Protruding Filter Assembly for Chromatography Column Bed Density Control

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Solution Overview

Problem

Conventional chromatography columns experience sorbent bed compression leading to voids or dead volume, which negatively impacts column efficiency and stability, and existing solutions with movable devices are complex, expensive, and inconvenient.

Innovation Solution

A chromatography column design featuring protruding filter assemblies that compress the sorbent bed to maintain a fixed volume, reducing voids and enhancing bed density, stability, and predictability, while being cost-effective and portable.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If conventional fixed length column designs are used, then the column structure is simple, but the sorbent bed density is insufficient and voids form over time

Engineering Contradiction:

Improvesorbent bed densityVSAvoidcolumn structure

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The filter assembly is designed with a protruding portion that dynamically compresses the sorbent bed as fluid flows through the column, allowing the compression force to adapt to operational conditions rather than being fixed during manufacturing

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The protruding portion of the filter assembly changes the physical parameters of the sorbent bed by applying continuous compression force, thereby increasing bed density and reducing void volume without requiring a completely different column architecture

Inventive Principle:

Principle #35Parameter changes

2Reliability

If movable devices are added to adjust internal volume, then void volume is minimized, but the design becomes complex and expensive

Engineering Contradiction:

Improvecolumn performance stabilityVSAvoidmovable device components

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The filter assembly combines multiple functions into a single component: it serves as both the filtration element and the compression mechanism, eliminating the need for separate movable devices while maintaining column performance stability

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The protruding filter assembly automatically compresses the sorbent bed in response to fluid flow without requiring external control mechanisms, making the column self-regulating and eliminating complex actuation systems

Inventive Principle:

Principle #25Self-service

3Manufacturing precision

If movable devices are used to adjust internal volume, then void volume is reduced, but the column size increases and portability decreases

Engineering Contradiction:

Improvevoid volume controlVSAvoidcolumn tube size

Core Design Contradiction:

Manufacturing precisionVSVolume of moving object

Solution Approach 1:

The filter assembly dynamically adjusts sorbent bed compression through fluid flow rather than requiring a larger fixed internal volume, allowing precise void volume control within a compact column structure

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The protruding portion of the filter assembly applies compression locally at the sorbent bed interface rather than requiring uniform expansion of the entire column volume, maintaining compact overall dimensions while achieving precise void control

Inventive Principle:

Principle #3Local quality

4Manufacturing precision

If movable devices are incorporated, then bed density is maintained, but production cost increases

Engineering Contradiction:

Improvesorbent bed density controlVSAvoidproduction cost

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The filter assembly merges filtration and compression functions into one component, reducing the total number of parts and simplifying manufacturing processes compared to systems with separate movable density-control devices

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The filter assembly is designed as a simple, replaceable component that can be manufactured cost-effectively, potentially using standard filtration materials modified with a protruding structure, rather than expensive precision movable mechanisms

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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 design achieves higher sorbent bed density and stability, reducing voids and improving chromatographic performance, with predictable analyte retention times and simplified method scaling across different column sizes.

Implementation Method 1

The first filter assembly and the second filter assembly each have a protruding portion that protrudes into the interior chamber a predetermined amount, thereby compressing a predetermined amount of the sorbent material

Methodology Applied

Scientific EffectCompression: Compression

Implementation Method 2

The inlet filter assembly has a porous inlet filter

Methodology Applied

Scientific EffectPorosity: Porosity

Data Source

PatentUS8628667B2Chromatographic column and methods for controlling sorbent density

Publication Date: 2014.01.14 WATERS TECHNOLOGY CORP

AI summary

Disclosed herein are apparatus and methods for mitigating column bed compression over time. This invention provides for an improved column design and method of controlling bed density in a chromatographic column using a protruding portion of a filter assembly. The invention results in a higher sorbent bed density than can normally be achieved using a fixed length column of conventional design. The invention may be implemented as a unique filter assembly or as a column tailored for the application and a matching filter assembly.