Sensor Terminal Layout for Low-Friction Glucose Measurement
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Solution Overview
Problem
In blood glucose measurement systems, friction between the measurement device and the sensor leads to damage of terminals due to the insertion process, causing issues with the accuracy and reliability of measurements, especially when multiple conductive terminal portions are required to measure additional parameters like hematocrit.
Innovation Solution
A measurement device with a dual terminal group configuration where the first terminal group contacts the sensor closer to the insertion port and receives reduced normal forces compared to the second terminal group, minimizing damage by distributing the stress more evenly and reducing friction during sensor insertion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple conductive terminal portions are added to measure additional parameters like hematocrit, then measurement capability is improved, but friction and terminal damage during insertion increase
Solution Approach 1:
The terminals are divided into two groups: a first terminal group closer to the insertion port and a second terminal group farther from the insertion port. This segmentation allows different normal forces to be applied to different terminal groups, reducing overall friction and terminal damage during insertion while maintaining multiple measurement capabilities.
Solution Approach 2:
Different normal forces are applied to different terminal groups based on their local positions. The first terminal group receives a first normal force while the second terminal group receives a second normal force, optimizing the balance between measurement capability and reducing terminal damage at each location.
2Reliability
If normal forces on terminals are increased to ensure good contact, then electrical connection reliability is improved, but friction and surface wear increase
Solution Approach 1:
The terminals are segmented into two groups with different normal force applications. This allows sufficient normal force to be applied to ensure good electrical contact reliability while distributing the friction load, thereby reducing surface wear on the sensor contact surface.
Solution Approach 2:
The normal force parameter is changed and differentiated between the two terminal groups. By applying different normal forces to different terminal groups, the system optimizes the balance between ensuring reliable electrical connection and minimizing friction-induced surface wear.
3Reliability
If the sensor insertion distance is increased to reach all terminals, then complete electrical connection is achieved, but friction and insertion force increase
Solution Approach 1:
The terminals are arranged in two groups at different positions along the insertion direction. This segmentation allows the sensor to make contact with both terminal groups during insertion, achieving complete electrical connection while distributing the insertion force requirement and reducing peak friction.
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 solution effectively reduces terminal damage and enhances the reliability of measurements by minimizing normal forces on the first terminal group, which moves further, thereby reducing friction and surface wear, while maintaining sufficient force on the second terminal group for accurate data acquisition.
Implementation Method 1
friction inevitably occurs between a terminal included on a measurement device side and a sensor surface from an insertion start position to an insertion completion position
Implementation Method 2
the plural terminals receive normal forces from the contact surface by pressing the contact surface
Data Source
AI summary
A measurement device including an insertion port into which a sensor is inserted and plural terminals that contacts the sensor, wherein the terminals slide on a contact surface of the sensor at which a measurement target component is measured, a first electrode group located on a rear end side and a second electrode group located on a farther distal end side are provided on the contact surface, the plural terminals receive normal forces from the contact surface and include a first terminal group that contacts the first electrode group on a side closer to the insertion port than a side on which a second terminal group contacts the second electrode group, and a sum of normal forces that the first terminal group receives from the contact surface is smaller than a sum of normal forces that the second terminal group receives from the contact surface.