pH-Sensitive Polymer Coating for Medical Device Biofilm Removal
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Solution Overview
Problem
Medical devices such as catheters and stents face complications due to device-related infections, primarily caused by bacterial adherence and encrustation, which existing solutions like antibiotic coatings and surface modifications fail to adequately address, particularly in urinary catheterization, as they do not effectively remove existing biofilms or encrustation.
Innovation Solution
A medical device with a pH-sensitive degradable layer made of a linear polymer that increases water solubility and dissolves at specific pH triggers, allowing for controlled erosion and release of functional excipients, thereby self-cleansing the surface by removing bacterial colonization and encrustation, and maintaining a bacteria-free and encrustation-free surface for extended implantation periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antibiotic coatings are applied to medical devices to prevent infection, then bacterial adherence is reduced temporarily, but existing biofilms and encrustation cannot be removed and devices require frequent replacement
Solution Approach 1:
The coating transitions from a static structure to a dynamic system that responds to pH changes. When bacteria colonize the device and produce urease, the local pH increases, triggering the coating to dissolve and actively remove the biofilm, thus adapting the coating's behavior to the infection state.
Solution Approach 2:
The coating's solubility parameter is made pH-dependent through the inclusion of pH-sensitive polymers. The coating remains stable at neutral pH but dissolves at elevated pH levels caused by bacterial urease activity, enabling controlled release and biofilm removal based on environmental parameter changes.
2Object-affected harmful factors
If device surfaces are modified to reduce infection susceptibility, then initial bacterial adherence is prevented, but existing encrustation and biofilms remain and cause blockage
Solution Approach 1:
The harmful effect of bacterial urease production, which raises local pH, is converted into a beneficial trigger for coating dissolution. The pH increase that indicates infection also activates the coating's self-cleaning mechanism, turning the bacteria's metabolic byproduct into a signal for therapeutic action.
Solution Approach 2:
The coating system performs self-diagnosis and self-treatment. It autonomously detects infection through pH sensing and automatically responds by dissolving to remove biofilm and encrustation, without requiring external intervention or additional components.
3Use of energy by moving object
If cross-linked hydrogel coatings are used to release antibiotics, then sustained release is achieved, but the coatings remain water-insoluble and cannot penetrate or remove existing biofilms
Solution Approach 1:
The coating's solubility is made dynamic and responsive to environmental conditions. It transitions from an insoluble state during normal operation to a soluble state when pH-triggered dissolution occurs, enabling the coating to actively detach and remove encrustation rather than remaining as a persistent insoluble layer.
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 pH-sensitive degradable layer effectively reduces the risk of infection and encrustation by self-cleansing the device surface, allowing for longer device implantation times and minimizing the need for frequent replacements, while maintaining high drug concentrations at the infection site, thus enhancing patient safety and device efficacy.
Implementation Method 1
A medical device with a pH-sensitive degradable layer made of a linear polymer that increases water solubility and dissolves at specific pH triggers
Implementation Method 2
allowing for controlled erosion and release of functional excipients
Implementation Method 3
thereby self-cleansing the surface by removing bacterial colonization and encrustation
Data Source
Figure 1~2
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AI summary
There is provided a device comprising a body structure having one or more surfaces wherein at least one of the surfaces comprises a pH sensitive layer comprising a linear polymer, wherein the water solubility of the linear polymer increases from a first water solubility to a second water solubility at a pH trigger. A method of forming a device, and a method of preventing or mitigating infection is also described.