Left Atrial Appendage Occluder With Differential Deformation Sealing
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Solution Overview
Problem
Existing left atrial appendage occluders with split structures face issues where the fixing and sealing parts are connected in a constrained manner, leading to incomplete sealing due to the pulling action, resulting in potential blood leakage and thrombus escape, which can cause strokes or systemic embolisms.
Innovation Solution
A left atrial appendage occluder design where the sealing part has a greater radial or axial deformation capacity than the fixing part, allowing for optimal fitting and sealing of the opening, with features like braid wires, a sealing cap, and specific structural elements to enhance occlusion and reduce abrasion risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the fixing part and sealing part are connected in a constrained manner, then the device structure is simplified, but the sealing part cannot fully fit the opening due to pulling action, resulting in blood leakage
Solution Approach 1:
The occluder is divided into two independent parts: a fixing part with first braid wires and a sealing part with second braid wires. These parts can deform independently without constraining each other, allowing the sealing part to fully conform to the opening geometry while the fixing part secures the device in place.
Solution Approach 2:
Different regions of the occluder are given different deformation characteristics. The sealing part is designed with specific braid wire configuration and structural parameters that enable it to deform and adapt to the opening shape, while the fixing part has different structural characteristics optimized for anchoring stability.
2Reliability
If the sealing part deforms to fit the opening, then sealing effectiveness improves, but the fixed connecting part may be pulled off due to excessive deformation
Solution Approach 1:
The connection structure is segmented into a fixed connecting part and a movable connecting part. The movable connecting part is specifically designed to accommodate deformation of the sealing part without transmitting excessive forces to the fixed connecting part, thus preventing disconnection while maintaining sealing effectiveness.
Solution Approach 2:
The movable connecting part provides dynamic adaptation during the deformation process. It allows the sealing part to change shape and fit the opening while absorbing the mechanical stresses, preventing these forces from being transmitted to the fixed connecting part that anchors the device.
3Adaptability or versatility
If the sealing part has high deformation capacity, then it can adapt to the opening structure, but it may cause abrasion damage to the atrial appendage
Solution Approach 1:
The braid wires in the sealing part are configured with specific structural parameters including wire diameter, braid pattern, and density that are optimized to balance deformation capability with tissue protection. The local structural characteristics allow the sealing part to conform to the opening geometry while minimizing mechanical irritation and abrasion to the atrial appendage tissue.
Data Source
AI summary
A left atrial appendage occluder (200) comprises a sealing part (220), a fixing part (210) disposed at one side of the sealing part (220), and a connection part (230) for connecting the sealing part (220) and the fixing part (210). The radial deformation capacity of the sealing part (220) is greater than the radial deformation capacity of the fixing part (210), and/or, the axial deformation capacity of the sealing part (220) is greater than the axial deformation capacity of the fixing part (210). In the left atrial appendage occluder (200), the radial or axial deformation capacity of the sealing part (220) is configured to be greater than the radial or axial deformation capacity of the fixing part (210), thereby avoiding the situation in which the sealing part (220) is not optimally fitted with the opening of the left atrial appendage (10) when the fixing part (210) is placed inside of the left atrial appendage (10), which in turn enhances the occlusion effect. Additionally, the sealing part (220) has great deformation capacity which reduces the risks of the sealing part (220) causing abrasion to the opening of the left atrial appendage, or even damaging the opening of the left atrial appendage. The fixing part (210) not only avoids the risks, but also fixes the occluder in the left atrial appendage (10) more effectively, and prevents the occluder (200) from being disengaged from the left atrial appendage.