Reduced-Length Hemostasis Clip Deployment With Detachable Yoke
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Solution Overview
Problem
Endoscopic procedures for gastrointestinal tract treatment face challenges with existing hemostasis clips that require multiple clips due to large defects, risking perforation and requiring improved closure mechanisms.
Innovation Solution
A clipping device with a shortened deployment mechanism featuring a yoke that separates from the clip during deployment, allowing for a reduced length clip to be deployed and ensuring no parts are left in the body, enhancing maneuverability and visualization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional hemostasis clip deployment mechanism is used, then the clip can effectively close gastrointestinal defects, but the deployment mechanism is long and complex, requiring multiple clips for large defects and increasing the risk of perforation
Solution Approach 1:
The deployment mechanism is segmented into distinct functional components: a yoke that couples to the control member, a capsule containing the clip arms, and a tension member. The yoke is designed to separate from the capsule during deployment, with each segment performing a specific function. This segmentation allows for a more compact overall structure while maintaining full functionality, reducing the length and complexity of the deployment mechanism.
Solution Approach 2:
The yoke is extracted as a separate, detachable component from the capsule assembly. The yoke couples to the control member during delivery but is designed to separate and remain outside the body after clip deployment. This extraction eliminates the need for a long, continuous deployment mechanism extending into the gastrointestinal tract, improving maneuverability and visualization.
2Reliability
If multiple hemostasis clips are deployed to cover large defects, then adequate closure is achieved, but the number of clips increases the risk of perforation and procedural complexity
Solution Approach 1:
The clip arms are designed with dynamic movement capabilities, allowing them to transition from a compressed delivery state to a fully opened deployed state. The tension member provides elastic force to drive this dynamic opening motion, enabling a single clip to span and secure larger defects that would traditionally require multiple static clips, thereby reducing perforation risk.
3Ease of operation
If a shortened deployment mechanism is used, then maneuverability and visualization are improved, but the mechanism must ensure no parts are left in the body
Solution Approach 1:
The yoke is designed as a temporary coupling structure that performs its function during deployment and then safely separates. The separation mechanism ensures the yoke detaches from the capsule and remains outside the body, while the capsule with the deployed clip remains in place. This design copies the function of a long deployment mechanism during delivery but eliminates the need for it to remain in the body, ensuring complete part retrieval while maintaining improved visualization.
Solution Approach 2:
The yoke is designed as a disposable component that is discarded outside the body after serving its coupling function. The separation mechanism ensures clean detachment of the yoke from the capsule, allowing the yoke to be recovered (removed) from the procedural field while the functional clip remains deployed. This discarding approach ensures no parts are left in the body while maintaining the benefits of a shortened mechanism.
Data Source
AI summary
A clipping device includes a clip including a capsule and a pair of clip arms movable between an open configuration and a closed configuration. A tension member includes a distal portion and a proximal portion, a pair of protrusions extending from opposing surfaces of the proximal portion to be received within openings extending through proximal ends of the clip arms, the proximal portion including a relief to define a pair of fingers separated from one another at proximal ends thereof. A yoke including a central portion including a recess formed at a distal end thereof, the recess sized and shaped to releasably receive the pair of fingers of the tension member, the pair of fingers configured to flex toward one another when a predetermined force is exerted thereon to release the pair of fingers from the recess and disengage the tension member from the yoke during deployment of the clip.