Surgical Stapler Lockout Sleeve Mechanism
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Solution Overview
Problem
Current surgical stapling devices lack a mechanism to prevent re-approximation of the anvil assembly with the cartridge assembly after initial firing, leading to potential misuse by surgeons attempting to fire the device again despite exhausted staples.
Innovation Solution
Incorporation of a lockout mechanism, specifically a lockout sleeve that engages the anvil and cartridge assemblies post-firing to inhibit re-approximation, ensuring the device cannot be fired again once staples are depleted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If no lockout mechanism is provided, then the device can be operated multiple times, but the risk of unintended reuse after staple exhaustion increases
Solution Approach 1:
The lockout mechanism is activated automatically after the first firing action, preventing any subsequent approximation attempts before the surgeon can even consider reuse. The lockout sleeve moves to a blocking position that physically prevents anvil re-approximation, ensuring that the device cannot be accidentally or intentionally reused after staples are exhausted.
Solution Approach 2:
The lockout sleeve acts as an intermediary component between the anvil assembly and cartridge assembly. It inserts itself into the approximation path, serving as a physical mediator that blocks the anvil from reaching the cartridge unless the lockout mechanism is first reset or replaced, thereby preventing unintended reuse.
2Adaptability or versatility
If the anvil assembly can be re-approximated after firing, then the device is more versatile, but the safety risk of firing with exhausted staples increases
Solution Approach 1:
The lockout mechanism applies a preliminary anti-action by blocking the approximation path before any attempt to re-fire can occur. The lockout sleeve positions itself to prevent the anvil from approaching the cartridge, counteracting any potential harmful action of firing with exhausted staples before it can happen.
Solution Approach 2:
The lockout mechanism is designed as a single-use component that is discarded or replaced with each new cartridge-anvil assembly set. This disposable approach ensures that each surgical procedure starts with a fresh, unlocked state, eliminating the risk of reused lockout mechanisms compromising safety.
3Reliability
If a lockout mechanism is added, then reuse is prevented, but the device structure becomes more complex
Solution Approach 1:
The lockout sleeve is merged with the existing approximation mechanism components. It utilizes the same approximation path and engagement features that already exist in the device, rather than creating entirely separate systems. This integration minimizes the added structural complexity while achieving the lockout function.
Solution Approach 2:
The lockout sleeve serves multiple functions: it acts as a safety barrier preventing reuse, a mechanical block in the approximation path, and a visual indicator of device status. By combining multiple functions into a single component, the overall device complexity is minimized while achieving reliable single-use enforcement.
Data Source
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AI summary
A surgical stapling device is disclosed including a cartridge assembly (102) and an anvil assembly (140). The anvil assembly is translatable relative to the cartridge assembly between a spaced position, where the anvil assembly is spaced from the cartridge assembly, and an approximated position, where the anvil assembly is in close cooperative alignment with the cartridge assembly for clamping tissue disposed therebetween. A lockout sleeve (200) is slidably supported on the cartridge assembly and translatable relative to the cartridge assembly and the anvil assembly between a first position and a second position. The lockout sleeve is configured to engage the anvil assembly and the cartridge assembly when the lockout sleeve is in the second position to inhibit translation of the anvil assembly relative to the cartridge assembly from the spaced position to the approximated position.