LAA Occluder Traction Structure for Retrieval and Entanglement Prevention
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Solution Overview
Problem
Existing LAA occluders do not allow easy passage, positioning, orientation, or retrieval, leading to challenges in implantation and a low success rate for occlusion and retrieval.
Innovation Solution
The LAA occluder design includes an occluding stent with a traction structure that allows for re-positioning and release, featuring a proximal and distal securing member, a hollow guide member for wire passage, and a mechanism to collapse and expand, facilitating easy retrieval and reducing the risk of entanglement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If existing LAA occluders are designed without guide wire passage capability, then the occluder structure can be simplified, but implantation becomes difficult and retrieval success rate drops to very low levels
Solution Approach 1:
The occluder is divided into multiple independent components: a delivery catheter, an occluding disc with central lumen, and a retrieval snare. The guide wire can pass through the central lumen of the occluding disc, enabling both implantation and retrieval functions. This segmentation allows the occluder to maintain structural simplicity while gaining guide wire passage capability for reliable retrieval.
2Reliability
If the occluder is designed to be entirely anchored in the LAA, then occlusion effectiveness is improved, but re-positioning and retrieval become extremely difficult
Solution Approach 1:
The occluder system incorporates dynamic control through the delivery catheter and retrieval snare mechanisms. The occluding disc can be deployed in a controlled manner and can be retrieved by engaging the snare through the central lumen. This dynamic design allows the occluder to be firmly anchored during occlusion while maintaining the capability for re-positioning or retrieval if needed, resolving the contradiction between anchoring effectiveness and operational flexibility.
3Device complexity
If the sheath is designed to position the occluder after guide wire withdrawal, then the implantation process is simplified, but the sheath becomes prone to straightening and unfavorable orientation
Solution Approach 1:
The guide wire serves as an intermediary element that remains in place during occluder deployment. The occluding disc is deployed around the guide wire, which maintains the catheter's curved configuration and prevents straightening. The guide wire acts as a stabilizing mediator that allows simplified implantation while maintaining proper sheath orientation and configuration throughout the procedure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances surgical success rates by allowing easy orientation and retrieval of the occluder, reducing the risk of entanglement, and maintaining anchor safety during repeated procedures.
Implementation Method 1
movement of the distal securing member toward the proximal securing member is able to cause the occluding stent to transition from an expanded configuration to a collapsed configuration
Data Source
AI summary
A left atrial appendage (LAA) occluder and an LAA occlusion system are disclosed. The LAA occluder enables an increased surgical success rate by allowing repeated good positioning, retrieval and release of the occluder and avoiding the problem of entanglement of the occluding stent during surgery. The LAA occluder includes an occluding stent, a proximal securing member a distal securing member. The occluding stent includes an occlusion structure and a traction structure. The delivery device includes a hollow push tube and a control shaft. The distal securing member can be driven by the control shaft to move toward the proximal securing member until a first distal end of the occlusion structure is in a collapsed configuration, where the distal securing member is blocked from further movement, avoiding the problem of entanglement arising from inward rolling of the occluding stent in the vent of human error.