Heterocyclic Polymer Membrane for Glucose Sensor Linearity

The patent changes the chemical composition parameters of the membrane by incorporating heterocyclic nitrogen-containing polymers (such as polyvinylpyridine) with specific molecular structures and functionalities. This allows precise control over membrane properties including thickness, porosity, and glucose permeability, thereby achieving consistent sensitivity across manufactured sensors while maintaining operability at high glucose concentrations.

The patent employs composite membrane structures combining heterocyclic nitrogen-containing polymers with crosslinking agents (such as polyethylene glycol diglycidyl ether). This composite approach creates a membrane with optimized properties: the heterocyclic polymer provides controlled glucose diffusion pathways while the crosslinking agent enhances mechanical stability and thickness uniformity, resolving both sensitivity consistency and manufacturing precision issues.

The patent applies local quality by designing the membrane with heterocyclic nitrogen-containing polymers that exhibit selective interaction properties at different locations and scales. The membrane structure provides localized glucose recognition sites while maintaining different permeability characteristics for various molecules, enabling preferential glucose transport over interferants. This selective local property allows the membrane to reduce interferant flux while maintaining linear glucose responsiveness.

The heterocyclic nitrogen-containing polymer acts as an intermediary substance in the membrane that mediates between glucose and the sensing layer. The nitrogen-containing groups in the polymer structure create specific interaction pathways that facilitate glucose diffusion while creating steric or electrostatic barriers to interferant molecules. This intermediary membrane layer selectively modulates flux based on molecular characteristics, achieving both linear glucose response and interferant reduction.