Antimicrobial Ophthalmic Implant Polymer via Bulk Integration
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Solution Overview
Problem
Current ophthalmic implant devices face significant challenges in preventing microbial infections post-surgery, as existing strategies like topical antibiotics and metal ion-infused polymers can lead to compliance issues and toxicity, respectively, with antimicrobial properties often being lost over time due to surface erosion.
Innovation Solution
Development of antimicrobial polymers obtained by copolymerizing antimicrobial monomers with acrylic, silicone, or collagen monomers, resulting in biocompatible, reversibly deformable, and clear or opaque implants that maintain antimicrobial properties throughout their lifespan, even if the surface erodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If topical antibiotic drops are used to prevent infection, then infection risk is reduced, but patient compliance becomes problematic and treatment burden increases
Solution Approach 1:
The implant device incorporates antimicrobial agents directly into its structure, enabling it to provide its own infection protection without requiring external administration by the patient. This self-service mechanism eliminates compliance issues while maintaining reliable infection prevention throughout the device's functional life
Solution Approach 2:
The antimicrobial protection is pre-integrated into the implant device during manufacturing, so that infection prevention capability is established before implantation. This preliminary action ensures protection is immediately available and persists throughout the device's service life without requiring subsequent patient actions
2Reliability
If coatings or covalently bonded antibacterial chemicals are applied to the implant surface, then initial antimicrobial protection is achieved, but the properties are lost over time due to surface erosion
Solution Approach 1:
The invention changes the fundamental parameter of antimicrobial agent placement from surface-level (coatings/bonded chemicals) to bulk-integrated throughout the polymer matrix. This parameter change ensures that even as the surface erodes over time, fresh antimicrobial agents are continuously exposed from the interior, maintaining protection throughout the device's lifespan
Solution Approach 2:
The implant device is constructed as a composite material system where the polymer matrix is uniformly distributed with antimicrobial agents throughout its volume. This composite structure ensures that antimicrobial protection is an intrinsic property of the bulk material rather than a surface coating, preventing loss of activity due to surface erosion
3Reliability
If free metal ions are infused into the polymer, then antimicrobial properties are achieved, but toxicity to ocular tissues occurs
Solution Approach 1:
The invention extracts the toxic free metal ion form and replaces it with covalently bonded or encapsulated antimicrobial agents that maintain antimicrobial activity without releasing toxic ions into the ocular environment. This extraction of the harmful form while preserving the beneficial function resolves the toxicity issue
Solution Approach 2:
The polymer matrix serves as an intermediary that delivers antimicrobial protection through non-toxic mechanisms. Instead of using free metal ions that directly contact and damage ocular tissues, the polymer-bound antimicrobial agents provide protection through controlled interaction, mediating between the need for antimicrobial activity and the requirement for tissue biocompatibility
Data Source
AI summary
An antimicrobial polymer for use in an ophthalmic implant, includes at least one antimicrobial monomer; and at least one other monomer selected from an acrylic, silicone, vinyl and collagen monomer.