LAA Occluder Anchoring Structure for Low-Force Tissue Engagement
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Solution Overview
Problem
Existing occlusion devices for treating vascular abnormalities, such as the Left Atrial Appendage (LAA), face challenges in achieving stable anchoring and reducing the risk of adverse events like embolization due to high radial forces and inconsistent tissue engagement.
Innovation Solution
A collapsible and expandible medical device with a disc and lobe configuration, featuring stabilizing wires with hooks and a rounded transition design, which includes multiple rows of stabilizing wires and a fabric patch for enhanced tissue engagement and reduced radial force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional occlusion devices are used with high radial forces, then the device can maintain structural integrity, but the risk of adverse events such as embolization increases
Solution Approach 1:
The device is divided into multiple functional components: a body portion with stabilizing wires for anchoring, a disc for sealing, and a fabric patch for tissue engagement. This segmentation allows each component to perform its specific function optimally without compromising overall safety
Solution Approach 2:
Different portions of the device have different properties: the stabilizing wires provide rigid anchoring at the proximal end, while the fabric patch provides flexible tissue engagement at the distal end. This local differentiation of properties allows the device to maintain structural integrity while reducing embolization risk through appropriate tissue interaction
2Stability of the object's composition
If the device uses a rigid structure for stability, then anchoring is improved, but conformability to anatomical sites deteriorates
Solution Approach 1:
The device incorporates dynamic elements through the fabric patch that can adapt its shape to conform to the anatomical site, while the stabilizing wires provide stable anchoring. The combination allows the device to be both stable and conformable
Solution Approach 2:
The device uses composite construction combining rigid stabilizing wires with flexible fabric patch material. This composite structure allows the device to simultaneously provide stable anchoring through the wires and conformability through the fabric, resolving the contradiction between rigidity and adaptability
3Device complexity
If the device has simple anchoring structures, then device complexity is reduced, but anchoring reliability deteriorates
Solution Approach 1:
The anchoring function is segmented into multiple stabilizing wires distributed around the device perimeter. Each wire provides individual anchoring points, and collectively they provide reliable anchoring without requiring a single complex anchoring mechanism
Solution Approach 2:
The stabilizing wires are integrated into the device body and automatically engage with the anatomical site upon deployment. The device performs its own anchoring function through the inherent properties of the wires and tissue interaction, eliminating the need for separate complex anchoring mechanisms
Data Source
AI summary
A collapsible and expandable medical device may include a proximal end disc having a diameter that is greater than a distal lobe of the medical device. The distal lobe may have an axial length. The proximal disc may be connected to the distal lobe by a connecting member. A stabilizing wire may be coupled to the distal lobe, and may have a backing portion, and first and second legs terminating in first and second hooks, respectively, that are configured to engage tissue at a target implant site. The stabilizing wire may have an axial length measured from a proximal-most end of the backing portion to a distal-most end of the first and second hooks when the medical device is in the expanded condition, the axial length of the stabilizing wire being between about one quarter and about one half of the axial length of the lobe.