Aneurysm Stent Waist Flow Deflection
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Solution Overview
Problem
Conventional stents used to occlude aneurysm openings in blood vessels can lead to undesirable delayed hemorrhaging, as they block blood flow, increasing the risk of rupture rather than effectively managing blood flow around the aneurysm.
Innovation Solution
A stent with narrowed waist portions positioned upstream of the aneurysm opening, deflecting blood flow away from the aneurysm to decrease the amount and rate of blood entering the aneurysm, while maintaining an uninterrupted tubular configuration adjacent the opening to manage blood flow effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional stents are used to occlude aneurysm openings, then blood flow into the aneurysm is blocked, but delayed hemorrhaging and rupture risk increase
Solution Approach 1:
Instead of blocking blood flow into the aneurysm (conventional occlusion approach), the invention inverts the approach by using waists to redirect flow around the aneurysm while maintaining patency. The waists create a flow diversion effect that reduces blood entry into the aneurysm without complete occlusion, thereby maintaining reliability and reducing rupture risk.
Solution Approach 2:
The stent incorporates localized waists (narrowed sections) at specific positions rather than uniform occlusion. These local constrictions are strategically placed to redirect blood flow away from the aneurysm opening while maintaining overall vessel patency, thus reducing aneurysm filling without complete blockage that would cause hemorrhaging.
2Quantity of substance
If complete occlusion of aneurysm opening is achieved, then blood flow into aneurysm is maximally reduced, but blood flow dynamics and vessel health deteriorate
Solution Approach 1:
The invention applies partial action by using waists to reduce (but not completely eliminate) blood flow into the aneurysm. This partial reduction is sufficient to treat the aneurysm while avoiding the harmful effects of complete occlusion, such as delayed hemorrhaging and loss of blood flow dynamics needed for vessel health.
3Ease of manufacture
If stent structure is simplified for ease of manufacture, then manufacturing cost decreases, but flow deflection capability is reduced
Solution Approach 1:
The invention changes geometric parameters of the stent by incorporating waists (narrowed sections) with specific dimensions and positions. These parameter changes enable effective flow deflection while maintaining compatibility with standard stent manufacturing processes, thus balancing manufacturing ease with functional complexity.
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 stent effectively reduces the negative effects of blood flow on the aneurysm by decreasing the amount and rate of blood entering the aneurysm, thereby minimizing the risk of rupture and promoting healthier blood flow dynamics.
Implementation Method 1
the first waist and the second waist serve in deflecting flow of blood through the blood vessel away from the opening to the aneurysm to at least decrease rates of flow of blood entering the aneurysm
Data Source
AI summary
A stent and methods for use of the stent are provided. The stent is positionable in a blood vessel adjacent an opening to an aneurysm. The stent is configured to deflect portions of blood flow away from the opening to the aneurysm to decrease the amount of blood flow entering the aneurysm and decrease the rate at which blood floor enters the aneurysm, and/or increase the amount and control the direction of the blood flow out of the aneurysm.