Welded Surgical Stapling Anvil for Lower Stress Concentration
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Solution Overview
Problem
Current surgical stapling instruments face challenges in efficiently stapling and cutting tissue due to stress concentrations and inefficiencies in the anvil and firing member interactions, leading to suboptimal performance and potential damage.
Innovation Solution
The development of advanced surgical stapling systems with improved anvil designs, including welded configurations and interlocking features, and optimized firing member mechanisms that reduce stress concentrations and enhance the stapling process, ensuring uniform tissue compression and efficient staple formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional anvil designs are used in surgical stapling instruments, then manufacturing is simpler, but stress concentrations occur during stapling leading to suboptimal performance and potential damage
Solution Approach 1:
The anvil is divided into multiple segments including a first anvil member and a second anvil member that can be separately manufactured and then joined through welding. This segmentation allows each component to be optimized independently for stress distribution while maintaining overall structural integrity during the stapling process.
Solution Approach 2:
The first and second anvil members are joined through welding to form an integrated anvil structure. This merging combines the benefits of segmented design for stress management with the structural coherence needed for reliable stapling performance, eliminating stress concentrations that would occur in traditional monolithic designs.
2Reliability
If advanced welded anvil configurations are implemented, then stress concentrations are reduced and stapling performance improves, but manufacturing complexity increases
Solution Approach 1:
The anvil components are designed as separate weldable segments that can be manufactured using standard machining processes. The segmentation enables independent optimization of each component's geometry for stress distribution, while the welding process joins them to create the final durable structure.
Solution Approach 2:
The design incorporates specific geometric parameters and material properties that optimize the welding process and the resulting joint strength. By carefully controlling dimensional parameters and material selection, the manufactured anvil achieves enhanced durability without requiring exotic manufacturing techniques.
3Manufacturing precision
If optimized firing member mechanisms are used, then staple formation consistency improves, but device complexity increases
Solution Approach 1:
The firing member mechanism incorporates localized features such as specific cam profiles, ramp angles, and surface geometries that precisely control staple deformation. These local quality enhancements ensure consistent staple formation at critical interaction points without requiring complex mechanisms throughout the entire device.
Solution Approach 2:
The firing member mechanism utilizes dynamic elements including cams and ramps that convert rotational or linear motion into precise controlled forces for staple formation. The dynamic design allows for consistent staple geometry through controlled motion sequences while maintaining relatively simple overall mechanism architecture.
Data Source
AI summary
A method for manufacturing a surgical stapling anvil is disclosed. The method comprises the steps of manufacturing a first anvil member and a second anvil member. The first anvil member comprises a tissue-facing surface comprising a plurality of staple forming pockets defined therein and a longitudinal cavity comprising anvil ledges configured to be engaged by anvil-camming portions of a firing member of a surgical stapling instrument. The method further comprises the steps of polishing the ledges of the first anvil member and welding the first anvil member and the second anvil member together.