Microtablet Manufacturing via Multi-Directional Compression
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Solution Overview
Problem
Existing methods for forming microtablets from bioactive compounds like proteins, antibodies, and peptides often result in significant loss of bioactivity due to denaturation or disruption of the compound's structure during fabrication processes such as molding, compression, milling, grinding, or encapsulation.
Innovation Solution
The development of an apparatus and method that uses movable members to direct, collect, and compress pharmaceutical powders into microtablets, maintaining the integrity of the bioactive compounds by controlling the density and structure of the compressed mass through multiple directional compressions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional fabrication processes (molding, compression, milling, grinding, or encapsulation) are used to form bioactive compounds into tablets, then the drug can be delivered in solid form, but the bioactivity of the drug is significantly lost due to denaturation or disruption of the protein structure
Solution Approach 1:
The invention changes the physical parameters of the compression process by using low compression forces and controlled density ranges (0.8-1.2 g/cm³) to avoid denaturation while still forming solid tablets. This parameter optimization allows the protein structure to remain intact during tablet formation.
Solution Approach 2:
The invention uses a dynamic compression approach where a movable member progressively compresses the powder bed in stages rather than applying static high force immediately. This dynamic process allows gradual densification that preserves bioactivity while achieving the desired solid form.
2Strength
If high compression forces are applied to increase tablet density, then the tablet structural integrity is improved, but the bioactivity of the protein drug is reduced due to structural disruption
Solution Approach 1:
The invention performs preliminary actions by first forming a green compact with low density and then progressively densifying it through controlled compression stages. This preliminary formation at low stress prevents initial denaturation, and subsequent gentle densification achieves structural integrity without excessive force.
Solution Approach 2:
The compression process is divided into periodic stages with rest intervals, allowing the protein structure to adapt to compression stress gradually. This periodic action prevents sudden structural disruption while achieving the desired tablet density and integrity.
3Reliability
If the powder is loosely packed to maintain bioactivity, then the bioactivity is preserved, but the tablet density and structural integrity are insufficient for stable delivery
Solution Approach 1:
The invention employs continuous compression action without interruption to progressively densify the powder bed. This continuous process ensures uniform density distribution throughout the tablet while maintaining bioactivity, eliminating the need for loose packing that would compromise 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
This approach allows for the formation of microtablets with minimal loss of bioactivity, achieving a high percentage of the drug's original biological activity post-manufacturing, and ensuring consistent pharmacokinetic parameters.
Implementation Method 1
a first moveable member may be moved from a first position to a second position within the cavity to compress, compact or otherwise concentrate or direct the pharmaceutical powder to form a collected mass of powder
Implementation Method 2
The compressing or compacting by second movable member can optionally serve to further increase the density of the pharmaceutical powder, i.e. to have a second density greater than the first density. The second direction movement of second movable member can optionally be orthogonal to the first direction movement of first movable member
Implementation Method 3
The third movable member may further include a reciprocating member articulating in a third direction such that with each successive reciprocation of movable member, the density of the powder incrementally increases to generate a compacted solid mass at a final density and shape
Data Source
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AI summary
Embodiments provide methods and apparatus for manufacturing a microtablet from a precursor material such as a pharmaceutical powder. Various embodiments provide a method which includes compressing the powder to form a compressed mass of a selected density and repeatedly compacting the compressed mass to increase the density of the compressed mass and form a microtablet. Related methods and apparatus are provided.