Clip Delivery Device Snap-Fit Mechanism for Secure Tissue Ligation
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Solution Overview
Problem
Conventional clip delivery devices for ligaturing living tissue face issues with insufficient clip closure due to deviating forces and bending moments, leading to incomplete ligation, particularly when the clip arms are pulled into the clip holding member, causing the breakable portion to fail in breaking and resulting in inadequate tissue biting.
Innovation Solution
The introduction of a snap-fit mechanism between the clip and the connecting member, which stabilizes their connection and minimizes relative motion, ensuring a successful breaking force is applied to the breakable portion, thereby enhancing the clip's ability to securely ligate tissue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the clip arms are pulled into the clip holding member during ligation, then the clip closure force is increased, but deviating forces and bending moments are generated causing the breakable portion to fail in breaking
Solution Approach 1:
A guide member is introduced as an intermediary component between the clip arms and the clip holding member. The guide member receives the deviating force when the clip arms are pulled, preventing this force from acting on the breakable portion. The guide member includes a guide passage that guides the clip arms during closure, ensuring that the breaking force is applied substantially perpendicular to the breakable portion, thereby resolving the contradiction between achieving sufficient closure force and ensuring reliable breaking.
2Strength
If the clip arms are pulled into the clip holding member, then the ligation tightness is improved, but bending moments are generated that prevent successful breaking
Solution Approach 1:
The guide member serves as a mediator that absorbs and redirects the bending moment generated during clip arm retraction. By providing a guide passage that constrains the movement path of the clip arms, the guide member prevents the bending moment from being transmitted to the breakable portion, allowing the ligation tightness to be improved without compromising the breaking reliability.
Solution Approach 2:
The guide member is designed to preemptively counteract the bending moment before it can affect the breakable portion. The guide passage is configured to maintain the clip arms in a substantially parallel state during retraction, preventing the generation of bending moments that would otherwise compromise the breaking action.
3Ease of operation
If the clip arms move relative to the connecting member during operation, then the clip can be opened and closed, but deviating forces cause insufficient tissue biting
Solution Approach 1:
The guide member acts as an intermediary that controls and guides the relative movement between the clip arms and the connecting member. The guide passage ensures that the clip arms move in a predetermined path, maintaining parallelism during retraction and preventing deviating forces that would cause insufficient tissue biting. This allows easy operation while ensuring precision in tissue ligation.
Data Source
AI summary
A clip delivery device includes a clip, a first tube configured to store the clip when the clip is closed; a second tube coupled to a proximal end of the first tube; a hook configured to hook a proximal end portion of the clip; a wire coupled to the hook, the wire is configured to pull the hook in a longitudinal direction thereof; an elongated portion coupled to a proximal end of the second tube, the elongated portion having the wire inserted therethrough; and an operating portion coupled to a proximal end of the elongated portion, the operating portion being configured to operate the wire, wherein the hook includes at least one structural mechanism that is configured to suppress rattling that occurs when the proximal end portion of the clip is pulled into the second tube.