Endoscope Scissors Stopper Mechanism
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Solution Overview
Problem
Conventional endoscope scissors lack the ability to restrict the angle of opening, leading to excessive opening or closure, which can result in accidental contact with non-target tissues and increased force requirements, potentially causing damage to the scissors.
Innovation Solution
Incorporating a stopper mechanism at the treatment section that restricts the relative movement of the scissor elements, preventing excessive opening or closure, and ensuring the scissor elements maintain a controlled angle of operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If no stopper mechanism is provided, then the scissor elements can be opened and closed freely, but excessive opening or closure occurs leading to accidental contact with non-target tissues and potential damage to the scissors
Solution Approach 1:
The stopper mechanism is pre-positioned at predetermined locations to automatically restrict the opening and closing movement of the scissor elements. The stoppers are arranged in advance to engage with the scissor elements at specific angles, preventing excessive movement before it can cause harm.
Solution Approach 2:
The stopper acts as an intermediary component between the scissor elements and the operator's control. It mediates the movement by physically blocking excessive opening and closing, thereby preventing accidental contact with non-target tissues while allowing normal surgical manipulation.
2Adaptability or versatility
If the scissor elements can be closed excessively, then the linkage mechanism pins may align with the operation wire, but this requires large force to push in the operation wire or makes it impossible, potentially leading to damage to the scissors
Solution Approach 1:
The stopper mechanism applies preliminary counter-action to prevent the scissor elements from closing beyond the predetermined angle. By engaging the stopper before excessive closure occurs, the mechanism prevents the alignment of linkage pins with the operation wire, thereby avoiding the condition where large force would be required or the scissors could be damaged.
3Measurement precision
If the operator makes fine adjustment of the angle of opening by adjusting the force for advancing or retracting the operation wire, then the scissor elements can be controlled, but this is rather difficult for the operator to cope well with
Solution Approach 1:
The stopper mechanism provides self-service by automatically maintaining the scissor elements at predetermined angles without requiring continuous fine adjustment by the operator. The stoppers engage and disengage based on the movement itself, providing precise angular control passively while allowing the operator to simply advance or retract the operation wire without complex force modulation.
Data Source
Figure 1~2
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Figure 5~6
AI summary
Highly safe scissors for an endoscope is configured in such a manner that the angle of opening of the scissor elements can be restricted and that excessive opening and closure of the scissor elements are suppressed. Scissors (1) for an endoscope includes: a treatment section (5) provided with a pair of scissor elements (10, 11) which are pivotably supported by a pivoting shaft (support pin (13)) and are pivotally displaced between an open position and a closed position; an operation wire (3) connected to the treatment section (5); and an operation section for displacing the scissor elements (10, 11) between the open position and the closed position by advancing and retracting the operation wire (3). A stopper (14) is provided to the treatment section (5). In the open position, the stopper (14) restricts the relative movement between the pair of scissor elements (10, 11) in the opening direction, and in the closed position, the stopper (14) restricts the relative movement between the pair of scissor elements (10, 11) in the closing direction.