Dry Compression Packing Assembly for Chromatography Media

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Solution Overview

Problem

Current methods for packing chromatography media, such as slurry packing, face challenges including inefficient and unstable column packing, radial segregation of particles, and difficulty in using nanoparticles like hydroxyapatite, which are crucial for high-resolution separations but require high pressures and are difficult to pack directly into conventional columns.

Innovation Solution

A packing assembly and method using dry compression to pack chromatography media, where a packing assembly with a bottom plate, middle plate, and top plates with a protrusion is used to compress the media into a packed-bed, allowing for efficient and reproducible packing of nanoparticles and microparticles without the need for solvents, reducing pressure requirements and operator skill dependency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If slurry packing methods are used to pack chromatography columns, then the particles can be packed into the column, but the packing becomes inefficient and unstable, and radial segregation of particles occurs

Engineering Contradiction:

Improvepacking uniformityVSAvoidpacking efficiency

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The patent replaces the traditional slurry packing method (which uses fluid dynamics and gravity) with a dry mechanical compression system. The packing assembly applies direct mechanical force through a plunger to compress dry particles into the column, eliminating the need for packing solvents and high-pressure pumping systems. This mechanical substitution achieves more uniform packing without radial segregation while maintaining packing efficiency.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention extracts and removes the packing solvent from the traditional slurry packing process. By using dry particle packing with mechanical compression, the patent eliminates the complex liquid phase system entirely, leaving only the solid particles and mechanical compression elements. This extraction simplifies the system and avoids the problems of solvent compatibility, particle settling, and radial segregation.

Inventive Principle:

Principle #2Taking out (Extraction)

2Measurement precision

If ultrafine particles smaller than 2 μm are used for high-resolution separations, then separation resolution improves, but packing becomes extremely difficult and requires ultra-high pressure systems

Engineering Contradiction:

Improveseparation resolutionVSAvoidpacking difficulty

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

The patent replaces the ultra-high pressure liquid delivery system required for packing sub-2 μm particles with a direct mechanical compression system. The packing assembly uses a plunger that applies controlled mechanical force to compress the ultrafine particles directly into the column without requiring them to be suspended in high-pressure slurry. This makes packing ultrafine particles feasible without needing expensive ultra-high pressure chromatography systems.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The packing assembly acts as an intermediary device between the dry ultrafine particles and the column. It provides a controlled environment for particle compression, using the plunger as a mediator to transfer mechanical force uniformly across the particle bed. This intermediary system enables the packing of ultrafine particles that would otherwise be impossible to pack using conventional methods.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of manufacture

If dynamic axial compression packing is used to pack soft chromatographic media, then the media can be packed, but significant differences in packing density along the bed-height and porosity in the radial direction occur

Engineering Contradiction:

Improvepacking feasibilityVSAvoidpacking homogeneity

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The packing assembly segments the compression process into controlled stages through its structured design. The plunger applies compression force in a controlled manner, and the system can be disassembled and reassembled to achieve uniform packing. This segmentation of the packing process prevents the density gradients and porosity variations that occur in dynamic axial compression methods.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of allowing particles to settle and pack under gravity and fluid flow (conventional approach), the patent inverts the approach by applying compression force from the top down using the plunger. This reverse compression method ensures uniform density throughout the bed-height and eliminates radial porosity variations by applying force uniformly across the entire particle bed surface.

Inventive Principle:

Principle #13The other way round (Inversion)

4Reliability

If retaining frits are used at the column outlet for slurry packing, then particles are retained in the column, but the frits become blocked during high pressure packing

Engineering Contradiction:

Improveparticle retentionVSAvoidpacking operation

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent extracts and removes the retaining frit from the packing system. By using dry particle packing with mechanical compression, the system does not require a frit at the column outlet to retain particles during packing, as the particles are compressed into place without requiring high-pressure slurry flow. This eliminates the frit blockage problem entirely while maintaining particle retention through the compressed packed bed structure.

Inventive Principle:

Principle #2Taking out (Extraction)

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

This approach enables fast, high-resolution separations at low pressures, improves packing efficiency, and reduces the complexity of handling nanoparticles, making it suitable for both analytical and preparative chromatography, particularly for hydroxyapatite-based separations.

Implementation Method 1

Methodology Applied

Scientific EffectMechanical compression: Compression

Data Source

PatentUS20240060940A1Packing assembly for chromatography media and methods of use thereof

Publication Date: 2024.02.22 MCMASTER UNIV

AI summary

A packing assembly for forming a packed-bed for a chromatography device is described herein. The packing assembly includes a bottom plate and a first top plate. The first top plate has a top plate hole centrally positioned therein. The packing assembly also includes a middle plate. The middle plate has a middle plate hole centrally positioned therein. The middle plate hole is aligned with the top plate hole when the packing assembly is in an assembled state. The packing assembly also includes a second top plate. The second top plate has a protrusion extending outwardly. At least a portion of the protrusion has a same size and a same shape as the top plate hole to be received in the top plate hole when the packing assembly is in a packing state. Methods of packing chromatography media in a packing assembly and assembling a chromatography device are also described herein.