Left Atrial Appendage Occluder Fixing Frame Design
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Solution Overview
Problem
Existing left atrial appendage occluders face challenges in achieving stable fixation without piercing the atrial wall, leading to potential pericardial effusion and tamponade, and inadequate sealing to prevent thrombus migration.
Innovation Solution
A left atrial appendage occluder design featuring a sealing plate, a fixing frame with supporting rods and a connection member, allowing for adjustable positioning and deformation to ensure stable fixation and sealing, without the need for anchor bars, and an additional film for secondary sealing to prevent blood flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the fixing component is arranged at a deeper part of the cavity to reduce the risk of falling off, then the stability of fixation is improved, but the wall thickness decreases leading to increased risk of piercing
Solution Approach 1:
The fixing frame is divided into multiple supporting rods (at least three) that are distributed around the cavity, with each rod providing localized fixation. This segmentation allows the device to achieve stable fixation through distributed contact points rather than relying on deep anchoring at a single location, thereby reducing wall piercing risk while maintaining fixation stability.
Solution Approach 2:
The invention transitions from a single-point deep anchoring approach to a multi-point distributed fixation approach. By arranging at least three supporting rods around the cavity circumference, the fixation mechanism operates in a dimensional distribution pattern that spreads the fixation load across multiple locations, achieving stability without requiring deep penetration into the cavity where the wall is thinnest.
2Stability of the object's composition
If anchor bars are used to puncture the wall for fixation, then the fixation stability is improved, but the risk of pericardial effusion and tamponade increases
Solution Approach 1:
The invention extracts and removes the anchor bar component from the device structure. Instead of using puncturing anchor bars to achieve fixation, the design relies on the supporting rods that contact the cavity wall without penetration. This extraction of the harmful anchoring function eliminates the source of wall piercing and associated complications like pericardial effusion and tamponade.
Solution Approach 2:
The invention converts the potential harm of wall interaction into a beneficial non-puncturing contact mechanism. Rather than using sharp anchor bars that pierce the wall, the supporting rods are designed to gently contact and engage with the cavity wall surface, transforming the interaction from harmful penetration to beneficial surface engagement that achieves fixation without tissue damage.
3Stability of the object's composition
If the fixing frame is made rigid to provide stable support, then the fixation stability is improved, but the ability to adapt to cavity shape varies
Solution Approach 1:
The supporting rods are designed with dynamic characteristics, allowing them to flex and adapt to the cavity shape while maintaining structural integrity. This dynamic design enables the rods to conform to variations in cavity geometry during implantation and operation, providing both adaptability to different shapes and stable fixation through their ability to maintain optimal contact with the cavity wall.
Data Source
AI summary
A left atrial appendage occluder, including a closure disc, a bracket located on one side of the closure disc, and a connecting member connecting the closure disc and the bracket; the bracket includes a first fixing connection member, a second fixing connection member, and a number of support rods; the first ends of the plurality of support rods are collapsed and secured by the first fixing connection member; the second ends of the plurality of support rods are collapsed and secured by the second fixing connection member; a connecting member is connected to the first fixing connection member. The bracket is arranged such that the two ends constituted by at least two support rods have a closed structure, thus increasing the area of contact between the outer surface of the bracket and the left atrial appendage.