Catheter-Based Left Atrial Appendage Ligation
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Solution Overview
Problem
Current methods for ligating the left atrial appendage, such as open surgical procedures and catheter-based techniques, pose significant health risks and inefficiencies, including the need for general anesthesia, mechanical device implantation, and potential clot formation.
Innovation Solution
A novel catheter-based system that ligates the left atrial appendage on the outside of the heart using a combination of guide and ligating catheters, with expandable elements and alignment mechanisms, allowing for precise placement and contraction of a ligating element without implanting mechanical devices inside the heart.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If open surgical procedures are used to ligate the atrial appendage, then effective ligation is achieved, but the patient requires general anesthesia and chest incision which pose serious health risks
Solution Approach 1:
The patent replaces the mechanical open surgical system with a catheter-based system that delivers a ligating element through the venous system to the left atrial appendage. The ligating element is deployed via catheter navigation and activation, eliminating the need for mechanical chest incision and general anesthesia while achieving effective ligation.
Solution Approach 2:
The patent introduces a catheter as an intermediary device that delivers the ligating element to the target site through the bloodstream. The catheter system includes navigation components and deployment mechanisms that enable precise delivery without direct surgical access, serving as a mediator between the operator and the difficult-to-reach left atrial appendage.
2Ease of operation
If catheter-based techniques are used to occlude the left atrial appendage, then access is rapid and does not require major incisions, but mechanical devices are implanted inside the heart which may result in clot formation and infection
Solution Approach 1:
The patent extracts the mechanical device from the interior of the heart by using a ligating element that is delivered through the catheter but deployed outside the left atrial appendage. The ligating element remains extracardiac, eliminating the risk of intracardiac device-related clot formation and infection while maintaining the minimally invasive access benefits.
Solution Approach 2:
The patent employs a disposable ligating element that is delivered via catheter, deployed to ligate the appendage, and then discarded. This single-use approach eliminates the need for permanent mechanical devices inside the heart, reducing long-term risks of clot formation and infection associated with implantable mechanical occluders.
3Reliability
If blood thinners are used to prevent thrombus formation, then clot prevention is achieved, but substantial health risks are posed particularly to elderly patients
Solution Approach 1:
The patent performs preliminary mechanical ligation of the left atrial appendage to prevent thrombus formation before the risks of blood thinner therapy accumulate. By mechanically occluding the appendage where clots form, the need for long-term anticoagulation therapy is eliminated, avoiding the bleeding risks and other harms associated with chronic blood thinner use.
Data Source
AI summary
A novel catheter-based system which ligates the left atrial appendage (LAA) on the outside of the heart, preferably using a combination of catheters and/or instruments, e.g., a guide catheter positioned inside the left atrial appendage which may assist in locating the left atrial appendage and/or assist in the optimal placement of a ligature on the outside of the appendage, and a ligating catheter and/or instrument outside the heart in the pericardial space to set a ligating element at the neck of the left atrial appendage.