Circular Stapler Two-Stroke Mechanism for Anastomosis
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Solution Overview
Problem
Current surgical stapling devices for circular anastomosis and hemorrhoid treatment often require simultaneous actuation of staple formation and tissue cutting, which can be inefficient and may lead to suboptimal staple formation due to tissue displacement during cutting.
Innovation Solution
A surgical stapler design featuring a pusher assembly and knife assembly with a knife carrier and latch system that allows for independent control of staple ejection and tissue cutting, utilizing a two-stroke mechanism to separate staple formation and cutting functions, and incorporating a communication chip for data communication and optimized operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If simultaneous actuation of staple formation and tissue cutting is used, then device complexity is reduced, but manufacturing precision deteriorates due to tissue displacement during cutting
Solution Approach 1:
The actuation mechanism is divided into two independent strokes: a first stroke for staple formation and a second stroke for tissue cutting. This segmentation allows each function to be performed independently with optimal precision without interference from the other function, resolving the contradiction between device simplicity and manufacturing precision.
2Device complexity
If simultaneous actuation of staple formation and tissue cutting is used, then device complexity is reduced, but productivity deteriorates due to inefficient tissue handling
Solution Approach 1:
The two-stroke mechanism separates staple formation and tissue cutting into distinct phases, allowing optimized control over each step. This segmentation improves productivity by enabling precise tissue handling and stapling without the inefficiencies of simultaneous operation, where tissue displacement occurs.
3Manufacturing precision
If independent control of staple ejection and tissue cutting is implemented, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The mechanism uses dynamic control where the pusher assembly and knife assembly can be independently actuated through the same drive member. The pusher assembly includes a pusher member that can be selectively advanced, and the knife assembly includes a knife carrier with latch that can be independently controlled. This dynamic, selective actuation provides precise control over staple crimp height and tissue cutting without requiring completely separate mechanical systems.
Data Source
AI summary
A circular stapler is disclosed. The circular stapler comprises a handle assembly, an elongate body, and a cartridge assembly. The elongate body extends from the handle assembly and defines a longitudinal axis. The cartridge assembly is disposed adjacent a distal end of the elongate body. The cartridge assembly includes a pusher assembly and a knife assembly. The pusher assembly is movable to cause staples to be ejected from the cartridge assembly. The knife assembly is selectively movable relative to the pusher assembly to distally translate a knife. A knife carrier of the knife assembly includes at least one latch thereon. The at least one latch is configured to contact an engagement surface of the pusher assembly in response to movement between the knife carrier and the pusher assembly. The at least one latch is prevented from distally translating beyond the engagement surface.