chamber therein, an elongated fiber assembly disposed within the chamber along an axis thereof and including a bundle of hollow fibers of a microporous membrane. The opposite ends of the fiber bundle are sealingly secured to the inner peripheral surface of the housing by a potting material. Gas inlet and outlet members are connected respectively to the opposite ends of the housing and communicate respectively with the opposite ends of the hollow fibers. Blood inlet and outlet are formed on the housing and communicate with the chamber intermediate the opposite ends of the hollow fibers. The fiber assembly includes a plurality of layers of spirally-wound fiber bundles arranged one upon another. Each turn of one of each adjacent spirally-wound bundles is disposed in a plane intersecting the plane in which each turn of the other fiber bundle is disposed. The outer periphery of the outermost layer of the spirally-wound bundle is held in contact with the inner peripheral surface of the housing.

대표청구항 ▼

In a blood oxygenator comprising an elongated hollow housing having an inner peripheral surface defining an elongated chamber; at least one elongated fiber assembly disposed within said chamber along an axis thereof and comprising at least one fiber bundle including a plurality of individual hollow

In a blood oxygenator comprising an elongated hollow housing having an inner peripheral surface defining an elongated chamber; at least one elongated fiber assembly disposed within said chamber along an axis thereof and comprising at least one fiber bundle including a plurality of individual hollow fibers of a microporous membrane, opposite ends of said fiber bundle being sealingly secured to the inner peripheral surface of said housing by a potting material; gas inlet and outlet means connected respectively to opposite ends of said housing and communicating respectively with opposite ends of said hollow fibers so that an oxygenating gas can flow from said gas inlet means to said gas outlet means through the interiors of said hollow fibers; and blood inlet and outlet means formed on said housing at axially spaced-apart locations and communicating with said chamber intermediate the opposite ends of said hollow fibers so that blood can flow from said blood inlet means to said blood outlet means axially through said chamber; the improvement wherein each hollow fiber is composed of a microporous membrane which is only gas-permeable, the fiber assembly comprises at least two layers arranged one upon another, each layer comprising at least one spirally-wound fiber bundle having an ellipsoidal cross section, the direction of spiral winding of the fiber bundles in adjacent layers being such that they criss-cross each other, the size of the fibers being such that first hollow spaces are formed along the fibers between adjacent fibers composing the bundle, the size of the bundles being such that second hollow spaces are formed along the fiber bundles between adjacent windings of the fiber bundles and third hollow spaces are formed along the outermost fiber bundle between said outermost bundle and said inner peripheral surface of said elongated hollow housing, the outermost bundle making sealing contact with the inner peripheral surface so as to prevent direct flow of blood along said inner peripheral surface, the second and the third hollow spaces enabling the blood supplied to said elongated chamber to flow therethrough and to be delivered to each of the first hollow spaces formed between the fibers.