| 摘要 |
There is shown and described a tubular flexible filter membrane disposed within a flexible conductor such as IV tubing. This flexible filter membrane is sufficiently smaller in its outer diameter than the inner diameter of the flexible conductor so that a space is provided for the flow of fluid. This flexible filter is hydrophilic and has one end closed to exclude fluid flow to the interior of the filter. The other end of this filter membrane is secured to a tubular conductor and at this secured portion is made non-conductive as to gas and fluid flow through the filter wall. A method of attaching this filter membrane end by heating the thermoplastic filter membrane so as to cause thinning of the wall of the filter membrane and making this thinned portion non-conductive as to gas flow is shown. Potting, using polyurethane compounds, may be used but is time-consuming and costly. The flexible conductive tubing is usually produced by extruding dies and methods so ribs and/or flutes may be formed and are contemplated although not illustrated. Heating of the end of the filter membrane is shown by two modes of apparatus. When this filter design is used in conjunction with a drainage system, a vent as well as anti-reflux devices are not required in the collection bag.
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