Clip Device Stoppers for Tissue Ligation Control
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Solution Overview
Problem
Existing clip devices for ligating tissue in the body face challenges in efficiently and reliably closing the clip around the tissue, particularly in maintaining the position of the second arm part relative to the tissue during the ligation process, leading to difficulties in pinching and securing the tissue effectively.
Innovation Solution
The clip device incorporates a restraining tube with first and second arm parts that are advanced and retreated using an operation wire, featuring stoppers and transmitting members to control the movement of the arm parts, allowing for independent and coordinated motion to securely grasp and close around the tissue, with the second arm part being adjusted to maintain its position relative to the tissue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the second arm part is allowed to move freely during ligation, then the operation is more flexible, but the position control relative to tissue deteriorates
Solution Approach 1:
The second arm part is designed to be movable during the ligation process, allowing dynamic adjustment. The arm can move freely during tissue engagement but is constrained to maintain proper position during the closing phase, achieving both operational flexibility and position control through staged mechanical constraints
Solution Approach 2:
The stopper mechanism is pre-configured to automatically engage and constrain the second arm part at the appropriate moment during the ligation sequence. This preliminary positioning ensures that when the closing force is applied, the arm maintains the correct position relative to the tissue without requiring active control
2Manufacturing precision
If stoppers are added to control arm movement, then position control improves, but device complexity increases
Solution Approach 1:
The control mechanism is segmented into separate stoppers for each arm part, with each stopper independently controlling the movement of its corresponding arm. This modular approach allows precise control of each arm's position while keeping the overall device structure manageable and easier to manufacture
Solution Approach 2:
The stoppers act as intermediary elements between the operation wire and the arm parts. They translate the pulling force on the operation wire into controlled movement of the arm parts, providing precise position control without requiring complex direct coupling mechanisms
3Adaptability or versatility
If the first arm part moves independently before closing, then grasping ability improves, but coordination control becomes difficult
Solution Approach 1:
The first arm part is designed with dynamic movement capability, allowing it to move independently during the tissue engagement phase to adapt to different tissue positions and shapes. The stopper mechanism then coordinates both arms during the closing phase, providing both adaptability and coordination through staged mechanical control
Data Source
AI summary
A clip device includes a restraining tube having an insertion passage with a first arm part and a second arm part facing each other and disposed within the insertion passage and configured to protrude from the restraining tube. The clip device further includes an operation wire configured to move the first arm part. A first stopper is engaged to the first arm part and a second stopper is engaged to the second arm part. The first stopper is disposed in a region closer to a distal end of the restraining tube than the second stopper. The first stopper is configured to, in response to the operation wire moving from the distal end of the restraining tube to a proximal end of the restraining tube, move relative to the second stopper, contact the second stopper, and move in contact with the second stopper.