Clip Delivery Device With Dynamic Hook Release for Reuse
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing clip delivery systems for endoscopic treatments face challenges in efficiently reloading and securely attaching clips to tissues, particularly in maintaining the closed state of the clip after deployment and ensuring easy detachment for re-use.
Innovation Solution
A clip delivery device with a sheath, wire, and clip unit featuring a movable hook mechanism that transitions between engaged and disengaged positions, along with an elastic deformation portion, allowing for secure clip attachment, closure, and re-opening for re-use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hook mechanism is used to attach the clip to the sheath, then the clip can be securely held during delivery, but the complexity of the device increases due to the additional moving parts required for attachment and detachment
Solution Approach 1:
The hook is designed as a movable component that can dynamically transition between an engaged position (where it hooks onto the convex portion of the tube to secure the clip) and a disengaged position (where it releases the convex portion to allow detachment). This dynamic capability enables secure attachment during delivery while maintaining the potential for easy release, resolving the contradiction between reliability and complexity by making the connection state changeable rather than fixed
Solution Approach 2:
The connection mechanism is segmented into distinct functional components: the hook as a separate movable element, the convex portion on the tube as a fixed engagement feature, and the wire as the actuating element. This segmentation allows each component to perform its specific function independently, making the overall system more manageable and easier to operate despite the added complexity of the attachment mechanism
2Reliability
If the hook is positioned at a greater radial distance from the central axis, then the engagement with the convex portion is more secure, but the space required within the sheath increases
Solution Approach 1:
The hook's radial position is dynamic rather than fixed. During engagement, the hook extends to a greater radial distance from the central axis to securely hook onto the convex portion of the tube. When detachment is needed, the hook retracts to a smaller radial distance. This dynamic radial positioning allows the system to achieve secure engagement when needed while minimizing the space occupied during storage or non-engagement states, effectively resolving the contradiction between engagement security and space requirements
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 reliable clip attachment and detachment, facilitating repeated use and ensuring the clip remains securely closed on tissues during endoscopic procedures.
Implementation Method 1
The deformation portion is elastically deformable. When the wire is moved proximal to the sheath, the deformation portion is elastically deformed to decrease a diameter of the distal-end portion of the connector.
Data Source
AI summary
Clip delivery device has a sheath, a wire inserted into the sheath, and a clip detachably connected to the wire and having arms movable between an open position and a closed position. A tube is adjacent the sheath along a longitudinal axis and contains at least part of the clip and has a convex portion on an inner surface. A connector provided in the sheath has a hook detachably connected with the convex portion. The hook is movable between a first position, in which the hook engages the convex portion and is at a first radial distance from a central axis of the sheath, and a second position, in which the hook is disengaged from the convex portion and is at a second radial distance from the central axis of the sheath, where the first radial distance is greater than the second radial distance, by moving the wire.