Self-Contained TFF Cassette Assembly Without External Clamping
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Solution Overview
Problem
Current tangential flow filtration cassettes require assembly with stainless-steel holders and clamping, which is cumbersome and costly, and alternative self-contained technologies do not match the performance of conventional single-use cassettes.
Innovation Solution
A self-contained tangential flow filtration cassette design with aligned membrane, feed, and permeate spacers, sealed with encapsulating sealant, allowing for a preassembled unit with integrated inlet and outlet ports, eliminating the need for additional assembly and clamping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional TFF cassettes use external stainless-steel holders and clamping forces, then structural strength and reliability are improved, but device complexity and ease of manufacture worsen
Solution Approach 1:
The patent merges the membrane support structure, sealing system, and flow distribution manifold into a single integrated molded plastic cassette body. The manifold features integrated flow paths for feed, retentate, and permeate streams, eliminating the need for separate stainless-steel holders and external clamping mechanisms while maintaining structural reliability through the unified molded design.
Solution Approach 2:
The patent replaces rigid stainless-steel holders with a molded plastic cassette structure that uses flexible sealing elements and thin-film membranes. The plastic construction provides sufficient structural strength while allowing for integrated sealing features that eliminate complex external clamping systems.
2Adaptability or versatility
If conventional TFF cassettes use multiple separate components requiring assembly, then adaptability is improved, but ease of operation and loss of time worsen
Solution Approach 1:
The patent implements pre-assembled modular cassettes where membranes, spacers, and flow paths are pre-integrated during manufacturing. The molded plastic cassette arrives ready-to-use with all sealing and flow distribution features built-in, eliminating on-site assembly steps and reducing setup time while maintaining adaptability through available membrane options.
Solution Approach 2:
The patent segments the filtration system into interchangeable modular cassettes that can be quickly swapped. Each module is self-contained with integrated components, allowing rapid replacement without complex disassembly while maintaining system versatility through different membrane configurations.
3Strength
If conventional TFF cassettes use external holders and clamping mechanisms, then structural strength is improved, but cost and device complexity worsen
Solution Approach 1:
The patent replaces expensive stainless-steel holders with molded plastic construction that provides adequate structural strength for filtration applications. The plastic material allows for integrated sealing features and flow paths that would be costly to manufacture separately, reducing overall system cost while maintaining necessary strength.
Solution Approach 2:
The patent combines multiple separate components (holders, seals, flow distributors) into a single molded plastic cassette body, eliminating the need for expensive stainless-steel materials and reducing manufacturing steps. The integrated design reduces material costs and assembly complexity while maintaining structural integrity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a preassembled cassette with comparable performance to conventional cassettes, reducing setup time and minimizing contamination risk while simplifying integration into fluid processes.
Implementation Method 1
Tangential-flow filtration (TFF), also known as cross-flow filtration (CFF)
Implementation Method 2
a sealant around a perimeter of the feed spacer to create a fluid-tight barrier
Data Source
AI summary
A self-contained filtration assembly with a self-contained filtration cassette therein. The cassette may be formed from one or more layers membranes and spacers (spacers, screens, or combinations thereof) all having the same general shape. The cassette may have a feed inlet path and a retentate outlet path extending through the layers of the cassette within the perimeter of the cassette, and a permeate outlet path between the cassette exterior and the interior of the cassette housing. The housing may have a generally circular or elliptical cross-section. A clamping assembly may hold together the components of the housing, and may be elongated in a direction along the flow path of the feedstream through the cassette. Various port-defining zones defined in the layers of the cassette may be sealed in a manner facilitating assembly of the cassette as well as isolation of the flow paths therein.