Surgical Stapler Cartridge Keying for Compatibility and Staple Formation
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Solution Overview
Problem
Inadvertent use of incompatible staple cartridges in surgical staplers can lead to improperly formed staples, compromising tissue sealing, due to structural similarities that allow partial seating and potential firing, despite incompatibility.
Innovation Solution
Incorporation of unique cartridge features such as engagement protrusions, raised surfaces, and retention mechanisms that prevent improper loading and firing of incompatible staple cartridges, ensuring compatibility and effective staple formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If staple cartridges are made structurally similar for ease of loading, then ease of operation is improved, but reliability deteriorates due to inability to distinguish compatible cartridges
Solution Approach 1:
The patent applies local quality by adding unique engagement protrusions at specific locations on the staple cartridge that correspond to matching receptacles on compatible anvil jaws. These localized features maintain overall structural simplicity for ease of loading while providing distinctive local characteristics that ensure reliable compatibility verification through precise geometric matching.
2Reliability
If compatibility features are added to prevent incompatible cartridge use, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent employs asymmetry by designing engagement protrusions with specific non-symmetric geometries that only match corresponding asymmetric receptacles on compatible anvil jaws. This asymmetric feature arrangement prevents incompatible cartridges from being loaded while maintaining relatively simple overall cartridge structure, as the complexity is localized to the engagement features rather than the entire device.
Data Source
AI summary
A method of operating a surgical instrument includes clamping tissue with a surgical instrument end effector and actuating the end effector to drive staples into the clamped tissue, including a first longitudinal row having at least one first formed staple with a first formed shape in which the first legs are aligned laterally with each other and with the first crown; a second longitudinal row having at least one second formed staple with a second formed shape in which each second leg is skewed laterally away from the second crown at a first angle; and a third longitudinal row of third formed staples having at least one third formed staple with a third formed shape in which each third leg is skewed laterally away from the third crown at a second angle.