Hemostasis Clip Single-Stage Deployment via Frangible Link
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Solution Overview
Problem
Existing endoscopic clipping devices require multiple stages for deploying hemostatic clips, which can be cumbersome and inefficient, especially in accessing and securing tissue within the body for hemostasis.
Innovation Solution
A single-stage deployment device featuring a clip with arms biased to an open configuration, a core member with a frangible link that breaks under predetermined tension, and a capsule that moves the arms into a closed configuration for tissue gripping, allowing for efficient and direct placement of clips within the body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple stages are used for deploying hemostatic clips, then the deployment process is more controlled and reliable, but the procedure becomes cumbersome and inefficient
Solution Approach 1:
The patent combines multiple deployment stages into a single integrated mechanism. The capsule houses both the clip and core member, and a single actuation simultaneously releases the frangible link, deploys the clip arms, and positions the tissue between the arms, achieving what previously required multiple separate steps in one coordinated action
Solution Approach 2:
The clip arms are pre-biased toward the closed configuration and the core member is pre-positioned within the capsule. When deployed, the frangible link breaks and the pre-stored elastic energy in the biased arms immediately closes them around the tissue, eliminating the need for gradual or multi-stage deployment while maintaining controlled action
2Productivity
If a single-stage deployment device is used, then the deployment efficiency is improved, but the device complexity increases
Solution Approach 1:
The device employs a nested structure where the core member is housed within the capsule, and the clip arms are positioned around the core member. The capsule itself is designed to be inserted through the endoscope working channel. This nesting allows multiple functional components to be compactly integrated into a single deployable unit that can be delivered through standard endoscopic access
Solution Approach 2:
The frangible link is designed to break automatically when the clip is drawn into the capsule, triggering the deployment sequence without requiring additional actuation. The biased arms self-close around the tissue once released, and the capsule withdrawal automatically completes the deployment, allowing the device to perform multiple actions through a single initial motion
3Force
If the clip arms are biased toward closed configuration, then the tissue gripping force is improved, but the ease of tissue placement becomes more difficult
Solution Approach 1:
The clip arms are pre-biased toward the closed configuration, storing elastic energy that is released upon deployment. The frangible link holds this energy in check during delivery, and when it breaks, the pre-stored force immediately engages the tissue with full gripping strength, eliminating the need for gradual force application or adjustment after placement
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
Enables rapid and effective deployment of hemostatic clips in a single stage, facilitating efficient tissue gripping and hemostasis, with the ability to repeatedly move between open and closed configurations as needed for secure wound closure.
Implementation Method 1
a core member including a proximal portion and a distal portion connected to one another via a frangible link configured to break when subjected to a predetermined tension
Implementation Method 2
contact between the arms and the capsule move the arms toward one another into a closed, tissue-gripping configuration
Data Source
AI summary
A device for clipping tissue includes a clip including first and second arms coupled to one another and biased toward an open configuration and a core member including a proximal portion and a distal portion connected to one another via a frangible link configured to break when subjected to a predetermined tension, the distal end of the core member being directly coupled to the first arm. The device further includes a capsule slidably housing the distal end of the core member and a proximal portion of the clip, the capsule being dimensioned so that, when the clip is drawn proximally thereinto, contact between the arms and the capsule move the arms toward one another into a closed, tissue-gripping configuration, the core member and the capsule being longitudinally movable relative to one another to move the clip between and a closed tissue-gripping configuration and the open configuration.