Bioerodible Endoprosthesis Coating Segmentation for Controlled Erosion
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Solution Overview
Problem
Existing bioerodible endoprostheses face challenges in controlled erosion within the body, where the coating may separate prematurely from the bioerodible body, leading to incomplete degradation and potential complications.
Innovation Solution
A bioerodible endoprosthesis design featuring a body with a coating that includes strategically arranged regions allowing physiological fluids to contact the body, forming a galvanic couple with the coating, ensuring the body erodes isotropically while the coating remains intact, with the spacing and arrangement of regions optimized to prevent premature separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the coating is applied over the entire body surface, then the body is protected from erosion, but the erosion process cannot proceed completely through the body thickness
Solution Approach 1:
The coating is segmented into multiple discrete regions rather than forming a continuous layer. These regions are spaced apart to allow physiological fluids to access the body surface at multiple locations, enabling complete erosion while the coating remains intact in the spaces between regions
Solution Approach 2:
Different regions of the body surface have different coating characteristics. The coating regions provide protection where needed, while the spaced arrangement allows localized erosion access points. This creates non-uniform erosion patterns that achieve complete degradation
2Productivity
If the coating regions are spaced closely, then the body erodes faster, but the coating may separate prematurely from the body
Solution Approach 1:
The coating regions are pre-positioned at optimal spacing intervals before implantation. This preliminary arrangement ensures that as the body erodes isotropically from each region, the coating maintains adequate support and adhesion, preventing premature separation while allowing sufficient erosion rate
Solution Approach 2:
The spaced coating regions act as anchor points that cushion and support the coating structure during the erosion process. The spacing is designed to provide adequate mechanical support while still allowing fluids to reach the body surface for erosion to proceed
3Productivity
If the body erodes anisotropically, then the erosion process is faster in certain directions, but the erosion pattern becomes unpredictable and may compromise structural integrity
Solution Approach 1:
Multiple localized erosion initiation points are created through the spaced coating regions. Each region serves as a local quality variation that promotes isotropic erosion from multiple locations simultaneously, ensuring uniform degradation patterns while maintaining predictable structural integrity throughout the erosion process
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 design ensures controlled and complete erosion of the bioerodible body while maintaining the coating, facilitating the endoprosthesis' integration with the body environment and enhancing its biocompatibility and visibility through imaging.
Implementation Method 1
The body and the coating form a galvanic couple when the endoprosthesis is implanted in a physiological environment
Implementation Method 2
the contacted areas of the body erode substantially through the body in the thickness direction
Data Source
AI summary
An endoprosthesis includes a plurality of struts defining a flow passage. At least one strut includes (a) a body comprising a bioerodible material and having a thickness and (b) a coating overlying the body. The coating includes a plurality of regions that allow physiological fluids to contact a plurality of corresponding areas of the underlying body when the endoprosthesis is implanted in a physiological environment. The plurality of regions are sized and arranged so that the contacted areas of the body erode substantially through the body in the thickness direction while the coating remains on the body when the endoprosthesis is implanted in the physiological environment.