Hemostatic clip with interference-fit decoupling mechanism
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Solution Overview
Problem
Existing hemostatic clips pose a risk of broken components remaining in the patient's body, which can cause inflammation, and their fabrication is complex due to the use of hooks or yokes for coupling with traction mechanisms.
Innovation Solution
A hemostatic clip with a traction device and a clamping device featuring a constricting sleeve and a clip head assembly, where the clip head assembly can be switched between open and closed configurations using a separation mechanism, allowing for a pulling force to disengage the clip head assembly from the traction mechanism without breaking any components, thus avoiding the risk of parts remaining in the body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the clip head is coupled to the traction mechanism by a hook and decoupled by breaking the hook, then the coupling and decoupling process is simple, but broken portions may remain in the patient's body causing inflammation
Solution Approach 1:
The engagement member is segmented into a proximal end portion that forms an interference fit with the traction mechanism's inner bore and a distal end portion that engages with the clip arm. This segmentation allows the proximal end portion to be selectively disengaged by applying a pulling force greater than a predetermined value, enabling complete separation without breaking any components.
Solution Approach 2:
The interference fit between the engagement member's proximal end portion and the inner bore is designed with specific dimensional parameters that allow it to maintain a secure connection during normal operation but can be disengaged when a pulling force exceeding a predetermined threshold is applied. This parameter-based design enables controlled decoupling without component failure.
2Reliability
If the connecting yoke is used to couple the clip head to the traction mechanism and decoupled by deformation, then the coupling mechanism is reliable, but the fabrication process becomes complicated
Solution Approach 1:
The engagement member is divided into functional segments: a proximal end portion for interference fit with the traction mechanism and a distal end portion for engagement with the clip arm. This segmentation simplifies fabrication compared to a complex deforming yoke structure while maintaining reliable coupling and controlled decoupling capabilities.
Solution Approach 2:
The engagement member extracts the decoupling function from the main body structure, allowing the proximal end portion to be selectively disengaged from the inner bore through a simple pulling action, eliminating the need for complex yoke deformation mechanisms.
3Ease of operation
If the clip head assembly is allowed to move freely along the constricting sleeve, then the operation flexibility is improved, but the structure becomes more complex requiring additional limiting mechanisms
Solution Approach 1:
The first limiting member is integrated into the constricting sleeve structure, combining the limiting function with the existing sleeve rather than adding separate complex limiting mechanisms. This integration maintains operation flexibility while minimizing structural complexity.
Solution Approach 2:
The constricting sleeve serves multiple functions: it provides structural support, guides the clip head assembly movement, and incorporates the first limiting member to define movement boundaries. This multi-functionality reduces the need for additional dedicated limiting components.
Data Source
AI summary
A hemostatic clip includes a traction device, a clamping device and a first limiting member. The traction device includes a traction mechanism and a separation mechanism. The clamping device includes a constricting sleeve and a clip head assembly. A proximal end portions of the clip head assembly is inserted in an inner bore of the traction mechanism in an interference-fit manner. The separation mechanism prevents a second locking member of the clip head assembly from being connected to a first locking member of the constricting sleeve, thereby allowing the traction mechanism to drive, under the action of an external force, the clip head assembly to move along an axis of the constricting sleeve. The clip head assembly can be separated from the traction mechanism simply by providing an external force that can overcome the interference fit between the two.