Endoscopic Clip Body Rotation Control via Manipulation Wire
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional endoscopic surgical devices lack the ability to easily adjust the direction in which the target tissue is grasped by the clip, limiting precision and manipulability during ligation and hemostasis procedures.
Innovation Solution
An endoscopic surgical device with a clip body that is initially nonrotatable around the longitudinal axis, but becomes rotatable when the manipulation wire is advanced against a biasing force, allowing for adjustable opening and closing of the clip arms, and a holding tube that locks onto the clip body to facilitate precise tissue grasping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the clip body is made rotatable around the longitudinal axis, then the direction of tissue grasping can be adjusted, but the clip body may rotate unintentionally during ligation
Solution Approach 1:
The clip body's rotational capability is made dynamic rather than static. It is locked in the initial state to prevent unintended rotation, and becomes rotatable only when the manipulation wire is advanced by a prescribed amount against the biasing force, allowing directional adjustment when needed.
Solution Approach 2:
The rotational parameter of the clip body is changed from fixed to variable. By advancing the manipulation wire against the biasing force, the system transitions from a nonrotatable state to a rotatable state, enabling control over the clip's opening-closing direction.
2Ease of operation
If the manipulation wire is made advanceable against biasing force, then rotation control is achieved, but the device complexity increases
Solution Approach 1:
The biasing member is disposed within the sheath, and the manipulation wire passes through it. The convex portion on the manipulation wire interacts with the tubular member containing the biasing member, creating a compact nested structure that achieves rotation control without adding external complexity.
Solution Approach 2:
The biasing member automatically holds the manipulation wire at the initial position and provides the force needed to return the wire to the initial position after advancement. This self-service mechanism reduces the need for additional control systems.
3Reliability
If the holding tube locks onto the clip body, then rotation is stabilized, but the ease of manipulation is reduced
Solution Approach 1:
The locking between the holding tube and clip body is dynamic. When the clip body is rotatable, the holding tube locks onto it to stabilize rotation. When the clip body returns to the initial position, the locking is released, restoring full manipulability.
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 easy adjustment of the clip body's direction and state between rotatable and nonrotatable positions, enhancing manipulability and preventing unintended rotation during tissue ligation, thereby improving the precision and effectiveness of endoscopic procedures.
Implementation Method 1
a biasing member configured to hold a position of the manipulation wire at an initial position
Implementation Method 2
When the manipulation wire is advanced by a prescribed amount against a biasing force of the biasing member, the clip body is rotatable around the longitudinal axis
Data Source
AI summary
An endoscopic surgical device that includes: a sheath; a manipulator; a manipulation wire; a clip body having a pair of arms, connected to a distal end of the manipulation wire, and configured to be capable of advancing and retracting in accordance with manipulation of the manipulator along with a longitudinal axis of the manipulation wire; a holding tube into which a proximal portion of the clip body is inserted to be capable of advancing and retracting; and a biasing member configured to hold a position of the manipulation wire at an initial position. The clip body is nonrotatable around the longitudinal axis at the initial position. When the manipulation wire is advanced a prescribed amount against a biasing force of the biasing member, the clip body is rotatable around the longitudinal axis, and is allowed adjustment of an opening-closing direction of the pair of arms.