Hemostatic Clip Capsule Deployment for Endoscopic Safety
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Solution Overview
Problem
Existing endoscopic hemostatic clipping devices are limited by the dimensions of the working channels of endoscopes, restricting their ability to effectively deploy and secure hemostatic clips in deep body locations, and often expose the working channel to sharp edges of the clip deployment device.
Innovation Solution
A flexible, elongate member with a control wire and capsule system that deploys a single piece hemostatic clip with a frangible link, allowing the clip to be opened and closed multiple times before being locked in place using a shear pin mechanism, which separates from the control wire when a predetermined tension is reached, ensuring secure tissue gripping and easy withdrawal of the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a conventional clip deployment device is used to reach deep body locations, then the device can be inserted through the endoscope working channel, but the device dimensions are limited by the working channel dimensions and sharp edges expose the working channel
Solution Approach 1:
The clip is nested within the capsule for storage and transport, allowing the sharp-edged clip to be contained without exposing it to the working channel. The capsule acts as a protective container that can be inserted through the endoscope working channel, while the clip remains hidden until deployment at the target location
Solution Approach 2:
The clip is extracted from the capsule only when needed at the target tissue location. The frangible link mechanism allows the clip to be released from the control wire after deployment, separating the sharp-edged clip from the delivery system and leaving it securely attached to the tissue
2Reliability
If a frangible link mechanism is used to separate the clip from the control wire, then the clip can be deployed and locked in place, but the device complexity increases
Solution Approach 1:
The frangible link is designed with specific material properties and geometric features that cause it to fail at a predetermined tension level. The link includes a reduced cross-section or notched feature that creates a stress concentration point, ensuring predictable failure when the clip is pulled onto the tissue, thereby locking it in place
3Reliability
If the clip is allowed to open and close multiple times before locking, then secure tissue gripping is achieved, but the deployment time increases
Solution Approach 1:
The clip is designed to be dynamically adjustable during deployment, allowing it to open and close multiple times as it is pulled onto the tissue through the working channel. The frangible link remains intact during this process, enabling the clip to be positioned and secured to the tissue before final locking occurs
Data Source
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AI summary
A tissue clipping apparatus, comprising a flexible insertion member extending from a proximal end portion to a distal end portion, wherein the proximal end portion during use remains outside a body accessible to a user and the distal end portion is inserted into the body, a clip including a first and a second clip arm, each clip arm having a tab at its proximal end portion, a capsule, the capsule receiving a proximal portion of the clip and comprising first windows configured to be engaged by the tabs for locking the clip close, a bushing provided at the distal end portion of the flexible insertion member, wherein the capsule is maintained in engagement with the bushing by a retainer before release, wherein the retainer comprises two spring arms, each of which engages a corresponding second window of the capsule, and a control wire extending through the flexible insertion member.