Curved-Conical Aneurysm Stent for Subarachnoid Blood Drainage
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Solution Overview
Problem
Current treatments for brain aneurysms that have ruptured or require intervention fail to effectively drain blood from the subarachnoid space, leading to increased morbidity and mortality due to rebleeding and ischaemic damage, and are not adaptable to different vessel shapes and diameters.
Innovation Solution
A stent comprising a curved conical structure, flaps, and a silicone sheath that utilizes Bernoulli's principle and flow continuity to create a vacuum effect, draining blood from the subarachnoid space while maintaining arterial circulation and preventing rebleeding, and is designed to fit various vessel anatomies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current treatments (clip placement, endovascular coiling, flow diverting stents) are used to treat ruptured aneurysms, then the aneurysm is sealed or blood flow is redirected, but blood accumulation in the subarachnoid space cannot be effectively drained, leading to increased morbidity and mortality
Solution Approach 1:
The patent applies the extraction principle by introducing a dedicated drainage system that removes blood from the subarachnoid space. The stent incorporates channels and openings that actively extract accumulated blood, separating the drainage function from the aneurysm sealing function. This allows the harmful blood accumulation to be removed while the aneurysm remains sealed.
Solution Approach 2:
The stent design combines multiple functions into a single device: it seals the aneurysm sac, redirects blood flow away from the aneurysm, and simultaneously drains blood from the subarachnoid space. This multi-functional approach addresses both the aneurysm pathology and the harmful blood accumulation without requiring separate procedures.
2Reliability
If flow diverting stents are used to redirect blood flow away from the aneurysm, then rebleeding is prevented, but the stents are not adaptable to different vessel shapes and diameters, limiting their applicability
Solution Approach 1:
The stent incorporates dynamic elements including expandable structures and adjustable components that can adapt to different vessel geometries. The stent framework includes flexible struts and cell structures that can be deployed in various configurations to match the specific anatomy of the patient's vessel, allowing the same device design to accommodate different vessel shapes and diameters.
Solution Approach 2:
The stent design allows for parameter adjustments in terms of size, shape, and structural configuration to match different vessel characteristics. The device can be manufactured in various dimensions and geometries, or deployed with adjustable parameters, enabling adaptation to the specific anatomical parameters of each patient's vasculature.
3Productivity
If the stent uses a curved conical structure to create vacuum effect for draining blood, then subarachnoid blood is effectively removed, but the complexity of the stent structure increases
Solution Approach 1:
The stent utilizes hydraulic principles by incorporating a curved conical structure that creates a vacuum effect through fluid dynamics. As blood flows through the conical channel, the varying cross-sectional area generates negative pressure that actively draws blood from the subarachnoid space into the drainage channel, enabling passive drainage without external suction devices.
Solution Approach 2:
The curved conical structure employs specific geometric curvature to optimize the vacuum effect. The curved design allows for gradual pressure changes and efficient fluid flow patterns that enhance drainage capability. The curvature is carefully designed to maintain structural integrity while maximizing the hydraulic vacuum effect for blood 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 stent effectively reduces mortality and morbidity by draining subarachnoid blood, preventing rebleeding, and maintaining arterial circulation, while being adaptable to different vessel shapes and sizes.
Implementation Method 1
A stent comprising a curved conical structure (2) that regulates blood flow within the aneurysm and reduces damage after brain haemorrhage
Implementation Method 2
A stent comprising a curved conical structure (2) that regulates blood flow within the aneurysm
Data Source
AI summary
The invention relates to a stent that reduces the damage that occurs after brain haemorrhage, for use in the treatment of aneurysms that have ruptured or require intervention. The stent of the invention comprises an exoskeleton (1), a curved conical structure (2) positioned in the centre of the stent (1), bridge (3), flap (4) and silicone sheath (5).