Balloon Compression Portions for Lumen Removal
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Solution Overview
Problem
Existing balloons used for treating stenosed or occluded sites in blood vessels or urethras face difficulties in removal due to interference with the lumen wall, as they either fold and protrude or get crushed and flattened upon deflation, exceeding the inner diameter of the vessel or urethra.
Innovation Solution
A balloon design featuring an outer circumferential portion that dilates to a circular cross-section with support portions forming high and low compressive strain areas, allowing for controlled deflation to a smaller size than the dilated state, minimizing interference with the lumen and facilitating easy removal, while also enabling the attachment and detachment of other members through an inner hollow portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the balloon is folded or simply deflated, then the balloon can be removed from the lumen, but the maximum width of the deflated balloon becomes greater than the inner diameter of the urethra, causing interference with the lumen wall
Solution Approach 1:
The balloon is divided into multiple compression portions (first compression portions with high compressive strain and second compression portions with low compressive strain) arranged in the circumferential direction. This segmentation allows different parts of the balloon to compress at different rates and degrees, enabling the balloon to deflect in a controlled manner that reduces its maximum width below the inner diameter of the urethra during removal.
Solution Approach 2:
Different portions of the balloon are given different compression characteristics. The first compression portions have high compressive strain while the second compression portions have low compressive strain. This local differentiation in compression properties allows the balloon to achieve uniform deflation with controlled maximum width, preventing interference with the lumen wall during removal.
2Manufacturing precision
If the balloon outer diameter is designed to be greater than the inner diameter of the urethra for uniform bonding of therapeutic sheet, then the therapeutic sheet can be uniformly bonded onto the stenosed site, but the deflated balloon cannot be removed due to interference with the urethra
Solution Approach 1:
The balloon transitions from a static large-diameter configuration during treatment to a dynamic deflated configuration during removal. The multiple compression portions enable the balloon to dynamically change its shape and size, allowing it to maintain a large outer diameter for uniform therapeutic sheet bonding during treatment, then smoothly transition to a compressed state with maximum width below the inner diameter of the urethra for easy removal.
3Duration of action of moving object
If the balloon is deflated by folding with blade portions, then the balloon can be deflated, but the blade portions interfere with the lumen and hinder balloon removal
Solution Approach 1:
The balloon uses controlled parameter changes in compression strain across different portions to achieve smooth deflation. Instead of using rigid blade portions that create sharp folds and interfere with the lumen, the balloon employs multiple compression portions with varying compressive strain parameters, enabling gradual and uniform deflation that maintains a smooth profile and prevents lumen interference during both deflation and removal.
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 balloon effectively reduces its size during deflation, preventing interference with the lumen and allowing for smooth removal, while maintaining the ability to apply force and accommodate other medical devices, enhancing treatment efficacy and procedural ease.
Implementation Method 1
the outer circumferential portion that dilates to form a hollow circular cross-section and deflates when the internal pressure thereof is reduced
Implementation Method 2
the outer circumferential portion that dilates to form a hollow circular cross-section and deflates when the internal pressure thereof is reduced
Implementation Method 3
support portions that are provided between the outer circumferential portion and the inner circumferential portion and support the deflating outer circumferential portion while compressing the outer circumferential portion
Data Source
AI summary
A balloon including an outer circumferential portion which dilates to form a hollow circular cross-section and deflates when the internal pressure is reduced, an inner circumferential portion positioned inside the outer circumferential portion, and support portions positioned between the outer circumferential portion and the inner circumferential portion to support deflating the outer circumferential portion while compressing the outer circumferential portion. The support portions form first compression portions, which have a high compressive strain, and second compression portions, which have a compressive strain lower than the first compression portions. When the outer circumferential portion deflates, the distance between the center of the circular cross-section and the maximum outer diameter portion becomes shorter than the radius of the circular cross-section formed when a minimum pressure, which is necessary for dilating the outer circumferential portion to have a circular cross-section, is applied to the outer circumferential portion.