Flexible biofluid filter and method for manufacturing such a filter

By adjusting the orientation of the intermediate layer and the electrode design, and optimizing the current and electrode alignment, the problem of insecure sealing in the blood filter was solved, improving the filter's sealing performance and pressure resistance.

CN122295138APending Publication Date: 2026-06-26FRESENIUS HEMOCARE ITAL
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Patent Information

Application Number
CN202380104369.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-11-30
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing blood filters have the problem of difficulty in forming a strong seal when forming the inner seal, especially due to the different melting temperatures of the materials and the misalignment of the electrodes, which leads to an unstable seal.

Method used

By changing the orientation of the intermediate layer or frame to make its flat side contact the filter medium, and adjusting the current magnitude and electrode alignment according to the roughness of the intermediate layer, the shape and radius of the electrodes are optimized to form a more robust inner seal.

Benefits of technology

A more robust internal seal was achieved, improving the filter's sealing performance and pressure resistance, and reducing the occurrence of weak points in the seal.

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Abstract

A filter for removing leukocytes from biological fluids includes a flexible housing having a first sheet and a second sheet. A filter medium and an intermediate layer are at least partially positioned between the sheets of the housing, wherein an inner seal connects the first housing sheet, the filter medium, and the intermediate layer. The intermediate layer may be embossed with a textured side including multiple protrusions and a flat side including multiple planar recesses, wherein the intermediate layer is oriented such that the flat side is positioned in contact with the filter medium. The inner seal is formed by applying pressure and an electric current, wherein the magnitude of the current is based on the roughness of the intermediate layer. Opposite sides of the inner and outer ends of the inner seal may each have a radius greater than or equal to 0.5 mm.
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Citation Information

Patent Citations

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