Surgical Stapler Closure Lockout Mechanism
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Solution Overview
Problem
Existing surgical staplers lack effective mechanisms to ensure that the clamp lever remains open until the stapler halves are sufficiently approximated, potentially leading to premature closure and improper stapling or cutting.
Innovation Solution
Incorporation of a closure lockout feature, such as a lockout pin on the anvil half, which prevents the clamp lever from closing until the stapler halves are properly aligned, and additional features like a button member to prevent firing until the clamp lever is fully closed, ensuring precise stapling and cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a closure lockout feature (lockout pin) is added to prevent premature closure, then reliability of proper alignment is improved, but device complexity increases
Solution Approach 1:
The lockout pin is positioned in advance to block the clamp lever closure path before closure can occur. The pin protrudes into the path of the clamp lever tip, preventing closure until the stapler halves are properly approximated and the pin is no longer in the blocking position. This preliminary blocking action ensures alignment is achieved before closure is permitted.
Solution Approach 2:
The lockout pin serves as an intermediary mechanical element between the clamp lever and the anvil half. It mediates the closure action by selectively blocking or permitting the clamp lever from engaging the anvil half, depending on whether the stapler halves are properly aligned. This intermediary component translates positional alignment into closure permission.
2Manufacturing precision
If additional lockout features are added to ensure proper closure, then manufacturing precision requirements are improved, but device complexity increases
Solution Approach 1:
The lockout pin is positioned at a specific location on the anvil half that corresponds to the precise alignment position required for proper stapling. The pin's location is optimized to block closure only when misalignment exists, while permitting closure when alignment is correct. This localized positioning provides precision control without requiring complex mechanisms throughout the entire device.
Data Source
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AI summary
A surgical stapler includes a first elongate member having a distal portion that supports a plurality of staple-forming pockets, a second elongate member having a distal portion that supports a staple cartridge, and a clamp member movable from an open position to a closed position to releasably clamp the first and second elongate members together. A clamp lockout feature is supported by the first elongate member and is moveable between a lockout position in which the clamp lockout feature prevents closure of the clamp member, and a release position in which the clamp lockout feature permits closure of the clamp member. An actuating feature is supported by the second elongate member and is configured to actuate the clamp lockout feature from the lockout position to the release position in response to approximation of the distal portions of the first and second elongate members.