Driving Switching Mechanism for Surgical Stapling Instrument
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Solution Overview
Problem
Existing surgical stapling instruments with a single handle require complex transmission mechanisms, making manufacturing difficult and prone to assembly errors, which complicates the execution of stapling operations.
Innovation Solution
A driving switching mechanism for a stapling instrument featuring an actuation driving assembly and a handle driving assembly, including a driving sleeve, knife bar driving rod, and a switching control member, allows for simple linkage coordination to perform gripping and stapling actions using a single handle without active position switching, utilizing a knife driving member with switchable positions and a second elastic reset member for stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single handle is used to effect repeated operations of the end effector, then the ease of operation is improved, but the device complexity increases due to the large number of complex transmission mechanisms required
Solution Approach 1:
The patent extracts the knife driving function from the main handle driving mechanism by introducing a separate knife bar driving assembly. This assembly includes a knife bar driving rod that can independently engage with the driving sleeve, separating the stapling function from the cutting function and simplifying the overall transmission mechanism while maintaining ease of operation
Solution Approach 2:
The patent introduces a knife driving member as an intermediary component between the handle driving portion and the knife bar driving rod. This mediator enables selective engagement and disengagement of the knife driving function, allowing the single handle to control multiple operations without requiring complex simultaneous transmission mechanisms
2Adaptability or versatility
If complex transmission mechanisms are used to achieve multiple operations, then the adaptability is improved, but the manufacturing difficulty increases and assembly errors tend to occur
Solution Approach 1:
The patent segments the driving mechanism into distinct functional modules: a driving sleeve for stapling operations, a knife bar driving assembly for cutting operations, and a handle driving assembly that coordinates both. Each module has a clear, simple structure that is easy to manufacture and assemble, while the overall system maintains high adaptability through the coordinated action of these segments
Solution Approach 2:
The patent employs dynamic engagement and disengagement mechanisms where the knife driving member can selectively engage with the knife bar driving rod based on the operational phase. This dynamic configuration allows the system to adapt between stapling and cutting functions without requiring permanently complex transmission paths, simplifying manufacturing and assembly
3Productivity
If the knife driving member is always engaged, then the productivity is improved, but the reliability decreases due to potential interference and loosening
Solution Approach 1:
The knife driving member is designed to dynamically engage with the knife bar driving rod during cutting operations and disengage during stapling operations. This dynamic engagement ensures the knife driving function is active only when needed, preventing interference and loosening while maintaining productivity through rapid, reliable engagement when cutting is required
Solution Approach 2:
The system incorporates feedback through the mechanical interaction between the driving sleeve and knife driving member. The position and state of the driving sleeve automatically control the engagement of the knife driving member, ensuring it is engaged only during appropriate operational phases. This feedback mechanism prevents premature or inappropriate engagement that could cause interference or loosening
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
This solution enables efficient and stable operation of stapling instruments by simplifying the linkage coordination, ensuring successful gripping and stapling without loosening, and effectively utilizing space within the handle housing to prevent interference, thus improving the reliability and ease of use.
Implementation Method 1
the driving handle and the handle housing are provided with a first elastic reset member
Data Source
AI summary
This application provides a driving switching mechanism for a stapling instrument. An actuation driving assembly includes a driving sleeve for driving an end effector to perform a closing action and a knife bar driving rod for driving the end effector to perform a stapling action. A handle driving assembly includes a driving handle and a knife bar driving assembly which includes a knife driving member and a handle driving connecting member. The handle driving connecting member is connected to a handle driving portion. The knife driving member is movably connected to the handle driving connecting member, and is movable relative to the handle driving connecting member to a driving position or a driving disengagement position. When the knife driving member is in the driving position, the knife driving member and the knife bar driving rod are engaged as the handle driving portion moves toward a second position.