Surgical Stapler Knife Drive Lockout Mechanism
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Solution Overview
Problem
Surgical stapling apparatuses often face issues with inadvertent firing of the knife when a staple cartridge is not installed or is spent, leading to potential misfires and safety concerns.
Innovation Solution
The implementation of a knife drive lockout mechanism that includes resilient members and locking members, which prevent the knife from firing unless a cartridge is properly coupled and loaded, ensuring safe operation by engaging and disengaging based on the cartridge's status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a knife drive lockout mechanism is implemented to prevent inadvertent firing, then safety and reliability are improved, but device complexity increases due to additional resilient members and locking members
Solution Approach 1:
The lockout mechanism is pre-configured with resilient members and locking members that automatically engage or disengage based on cartridge installation status, preventing inadvertent knife firing before it can occur
Solution Approach 2:
Resilient members act as intermediaries between the cartridge and locking members, transferring the mechanical state (installed/not installed) to control the locking mechanism's engagement with the knife drive
2Reliability
If the knife is prevented from firing when cartridge is not installed, then safety is improved, but ease of operation deteriorates due to additional locking steps
Solution Approach 1:
The lockout mechanism is self-actuating through resilient members that automatically detect cartridge installation status and adjust locking engagement accordingly, eliminating the need for manual locking steps by the user
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
The mechanism effectively prevents misfires by ensuring the knife can only be actuated when a valid cartridge is installed, enhancing safety and reliability in surgical procedures.
Implementation Method 1
one or more resilient members thereon. Engagement between the knife and the resilient member(s) causes the resilient member(s) to move from an initial configuration to a final configuration
Data Source
AI summary
A surgical stapling apparatus (stapler) including a housing, elongated member, and a reload is disclosed. A cartridge is configured to selectively couple to a first jaw member of the reload and includes one or more resilient members thereon. An anvil operably supported on a second jaw member of the reload is configured to compress one or more fasteners ejected from the cartridge. The anvil includes one or more locking members thereon. A knife is configured to translate through the cartridge and anvil when the first and second jaw members are in a closed configuration. Engagement between the knife and the resilient member(s) causes the resilient member(s) to move from an initial configuration that allows the knife to travel distally past the locking member(s) to a final configuration that allows the locking member(s) to engage the knife.