Reinforced Diffusion Membranes for Implantable Chemical Sensors
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Solution Overview
Problem
Implanted chemical sensors using soft hydrophilic polymers face challenges with structural integrity and deformation, leading to diminished response and loss of function, especially as they increase in size.
Innovation Solution
Incorporation of structural reinforcing elements, such as porous rigid polymers or ceramics, within the outer barrier layer to provide stability and maintain sensor integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If soft hydrophilic polymers are used for the outer barrier layer to enable analyte permeation, then analyte transport is improved, but structural integrity deteriorates
Solution Approach 1:
The patent combines soft hydrophilic polymers with rigid structural materials (such as rigid polymers, metals, or ceramic materials) to create a composite outer barrier layer. This composite structure allows the sensor to maintain structural integrity while enabling sufficient analyte permeation through the hydrophilic polymer component.
Solution Approach 2:
The patent applies different material properties to different regions or aspects of the outer barrier layer. The hydrophilic polymer provides analyte permeation pathways, while the rigid structural material provides mechanical support. This local differentiation of material functions resolves the contradiction between softness for transport and rigidity for strength.
2Measurement precision
If sensor size is increased to improve detection capability, then measurement precision is improved, but structural stability deteriorates
Solution Approach 1:
By incorporating rigid structural materials within the outer barrier layer, the patent enables sensors to be manufactured at larger sizes without suffering from deformation or loss of structural stability. The rigid material provides the necessary mechanical support for larger sensor geometries.
Solution Approach 2:
The patent introduces a new structural dimension by embedding rigid structural elements (such as struts, beams, or frameworks) within the outer barrier layer. This additional structural dimension provides mechanical support that enables larger sensor sizes while maintaining stability.
3Reliability
If outer barrier layer is made softer to enhance analyte diffusion, then analyte transport is improved, but sensor response deteriorates
Solution Approach 1:
The patent uses composite materials where the hydrophilic polymer component facilitates analyte diffusion while the rigid structural material maintains the structural integrity necessary for proper sensor response. This prevents the sensor from deforming or losing function over time.
Solution Approach 2:
The patent creates different functional zones within the outer barrier layer where the hydrophilic polymer provides diffusion pathways and the rigid structural material provides mechanical stability. This local functional differentiation allows softness for diffusion without sacrificing response quality.
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
Ensures the chemical sensors maintain structural integrity and functionality over their lifespan, enabling continuous analyte concentration measurement without deformation.
Implementation Method 1
the top of the outer barrier layer of the sensing element includes a polymeric matrix permeable to analytes
Data Source
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AI summary
Embodiments herein relate to implantable chemical sensors for detecting a physiological analyte and medical devices including the same. In an embodiment, an implantable medical device is included. The implantable medical device can include a chemical sensor configured to detect an ion concentration in a bodily fluid. The chemical sensor can include a sensing element. The sensing element can include an outer barrier layer forming a top, a bottom, and opposed sides of the sensing element and a structural reinforcing element contacting the outer barrier layer. The top of the outer barrier layer of the sensing element can include a polymeric matrix permeable to analytes.