Sensor Insertion Device Opening Mechanism and Enzyme Layer
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Solution Overview
Problem
Conventional biosensors face issues with reuse of sensor insertion devices and low measurement sensitivity, particularly in glucose monitoring systems where the glucose concentration in interstitial fluid is lower than in blood, leading to inaccurate readings.
Innovation Solution
The biosensor system includes a sensor insertion device with a needle slider, disposal slider, biasing member, puncture knob, and opening mechanism to prevent accidental reuse, and a biosensor with an enzyme layer containing sodium polyacrylate to enhance measurement sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the sensor insertion device is reused after needle withdrawal, then device cost is reduced, but safety risk increases due to potential accidental reuse of used sensor supply units
Solution Approach 1:
The opening mechanism performs a preliminary action by closing the insertion hole after the needle slider moves a specific distance, preventing any subsequent insertion attempts before the device is properly disposed of or reset
Solution Approach 2:
The opening mechanism acts as an intermediary between the needle slider and the insertion hole, controlling access to the insertion hole based on the operational state of the device
2Ease of manufacture
If the enzyme layer uses conventional materials, then manufacturing simplicity is maintained, but measurement sensitivity is insufficient for detecting low glucose concentrations in interstitial fluid
Solution Approach 1:
The patent changes the chemical composition parameter of the enzyme layer by incorporating sodium polyacrylate, which enhances the sensitivity of glucose detection in interstitial fluid while maintaining compatibility with existing manufacturing processes
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 system prevents accidental reuse of sensor insertion devices and improves measurement sensitivity, allowing for more accurate glucose monitoring and convenient operation.
Implementation Method 1
a biasing member that biases the needle slider, which has moved in the sensor insertion direction, in the opposite direction from the sensor insertion direction
Implementation Method 2
an enzyme layer that is formed on the mediator layer
Implementation Method 3
the enzyme layer is configured to contain sodium polyacrylate
Data Source
AI summary
A sensor insertion device comprises a main body, needle slider, disposal slider, spring, puncture knob, and opening mechanism (window member and handle). The needle slider grips a needle and a sensor on a first end side, and is slidable inside the main body. The disposal slider is slidable inside the main body. The puncture knob has an insertion hole into which the rear end portion of the needle slider can be inserted. The opening mechanism puts the insertion hole into a closed state when the needle slider is being slid in the sensor insertion direction, and, puts the insertion hole in an open state in which the second end side of the needle slider has been inserted into the insertion hole by opening up the contact portion between the puncture knob and the second end side of the needle slider when the puncture operation is complete.