Plasma-Modified Aortic Implants for Endoleak-Resistant Sealing
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Solution Overview
Problem
Current endovascular stent grafts face complications such as Type 1 and Type 2 endoleaks, limb graft occlusions, and graft infections due to inadequate sealing, thrombogenicity, and bacterial adherence, which compromise the success of aortic aneurysm treatments.
Innovation Solution
Plasma treatment is applied to modify the surface characteristics of endovascular stent grafts, including outer and inner surfaces, to enhance cellular adhesion and ingrowth, decrease thrombogenicity, and promote immune system modulation, using plasma treatments like chemical vapor deposition to alter surface roughness, smoothness, and covalently bond molecules for improved interaction with the aortic environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional stent graft surfaces are used, then the implant structure is simple and manufacturing is easy, but cellular adhesion is insufficient and endoleaks occur
Solution Approach 1:
The plasma treatment is applied to the stent graft surface before implantation to pre-establish cellular adhesion properties. This preliminary modification ensures that when the implant is deployed, the surface is already optimized for cellular attachment and sealing, preventing endoleaks from the outset rather than requiring corrective measures later.
Solution Approach 2:
The plasma treatment process modifies surface parameters including roughness, energy, and chemical composition without changing the bulk material properties. By adjusting plasma treatment parameters (gas composition, power, duration), the surface characteristics can be optimized for maximum cellular adhesion while maintaining the structural integrity and simplicity of the original stent graft design.
2Reliability
If conventional stent graft surfaces are used, then manufacturing is straightforward, but thrombogenicity is high causing limb graft occlusions
Solution Approach 1:
Plasma treatment modifies surface parameters such as energy, roughness, and chemical composition to reduce thrombogenicity. The process makes the surface more hemocompatible by controlling protein adsorption and cellular interaction, thereby preventing thrombus formation and limb graft occlusions while maintaining manufacturing efficiency.
Solution Approach 2:
The plasma treatment creates a composite surface structure where the original graft material is combined with plasma-deposited layers containing beneficial molecules (such as heparin, albumin, or other biocompatible substances). This composite surface structure provides thrombogenicity resistance while the underlying material retains its manufacturing advantages.
3Reliability
If conventional stent graft surfaces are used, then the structure is simple, but bacterial adherence is high leading to graft infections
Solution Approach 1:
Plasma treatment modifies surface parameters including energy, roughness, and chemical composition to create surfaces that resist bacterial adherence. The treatment can incorporate antimicrobial molecules or create surface characteristics that prevent bacterial colonization, thereby reducing graft infection risk while maintaining structural simplicity.
Solution Approach 2:
The plasma treatment process can convert potentially harmful surface characteristics (such as high energy surfaces that attract contaminants) into beneficial properties by controlling the deposition of specific molecules that actively resist bacterial adherence. The same plasma process that might seem to add complexity actually simplifies infection prevention by creating inherently resistant surfaces.
4Reliability
If plasma treatment is applied to modify surface characteristics, then cellular adhesion and endothelialization are enhanced, but surface treatment complexity increases
Solution Approach 1:
The plasma treatment is performed as a preliminary step before implantation to pre-establish strong cellular adhesion properties and promote endothelialization. By preparing the surface in advance with optimal characteristics for cell attachment and growth, the implant achieves better integration and sealing without requiring complex post-implantation treatments or modifications.
Solution Approach 2:
The plasma treatment process allows for precise control of surface parameters (roughness, energy, chemical composition) to optimize cellular adhesion. By adjusting treatment parameters such as gas composition, power levels, and duration, the surface can be tailored for maximum cellular interaction while keeping the treatment process itself relatively simple and efficient.
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 plasma-modified stent grafts reduce endoleaks, limb graft occlusions, and graft infections by promoting strong cellular adhesion and endothelialization, thereby enhancing the therapeutic success and safety of aortic aneurysm treatments.
Implementation Method 1
plasma treatment is applied to modify the surface characteristics of endovascular stent grafts, including outer and inner surfaces... using plasma treatments like chemical vapor deposition to alter surface roughness, smoothness, and covalently bond molecules
Implementation Method 2
The plasma modified outer surface landing region may include covalently bonded molecules imparted from feed molecules of a plasma treatment
Data Source
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AI summary
An endovascular implant including a tubular body. The tubular body extends along a longitudinal axis and is bounded by a proximal end and a distal end. The tubular body has an outer surface and an inner surface. The tubular body has an outer surface region including the outer surface and an inner surface region including the inner surface and a bulk region extending therebetween. The tubular body includes an outer surface landing region within the outer surface region and proximate at least one of the proximal and distal ends of the tubular body. The outer surface landing region is configured to align with one or more landing walls of one or more vessels. The outer surface landing region includes a plasma modified outer surface landing region having a different surface compared to an unmodified outer surface landing region.