Aneurysm Occlusion Element for Neck Coverage Without Coil Mass Effect
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Solution Overview
Problem
Existing treatments for aneurysms, such as open surgery and endovascular procedures, are invasive, time-consuming, and can lead to complications like brain swelling, thrombosis, and stroke, while endovascular devices require additional medications and have limitations in treating ruptured aneurysms.
Innovation Solution
A catheter system with an occlusion element that expands to cover the neck of the aneurysm, using biocompatible materials and anchoring members to minimize disruption and promote endothelialization, allowing for minimally invasive treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coils are inserted to fill the aneurysm volume, then blood flow stagnation and clotting are induced, but mass effect occurs causing brain swelling and new symptoms
Solution Approach 1:
The occlusion device is divided into multiple segments or struts that can be deployed in a controlled manner to fill the aneurysm volume gradually, reducing mass effect while achieving effective occlusion
Solution Approach 2:
The device occludes only the necessary portion of the aneurysm neck to achieve thrombosis without completely filling the entire aneurysm volume, thereby avoiding excessive mass effect and brain swelling
2Reliability
If stent device is placed to promote blood flow past the aneurysm, then thrombosis inside the aneurysm volume is achieved, but side branches become trapped or jailed
Solution Approach 1:
The occlusion device is designed with varying strut densities - denser at the aneurysm neck for effective occlusion and sparser in the body to allow side branch passage, providing localized quality differences to solve the contradiction
Solution Approach 2:
The device structure allows for dynamic adjustment or selective deployment patterns that can adapt to the specific anatomy, enabling optimization of occlusion effectiveness while preserving side branch access
3Reliability
If tight weave stent is used to divert blood flow, then flow diversion effectiveness increases, but access to aneurysm volume or jailed artery is impeded
Solution Approach 1:
The device incorporates regions of different weave densities - tight weave at the neck for effective flow diversion and loose weave or open structure in the body for facilitating access and potential secondary procedures
4Reliability
If multiple coils are used to fill large aneurysm volume, then complete occlusion is achieved, but procedure time increases and coil compaction occurs
Solution Approach 1:
Multiple coil segments are pre-assembled or deployed in a coordinated manner as a unified structure, reducing the number of individual deployment steps and overall procedure time while achieving complete occlusion
Solution Approach 2:
The device is pre-configured or pre-loaded with the necessary coil structure before insertion, allowing for rapid deployment that reduces procedure time and minimizes the risk of coil compaction during the insertion process
Data Source
AI summary
An apparatus for treating an aneurysm in a blood vessel includes a wire to be advanced within a tube and an occlusion element disposed on the wire. The occlusion element includes a cover and an inner anchoring member. The occlusion element is configured to fit within the tube and slide out of an opening at distal end of the tube in response to movement of the wire. The cover is configured to expand to an expanded configuration when advanced into the aneurysm, wherein the cover comprises a diameter that is greater than the diameter of a neck portion of the aneurysm and is configured such that a first portion of the cover contacts an interior surface of the aneurysm and a second portion covers the neck portion of the aneurysm. The inner anchoring member extends from the cover portion and is configured to contact the interior surface of the aneurysm.