Clip Unit Flap Retaining Mechanism for Ligation Alignment
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Solution Overview
Problem
Existing ligation devices face challenges in precisely positioning the clip unit relative to the sheath member due to manufacturing variations and dimensional changes, leading to inconsistent expansion of flap parts and potential misalignment, which can result in slanted positioning and unreliable ligation actions.
Innovation Solution
A clip unit with a fastening ring that includes a flap part configured to expand diametrically outward and a flap retaining unit to maintain the expansion extent, ensuring precise axial alignment with the sheath member, combined with a ligation device featuring a flexible elongated sheath and a transmission member for controlled clip unit operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the flap parts are kept expanded diametrically outward by elastic resilience, then the clip unit can be positioned in relation to the sheath, but the expansion extent may fluctuate due to manufacturing variations causing slanted positioning
Solution Approach 1:
The flap retaining unit performs a preliminary action by pre-establishing a reference structure (retaining groove or retaining protrusion) that will later constrain the flap part's expansion extent. This preliminary preparation ensures that when the flap part expands during normal operation, its expansion is automatically limited to a predetermined extent, preventing slanted positioning and ensuring reliable axial alignment with the sheath.
2Adaptability or versatility
If the sheath is repeatedly used after replacing the clip unit, then reusability is achieved, but dimensional changes occur due to abrasion making it impossible to normally set the clip unit to coincide with the axis
Solution Approach 1:
The flap retaining unit provides a feedback mechanism where the flap part's expansion is continuously constrained by the retaining structure (retaining groove or protrusion) during operation. This feedback loop ensures that even if the sheath undergoes dimensional changes from repeated use, the flap part's expansion extent is automatically adjusted and limited, maintaining axial alignment between the clip unit and sheath throughout the sheath's service life.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables consistent and reliable positioning of the clip unit, ensuring smooth and precise ligation actions by maintaining the expansion extent of the flap parts, thereby stabilizing the clip unit's posture and facilitating reliable tissue ligation.
Implementation Method 1
the flap parts 305, 305 are elastically biased diametrically outward, so that when the flap parts 305, 305, which have been closed within the sheath, protrude from the sheath 303, the flap parts 305, 305 are expanded diametrically outward
Implementation Method 2
a flap retaining unit configured to retaining an expansion extent of the flap part at a given extent
Data Source
AI summary
A clip unit for ligating a biological body includes: a clip body having a pair of arm parts; and a fastening ring arranged in an outside of the clip body, and configured to fasten the arm parts, in which: the fastening ring includes a flap part configured to expand diametrically outward from the fastening ring, and a flap retaining unit configured to retaining an expansion extent of the flap part at a given extent.