Metformin Hydrochloride Osmotic Pump Tablet Cross-Section Reduction

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Solution Overview

Problem

Metformin hydrochloride controlled-release preparations have a large cross-sectional area, making them inconvenient for patients to swallow, particularly for higher dosage forms like 1000 mg, which limits their therapeutic application due to swallowing difficulties.

Innovation Solution

A metformin hydrochloride osmotic pump tablet is prepared using a special-shaped punch, such as a capsule-shaped or ellipse-shaped punch, with a controlled-release coating film, reducing the tablet's cross-sectional area by more than 40% and achieving a weight of approximately 1.2 g for a 1000 mg specification, enhancing swallowability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a framework controlled-release mechanism is used to achieve sustained-release effect, then drug release control is improved, but the weight and volume of the tablet increase making it difficult to swallow

Engineering Contradiction:

Improvedrug release controlVSAvoidtablet weight

Core Design Contradiction:

ReliabilityVSWeight of moving object

Solution Approach 1:

The patent uses a coating film as the controlled-release means instead of a framework structure. The coating film is a thin flexible layer that controls drug release through osmotic pressure, achieving the sustained-release effect with minimal additional weight. This resolves the contradiction by providing reliable drug release control without significantly increasing tablet weight.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The patent changes the release mechanism from framework-based to coating-film-based osmotic pump technology. By changing the physical and chemical parameters of the release system (from solid framework to liquid-filled coating membrane), the tablet achieves controlled release with much lower weight and volume.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If a circular-shaped punch is used to press the tablet core, then the coating film integrity is improved, but the cross-sectional area remains large making it inconvenient to swallow

Engineering Contradiction:

Improvecoating film integrityVSAvoidcross-sectional area

Core Design Contradiction:

ReliabilityVSArea of moving object

Solution Approach 1:

The patent uses a special-shaped (non-circular) punch to press the tablet core into an asymmetric shape. This asymmetric shape has a smaller cross-sectional area that is easier to swallow while the coating process ensures uniform coating distribution. The asymmetric shape reduces the maximum cross-sectional dimension without compromising coating integrity through proper process control.

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The patent changes the tablet shape from a traditional circular planar form to a special-shaped form with optimized dimensions. By altering the geometric dimensions (using a special-shaped punch), the tablet achieves a smaller cross-sectional area for easier swallowing while maintaining sufficient coating film integrity through the coating process.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Ease of operation

If the tablet weight is reduced to improve swallowability, then ease of swallowing is improved, but the drug dosage capacity may be compromised

Engineering Contradiction:

Improveease of swallowingVSAvoiddrug dosage capacity

Core Design Contradiction:

Ease of operationVSQuantity of substance

Solution Approach 1:

The patent replaces the mechanical framework structure with an osmotic pump mechanism based on osmotic pressure. This substitution allows the tablet to achieve controlled release of high drug dosage (1000 mg metformin hydrochloride) through a lightweight coating film structure, maintaining both low weight for easy swallowing and high drug dosage capacity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent uses osmotic pressure (a hydraulic principle) as the driving force for drug release. The osmotic pump mechanism utilizes the osmotic pressure difference between the internal solution and external environment to drive controlled drug release, enabling high dosage capacity in a lightweight tablet form that is easy to swallow.

Inventive Principle:

Principle #29Pneumatics and hydraulics

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 method allows for a significant reduction in the cross-sectional area of the metformin hydrochloride osmotic pump tablet, improving patient compliance by making higher dosage forms easier to swallow while maintaining effective drug release characteristics.

Implementation Method 1

metformin hydrochloride osmotic pump tablet

Methodology Applied

Scientific EffectOsmotic pressure: Osmotic Pressure

Data Source

PatentUS10668021B2Metformin hydrochloride osmotic pump tablet and preparation method therefor

Publication Date: 2020.06.02 SALUS PHARMA TECH SHANGHAI

AI summary

Provided are a metformin hydrochloride osmotic pump tablet and a preparation method therefor. According to the preparation method, a hetero-type stamping-prepared metformin hydrochloride tablet core is used, and a controlled-release coating is wrapped outside the stamped metformin hydrochloride tablet core, such that the metformin hydrochloride osmotic pump tablet is prepared.