Ligation Clip Link Mechanism for Secure Sheath Engagement
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Solution Overview
Problem
Existing endoscopic clip devices for ligating tissues face challenges in efficiently and reliably engaging and disengaging the clip with the sheath, leading to potential detachment during use.
Innovation Solution
A ligation device with a link mechanism that allows for switching between engagement and disengagement forms using an operation wire, enabling easy mounting and removal of the clip unit by manipulating the first and second links to control the interaction between the holding tube and sheath.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional clip device structure is used, then the device can perform basic ligation function, but the engagement and disengagement operations become complex and unreliable
Solution Approach 1:
The link mechanism transforms the static connection between holding tube and sheath into a dynamic, controllable engagement system. The first and second links can pivot and rotate relative to each other, allowing the mechanism to transition between engaged and disengaged states through rotational motion of the operation wire, making the operation simple and reliable
2Device complexity
If the clip device structure is simplified, then the device complexity is reduced, but the ability to securely engage and disengage the clip is compromised
Solution Approach 1:
The engagement mechanism is segmented into multiple functional components: first link, second link, operation wire, holding tube, and sheath. Each component has a specific function, and their coordinated interaction enables secure engagement and easy disengagement through a simple pulling motion of the operation wire
Solution Approach 2:
The first link is received within the second link, creating a nested structure. This nesting allows the mechanism to maintain a compact form while enabling complex engagement/disengagement motion through the relative movement of nested components driven by the operation wire
3Volume of moving object
If the link mechanism uses a nested structure, then the device compactness is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The dynamic rotational movement of the operation wire and links provides self-alignment during engagement. The motion path and geometric constraints of the pivoting links ensure proper engagement without requiring extremely tight manufacturing tolerances, as the dynamic motion compensates for minor dimensional variations
Data Source
AI summary
A ligation device includes a first arm, a second arm, a holding tube, an operation wire, a sheath, and a link mechanism having a first link and a second link which are connected to each other and engage the holding tube with the sheath, wherein the link mechanism is configured to be switch between a disengaged configuration in which engagement between the holding tube and the sheath is released and an engaged configuration in which the holding tube is engaged with the sheath due to the operation wire.