Strain Sensor with ALD-MLD Capacitor for Implant Monitoring
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Solution Overview
Problem
Current medical implants, such as stents and orthopedic screws, face challenges in monitoring strain and mechanical integrity due to inflammatory responses and risk of restenosis or failure from kinking or excessive strain, necessitating a means to detect abnormalities and ensure proper loading during recovery.
Innovation Solution
A strain sensor device comprising a flexible molecular layer deposition (MLD) layer between two atomic layer deposition (ALD) layers, forming a capacitor structure that detects changes in capacitance due to deformation, allowing for non-invasive monitoring of strain on implants like stents and screws.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If strain monitoring is implemented using conventional sensors, then strain information can be obtained, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the strain sensing function with the structural layers of the implant itself. The capacitor structure is formed by integrating conductive layers and dielectric layers directly into the implant architecture, eliminating the need for separate external sensors. This merging of sensing and structural functions reduces overall device complexity while maintaining strain measurement capability.
Solution Approach 2:
The implant structure serves multiple functions: it provides mechanical support, prevents restenosis, and simultaneously acts as a strain sensor. The capacitor layers are embedded within the implant structure, allowing the same device to fulfill both therapeutic and diagnostic roles, thereby reducing the need for additional separate components.
2Measurement precision
If invasive monitoring methods are used to detect stent strain, then strain information can be obtained, but patient safety is compromised due to additional invasive procedures
Solution Approach 1:
The implant performs self-monitoring through embedded capacitor structures that detect strain internally. The conductive and dielectric layers within the implant structure itself serve as the sensing mechanism, eliminating the need for external invasive sensors or additional surgical procedures. The implant monitors its own mechanical state autonomously.
3Measurement precision
If expensive imaging techniques are used to monitor implant performance, then strain information can be obtained, but cost and accessibility are reduced
Solution Approach 1:
The patent replaces expensive mechanical imaging systems with an electrical sensing mechanism based on capacitor structures. The strain measurement is achieved through electrical property changes in the embedded capacitor layers, substituting costly imaging technology with a more affordable electrical sensing approach that provides continuous monitoring capability.
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
Enables continuous monitoring of strain on implants, preventing restenosis and ensuring appropriate mechanical loading, thereby extending the lifespan and safety of medical interventions by detecting abnormalities before failure occurs.
Implementation Method 1
deformation of said flexible layer affects the capacitance measured in between the electrically conductive layers
Implementation Method 2
a flexible or compressible molecular layer deposition, MLD, layer
Data Source
AI summary
A strain sensor that includes a first atomic layer deposition layer, a flexible molecular layer deposition layer on top of the first atomic layer deposition layer, and a second atomic layer deposition layer on top of the molecular layer deposition layer.