Tamperproof Capsule Shells with Localized Adhesive Bonding
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Solution Overview
Problem
Existing tamperproof dosage forms face challenges in providing true tamper resistance, especially under torsion forces, and often suffer from limitations in application, cost, and contamination issues.
Innovation Solution
A tamperproof dosage form is developed, featuring caplets with first and second shells fitted over at least a portion of the caplet, secured by an adhesive substance applied between the caplet and the shells. The adhesive is strategically placed over a portion of the top and bottom faces and the land of the caplet, providing enhanced resistance to torsion and pull-apart forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If shrink-wrapping shells over tablets is used, then some tamper resistance is provided, but the dosage forms are vulnerable to tampering under torsion forces
Solution Approach 1:
The adhesive substance is applied in advance to specific locations on the tablet (apexes and land) before the shells are fitted. This preliminary application ensures that when shells are subjected to torsion forces, the adhesive is already in position to resist separation, preventing the shells from twisting off easily.
Solution Approach 2:
Instead of uniformly securing the shells over the entire tablet surface, the adhesive is strategically placed at specific critical locations (apexes and land). This localized approach provides maximum resistance to torsion forces at the points where shells are most likely to be pried or twisted apart, while simplifying the overall structure.
2Reliability
If gelatinous coating is applied to tablets, then tamperproofness is provided, but the process is costly and may cause contamination
Solution Approach 1:
The invention extracts the essential tamper-resistant function from the complex gelatinous coating process and implements it through a simpler adhesive application method. By using a separate adhesive substance applied only at critical points rather than a complete gelatinous coating, the manufacturing process becomes less costly and less prone to contamination while maintaining tamperproofness.
Solution Approach 2:
The adhesive substance serves as a simple, inexpensive alternative to expensive gelatinous coatings. The adhesive provides the necessary tamper-resistant function without requiring the complex formulation and application processes of gelatinous materials, thereby reducing manufacturing costs and eliminating associated contamination risks.
3Device complexity
If adhesive is applied only at apexes with unknown separation properties, then shell connection is achieved, but separation properties under tampering forces are unpredictable
Solution Approach 1:
The adhesive is applied at two distinct locations with different functional requirements: at the apexes for basic shell connection, and on the land for enhanced resistance to torsion and pull-apart forces. This differentiated local application ensures predictable separation properties under various tampering conditions.
Solution Approach 2:
The adhesive is applied in advance to both apexes and land before shell assembly. This preliminary action ensures that when tampering forces are applied, the adhesive is already bonded and ready to resist separation, making the separation properties predictable and reliable rather than uncertain.
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 dosage form achieves significant resistance to tampering, with opening forces exceeding 15N and torsion forces greater than 100Nmm, ensuring true tamperproofness while minimizing shell deformation and material costs.
Implementation Method 1
an adhesive substance is arranged between said caplet and said shells at least over a portion of said top and/or bottom faces proximal to said first and second ends and a corresponding portion of an inner surface of the closed dome-shaped end of said shells to fixedly join said shells to said caplet
Data Source
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AI summary
A tamperproof dosage form for oral administration comprising: a caplet comprising first and second ends, a middle region extending between said first and second ends, parallel and oppositely disposed top and bottom faces, and a land interposed between the top and bottom faces and extending along a perimeter of the caplet on a plane parallel to a caplet length axis; and first and second shells, each comprising an open end and a closed dome-shaped end, each fitted over at least a portion of the caplet, the portion comprising at least the first and/or second ends of the caplet and at least part of the middle region. An adhesive substance being arranged between the caplet and the shells at least over a portion of the top and/or bottom faces proximal to the first and second ends of the caplet and a corresponding portion of an inner surface of the closed dome-shaped end of the shells to fixedly join the shells to the caplet.