Surgical Stapling Device Lockout Mechanism
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Solution Overview
Problem
There is a need for a simple and effective lock mechanism in surgical stapling devices to prevent the advancement of the drive assembly when a spent staple cartridge is positioned within the channel member of the cartridge assembly, ensuring the device is not accidentally fired again.
Innovation Solution
A surgical stapling device with a lock mechanism that includes a rotatable lock member supported on the anvil, which moves from a locked to an unlocked position in response to the tool assembly's movement from the open to the clamped position, utilizing a biasing member like a coil spring to maintain the locked position and prevent drive assembly advancement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lock mechanism is added to prevent firing with a spent cartridge, then safety and reliability are improved, but device complexity increases
Solution Approach 1:
The lock member is integrated into the anvil assembly, combining the locking function with an existing structural component. This integration approach adds the safety function without requiring a completely separate locking mechanism, thereby improving reliability while minimizing the increase in device complexity.
Solution Approach 2:
The lock mechanism is designed to automatically engage and disengage based on the state of the staple cartridge and actuation sled. The lock member self-activates when the cartridge is spent or a new cartridge is inserted, eliminating the need for separate control systems or additional actuators, thus improving safety without proportionally increasing complexity.
2Reliability
If a lock mechanism with multiple components is used, then reliability is improved, but ease of manufacture deteriorates
Solution Approach 1:
The lock mechanism is segmented into distinct functional elements (lock member, biasing member, engagement features) that can be manufactured separately using standard machining processes and then assembled. This segmentation allows each component to be optimized for its specific manufacturing process while maintaining overall reliability, balancing safety requirements with ease of manufacture.
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 the stapling device from being fired with a spent cartridge by ensuring the lock member remains in the locked position until a new cartridge is inserted, ensuring safe and reliable operation.
Implementation Method 1
The lock mechanism includes a biasing member to urge the lock member towards the locked position. The biasing member includes a coil spring.
Data Source
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AI summary
A surgical stapling device includes a tool assembly having an anvil and a cartridge assembly that are movable in relation to each other between open and clamped positions. The cartridge assembly includes a staple cartridge that can be replaced after each firing of the stapling device to facilitate reuse of the stapling device. The anvil includes a lockout mechanism that prevents operation of the stapling device when the staple cartridge has been previously fired. The lockout mechanism moves from a locked position to an unlocked position in response to movement of the tool assembly from the open position to the clamped position.