Silver Chloride Reference Electrode Regeneration for Continuous Glucose Monitoring
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Solution Overview
Problem
Conventional methods for monitoring blood glucose levels in diabetic patients are invasive, inconvenient, and often fail to detect hyperglycemic or hypoglycemic conditions in a timely manner due to the lack of continuous monitoring, leading to dangerous side effects.
Innovation Solution
An implantable electrochemical sensor with a silver/silver chloride reference electrode covered with an enzyme layer that regenerates silver chloride, maintaining reference capacity and stability for extended periods, allowing for continuous glucose monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a silver/silver chloride reference electrode is used in an electrochemical sensor, then the sensor can provide continuous glucose monitoring, but the reference electrode becomes depleted over time as silver ion is converted to silver metal, reducing reference electrode capacity and stability
Solution Approach 1:
The patent changes the chemical composition parameters of the reference electrode by incorporating oxygen-permeable materials and oxygen-generating substances (such as sodium percarbonate or glucose oxidase enzyme systems). This transforms the reference electrode from a depleting silver/silver chloride system into a regenerating system where oxygen availability is controlled and maintained, preventing silver ion depletion and maintaining reference stability for extended periods (7-14 days or longer).
Solution Approach 2:
The reference electrode incorporates self-regenerating mechanisms through oxygen-generating substances that automatically produce oxygen when exposed to body fluids. This self-service system eliminates the need for external oxygen supply and automatically replenishes oxygen consumed during the electrochemical reactions, thereby maintaining reference electrode capacity without manual intervention.
2Duration of action of stationary object
If the reference electrode capacity is increased to maintain stability, then the sensor can provide longer continuous monitoring, but the device complexity increases
Solution Approach 1:
The patent merges the oxygen-generating function directly into the reference electrode structure by incorporating oxygen-generating substances (such as sodium percarbonate particles or enzyme-catalyzed systems) within the reference electrode housing or coating. This integration combines multiple functions (reference potential generation and oxygen supply) into a single component, avoiding the need for separate oxygen reservoirs or complex delivery mechanisms.
Solution Approach 2:
The patent employs thin oxygen-permeable membranes or coatings on the reference electrode that allow controlled oxygen diffusion from the oxygen-generating substance to the electrochemical reaction site. These thin films provide selective permeability while maintaining a compact structure, enabling extended operational life without adding significant bulk or complexity to the sensor design.
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 provides stable and continuous glucose monitoring, reducing the risk of missed hyperglycemic or hypoglycemic events and enabling more informed insulin therapy decisions.
Implementation Method 1
the enzyme layer is configured, in vivo, to generate hydrogen peroxide upon exposure to a substrate
Implementation Method 2
the hydrogen peroxide regenerates silver chloride of the reference electrode such that a reference capacity of the reference electrode is increased
Implementation Method 3
A variety of sensors are known that use an electrochemical cell to provide output signals by which the presence or absence of an analyte, such as glucose, in a sample can be determined
Data Source
AI summary
Systems and methods of use for continuous analyte measurement of a host's vascular system are provided. In some embodiments, a continuous glucose measurement system includes an electrochemical sensor incorporating a silver/silver chloride reference electrode, wherein a capacity of the reference electrode is controlled.