Ligation Device With Direct Thread Winding Mechanism
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Solution Overview
Problem
Existing suturing devices fail to directly wind a thread around the outer periphery of a ligation object during ligation, requiring additional steps and components for thread attachment.
Innovation Solution
A ligation device with a columnar main body, movable jaw portions, and a thread feed rod system that allows direct winding of a thread around the ligation object by positioning the thread hook closer to the distal end of the jaw portion, intersecting passage holes, and overlapping the thread engagement portion with the hook passage hole.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a U-shaped suture strip is attached for each securing operation, then the ligation object can be ligated, but the suture strip needs to be attached to the suturing device for each operation, causing difficulty and increasing operation time
Solution Approach 1:
The thread is preliminarily engaged with the thread engagement portion of the thread feed rod before the ligation operation. The thread feed rod is preliminarily positioned to protrude from the first jaw portion when the second jaw portion is at the holding position, so that the thread is ready to be wound around the ligation object without requiring attachment operations during the actual ligation process.
Solution Approach 2:
The thread feed rod automatically positions itself to protrude from the first jaw portion when the second jaw portion is at the holding position, and the thread engagement portion automatically engages with the thread. This self-positioning mechanism eliminates the need for manual attachment operations, allowing the device to serve itself during the ligation process.
2Volume of moving object
If the thread engagement portion is positioned inside the first jaw portion, then the device structure is compact, but the thread cannot be directly wound around the ligation object
Solution Approach 1:
The thread feed rod is made movable between a retracted position where the thread engagement portion is inside the first jaw portion and a protruding position where it extends outward. When the second jaw portion is at the holding position, the thread feed rod automatically transitions to the protruding position, enabling the thread to be wound around the ligation object. This dynamic positioning resolves the contradiction between compact structure and operational functionality.
3Device complexity
If the hook passage hole and thread feed rod passage hole are separate, then the device structure is simple, but the thread hook portion cannot effectively catch the thread engaged with the thread engagement portion
Solution Approach 1:
The hook passage hole and thread feed rod passage hole are designed to partially intersect each other, creating a nested spatial relationship. This intersection allows the thread hook portion to effectively catch the thread engaged with the thread engagement portion while maintaining a relatively simple device structure. The intersecting passages enable the thread to be transferred from the thread feed rod to the thread hook portion through the shared spatial region.
Data Source
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AI summary
Provided is a ligation device that can readily wind a thread used for ligating a ligation object around a ligation object in ligation of the ligation object. According to a ligation device 10, when a notch 44 of a ligation thread hook 34 or a notch 56 of a resetting thread hook 54 is located closer to a distal end of a second jaw portion 18 in a long side direction than an intersection position of a first thread-hook passage hole 38 and a thread feed rod passage hole 42 and a thread feed rod 64 is at a protruding position, a thread engagement portion 74 of the thread feed rod 64 is located further from a first jaw portion 12 than the first thread-hook passage hole 38 in a z-direction as a first short side direction and at a position overlapping the first thread-hook passage hole 38 in a y-direction, that is, a second short side direction. Thus, a thread T can be wound around an outer periphery of a ligation object 32 by holding the thread by a thread hook.