Surgical Stapling Apparatus Firing System Load Disengagement
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Solution Overview
Problem
Prior surgical stapling apparatuses with disposable loading units are inadequate for thicker tissues, as they fail under increased loads, leading to potential patient injury due to the failure of the firing system when the knife is still in the anvil.
Innovation Solution
A surgical instrument with a manually actuatable handle and a driving pawl mechanism that disengages from the actuation shaft when a predetermined firing load is exceeded, preventing further actuation and ensuring safety by preventing the knife from being left in the anvil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the firing system is designed for standard tissue thickness, then the device can operate reliably for typical procedures, but it fails under increased loads when thicker tissues are encountered
Solution Approach 1:
The firing system incorporates a dynamic load-responsive mechanism where the actuation shaft can disengage from the drive member when excessive force is detected. This allows the system to adapt its mechanical coupling state based on real-time tissue resistance, preventing failure in thicker tissues while maintaining reliability for standard procedures.
Solution Approach 2:
The actuation shaft serves as an intermediary element between the trigger mechanism and the drive member. It mediates the force transmission and can selectively disengage when load thresholds are exceeded, providing a safety function that protects against firing system failure in thicker tissues.
2Productivity
If the knife is allowed to remain in the anvil after firing, then the procedure can be completed, but this creates a safety hazard that may leave the knife in the patient
Solution Approach 1:
The system performs a preliminary safety check through mechanical interlocking where the actuation shaft must be fully retracted before the knife can be released from the anvil. This preliminary retraction action ensures the knife cannot remain in the anvil, eliminating the safety hazard while allowing procedure completion.
Solution Approach 2:
The mechanical coupling between the actuation shaft and drive member provides feedback on the firing cycle status. The disengagement mechanism only activates when the knife has fully exited the anvil, providing real-time feedback that prevents premature release and ensures patient safety.
Data Source
AI summary
Disclosed is a disposable surgical stapling unit configured for use with an actuation device that has an elongated shaft assembly. The disposable surgical stapling unit may include a housing assembly and a staple cartridge carrier configured to operably support a staple cartridge, and a drive member operably supported within the staple cartridge carrier. The drive member may comprise a cutting edge to cut tissue and a proximal end configured for operable engagement with a control member operably supported within the elongated shaft assembly. The disposable surgical stapling unit may further include articulation joints operably supported between the housing assembly and the staple cartridge carrier for selectively articulating the staple cartridge carrier about multiple articulation axes.