Filter module
First Claim
1. A disposable hemodialysis filter module comprising:
- a housing; and
at least a first filter stage and a second filter stage which are substantially concentrically arranged inside said housing with the first filter stage surrounded by the second filter stage, said first filter stage and said second filter stage each including a plurality of hollow fiber membranes having a first fiber end and a second fiber end which are embedded in a respective casting compound,the first filter stage being a filter stage for a filtration of a first medical fluid and the second filter stage being a filter stage for the filtration of a second medical fluid, the first medical fluid being at least one of a dialyzing fluid and a substitution fluid, and the second medical fluid being blood,the first filter stage having unilaterally closed fiber ends, and the second filter stage having open fiber ends, anda boundary element which surrounds the first filter stage, which separates the first filter stage and the second filter stage from one another, and which has at least one opening which establishes a fluid communication between the first filter stage and the second filter stage, the boundary element being or including at least one of a film and a tube, and the opening in the boundary element being configured as one opening or as a plurality of openings arranged peripherally at the boundary element,with the hollow fiber membranes of the second filter stage having an alignment which is non-parallel to a longitudinal axis of the filter module,the first fiber ends of the first and second filter stage being embedded in a first casting compound common to the first and second stage, and the second fiber ends of the first and second filter stage being embedded in a second casting compound common to the first and second stage, with the first casting compound being separate from the second casting compound and the first and second casting compound arranged on opposite sides of the housing, and with the hollow fiber membranes of the second filter stage having a larger effective length than the hollow fiber membranes of the first filter stage due to the non-parallel alignment thereof.
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Accused Products
Abstract
A filter module includes a first filter stage and a second filter stage which are substantially concentrically arranged. The first filter stage and the second filter stage each include a plurality of hollow fiber membranes having a first fiber end and a second fiber end, which are embedded in a respective casting compound. The first filter stage is a filter stage for the filtration of a first medical fluid, and the second filter stage is a filter stage for the filtration of a second medical fluid. The first filter stage has unilaterally closed fiber ends, and is surrounded by a boundary element which separates the first filter stage and the second filter stage from one another. The boundary element has at least one opening which provides fluid communication between the first filter stage and the second filter stage.
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Citations
16 Claims
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1. A disposable hemodialysis filter module comprising:
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a housing; and at least a first filter stage and a second filter stage which are substantially concentrically arranged inside said housing with the first filter stage surrounded by the second filter stage, said first filter stage and said second filter stage each including a plurality of hollow fiber membranes having a first fiber end and a second fiber end which are embedded in a respective casting compound, the first filter stage being a filter stage for a filtration of a first medical fluid and the second filter stage being a filter stage for the filtration of a second medical fluid, the first medical fluid being at least one of a dialyzing fluid and a substitution fluid, and the second medical fluid being blood, the first filter stage having unilaterally closed fiber ends, and the second filter stage having open fiber ends, and a boundary element which surrounds the first filter stage, which separates the first filter stage and the second filter stage from one another, and which has at least one opening which establishes a fluid communication between the first filter stage and the second filter stage, the boundary element being or including at least one of a film and a tube, and the opening in the boundary element being configured as one opening or as a plurality of openings arranged peripherally at the boundary element, with the hollow fiber membranes of the second filter stage having an alignment which is non-parallel to a longitudinal axis of the filter module, the first fiber ends of the first and second filter stage being embedded in a first casting compound common to the first and second stage, and the second fiber ends of the first and second filter stage being embedded in a second casting compound common to the first and second stage, with the first casting compound being separate from the second casting compound and the first and second casting compound arranged on opposite sides of the housing, and with the hollow fiber membranes of the second filter stage having a larger effective length than the hollow fiber membranes of the first filter stage due to the non-parallel alignment thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A disposable hemodialysis filter module comprising:
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a housing; and at least a first filter stage and a second filter stage which are substantially concentrically arranged inside said housing with the first filter stage surrounded by the second filter stage, said first filter stage and said second filter stage each including a plurality of hollow fiber membranes having a first fiber end and a second fiber end which are embedded in a respective casting compound, the first filter stage being a filter stage for a filtration of a first medical fluid and the second filter stage being a filter stage for the filtration of a second medical fluid, the first medical fluid being at least one of a dialyzing fluid and a substitution fluid, and the second medical fluid being blood, the first filter stage having unilaterally closed fiber ends, and the second filter stage having open fiber ends, and a boundary element which surrounds the first filter stage, which separates the first filter stage and the second filter stage from one another, and which has at least one opening which establishes a fluid communication between the first filter stage and the second filter stage, the boundary element being or including at least one of a film and a tube, and the opening in the boundary element being configured as one opening or as a plurality of openings arranged peripherally at the boundary element, with first fiber ends of the first and second filter stage being embedded in a first casting compound common to the first and second stage, and second fiber ends of the first and second filter stage being embedded in a second casting compound common to the first and second stage, with the first casting compound being separate from the second casting compound and the first and second casting compound arranged on opposite sides of the housing, with the second casting compound having a first region arranged centrally in the casting compound and embedding the second fiber ends of the first filter stage, with the second fiber ends of the first filter stage being closed in the first region of the second casting compound to provide a unilateral closure of the first filter stage, and with the second casting compound having a second region integral with and peripherally surrounding the first region, the second region embedding the second fiber ends of the second filter stage, with the second fiber ends of the second filter stage being open in the second region of the second casting compound to provide an open end of the second filter stage.
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Specification