Lockout Arrangement for Surgical End Effectors
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Solution Overview
Problem
Current surgical stapling instruments lack an effective mechanism to prevent accidental firing when a spent or unspun staple cartridge is present, leading to potential errors and inefficiencies during surgical procedures.
Innovation Solution
A lockout arrangement is integrated into the surgical instrument, which ensures that the firing system can only be actuated if an unspent staple cartridge is installed and ready for use, preventing accidental firing and ensuring proper cartridge status before each use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a simple firing mechanism is used, then the device complexity is reduced, but the reliability decreases due to risk of accidental firing with spent cartridges
Solution Approach 1:
The lockout feature is nested within the firing mechanism structure. The lockout cam is positioned within the firing member assembly, and the lockout feature on the staple cartridge interacts with this nested structure. This allows the safety function to be integrated into the existing mechanism without adding significant external complexity.
Solution Approach 2:
The lockout cam acts as an intermediary element between the firing trigger and the firing mechanism. When the staple cartridge is spent, the lockout feature prevents the cam from rotating to the position that would enable firing. This intermediary mechanism provides the safety function while maintaining a relatively simple overall structure.
2Reliability
If a lockout arrangement is added to prevent accidental firing, then the reliability improves, but the device complexity increases
Solution Approach 1:
The lockout mechanism performs a preliminary check before allowing firing. The lockout cam must be in the correct position, which is only possible when an unspent cartridge is installed with its lockout feature properly engaged. This preliminary verification ensures cartridge status is checked before the firing action can occur.
Solution Approach 2:
Instead of having a complex sensor system that actively detects cartridge status and then enables or disables firing, the invention inverts the approach: the spent cartridge itself creates the lockout condition through its lockout feature. The system defaults to locked and requires the presence of a proper cartridge to enable firing, simplifying the overall control mechanism.
3Productivity
If manual checking of cartridge status is required, then the device complexity is minimized, but the loss of time increases due to manual verification
Solution Approach 1:
The staple cartridge performs the verification function for itself through its lockout feature. The physical presence of an unspent cartridge automatically enables the firing mechanism by allowing the lockout cam to rotate to the firing position. No separate verification step is needed - the cartridge's own structure provides the verification.
Solution Approach 2:
The lockout mechanism provides immediate mechanical feedback to the surgeon about cartridge status. When a spent cartridge is installed, the lockout feature prevents cam rotation, providing clear tactile and visual feedback that firing is blocked. This eliminates the need for separate checking procedures while maintaining surgical workflow efficiency.
Data Source
AI summary
Surgical end effectors are disclosed. The surgical end effectors can include a first jaw, a second jaw rotatably coupled to the first jaw, and a lockout arrangement configured to prevent rotational movement of the second jaw toward the first jaw unless an unfired staple cartridge is positioned in the first jaw. The lockout arrangement can comprise a pivotable lock configured to pivot between a locked orientation and an unlocked orientation, a shiftable lock bar, and/or a spring-loaded lockout lever.