Rotatable Knife Bar in Surgical Stapling Device
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Solution Overview
Problem
Linear endoscopic surgical stapling devices often experience deflection of the staple cartridge and anvil assemblies during firing, which can negatively impact staple formation, especially in devices without a knife bar to minimize this deflection.
Innovation Solution
The surgical stapling device incorporates a tool assembly with a knife bar assembly that is rotatable between engaged and disengaged positions, coupled with a drive assembly and a locking member to secure the anvil and cartridge assemblies, maintaining a maximum tissue gap and improving staple formation by allowing the device to operate in both cutting and non-cutting modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a knife bar is provided to minimize deflection of the anvil and cartridge assemblies during firing, then staple formation quality is improved, but device complexity increases
Solution Approach 1:
The knife bar assembly is made rotatable between engaged and disengaged positions, allowing the system to dynamically adjust its configuration. When engaged, the knife bar provides structural support to minimize deflection and improve staple formation. When disengaged, the complexity is reduced for non-cutting operations. This dynamic reconfiguration resolves the contradiction by allowing the system to have high precision when needed while maintaining operational simplicity otherwise.
2Stability of the object's composition
If the knife bar assembly is engaged to minimize deflection, then stability of the anvil and cartridge assemblies is improved, but the device cannot operate in non-cutting modes, reducing versatility
Solution Approach 1:
The rotatable knife bar assembly enables the device to switch between engaged and disengaged states, providing stability when cutting is required while allowing versatile operation in both cutting and non-cutting modes. The rotational mechanism allows the knife bar to be positioned optimally for each operational mode.
Solution Approach 2:
The knife bar assembly serves multiple functions: it provides structural support to minimize deflection during firing, enables cutting operations when engaged, and can be disengaged to allow non-cutting stapling operations. This multi-functionality resolves the contradiction by making the device adaptable to different surgical requirements while maintaining stability when needed.
3Adaptability or versatility
If the knife bar assembly is made rotatable between engaged and disengaged positions, then versatility is improved, but device complexity increases
Solution Approach 1:
The rotational mechanism allows the knife bar assembly to switch between engaged and disengaged positions, enabling the device to perform both cutting and non-cutting operations. This dynamic capability provides versatility without requiring multiple separate devices, as the same assembly can be reconfigured for different functions.
Solution Approach 2:
The knife bar assembly combines multiple functions into a single integrated component: it serves as both a cutting element and a structural support element. By merging these functions into one rotatable assembly, the device achieves versatility while minimizing the number of separate components, thereby reducing overall complexity compared to having separate cutting and support mechanisms.
Data Source
AI summary
A surgical stapling device includes a drive assembly and a knife bar assembly that can be selectively coupled together or uncoupled from each other to place the stapling device in a cutting mode or in a non-cutting mode. The stapling device may also include a locking member that locks a distal portion of the anvil to a distal portion of the cartridge assembly to define a maximum tissue gap between the anvil and the cartridge assembly.