Polymeric Surfaces Resistant to Bacterial Adhesion
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Solution Overview
Problem
Medical devices implanted for extended periods often suffer from microbial colonization and biofilm formation, leading to encrustation, occlusion, and infection due to the difficulty of antimicrobial agents in penetrating biofilms and inhibiting microbial proliferation on their surfaces.
Innovation Solution
A composition comprising a base polymer admixed with specific compounds (formulas I-XXI) is used to form polymeric surfaces that reduce bacterial adhesion by at least 50% under various conditions, including flow, static aqueous, ambient air, blood, and urine exposure, thereby inhibiting biofilm formation and bacterial growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antimicrobial agents are used to prevent bacterial colonization, then bacterial growth is inhibited, but the agents have difficulty penetrating biofilms and failing to kill or inhibit microorganisms within the biofilm
Solution Approach 1:
The patent incorporates antimicrobial agents directly into the polymeric surface during manufacturing, creating a pre-loaded surface that releases the agent over time. This preliminary action ensures the antimicrobial is present before biofilm formation occurs and continues to be effective throughout the device's operational life, overcoming the penetration problem by preventing biofilm establishment in the first place
Solution Approach 2:
The polymeric surface acts as an intermediary carrier that holds and gradually releases antimicrobial agents. This mediator function allows the antimicrobial to be delivered in a controlled manner directly at the interface where bacteria would attach, bypassing the need to penetrate established biofilms by preventing their formation through continuous low-level exposure
2Duration of action of moving object
If medical devices remain implanted for extended periods, then long-term monitoring or treatment is achieved, but microbial colonization and biofilm formation increase, leading to encrustation, occlusion, and device failure
Solution Approach 1:
The antimicrobial agent is pre-incorporated into the polymeric surface material, providing immediate protection upon implantation. This preliminary protective action maintains device reliability throughout the extended implantation period by continuously preventing bacterial adhesion and biofilm formation, thereby preventing encrustation and occlusion that would otherwise lead to device failure
Solution Approach 2:
The polymeric surface with incorporated antimicrobial provides continuous protection throughout the entire implantation duration. The antimicrobial agent is released or remains active continuously, ensuring uninterrupted prevention of microbial colonization, which maintains device functionality over the extended period required for long-term monitoring or treatment
3Object-affected harmful factors
If polymeric surfaces are used for medical devices, then biocompatibility is achieved, but bacterial adhesion occurs, leading to biofilm formation and device failure
Solution Approach 1:
The patent creates a composite polymeric surface that combines the base biocompatible polymer with incorporated antimicrobial agents. This composite structure maintains the biocompatibility of the polymeric surface while adding the antimicrobial property, thereby simultaneously achieving both biocompatibility and resistance to bacterial adhesion and biofilm formation
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 use of the described composition significantly reduces bacterial adhesion and biofilm formation on polymeric surfaces, leading to a lower risk of device failure and infection, maintaining a cleaner, unfouled state over time.
Implementation Method 1
a compound having a structure represented by any one of formulas (I)-(XXI) is used, wherein a polymeric surface including the compound is resistant to bacterial adhesion
Data Source
Figure 1A~1C
Figure 1D~1F
Figure 1G~2B
AI summary
The invention features surfaces formed from a base polymer admixed with an additive of the invention. The surfaces can be resistant to bacterial adhesion. The surfaces of the invention can be applied to: (a) any medical device or material that is implanted in or juxtaposed to a human or animal tissue or body fluid, in vivo or ex vivo, permanently or for a short period, and (b) any useful article, material or device, medical or not, which is to maintain a human or animal health-safe unfouled state of cleanliness over a period of time. In these medical and non-medical applications it is known that undesirable fouling phenomenon can take place which might harm a patient, user or consumer of the compromised device, equipment or material processed by, transported or stored in contamination prone articles, equipment or environments. Such fouling phenomena include biofilm development and bacterial colony development. Such fouling can cause irritation and swelling, allergic reactions, toxic reactions, poisoning or infections.