Left Atrial Appendage Clip Deployment for Secure Clot Blocking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Cardiac arrhythmias, particularly atrial fibrillation, lead to reduced blood flow in the left atrial appendage (LAA), increasing the risk of clot formation and stroke due to clots entering the bloodstream.
Innovation Solution
A clip system is designed to close the LAA, comprising an elongate shaft with engagement arms and a retention mechanism to deploy and secure a clip that compresses the LAA, using a spring to maintain closure and prevent clot passage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a clip system is used to close the LAA, then the risk of stroke is reduced by preventing clot passage, but the device complexity increases due to the need for delivery systems and retention mechanisms
Solution Approach 1:
The clip is nested within the delivery system, with the retention mechanism integrated into the delivery catheter. The compression element is contained within the clip structure, creating a nested configuration that allows the complex system to be delivered through a single catheter while maintaining all necessary functions for reliable LAA closure and stroke prevention
Solution Approach 2:
The device is segmented into distinct functional modules: the clip with jaws for LAA grasping, the compression element for closing, and the retention mechanism for secure positioning. This segmentation allows each component to be optimized independently while working together as an integrated system, balancing complexity with reliability
2Reliability
If the clip is secured with a retention mechanism, then the clip remains firmly attached to the LAA, but the ease of operation is reduced due to additional retention steps
Solution Approach 1:
The retention mechanism is pre-configured within the delivery system, with retention arms or features already in position to engage the clip. The compression element is pre-loaded in a compressed state within the clip, ready for deployment. This preliminary preparation simplifies the actual deployment operation while ensuring reliable attachment, as the complex retention features are already arranged correctly before reaching the LAA
3Reliability
If the LAA is compressed to close the appendage, then clot passage is prevented, but the force applied may cause tissue damage
Solution Approach 1:
The compression element is designed to apply controlled force with specific pressure parameters that are sufficient to close the LAA and prevent clot passage but remain below the threshold for causing tissue damage. The compression force can be adjusted by changing the compression element material properties, jaw geometry, or activation mechanism, allowing optimization of the force parameter to balance effectiveness with tissue safety
Solution Approach 2:
The compression element uses flexible materials that can conform to the LAA tissue surface, distributing the compression force evenly across the tissue rather than concentrating it at discrete points. This flexible approach prevents localized tissue damage while maintaining effective closure, as the force is spread over a larger area reducing peak stress on any single point of tissue
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
The clip system effectively reduces the risk of stroke by preventing clots from entering the bloodstream by securely closing the LAA, enhancing blood flow efficiency and minimizing the passage of undesired materials.
Implementation Method 1
a spring configured to force the first jaw and the second jaw together to compress the portion of the heart
Data Source
AI summary
A clip may be configured to close the portion of the heart, to reduce blood flow therethrough as well as passage of clots or other undesired materials. The clip may be configured to close the left atrial appendage (LAA). The closure of the LAA may reduce the possibility of stroke or other maladies stemming from fluid flow with the LAA. Delivery systems may comprise expansion apparatuses for a left atrial appendage clip. The expansion apparatuses may include retention mechanisms for retaining the clip.