Porous polypropylene membrane and method for production thereof
First Claim
1. A porous polypropylene hollow fiber membrane constructed and arranged for artificial lung use having an oxygen gas flux in the range of 100 to 1,500 liters/mm.m2.atom comprising a solid phase in an inner surface region thereof formed with particles of polypropylene closely fused and joined to give rise to a continuous phase while partially exposed through the surface thereof, a solid phase in an interior and an outer surface region thereof formed with particles of polypropylene interconnected in the direction of axis of fiber to give rise to a multiplicity of lumps of polypropylene, and an interstice between said solid phases having continuous pores interconnected in the form of a three-dimensional network, wherein pores on the outer surface of said membrane consist essentially of pores having a pore diameter of 1 μ
- m or less.
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Abstract
A porous polypropylene hollow fiber membrane constructed and arranged for artificial lung use and an artificial lung. The membrane includes a solid phase in an inner surface region thereof formed with particles of polypropylene closely fused and joined to give rise to a continuous phase while partially exposed through the surface thereof, a solid phase in an interior and an outer surface region thereof formed with particles of polypropylene interconnected in the direction of axis of the fiber to give rise to a multiplicity of lumps of polyproplylene and an interstice between the phases having continuous pores interconnected in the form of a three-dimensional network.
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Citations
16 Claims
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1. A porous polypropylene hollow fiber membrane constructed and arranged for artificial lung use having an oxygen gas flux in the range of 100 to 1,500 liters/mm.m2.atom comprising a solid phase in an inner surface region thereof formed with particles of polypropylene closely fused and joined to give rise to a continuous phase while partially exposed through the surface thereof, a solid phase in an interior and an outer surface region thereof formed with particles of polypropylene interconnected in the direction of axis of fiber to give rise to a multiplicity of lumps of polypropylene, and an interstice between said solid phases having continuous pores interconnected in the form of a three-dimensional network, wherein pores on the outer surface of said membrane consist essentially of pores having a pore diameter of 1 μ
- m or less.
- View Dependent Claims (2, 3, 4, 5, 6, 7)
- 8. An artificial lung provided with a hollow fiber membrane having an oxygen gas flux in the range of 100 to 1,500 liters/mm.m2.atom as a gas-exchange membrane, said membrane comprising a solid phase in an inner surface region thereof formed with particles of polypropylene closely fused and joined to give rise to a continuous phase while partially exposed through the surface thereof, a solid phase in an interior and an outer surface region thereof formed with particles of polypropylene interconnected in the direction of axis of fiber to give rise to a multiplicity of lumps of polypropylene, and an interstice between said solid phases having continuous pores interconnected in the form of a three-dimensional network, wherein pores on the outer surface of said membrane consist essentially of pores having a pore diameter of 1 μ
Specification