Endoscopic Clip Device Preventing Engaging Portion Deformation
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Solution Overview
Problem
Existing endoscopic treatment devices face challenges in securely locking and releasing the clip unit after ligation, often resulting in difficulty in re-grasping tissues and potential deformation of the engaging portion, which can lead to unintended release of the connection between the applicator and the clip unit.
Innovation Solution
The design incorporates a clip unit with sliding grooves, an intermediate member, a pressing tube, and a connection member with an engaging portion and contact portion to prevent deformation, allowing for secure locking and easy release by utilizing a snap-fit hole and a protrusion portion to prevent accidental engagement after the clip is locked.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the operation wire is pulled to draw the proximal end portions of the pair of arms outside of the pressing tube, then the pair of arms are locked in a closed state, but the engaging portion may deform during the sliding process causing unintended release
Solution Approach 1:
A guide groove is provided in the pressing tube through which the proximal end portions of the arms slide during the locking process. This guide groove acts as an intermediary structure that guides and constrains the movement path of the arms, preventing lateral displacement and deformation of the engaging portion while enabling smooth transition to the locked state.
2Reliability
If the pair of arms are firmly tightened and locked, then secure ligation is achieved, but re-grasping tissues becomes difficult
Solution Approach 1:
The clip unit employs a dynamic locking mechanism where the pair of arms can transition between locked and unlocked states. A release mechanism is provided that, when actuated, causes the arms to move from their locked position back to an open position, enabling re-grasping of tissues while maintaining secure ligation during the locked state.
Solution Approach 2:
The design incorporates a release mechanism that can be actuated to automatically open the locked arms. This preliminary preparation of the release mechanism allows for easy reversal of the locking action, enabling re-grasping when needed while maintaining firm ligation during the locked state.
3Ease of operation
If the connection member allows easy engagement and disengagement, then operation simplicity is improved, but accidental release may occur
Solution Approach 1:
A snap-fit hole and protrusion portion are provided to create a positive locking engagement between the connection member and the arms. This preliminary anti-action mechanism prevents accidental disengagement by requiring a deliberate releasing action to overcome the snap-fit engagement, while still allowing simple controlled engagement and disengagement when intended.
Data Source
AI summary
A clip device includes a clip, including a plurality of arms having sliding grooves; and an intermediate member inserted into the sliding grooves for connecting the plurality of arms; a pressing tube accommodating a proximal end portion of the clip; a connection member connecting with an operation wire at a proximal end side and including an engaging portion engaging with the intermediate member; and a locking mechanism for lock the plurality of arms when the clip is pulled toward the proximal end side by a predetermined distance by the connection member, wherein the clip includes a contact portion formed on a side surface of the arm to be in contact with the engaging portion from a direction orthogonal to an axial direction of the intermediate portion for preventing a deformation of the engaging portion when the intermediate portion slides along the sliding groove before the plurality of arms are locked.