Clip Ligation Applicator With Deformable Guide Pipe for Easy Release
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Solution Overview
Problem
Existing ligation devices using indwelling clips face challenges in maintaining a force gap between locking and releasing forces, leading to difficult operations and unclear release recognition, especially when dealing with rigid tissues.
Innovation Solution
A ligation device with a clip unit and applicator design that includes a connector and a guide pipe with varying inner diameters, allowing for controlled release through deformation of the guide pipe to facilitate easy separation of the clip unit from the applicator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the releasing force is set based on the locking force for rigid tissues, then the connection can be reliably released, but the releasing force becomes significantly large making operation difficult
Solution Approach 1:
The guide pipe's inner diameter changes from a first diameter (smaller than connector outer diameter) to a second diameter (larger than connector outer diameter) through deformation. This parameter change allows the connector to be inserted during locking operations but removed easily during release, resolving the contradiction between reliable connection and easy operation
Solution Approach 2:
The guide pipe transitions from a rigid state with small inner diameter to a flexible/deformed state with large inner diameter. This dynamic change in structure enables the system to maintain secure connection during locking while allowing easy removal during release without requiring large releasing forces
2Reliability
If the operating force increases after connection release to maintain force gap, then ligation security is improved, but the operator cannot recognize release and unnecessary operations continue
Solution Approach 1:
The operator can recognize connection release through tactile feedback when the connector is removed from the guide pipe. The force transmission member shows a noticeable change in operation feel, providing clear feedback that the connection has been released, preventing unnecessary operations
3Stability of the object's composition
If the guide pipe inner diameter is small to secure connector connection, then connection stability is improved, but the connector cannot be removed for ligation operation
Solution Approach 1:
The guide pipe's inner diameter dynamically changes based on operational needs. During insertion and locking operations, the small inner diameter provides stable connection. During release operations, the guide pipe deforms to enlarge the inner diameter, allowing easy connector removal. This dynamic adaptation resolves the contradiction between connection stability and removability
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
Ensures reliable ligation of tissues, including rigid ones, with reduced operational force and clear indication of release, simplifying the procedure and maintaining a consistent force gap for secure ligation.
Implementation Method 1
an inner diameter of the opening (first diameter) when the connector and the clip device are connected with each other, and the inner diameter of the opening increases to a second diameter, which is larger than the first diameter, when the connector and the clip device are disconnected from each other
Data Source
AI summary
A ligation device that includes a clip device including an openable arm, a connector connected to the clip device and is able to be released from the connector, a wire connected to the connector and configured to operate the clip device, and a pipe including an opening into which the wire is inserted. An inner diameter of the opening is smaller than a dimension in a diameter direction of the connector in a first state in which the connector and the clip device are connected with each other, and the inner diameter of the opening decreases towards a proximal end side of the pipe and is larger than the dimension of the connector in a second state in which the connector and the clip device are unconnected with each other.