Radiopaque Stent Markers with Through-Holes for Plug Welding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing stent marking techniques are costly and complex, with manufacturing inefficiencies due to the need for specially formed struts and small, difficult-to-handle radiopaque marker coils, which are exacerbated by the requirement for multiple markers.
Innovation Solution
A radiopaque marker design with an inner surface adapted for engagement with a stent strut, featuring an outer surface and a thickness with through-holes for secure welding, allowing for efficient assembly and placement on stent struts using projections for stabilization during welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If radiopaque marker coils are used with threaded struts, then radiopaque markers can be secured to stents, but manufacturing complexity and cost increase due to specially formed struts and difficult handling of small marker coils
Solution Approach 1:
The marker is segmented into discrete planar elements that can be individually positioned and welded to the strut, rather than using a continuous coil. This segmentation simplifies manufacturing by eliminating the need for complex threading and coil winding operations.
Solution Approach 2:
The mechanical threading system is replaced with a welding system. Instead of mechanically securing the marker to the strut through threads and adhesive, the marker is directly welded to the strut surface, simplifying both the marker design and the assembly process.
2Measurement precision
If small diameter marker coils are used, then radiopaque markers can be positioned on stent struts, but handling and manufacturing difficulty increase
Solution Approach 1:
Instead of using traditional three-dimensional coil markers, the invention uses two-dimensional planar marker elements that replicate the essential radiopaque function. These planar markers are easier to manufacture and handle while providing sufficient visualization under fluoroscopy.
Solution Approach 2:
The marker geometry is changed from a three-dimensional coil structure to a two-dimensional planar structure. This parameter change dramatically improves ease of manufacture and handling while maintaining the radiopaque visualization function.
3Reliability
If multiple radiopaque markers are required on stents, then stent positioning and visualization are improved, but manufacturing inefficiencies are multiplied
Solution Approach 1:
The simplified marker design with welding holes serves multiple functions: it provides radiopaque visualization, enables precise positioning on the strut, and facilitates efficient welding attachment. This multi-functional design maintains positioning reliability while improving manufacturing efficiency across all markers on the stent.
4Reliability
If UV adhesive is used to hold marker coils, then marker attachment is achieved, but manufacturing process complexity increases
Solution Approach 1:
The UV adhesive component is extracted from the assembly process. Instead of using adhesive to secure the marker, the invention uses direct welding through the marker's integrated welding holes, eliminating the need for adhesive application and curing steps.
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
This solution enhances manufacturing efficiency and assembly by simplifying the process of attaching radiopaque markers to stents, reducing costs and handling difficulties, while ensuring secure and long-term fixation.
Implementation Method 1
A weld is at least partially received by the through-hole to secure the radiopaque marker to the strut
Data Source
AI summary
Radiopaque markers for use with stents implantable within a body vessel are provided with one or more through-holes. Each through-hole extends through the thickness of the marker to expose a portion of the stent underlying the marker. The marker is welded to the stent through each through-hole. Also provided are stents incorporating a radiopaque marker having one or more through-holes suitable for receiving a plug weld. Methods are provided for securing a radiopaque marker having one or more through-holes to a stent via welds.