Braided Implant Release via Expansion Ring Notch
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Solution Overview
Problem
Current occlusion devices for treating aneurysms, such as those using embolic coils, face challenges in achieving safe packing density, repositioning, and preventing blood flow into perforator vessels, while also risking thrombotic complications and requiring ancillary devices like stents or balloons.
Innovation Solution
A braided implant delivery system with a detachable expansion ring that can be positioned and repositioned within an aneurysm, allowing for controlled occlusion of the aneurysm neck without blocking adjacent blood vessel flow, using a delivery tube and inner elongated member for precise placement and release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If embolic coils are used to fill the aneurysm sac or treat the entrance, then occlusion of the aneurysm is achieved, but achieving sufficient packing density is difficult and time consuming
Solution Approach 1:
The implant is divided into multiple strands woven into a braided structure, allowing the device to be delivered in a compressed state through a catheter and then expand to fill the aneurysm sac. This segmentation enables the implant to achieve sufficient packing density without requiring time-consuming manual coil placement
Solution Approach 2:
The braided implant is nested within a delivery catheter in a compressed state, similar to a nested doll structure. The implant can be delivered through the catheter and then deployed by expanding from the compressed configuration to the expanded configuration that fills the aneurysm sac, significantly reducing procedure time while maintaining occlusion effectiveness
2Reliability
If embolic coils are used to treat the aneurysm neck, then blood flow into the aneurysm is inhibited, but blood flow in the adjoining blood vessel may be impeded
Solution Approach 1:
The implant is designed with different local properties: the braided structure provides occlusion at the aneurysm neck while the porous or mesh-like configuration allows controlled blood flow through the implant body. This local quality differentiation enables the device to block blood flow into the aneurysm sac while maintaining flow in the adjoining parent blood vessel, preventing ischemia in downstream tissues
Solution Approach 2:
The braided implant structure creates a porous or mesh-like configuration that allows selective permeability. The porous structure enables blood flow through the implant body while maintaining occlusion at the aneurysm neck, preventing complete obstruction of the parent vessel and allowing continued perfusion of downstream tissues
3Reliability
If multiple embolic coils are used to fill the aneurysm sac, then occlusion is achieved, but the coils may reanalyze or compact due to poor coiling, lack of coverage, or aneurysm size
Solution Approach 1:
The implant transitions from a compressed delivery configuration to an expanded deployed configuration, dynamically adapting to the aneurysm sac geometry. This dynamic expansion ensures uniform distribution of the implant material throughout the aneurysm sac, providing consistent packing density and coverage without the need for complex manual coil placement techniques
Solution Approach 2:
The implant utilizes parameter changes in its structural configuration, transitioning from a compressed state during delivery to an expanded state during deployment. This parameter change ensures uniform distribution and consistent packing density throughout the aneurysm sac, eliminating the need for complex manual coil placement and reducing the risk of reanalysis or compaction
4Measurement precision
If a braided implant is used to occlude the aneurysm neck, then accurate placement is achieved, but the implant must be securely attached to the delivery tube during delivery
Solution Approach 1:
The expansion ring serves as an intermediary component between the braided implant and the delivery tube. During delivery, the expansion ring in its compressed configuration provides secure attachment to the delivery tube, ensuring accurate placement. Upon deployment, the expansion ring expands to its uncompressed configuration, automatically disconnecting from the delivery tube while maintaining implant positioning accuracy
Data Source
AI summary
Implant deployment systems can generally can include a braided implant that can be detachably attached to a delivery tube by an expansion ring that can be positioned within a notch on an outer surface of the delivery tube near a distal end of the delivery tube. The implant can be positioned within a lumen of the delivery tube and remain attached to the delivery tube as the assembly is fed through a microcatheter to a treatment site. Once the braided implant is implanted, the expansion ring can move from a collapsed configuration that is engaged with the notch of the delivery tube to a deployed configuration that releases the delivery tube, thereby releasing the braided implant from the delivery tube.