Antimicrobial Polymer Membrane for Analyte Sensor Signal Stability
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Solution Overview
Problem
In vivo analyte sensors experience short life spans due to late signal attenuation (LSA) caused by biological processes such as immune responses, infection, inflammation, fibrosis, and vessel regression, leading to disturbances in sensing pathways that affect sensor function.
Innovation Solution
An analyte sensor with a polymer membrane containing an antimicrobial agent and/or hydrogel coating, optionally combined with a metal-containing layer, to maintain sensing pathway integrity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If an in vivo analyte sensor is implanted for long-term wear, then continuous analyte monitoring capability is achieved, but late signal attenuation occurs due to biological processes such as immune responses, fibrosis, and infection
Solution Approach 1:
The patent applies preliminary anti-action by incorporating antimicrobial agents (such as antibiotics or antimicrobial peptides) into the sensor coating before implantation. This pre-established protective layer prevents microbial colonization and biofilm formation that would otherwise cause signal attenuation and sensor failure during long-term wear, thereby maintaining signal stability throughout the extended operational period
Solution Approach 2:
The patent employs composite materials by combining multiple functional components in the sensor coating: a polymer matrix (such as polyvinylpyridine or polyvinylimidazole) integrated with antimicrobial agents and optionally metal-containing layers. This composite structure provides simultaneous benefits of structural integrity, analyte permeability, and antimicrobial protection, enabling both long-term durability and signal reliability
2Object-affected harmful factors
If microorganisms colonize the implant site, then biofilm formation occurs on the sensor surface, but this produces a diffusion barrier that artificially lowers analyte readings
Solution Approach 1:
The antimicrobial agents embedded in the sensor coating provide preliminary protection against microorganism colonization. By establishing this protective barrier before implantation, the sensor prevents biofilm formation that would create diffusion barriers and cause artificially low analyte readings, thereby maintaining measurement accuracy throughout the sensor's wear duration
Solution Approach 2:
The polymer coating acts as an intermediary layer between the sensor surface and the biological environment. This intermediate layer incorporates antimicrobial agents that actively prevent microorganism attachment and biofilm formation, thereby protecting the sensing interface from diffusion barriers while still allowing analyte transport to the sensing elements
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 sensor minimizes disturbances from microorganisms, reducing biofilm formation and maintaining sensor functionality, thereby extending the sensor's lifespan and accuracy.
Implementation Method 1
the polymer membrane comprises an antimicrobial agent disposed therein
Implementation Method 2
a hydrogel coating disposed thereon
Data Source
AI summary
The present disclosure relates to an analyte sensor comprising a working electrode, a sensing layer disposed on at least a portion of the working electrode that comprises an analyte-responsive enzyme, and a polymer membrane overcoating at least the sensing layer. The polymer membrane comprises an antimicrobial agent disposed therein, a hydrogel coating disposed thereon, or both an antimicrobial agent disposed therein and a hydrogel coating disposed thereon. The presence of an antimicrobial agent, such as an antibiotic, a hydrogel coating, or both reduces early/late signal attenuation of the analyte sensor. The polymer membrane can further be combined with a metal-containing layer in electrochemical communication with a reference electrode, a counter electrode, and/or second working electrode.