Endoscopic Tool Dual Locking Mechanism for Needle Retraction
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Solution Overview
Problem
Existing endoscopic puncture devices face challenges in reliably accommodating and preventing the protrusion of puncture needles within the treatment tool channel, particularly due to issues with locking mechanisms and external forces affecting the needle's position relative to the sheath.
Innovation Solution
The endoscopic treatment tool incorporates a dual locking mechanism system, including a first locking mechanism that provides a click feedback for needle accommodation and a second locking mechanism with greater force to restrict slider advancement, along with a fixing mechanism and restricting portion to ensure the puncture needle remains within the sheath, even under external influences like bending or manufacturing errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single locking mechanism is used to accommodate the puncture needle in the sheath, then the structure is simple, but the reliability is insufficient under external forces
Solution Approach 1:
The locking mechanism is divided into two independent parts: a first locking mechanism that locks the slider when the needle is accommodated, and a second locking mechanism that locks the slider in an advanced state. This segmentation allows each mechanism to perform its specific function, improving overall reliability without requiring a single complex mechanism
Solution Approach 2:
The second locking mechanism is nested within the structure of the first locking mechanism, with the fixing mechanism of the second locking mechanism sliding along the manipulation main body. This nested design allows both locking mechanisms to coexist in a compact arrangement, improving reliability while minimizing additional complexity
2Object-affected harmful factors
If the slider is allowed to advance freely, then the operation is easy, but the needle may protrude from the sheath causing damage
Solution Approach 1:
The second locking mechanism is positioned to abut the slider and prevent its advance before the needle can protrude from the sheath. This preliminary anti-action counteracts any external forces that might cause the needle to protrude, protecting the channel while still allowing the operator to manipulate the slider freely within the permitted range
Solution Approach 2:
The second locking mechanism acts as an intermediary between the slider and the sheath, physically blocking the slider's advance and thereby preventing the needle from protruding. This intermediary structure protects the channel from damage while maintaining ease of operation for valid manipulations
3Adaptability or versatility
If the second locking mechanism is fixed at all positions, then the needle position is always controlled, but the adaptability to different operational states is reduced
Solution Approach 1:
The second locking mechanism is designed to be movable along the manipulation main body rather than fixed at a single position. The fixing mechanism allows the operator to dynamically position and fix the second locking mechanism at different locations, providing adaptability to different operational states while maintaining a relatively simple structure through the use of a sliding fixing mechanism
Data Source
AI summary
An endoscopic treatment tool includes a sheath; a treatment portion capable of protruding and retracting from a distal end of the sheath; a manipulation main body; a slider which advances and retracts in a longitudinal axis direction to cause the treatment portion to protrude and retract from the sheath; a first locking mechanism which locks the slider at a position at which the distal end of the treatment portion is accommodated in the sheath in accordance with a retracting manipulation of the slider; a second locking mechanism provided at further distal side than the first locking mechanism and restricts advance of the slider by being locked to the manipulation main body; a fixing mechanism provided in the second locking mechanism and fixed to the manipulation main body by sliding; and a restricting portion which restricts fixing of the fixing mechanism to the manipulation main body.