X-ray Marker With Swellable Coating For Corrosion Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current medical implants with X-ray markers face challenges such as high viscosity issues due to high metal content, leading to reduced X-ray visibility and increased corrosion risk, especially in aqueous environments, which complicates their manufacturing and functionality.
Innovation Solution
A medical implant with a scaffold and a monolithic X-ray marker coated with an electrically insulating swellable material that increases in volume upon contact with water, preventing corrosion and ensuring proper positioning and self-passivation, thereby reducing the risk of metal-on-metal contact and corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the proportion of X-ray absorbing particles in composite markers is increased to improve X-ray visibility, then the mixture becomes highly viscous making processing impossible
Solution Approach 1:
The patent changes the physical state of the adhesive from uncured liquid to cured solid, and uses swellable polymers that change volume in response to water exposure. This allows high metal particle content (95-99 wt.%) to be processed when uncured, then locked in place after curing, resolving the viscosity contradiction
Solution Approach 2:
The invention creates a composite marker system consisting of metal particles (95-99 wt.%), uncured adhesive, and swellable polymer particles. This composite structure allows the mixture to remain processable while containing high metal content, and later provides mechanical anchoring through polymer swelling
2Ease of manufacture
If adhesive bonding is used to attach solid markers in eyelets, then the adhesive gap cannot be evenly distributed causing local metal contact and accelerated corrosion
Solution Approach 1:
The swellable polymer particles automatically expand upon water exposure to fill the adhesive gap and mechanically anchor the marker. This self-service mechanism eliminates the need for precise manual adhesive distribution and automatically prevents metal-to-metal contact, solving the corrosion problem
Solution Approach 2:
The patent applies uncured adhesive and swellable polymer particles to the marker before implantation. The preliminary placement ensures proper positioning, and the subsequent swelling action automatically creates the protective barrier against corrosion
3Productivity
If degradable polymer scaffolds are used, then mechanical properties are reduced compared to metal scaffolds
Solution Approach 1:
The patent applies different materials to different parts of the implant system: degradable polymer for the scaffold body (providing temporary support and degradation capability), and metal particles with swellable polymer coating for the markers (providing permanent X-ray visibility and corrosion resistance). This local differentiation optimizes both degradation and mechanical properties
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 solution effectively prevents corrosion and ensures reliable X-ray visibility and marker positioning, extending the service life of degradable scaffold materials and simplifying the installation process by using a swellable coating that self-centers the markers and prevents local element formation.
Implementation Method 1
The X-ray marker (5) includes an electrically insulating coating (3) upon it to prevent corrosion-promoting contact between the X-ray marker (5) and the scaffold (1)
Implementation Method 2
An electrically insulating coating (3) upon the X-ray marker (5), which is designed to be swellable so as to undergo an increase in volume upon contact with water
Data Source
AI summary
A medical implant that includes a scaffold having at least one receptacle for an X-ray marker. The scaffold includes a first metal. At least one (preferably monolithic) X-ray marker is disposed in the receptacle. The X-ray marker includes a second metal. An electrically insulating coating is upon the X-ray marker to prevent corrosion-promoting contact between the X-ray marker and the scaffold.