Tangential Flow Filter for CSF Filtration with Parallel Segmentation
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Solution Overview
Problem
Current filters for biologic fluids, such as dead-end and depth filters, are inadequate for larger volumes and tend to clog quickly, and can cause lysis of biologic materials like blood, necessitating an improved filtration system for cerebrospinal fluid (CSF) that maintains efficient fluid management and minimizes waste.
Innovation Solution
A tangential flow filtration system is used to separate CSF into permeate and retentate, with additional filtration steps and a combiner to manage waste rate, incorporating check-valves and multiple filters in parallel to prevent backflow and clogging, allowing for efficient recycling of filtered fluid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If dead-end filters are used for filtering biologic fluids, then the filtration process is simple and easy to operate, but the filter clogs quickly and cannot handle larger volumes
Solution Approach 1:
The filtration system is divided into multiple filters arranged in parallel, where each filter handles a portion of the total flow. This segmentation allows the system to maintain high productivity while keeping individual filters simple and easy to operate, resolving the contradiction between ease of operation and filtration capacity.
2Ease of manufacture
If dead-end filters are used to remove materials from biologic fluids, then the filtration mechanism is straightforward, but the material deposits on the filter surface causing quick clogging
Solution Approach 1:
Multiple filters are arranged in parallel to segment the filtration load, preventing any single filter from becoming overloaded and clogging quickly. This maintains the simplicity of the filtration mechanism while improving filter longevity through distributed loading.
Solution Approach 2:
The system includes a bypass mechanism that allows fluid to be redirected away from filters that are becoming clogged, extending their operational life. Used filters can be easily replaced while the system continues operating with remaining filters, improving overall reliability.
3Ease of operation
If traditional filters are used for biologic materials like blood, then the filtration process is simple, but the material is lysed during filtration
Solution Approach 1:
The use of multiple parallel filters reduces the pressure differential across each individual filter, preventing the high shear forces that cause lysis of biologic materials. This maintains filtration simplicity while eliminating the harmful lysis effect.
4Device complexity
If a single filter is used for CSF filtration, then the system is simple, but waste rate increases and fluid balance is compromised
Solution Approach 1:
Multiple filters in parallel allow for more efficient filtration with lower individual flow rates, reducing the waste rate while maintaining system simplicity through modular design. The distributed loading prevents overwhelming any single filter.
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 system effectively filters biologic fluids while minimizing waste and preventing clogging, maintaining fluid balance and reducing the risk of overdrainage, thereby improving the efficiency and safety of CSF filtration.
Implementation Method 1
filtering the volume of fluid into permeate and retentate using a first filter of the filtration system, wherein the first filter comprises a tangential flow filter
Implementation Method 2
the combiner includes a check-valve configured to resist back flow into the second filter
Data Source
AI summary
Systems and methods for filtering materials from biologic fluids are discussed. Embodiments may be used to filter cerebrospinal fluid (CSF) from a human or animal subject. In an example, CSF is separated into a permeate and retentate using a tangential flow filter. The retentate is filtered again and then returned to the subject with the permeate. During operation of the system, various parameters may be modified, such as flow rate and waste rate.