Self-Expanding Clip Connection With Controlled Hook Protrusion
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Solution Overview
Problem
Medical clips with self-expanding forces can become unstable or disconnect from the hook due to the self-expanding force, leading to unreliable connections in medical clip cartridges.
Innovation Solution
A clip device with a switching mechanism that includes a connection member, a pressing tube, and a power transmission member, allowing for stable attachment and detachment of the arm portion to the hook through a regulation member that prevents the hook from protruding, maintaining a secure connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a clip having self-expanding force is used in the medical clip cartridge, then the clip can be returned to the open state for re-grasping the resection portion, but the hook connected to the clip may protrude from the distal end of the catheter tube due to the self-expanding force, causing unstable connection or disconnection
Solution Approach 1:
The distal end of the catheter tube is configured with a preventive structure that counteracts the self-expanding force of the clip before it can cause the hook to protrude. This preliminary counter-action prevents the harmful effect (hook protrusion) while allowing the beneficial effect (re-grasping capability) to occur.
Solution Approach 2:
The distal end of the catheter tube acts as an intermediary element between the clip's self-expanding force and the hook connection. It mediates the interaction by providing a controlled interface that allows the clip to expand for re-grasping while preventing uncontrolled hook protrusion that would cause disconnection.
2Adaptability or versatility
If the hook is allowed to protrude from the distal end of the catheter tube to enable connection with the clip, then the clip can be attached, but the self-expanding force may cause the hook to protrude excessively, leading to unstable or disconnected connection
Solution Approach 1:
The distal end of the catheter tube is designed with specific geometric parameters (such as opening size, shape, and positioning) that change to accommodate the clip's self-expanding force. These parameter changes allow controlled hook protrusion for attachment while preventing excessive protrusion that would compromise connection stability.
Solution Approach 2:
The distal end of the catheter tube incorporates dynamic characteristics that adapt to the clip's self-expanding force. The structure allows controlled movement and adjustment during the attachment process, enabling the hook to protrude appropriately for connection while maintaining stability through dynamic equilibrium with the self-expanding force.
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
The clip device ensures stable refilling and re-grasping of self-expanding clips, preventing unstable connections and disconnections, facilitating reliable operation during endoscopic procedures.
Implementation Method 1
an arm portion (20) including a plurality of arms (21, 22) that are openable and closable
Data Source
AI summary
A clip device includes an arm portion including a plurality of arms that are biased to an open state; a pressing tube into which a proximal-end portion of the arm portion is accommodated and configured to be able to lock the arm portion in a closed state; an insertion portion connected to a proximal-end opening of the pressing tube at a distal end of the insertion portion; a power transmission member extending through the insertion portion; a link configured to detachably connect a distal-end portion of the power transmission member and a proximal-end portion of the arm portion; a first stopper configured to regulate the distal-end portion of the power transmission member from protruding from a distal-end opening of the pressing tube, and a switching portion configured to switch the clip device between a first state and a second state.