Surgical Stapler Lockout Mechanism for Cartridge Verification
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Solution Overview
Problem
Current surgical stapling instruments face challenges in ensuring proper functioning and safety due to the lack of effective mechanisms for preventing accidental firing or improper staple cartridge installation, which can lead to inadequate tissue stapling and cutting performance.
Innovation Solution
The development of a surgical stapling system with a camming assembly and lockout features that ensure the firing member is only activated when a compatible staple cartridge is installed, preventing accidental firing and ensuring consistent stapling and cutting performance by engaging the camming assembly only when a fresh, unfired cartridge is present.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a firing member is made movable to enable stapling operation, then stapling functionality is improved, but risk of accidental firing increases
Solution Approach 1:
The lockout feature is engaged in advance before the firing member is made movable. The incompatible feature on the cartridge interacts with the lockout feature to prevent movement of the firing member, thereby eliminating the risk of accidental firing before the proper cartridge is installed.
Solution Approach 2:
The lockout feature acts as an intermediary mechanism between the firing member and the cartridge. It mediates the interaction by blocking the firing member's movement until a compatible cartridge with the matching compatible feature is installed, thus resolving the contradiction between enabling stapling and preventing accidental firing.
2Reliability
If a lockout feature is added to prevent accidental firing, then safety is improved, but device complexity increases
Solution Approach 1:
The lockout feature is merged with the existing firing member structure rather than being a completely separate component. The compatible feature on the cartridge integrates with this lockout mechanism, allowing the safety function to be achieved while minimizing additional structural complexity.
3Manufacturing precision
If a camming assembly is designed to engage only with compatible cartridges, then stapling precision is improved, but adaptability decreases
Solution Approach 1:
The camming assembly is designed with an asymmetric engagement mechanism where the compatible feature on the cartridge has a specific geometric configuration that only matches the corresponding camming assembly geometry. This asymmetric design ensures precise engagement for compatible cartridges while naturally preventing engagement with incompatible cartridges, thus maintaining stapling precision without requiring additional adaptability mechanisms.
Data Source
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AI summary
A surgical stapling instrument including a first jaw configured to removably support a surgical staple cartridge therein and a second jaw movable relative to the first jaw between an open position and a closed position. A firing member is configured to axially move between a starting and ending position upon application of a firing motion thereto. A firing member lockout interfaces with ae camming assembly in the surgical staple cartridge to lockout the firing member unless the camming assembly is in an unfired position. A cartridge verification member is configured to move the camming assembly out of the unfired position to an intermediate position unless the cartridge verification member detects a verification feature on the surgical staple cartridge.