Stent Balloon Retention via Functional Coating Interactions
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Solution Overview
Problem
Current methods for retaining stents on balloon catheters during medical procedures face limitations, including damage to coatings, weakened materials, and increased system profile, which affect the efficacy and deliverability of stent delivery systems.
Innovation Solution
Coating the stent and balloon surfaces with specific functional groups that interact to form hydrogen bonds, covalent bonds, electron donor-acceptor complexes, charge-dipole interactions, or hydrophobic interactions to enhance retention without compromising coating integrity or requiring additional steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If crimping is used to retain the stent on the balloon, then retention force is improved, but coating integrity deteriorates due to high pressure and temperature
Solution Approach 1:
A coating layer is applied to either the stent or balloon surface to act as an intermediary that enhances friction-based retention while protecting the underlying coating from damage during crimping. The coating layer absorbs the mechanical stress and thermal exposure, preventing direct damage to the drug-containing coating.
Solution Approach 2:
The crimping parameters (pressure, temperature, time) are optimized and reduced to levels that are sufficient for retention but below the threshold that would damage the coating. This involves finding the optimal parameter window that achieves adequate retention force while maintaining coating integrity.
2Force
If pillowed sections or bumps are added to the balloon to resist axial movement, then stent retention is improved, but device complexity increases
Solution Approach 1:
The complex structural modifications (pillowed sections, bumps, ridges) are removed from the balloon design. Instead, a simpler coating approach is used that provides axial retention through friction and adhesion without requiring additional structural elements.
3Force
If adhesives are used to bond the stent to the balloon, then retention is improved, but additional deployment steps are required
Solution Approach 1:
Instead of using permanent adhesives that require additional removal steps, a disposable coating layer is used that provides sufficient retention during delivery but can be easily disrupted during deployment. The coating serves its purpose temporarily and then falls away naturally.
4Force
If a sheath is added to surround the stent, then retention during delivery is improved, but system profile increases
Solution Approach 1:
The mechanical sheath structure is replaced with a molecular-level coating system that provides retention through chemical and physical interactions (friction, adhesion, hydrogen bonding) rather than mechanical confinement. This eliminates the need for additional external structures.
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
Improves the retention force between stent and balloon surfaces, ensuring effective delivery and deployment of stents while maintaining coating integrity and reducing system profile, particularly beneficial for bifurcated vessels and drug-eluting stents.
Implementation Method 1
coating a surface of one medical device such as a stent with a coating that includes a hydrogen bond donor and coating a surface of another medical device such as a balloon with a coating that includes a suitable acceptor atom or molecule. The method further includes interacting the coated surfaces to produce a plurality of hydrogen bonds between the surfaces
Implementation Method 2
coating a surface of one medical device such as a stent with a coating that includes a host molecule and coating a surface of another medical device such as a balloon with a coating that includes a guest atom or molecule. The method further includes interacting the coated surfaces to produce a plurality of covalent bonds between the surfaces
Implementation Method 3
coating a surface of one medical device such as a stent with a coating that includes a donor molecule and coating a surface of another medical device such as a balloon with a coating that includes an acceptor. The method further includes interacting the coated surfaces to produce a plurality of electron donor-acceptor complexes between the surfaces
Implementation Method 4
coating a surface of one medical device such as a stent with a coating that includes a dipolar functional group and coating a surface of another medical device such as a balloon with a coating that includes a charged functional unit. The method further includes interacting the coated surfaces to produce a plurality of charge-dipole interactions between the surfaces
Implementation Method 5
coating a surface of one medical device such as a stent with a coating that includes a hydrophobic group and coating a surface of another medical device such as a balloon with a coating that includes a hydrophobic group. The method further includes interacting the coated surfaces to produce a plurality of hydrophobic interactions between the surfaces
Data Source
AI summary
A method for improving the retention between the surfaces of medical devices. The method includes coating a surface of one medical device such as a stent with a coating that includes a functional group and coating a surface of another medical device such as a balloon with a coating that includes an identical or different functional group. The method further includes interacting the coated surfaces to produce a plurality of bonds between the surfaces, thereby improving retention.