Tympanostomy Tube with Ciprofloxacin Solid Solution
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Solution Overview
Problem
Current drug delivery systems, particularly matrix systems, suffer from first-order release behavior with diminishing rates, leading to ineffective long-term drug release and potential cytotoxicity, inflammation, and biofilm formation on medical devices like tympanostomy tubes, which can cause recurrent infections.
Innovation Solution
A solid, non-porous composite of an ethylene-vinyl acetate copolymer with ciprofloxacin antibiotic dispersed uniformly, forming a stable solid solution phase that maintains a constant drug release rate over an extended period without erosion or disintegration, preventing biofilm formation and cytotoxicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a matrix drug delivery system is used, then the drug can be delivered at low cost and with ease of fabrication, but the release rate continuously diminishes leading to ineffective long-term drug release
Solution Approach 1:
The invention changes the physical-chemical parameters of the drug-polymer system by creating a solid solution phase rather than a simple dispersed mixture. This phase change enables zero-order release kinetics, transforming the release profile from diminishing first-order to constant zero-order release, thereby achieving effective long-term drug release while maintaining ease of fabrication through melt blending processes
2Device complexity
If a matrix drug delivery system is used, then the system is simple and easy to fabricate, but it causes cytotoxicity and inflammation due to diminishing release rates
Solution Approach 1:
The invention changes the release kinetics parameter from first-order diminishing release to zero-order constant release by forming a solid solution phase. This parameter change ensures therapeutic drug levels are maintained without fluctuation, eliminating the cytotoxicity and inflammation caused by high initial concentrations followed by sub-therapeutic levels
Solution Approach 2:
The invention creates a composite material system where the drug and polymer form a solid solution phase rather than remaining as separate dispersed phases. This composite structure at the molecular level enables controlled zero-order release while maintaining the simplicity and ease of fabrication of matrix systems
3Reliability
If conventional polymer materials are used in tympanostomy tubes, then the tubes are biocompatible, but biofilm formation occurs leading to recurrent infections
Solution Approach 1:
The invention applies preliminary action by incorporating the antibiotic drug into the polymer matrix before tube insertion. The drug is pre-loaded in the solid solution phase, providing immediate and sustained release upon implantation to prevent biofilm formation before it can occur, thereby maintaining biocompatibility while eliminating the harmful effect of biofilm
Solution Approach 2:
The invention converts the potential harm of recurrent infections from biofilm formation into a benefit by using the same polymer matrix to deliver anti-bacterial agents. The biofilm-prone environment is transformed into a protected environment where the controlled release of antibiotic from the solid solution phase prevents biofilm development
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 composite provides a prolonged, constant release of ciprofloxacin, effectively preventing biofilm formation and reducing bacterial growth, thereby minimizing recurrent infections and maintaining tissue integrity.
Implementation Method 1
The drug is released by diffusion through the polymer matrix over a prolonged period of time without erosion, dissolution or disintegration.
Implementation Method 2
The articles of the invention are solid, non-porous composites prepared by uniformly dispersing a bioactive agent in a non-biodegradable thermoplastic polymer melt
Data Source
AI summary
Methods of preventing and treating an ear infection comprising insertion of a tympanostomy tube comprised of a least one anti-biotic agent.