Knurled sheetlike permeable membrane, for production thereof, an

Details Knurled sheetlike permeable membrane, for production thereof, an Knurled sheetlike permeable membrane, for production thereof, an

1990-01-23

1992-03-10

Sever, Frank

Liquid purification or separation

Casing divided by membrane into sections having inlet

Each section having inlet

21032184, F01D 6118

Patent

active

050947494

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. [Field of the Invention]
This invention relates to a sheetlike permeable membrane, a method for the production thereof, and a body fluid filtering apparatus. More particularly, this invention relates to a sheetlike permeable membrane used for dialysis, ultrafiltration, precision filtration, etc., which sheetlike permeable membrane, when it is incorporated in a modular structure, for example, permits ready formation of a stable flow path for a liquid under treatment, a method for the production of the sheetlike permeable membrane, and a body fluid filtering apparatus using the sheetlike permeable membrane.
2. [Description of the Prior Art]
Nowadays various kinds of macromolecular permeable membranes are used in physical and chemical operations of separation such as dialysis, ultrafiltration, and precision filtration, for example. Generally, macromolecular compounds are the most suitable materials for such membranes. Macromolecular permeable membranes, however, are susceptible of deformation. When a sheetlike permeable membrane is incorporated in a modular structure, for example, the deformation renders it difficult for the permeable membrane to retain stably a prescribed flow path for a liquid under treatment.
As a solution for this problem, there has been proposed a sheetlike permeable membrane which, prior to its incorporation in a modular structure such as of a blood plasma separation apparatus, is provided on one surface thereof with a body fluid flow path regulating plate possessed of a jogging surface and which is claimed to form a body fluid flow path in a thickness of high accuracy and manifest a satisfactory ability to separate blood plasma [Japanese Patent Application Unexamined Disclosure SHO 57(1982)-25,857]. In the blood plasma separation apparatus as illustrated in FIG. 11, for example, inside a case comprising cylindrical case proper 54 provided in the central part of the top plate thereof with a body fluid inlet 51, in the peripheral part of the top plate thereof with blood plasma outlets 52, and in the lateral wall thereof with blood fluid outlet 53 and a bottom lid member 56 fitted along the peripheral edge thereof with an O ring 55, a plurality of permeable membrane units 61 each formed by interposing a filtrate flow path forming plate 57 of screen mesh between two vertically opposed sheetlike permeable membranes 50a, 50b, sealing the peripheral edges thereof and the peripheral edge part of a central open part 58, and attaching a sealing material 60 fast to the outer periphery of a filtrate passing hole 59 are superposed as separated by the intervention of a body fluid flow path regulating plate 62 provided with the central open part 58 and the filtrate passing hole 59 opposed to the permeable membrane unit 61 and further provided on the opposed surfaces thereof with a multiplicity of protuberances, and body fluid flow path regulating plates 63 each provided with the central open part 58 and the filtrate passing hole 59 opposed to the permeable membrane unit 61 and further provided on one surface thereof with a multiplicity of protuberances are severally interposed between the upper surface of the uppermost of the permeable membrane units 61 and the upper inner surface of the case and between the lower surface of the lowermost of the permeable membrane units and the bottom inner surface of the case.
In order that the conventional sheetlike permeable membranes may be allowed as described above to form a flow path for a liquid under treatment in a modular structure, for example, it is necessary that mesh plates such as the filtrate flow path forming plates 57 and dotted plates such as the body fluid flow path regulating plates 62, 63 should intervene as spacers between the permeable membranes as in the blood plasma separation apparatus illustrated in FIG. 11. When they are superposed in a multiplicity of layers, therefore, they entail a disadvantage that the modular structure occupies a large space, the assembly of the structure calls for a complicated proces

REFERENCES:
patent: 4597868 (1986-07-01), Watanabe

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