Polylactide Silver Ion Implant Coating for Controlled Release
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Solution Overview
Problem
Current anti-infective coatings for implants, including those with antibiotics and metals like silver, face challenges in controlling the concentration and duration of silver ion release, leading to short-term efficacy and potential resistance development, with existing solutions failing to maintain effective antibiotic levels and prevent infection effectively.
Innovation Solution
A coating comprising a first layer of polylactide and silver ions, with an optional second layer of antibiotic compounds, designed to release silver ions in a controlled manner, triggered by shock waves for enhanced infection prevention and treatment, ensuring sustained antibiotic concentrations and minimizing resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silver ions are released from the implant coating, then antibacterial activity is improved, but control over concentration and duration of release deteriorates
Solution Approach 1:
The patent applies parameter changes by utilizing the degradation kinetics of polylactide to control the release rate of silver ions. By changing the polymer matrix properties (degradation rate, molecular weight, crystallinity), the release profile of silver ions can be precisely tuned to maintain effective concentrations over extended periods while avoiding toxic peaks.
Solution Approach 2:
The polylactide polymer serves as an intermediary carrier between the implant and the silver ions. This mediator controls the interaction between the silver ions and the biological environment, enabling sustained release through polymer degradation while preventing direct contact and uncontrolled release of silver ions.
2Reliability
If antibiotics are applied as additive to PMMA, then anti-infective therapy is provided, but release of active ingredient deteriorates due to limited release and quick concentration drop
Solution Approach 1:
The patent employs composite materials by combining polylactide (a biodegradable polymer) with silver ions to create a new coating system. This composite structure enables controlled release through the polymer's degradation mechanism, overcoming the limitations of PMMA-based systems where antibiotics are simply mixed in and released uncontrollably.
Solution Approach 2:
The polylactide coating is designed as a temporary, biodegradable carrier that dissolves over time, releasing silver ions during its degradation process. This disposable approach eliminates the need for long-term retention of the carrier material in the body, as it naturally degrades and is metabolized.
3Reliability
If silver is introduced into the body as powder or in high concentrations, then bactericidal effect is achieved, but tissue and cell toxicity worsens
Solution Approach 1:
The patent applies local quality by creating a surface-coated implant rather than bulk silver distribution. The silver ions are concentrated in the coating layer at the implant surface where they exert bactericidal effects, while the bulk implant material remains free of silver, preventing systemic toxicity and tissue damage at a distance from the implant.
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 coating achieves controlled release of silver ions and antibiotics, providing prolonged antibacterial activity, reducing infection risk, and preventing bacterial resistance, while maintaining biocompatibility and safety.
Implementation Method 1
the coating comprises a first layer, the first layer comprising a polylactide and silver ions
Implementation Method 2
triggered by shock waves for enhanced infection prevention and treatment
Data Source
AI summary
The present invention relates to an implant having a surface comprising a coating on at least a portion of the surface of the implant, wherein the coating comprises a first layer, the first layer comprising a polylactide and silver ions. The present Invention further relates to a method of manufacturing the implant as well as to an implant obtainable by that method.