LAA Ligator Hanger Knot Mechanism
Solution Overview
Problem
Traditional ligators for the left atrial appendage (LAA) are inconvenient for automatic knotting, requiring external appliances and resulting in longer operation times and reduced efficiency.
Innovation Solution
A left atrial appendage ligator comprising a ligature and an operating handle with a detachable feeding pipe and locking pipe, featuring a hanger knot mechanism for automatic knotting, allowing for efficient and quick ligation of the LAA.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a traditional ligator is used for LAA ligation, then the structure is simple, but automatic knotting is inconvenient and external appliances are needed
Solution Approach 1:
The patent combines the feeding function and locking function into a single integrated device. The feeding pipe delivers the ligature to the LAA while the locking pipe simultaneously secures the knot, merging multiple operations into one unified tool that achieves automatic knotting without external appliances
Solution Approach 2:
The ligature is pre-loaded onto the feeding pipe before the procedure. The hanger knot is pre-formed and positioned on the ligature, allowing the device to perform automatic knotting by simply delivering the pre-prepared ligature to the target site and locking it in place
2Productivity
If external appliances are applied for LAA ligation operation, then knotting can be achieved, but operation time is long
Solution Approach 1:
The feeding pipe and locking pipe are combined into a single integrated device that performs both ligature delivery and knot securing in one operation. This eliminates the need for separate external appliances and sequential operations, significantly reducing procedure time while maintaining effective LAA ligation
Solution Approach 2:
The device performs self-service by automatically delivering the pre-loaded ligature and securing the knot through its integrated locking mechanism. The operator simply needs to position the device and activate the locking function, eliminating the need for manual knot tying or additional external appliances
3Adaptability or versatility
If the feeding pipe and locking pipe are made detachable, then ligatures can be changed for repeated use, but the device complexity increases
Solution Approach 1:
The device is divided into detachable segments: the feeding pipe can be separated from the locking pipe. This allows the ligature to be removed and changed on the feeding pipe while keeping the locking pipe intact, enabling repeated use of the expensive locking component while allowing flexibility in ligature selection
Data Source
AI summary
A left atrial appendage ligator having a ligature and operating handle. One end of the operating handle is fixedly connected with a support rod, the inner wall of the support rod is fixedly connected with a feeding pipe and locking pipe. A first sliding groove is formed in the inner side wall of the feeding pipe. The inner side wall of the first sliding groove is slidably connected with a first sliding block. The middle part of the first sliding block is fixedly connected with a feeding push rod. One end of the feeding push rod is fixedly connected with a first hook. One side of the first sliding block is fixedly connected with a return spring. The left atrial appendage ligator has a locking push rod, ligature, hanger knot and supporting component. The ligature is prearranged on a sleeve pipe portion to form the hanger knot to avoid knotting during the operation process. During operation, the knotting can be completed only by locking the hanger knot. The sleeve pipe portion serves as support for threading the other end of the ligature to avoid automatic locking. After the sleeve pipe portion is separated from the hanger knot, the hanger knot can be pulled for automatic locking.