Tangential Flow Filtration for CSF Clogging and Lysis Control
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Solution Overview
Problem
Existing filtration systems for biologic fluids, such as dead-end and depth filters, are limited by small surface area, prone to clogging, and can cause lysis of materials like blood, necessitating improved systems for larger volumes and efficient removal of contaminants.
Innovation Solution
A method and system utilizing tangential flow filters to separate cerebrospinal fluid (CSF) into permeate and retentate, with optional secondary filtration through dead-end or depth filters, and a combiner to return filtered materials to the subject, while maintaining a waste rate below a threshold to prevent overdrainage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If dead-end filters are used for filtration, then ease of operation is improved, but filter surface area is limited causing clogging and inability to handle larger volumes
Solution Approach 1:
The patent transitions from dead-end filtration (perpendicular flow) to tangential flow filtration (parallel flow along the membrane surface). This dimensional change in flow direction allows continuous sweeping of the membrane surface, preventing material deposition and clogging, thereby enabling handling of larger fluid volumes without increasing filter surface area
2Ease of operation
If dead-end filters are used for filtration, then ease of operation is improved, but productivity decreases due to quick clogging
Solution Approach 1:
By changing the flow direction from perpendicular (dead-end) to parallel (tangential) relative to the membrane surface, the system prevents material accumulation on the filter. This maintains continuous high-level filtration throughput without the productivity loss from frequent clogging and filter replacements
3Reliability
If dead-end filters are used for biologic material filtration, then filtration is achieved, but harmful effects occur due to material lysis
Solution Approach 1:
The tangential flow configuration creates a sweeping motion along the membrane surface that prevents material accumulation and high local pressure zones. This reduces mechanical stress on biologic materials during filtration, preventing lysis while maintaining effective separation of contaminants
4Area of stationary object
If tangential flow filters are used, then filter surface area effectiveness is improved, but device complexity increases
Solution Approach 1:
The tangential flow system uses the fluid's own flow to continuously clean the membrane surface through a sweeping action. This self-cleaning mechanism eliminates the need for complex external cleaning systems, backflush mechanisms, or multiple filter stages, thereby maintaining simplicity while maximizing filter surface area effectiveness
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 contaminants from biologic fluids, minimizing clogging and overdrainage risks, ensuring efficient and safe return of filtered materials to the subject.
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
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.