Triple Layer Tablet with Swellable Outer Layers

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Solution Overview

Problem

Existing oral sustained-release formulations using matrix systems with water-soluble polymers often experience an initial burst and unpredictable release rates due to Fickian diffusion, and introducing additional release-controlling layers can lead to layer separation and deviations in release profiles.

Innovation Solution

A triple layer tablet design featuring an inner immediate-release layer surrounded by two outer layers containing swellable polymers that form gelled layers upon exposure to aqueous media, controlling the release of the active ingredient and preventing initial bursts while maintaining uniform release patterns.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a matrix system with water-soluble polymers is used for sustained-release formulation, then the composition is simple and ease of manufacture is improved, but an initial burst occurs and release rate becomes unpredictable

Engineering Contradiction:

Improveease of manufactureVSAvoidrelease rate control

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The tablet is divided into three distinct layers: an inner immediate-release layer containing the active ingredient, and two outer sustained-release layers containing swellable polymers. This segmentation allows the inner layer to provide rapid initial release while the outer layers control subsequent release, eliminating the initial burst effect and ensuring predictable sustained-release profiles.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the tablet have different functional properties. The inner layer is designed for immediate release with high drug concentration, while the outer layers contain swellable polymers that form gel barriers to control diffusion. This local differentiation of release characteristics allows simultaneous achievement of simple manufacturing and reliable release rate control.

Inventive Principle:

Principle #3Local quality

2Reliability

If an additional release-controlling layer is introduced into the matrix formulation, then initial burst is avoided and delayed release is achieved, but layer separation occurs and release rate deviation increases

Engineering Contradiction:

Improverelease rate controlVSAvoidlayer stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The inner immediate-release layer is nested within the two outer sustained-release layers, creating a stable sandwich structure. The swellable polymers in the outer layers form gel barriers that envelop the inner layer, preventing layer separation while maintaining distinct functional zones. This nested configuration ensures both reliable release control and compositional stability.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The tablet combines different polymer systems with complementary properties: the inner layer uses water-soluble polymers for immediate release, while the outer layers use swellable polymers (such as hydroxypropylmethylcellulose or carbomer) that form gel barriers. This composite material approach prevents layer separation and ensures consistent release profiles by leveraging the synergistic effects of different polymer systems.

Inventive Principle:

Principle #40Composite materials

3Ease of manufacture

If the inner immediate-release layer is not completely coated with controlling layers, then manufacturing simplicity is maintained, but excessive initial burst and layer separation occur

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidinitial burst

Core Design Contradiction:

Ease of manufactureVSObject-generated harmful factors

Solution Approach 1:

Instead of completely coating the inner layer, the invention uses two outer layers that partially cover the inner immediate-release layer, exposing only the top and bottom surfaces. This partial coverage is sufficient to prevent lateral diffusion and initial burst while maintaining manufacturing simplicity. The swellable polymers in the outer layers form gel barriers that control drug release without requiring complete encapsulation.

Inventive Principle:

Principle #16Partial or excessive action

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 triple layer tablet effectively reduces initial bursts and ensures reproducible, sustained release of the active ingredient over a longer period, preventing layer separation and maintaining consistent release profiles.

Implementation Method 1

two outer layers containing swellable polymers. On exposure to aqueous media, the two outer layers swell to form gelled layers

Methodology Applied

Scientific EffectSwelling: Absorption (physical)

Implementation Method 2

the release of pharmaceutically active ingredient is controlled by the same mechanism as in the matrix formulation

Methodology Applied

Scientific EffectDiffusion: Diffusion

Data Source

PatentUS10646447B2Oral sustained-release triple layer tablet

Publication Date: 2020.05.12 GL PHARMTECH CO LTD

AI summary

The present invention relates to an oral sustained-release triple layer tablet, more particularly, a triple layer tablet consisting of an inner immediate-release layer containing a pharmaceutically active ingredient and two outer layers containing swellable polymers. Upon exposure to aqueous media, the two outer layers swell to form gelled layers surrounding the lateral side of the inner layer rapidly, thereby control effectively the release of the pharmaceutically active ingredient from the inner immediate-release layer.