Donepezil Adhesive Patch Moisture Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Adhesive preparations containing donepezil undergo discoloration over time, leading to concerns about quality and patient adherence, with existing technologies not adequately addressing the issue of time-based discoloration or providing solutions for this specific application.
Innovation Solution
A package with a moisture permeation preventing pouch housing an adhesive preparation containing donepezil, where the water content of the adhesive layer is controlled between 2000 ppm and 5000 ppm, and optionally including a desiccant, to inhibit discoloration and enhance releasability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If adhesive preparations containing donepezil are stored for long-term use, then the preparation remains available for patient administration, but the adhesive layer undergoes discoloration that reduces patient compliance
Solution Approach 1:
The patent applies parameter changes by controlling the water content of the adhesive layer within a specific range (5-20% by weight) to prevent discoloration. This involves adjusting formulation parameters such as the type and amount of plasticizer, solvent, and other excipients to achieve optimal water content that stabilizes the donepezil and prevents adhesive layer discoloration during long-term storage
Solution Approach 2:
The patent uses intermediary substances such as plasticizers (e.g., triethyl citrate, dibutyl sebacate), solvents (e.g., ethyl acetate, isopropyl alcohol), and antioxidants to mediate between the donepezil and the adhesive matrix. These intermediaries help control the microenvironment within the adhesive layer, preventing discoloration while maintaining drug stability and delivery functionality
2Reliability
If the adhesive layer contains donepezil for transcutaneous administration, then the drug can be delivered to patients, but the adhesive layer discolors over time affecting perceived quality
Solution Approach 1:
The patent maintains color consistency by controlling formulation parameters including the ratio of donepezil to adhesive polymers, the selection of color-stable plasticizers and solvents, and the water content of the adhesive layer. These parameter controls ensure that the adhesive layer maintains its intended appearance while fulfilling its drug delivery function
Solution Approach 2:
The patent employs intermediary agents such as antioxidants (e.g., vitamin E, BHT), UV absorbers, and colorants to protect the donepezil-adhesive system from degradation. These intermediaries act as buffers that prevent discoloration reactions while allowing the drug to be effectively delivered through the skin
3Stability of the object's composition
If existing technologies for inhibiting adhesive discoloration are applied, then general adhesive stability is improved, but they do not address time-based discoloration specific to donepezil preparations
Solution Approach 1:
The patent applies local quality by tailoring the adhesive formulation specifically for donepezil transcutaneous delivery. This includes selecting adhesive polymers, plasticizers, and solvents that are compatible with donepezil's chemical properties and its requirements for skin penetration. The formulation is optimized locally for this specific drug rather than using general-purpose adhesive formulations
Solution Approach 2:
The patent segments the adhesive layer into functional components with specific roles: the adhesive polymer provides bonding, the plasticizer maintains flexibility and controls water content, the solvent aids in drug dissolution, and antioxidants prevent discoloration. This segmentation allows each component to be optimized for its specific function while working together to prevent donepezil preparation discoloration
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 solution effectively stabilizes the adhesive preparation over time, maintains the quality of donepezil, and ensures superior releasability, thereby enhancing drug availability and patient compliance.
Implementation Method 1
a moisture permeation preventing pouch, wherein the adhesive preparation is housed in the moisture permeation preventing pouch and a water content of the adhesive layer is controlled to be 2000 ppm or more and 5000 ppm or less
Implementation Method 2
the adhesive preparation and a desiccant are housed in the moisture permeation preventing pouch
Data Source
AI summary
[Abstract] [Object] An adhesive preparation containing donepezil is provided in which adhesive layer discoloration over time is inhibited. [Solution] The adhesive preparation containing donepezil has an adhesive layer containing donepezil and an acrylic adhesive on at least one side of a support, and a water content of the adhesive layer is 1000 ppm or more. The water content of the adhesive layer is preferably 8000 ppm or less and more preferably 7000 ppm or less.