Variable Stiffness Transcutaneous Sensor Design
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Solution Overview
Problem
Conventional transcutaneous analyte sensors face challenges with motion artifacts due to host movement, leading to mechanical stresses and signal artifacts, as they lack variable stiffness configurations that could accommodate different mechanical demands along the device.
Innovation Solution
A transcutaneous analyte sensor with a variable stiffness design, featuring a distal portion that is more flexible than the proximal portion, achieved through a helical configuration with varying pitch, cross-section, or hardness, allowing for enhanced flexibility in stress-prone areas and increased stiffness for structural integrity and reliable connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the sensor is made uniformly flexible throughout, then the sensor can accommodate host movement, but the sensor loses structural integrity and connection stability
Solution Approach 1:
The sensor is designed with non-uniform stiffness distribution along its length. The distal portion (inserted in host tissue) is made more flexible to accommodate host movement, while the proximal portion (external connection portion) is made stiffer to maintain structural integrity and connection stability. This local differentiation of mechanical properties resolves the contradiction between flexibility and strength.
2Strength
If the sensor is made uniformly stiff throughout, then the sensor maintains structural integrity, but the sensor experiences mechanical stresses and signal artifacts from host movement
Solution Approach 1:
The sensor implements variable stiffness along its length, with the distal portion being more flexible to absorb mechanical stresses from host movement and the proximal portion being stiffer to maintain structural integrity. This local differentiation reduces signal artifacts while preserving overall structural strength.
3Object-affected harmful factors
If the sensor uses variable stiffness configuration, then the sensor minimizes mechanical stresses, but the sensor design becomes more complex
Solution Approach 1:
The sensor achieves variable stiffness by changing the physical parameters of the sensor body along its length. This can be accomplished through varying the cross-sectional area, wall thickness, or material properties at different positions. This parameter-based approach provides the needed flexibility gradient without requiring complex mechanical structures or multiple components.
Data Source
AI summary
The present invention relates generally to variable stiffness transcutaneous medical devices including a distal portion designed to be more flexible than a proximal portion. The variable stiffness can be provided by a variable pitch in one or more wires of the device, a variable cross-section in one or more wires of the device, and/or a variable hardening and/or softening in one or more wires of the device.