Automatic LAA Ligation Loop With Preset-Force Cutting
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Solution Overview
Problem
Current clinical methods for treating left atrial appendage (LAA) thrombus formation, such as oral anticoagulant drugs, radiofrequency ablation, and surgical resection, are not satisfactory in reducing stroke risk, and existing ligation devices rely heavily on visual judgment and tactile feedback for operation accuracy.
Innovation Solution
An automatic ligature-cutting ligation device with a handle assembly, catheter assembly, snare, and ligature, featuring a unidirectional contraction loop and ligature-cutting assembly, that allows for precise ligation and cutting based on preset pulling forces, reducing reliance on visual and tactile judgment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual ligation operation is used relying on visual judgment and tactile feedback, then the device structure can be simple, but the operation accuracy is insufficient
Solution Approach 1:
The ligature is designed with automatic contraction capability through a unidirectional contraction mechanism. When the loop is pulled through the snare, it automatically contracts around the LAA without requiring continuous manual adjustment, enabling the device to perform the ligation function autonomously based on the pulling action
Solution Approach 2:
The patent replaces manual visual-tactile control with a mechanical automatic contraction mechanism. The unidirectional contraction loop structure converts the pulling force directly into ligation force, eliminating the need for operator judgment and tactile feedback while improving operation accuracy
2Extent of automation
If automatic ligature-cutting function is added, then the ligation process is automated and operation accuracy is improved, but the device complexity increases
Solution Approach 1:
The ligature-cutting function is integrated into the existing ligature structure. The cutting edge is incorporated as part of the ligature itself, combining the ligation and cutting functions into a single component and operation sequence, thereby automating the process without proportionally increasing device complexity
Solution Approach 2:
The ligature is pre-configured with a cutting edge and a specific structural design that enables automatic cutting upon contraction. The cutting action is prepared in advance through the ligature's structural design, so that when the loop contracts around the LAA, the cutting function is automatically activated without requiring separate manual intervention
Data Source
AI summary
An automatic ligature-cutting ligation device and a ligation system are provided. The ligation device includes: a handle assembly, including a first handle and a second handle detachably connected to each other; a catheter assembly, an end of the catheter assembly being connected to the first handle; a snare, disposed at another end of the catheter assembly, where a slit is defined in an inner surface of the snare; a ligature, penetrating the first handle and the catheter assembly, where an end of the ligature is connected to the second handle, another end of the ligature has a loop capable of contracting in a forward direction and stopping in a reverse direction, and the loop is pre-mounted in the snare; and a ligature-cutting assembly, disposed in the second handle.