Osmotic Tablet Dissolution Control via Statistical Modeling
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Solution Overview
Problem
Existing methods for manufacturing extended release oral tablets with osmotic delivery systems face challenges in achieving uniform character and quality within specified limits, particularly for drugs with limited solubility like treprostinil.
Innovation Solution
A method involving the use of a statistical modeling approach to control tablet strength, acetyl content of cellulose acetate in the semi-permeable membrane, and weight gain of the membrane to produce a batch of extended release tablets with a desired dissolution profile.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional manufacturing processes are used for extended release tablets, then production is simpler and faster, but batch uniformity and quality specification compliance are poor
Solution Approach 1:
The patent applies preliminary action by establishing statistical models and control parameter ranges before manufacturing batches. The methodology involves pre-determining optimal ranges for membrane weight gain, acetyl content, and tablet strength through preliminary experiments and statistical analysis, then using these pre-established parameters to guide production and ensure batch uniformity without requiring complex real-time adjustments during manufacturing.
2Reliability
If statistical modeling and multiple parameter control are implemented, then batch quality and dissolution profile consistency improve, but manufacturing process complexity increases
Solution Approach 1:
The patent implements feedback by using statistical models that analyze the relationships between manufacturing parameters (membrane weight gain, acetyl content, tablet strength) and dissolution profiles. The methodology incorporates feedback loops where dissolution test results from pilot batches are fed back into the statistical model to refine parameter ranges and predictions, enabling continuous improvement of batch quality while maintaining manageable process control through data-driven decision making.
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 method ensures that the produced pharmaceutical batch meets the desired average dissolution profile, reducing the failure rate of batches that do not meet specifications compared to traditional manufacturing processes.
Implementation Method 1
These osmotic dosage forms function by allowing water from gastric or intestinal fluid, to flow through the semi-permeable membrane and dissolve the active ingredient in the core so it can be released through one or more passageways in the membrane. An elementary osmotic pump (EOP) delivery system requires that the drug is in solution in order to be delivered in a controlled and predictable manner. The drug in solution is pumped out due to the osmotic gradient generated across the semi-permeable membrane.
Implementation Method 2
If the drug is insoluble, an elementary osmotic pump system will not function properly. One approach for delivering pharmaceutical agents that are insoluble in aqueous solvents was developed by Kuczynski et al., (U.S. Pat. No. 5,545,413). In their approach, the interior of the tablet or capsule is characterized by two core layers, one containing the pharmaceutical agent (again to be released through openings, or holes, in the wall of the tablet or capsule) and the other being a layer of material that swells when coming into contact with water. The material that swells or expands to an equilibrium state when exposed to water or other biological fluids is referred to as an 'osmopolymer'. This volume expansion is used to physically force the pharmaceutical agent out through the openings, which have been formed in the wall, shell or coating during the manufacture.
Data Source
AI summary
A method of producing an oral osmotic pharmaceutical delivery system by using a statistical modeling. The method includes determining a desired average dissolution profile for the active pharmaceutical ingredient; and controlling tablet strength, acetyl content of the cellulose acetate and weight gain of the semi-permeable membrane of the tablet to produce a pharmaceutical batch of tablets having the desired dissolution profile.