Stent Drug Coating Nozzle Dynamics to Prevent Peeling
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Solution Overview
Problem
Drug coating on stents is prone to peeling off or separation due to stress concentration and distortion caused by expanding deformation, leading to non-uniform effectiveness and poor manufacturing yields.
Innovation Solution
A manufacturing method for stents that excludes the bending portion from drug coating, using a nozzle to move past the bending portion and reduce adhesion of the coating solution, ensuring only the main strut portions are coated, thereby preventing drug loss and improving uniformity and yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the nozzle performs separating movement from the bending portion to prevent coating, then the bending portion is prevented from being coated, but the nozzle stores drug and excessively discharges it immediately after passing through the bending portion
Solution Approach 1:
The nozzle is designed to perform preliminary separating movement from the bending portion before the main coating process, allowing the bending portion to be excluded from coating while preventing drug storage. This preliminary action ensures that the nozzle does not accumulate drug at the bending portion, thereby avoiding excessive discharge immediately after passing through.
2Reliability
If the bending portion is excluded from coating, then drug peeling and separation are prevented, but the coating process becomes more complex
Solution Approach 1:
The coating device employs dynamic control of the nozzle movement, allowing the nozzle to move past the bending portion in a controlled manner. This dynamic approach enables the bending portion to be excluded from coating while maintaining a relatively simple overall process, avoiding the need for complex separate coating operations.
3Manufacturing precision
If the nozzle moves along the main strut portions to coat them, then uniform coating is achieved, but the bending portion may still receive excessive coating solution
Solution Approach 1:
The bending portion is extracted or excluded from the coating process by causing the nozzle to move past it rather than along it. This ensures that the bending portion does not receive coating solution, preventing unwanted coating while maintaining uniform coating on the main strut portions.
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 method prevents drug peeling and separation, ensuring uniform drug effectiveness and improved manufacturing yields by avoiding drug coating on the bending portion where stress concentration occurs, and reducing adhesion on the nozzle to prevent unwanted coating.
Implementation Method 1
an adhesion amount of the coating solution adhering to the nozzle is reduced while the nozzle is going past the bending portion
Data Source
AI summary
A manufacturing method of a stent is disclosed which prevents a drug from being peeled off or separated due to stress concentration or distortion resulting from the expanding deformation of the stent so that the drug is further uniformly effective and further improved yields are expected when the stent is manufactured, and a coating device. The method has a non-coating portion forming process of preventing a bending portion from being coated with the drug by causing a nozzle to go past the bending portion when the nozzle reaches the bending portion and to move toward main strut portions. In the non-coating portion forming process, an adhesion amount of a coating solution is reduced while the nozzle is going past the bending portion.