Ligation Device Locking Mechanism Eliminates Snare
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Solution Overview
Problem
Conventional ligation devices require a snare for inserting and retrieving string-shaped bodies, increasing costs and instrument complexity, and when one end of the string is fixed to the tubular body, it limits workability due to reduced freedom of movement.
Innovation Solution
A ligation device with a tubular body featuring a locking mechanism, such as a locking groove or protruding part, that allows the string-shaped body to be wound around a target and locked without needing a snare, enabling easy insertion and locking of the string without additional instruments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a snare is used to insert and retrieve the string-shaped body, then the ligation device can function, but the device complexity and cost increase
Solution Approach 1:
The patent removes the snare component from the ligation device system. Instead of using a snare to insert and retrieve the string-shaped body, the invention allows direct insertion of the string-shaped body through the tubular body's openings, eliminating the need for this additional instrument while maintaining the ligation function.
Solution Approach 2:
The tubular body is designed to serve multiple functions: it acts as both the container for the string-shaped body and the ligation tool itself. The string-shaped body can be directly manipulated through the tubular body's openings, making the tubular body a multi-functional component that replaces the need for separate snare instruments.
2Ease of operation
If one end of the string-shaped body is fixed to the tubular body in advance, then the insertion process is simplified, but the workability is reduced due to limited freedom of movement
Solution Approach 1:
The patent employs a dynamic locking mechanism that allows the string-shaped body to be inserted in a relaxed state and then locked into position only when needed. The locking part can engage with the string-shaped body at different positions along its length, providing flexibility in manipulation while maintaining stability during the ligation process. This dynamic system combines the ease of insertion with the adaptability needed for various ligation scenarios.
Solution Approach 2:
The locking mechanism changes the state of the string-shaped body from a free, movable state during insertion to a fixed, locked state during ligation. By controlling when and where the locking part engages with the string-shaped body, the system allows easy insertion followed by stable fixation, maintaining both ease of operation and workability.
3Length of moving object
If the tubular body is long to accommodate the string-shaped body, then the ligation can be performed, but it becomes difficult to insert and retrieve the string-shaped body by hand
Solution Approach 1:
The patent divides the tubular body into functional segments: a proximal opening for insertion, a distal opening for retrieval, and a locking part positioned at a specific location along the length. This segmentation allows the string-shaped body to be inserted through the proximal opening, manipulated within the tubular body, and retrieved through the distal opening, making manual operation feasible even with adequate length for the ligation task.
Solution Approach 2:
The locking part acts as an intermediary mechanism that facilitates the insertion and retrieval process. By providing a designated locking location, the system allows the string-shaped body to be securely held during manipulation while enabling easy removal through the distal opening, reducing the difficulty of manual handling despite the tubular body's length.
Data Source
AI summary
The ligation device includes a tubular body having a tubular shape and including a hollow part into which a string-shaped body can be inserted. The tubular body includes a proximal opening and a distal opening at a proximal end part and a distal end part, respectively. The proximal opening and the distal opening communicate with each other via a lumen of the tubular body. The side of a first end part of the string-shaped body can be inserted into the hollow part. The tubular body includes, on the distal end part, a locking part capable of locking the side of a second end part of the string-shaped body, after the string-shaped body is wound around the target, in a state where the first end part side of the string-shaped body is inserted into the lumen.