Surgical Stapler Cam Mechanism for Multi-Actuation
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Solution Overview
Problem
Existing surgical staplers are typically configured for single-use, requiring replacement of the staple cartridge after each actuation, which limits their multi-actuation capability in applying surgical staples and cutting tissue.
Innovation Solution
A surgical stapling apparatus with a body portion and a tool assembly that includes an input cam member, a drum member, and an output cam member, where linear movement of the input cam member causes rotatable movement of the drum member, and subsequently linear movement of the output cam member, allowing for multiple actuations without replacing the staple cartridge, by utilizing a mechanism of slots and posts to effectuate the movement of the anvil and pusher driver relative to the staple cartridge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a surgical stapler is configured for single-use with a staple cartridge, then the structure is simple and reliable, but the productivity decreases because the cartridge must be replaced after each actuation
Solution Approach 1:
The anvil is made movable relative to the staple cartridge through a cam mechanism, allowing it to transition between retracted and advanced positions. This dynamic configuration enables multiple actuations without replacing the cartridge, as the anvil can be repositioned to engage with different rows of staples sequentially
Solution Approach 2:
The surgical instrument is divided into distinct functional modules: a fixed staple cartridge containing multiple rows of staples, a movable anvil with forming pockets, and a cam mechanism for controlling anvil movement. This segmentation allows the staple cartridge to remain in place while only the anvil moves, enabling multiple actuations
2Adaptability or versatility
If the anvil is made movable to enable multiple actuations, then the multi-actuation capability is improved, but the device complexity increases due to additional cam mechanisms
Solution Approach 1:
The cam mechanism serves multiple functions: it controls the advancement of the anvil relative to the cartridge, enables repositioning for multiple actuations, and maintains the structural integrity of the instrument. This multi-functionality reduces the need for separate mechanisms for each action
Solution Approach 2:
The cam mechanism acts as an intermediary between the operator's actuation and the anvil's movement. By using the cam's geometric profile, the complex motion of anvil advancement and retraction is achieved through a simple rotational or linear input, reducing the overall system complexity
Data Source
AI summary
A surgical stapling apparatus for progressively stapling and forming an incision in body tissue is provided. The apparatus includes a body portion and a tool assembly supported on the body portion. The apparatus further includes an input cam member slidable within the body portion, a drum member rotatably supported within the body portion, and an output cam member slidable within the body portion. The drum member is coupled to the input cam member such that linear movement of the input cam member effects rotatable movement of the drum member. The output cam member is coupled to the drum member such that rotatable movement of the drum member effects linear movement of the output cam member. Linear movement of the input cam member effects movement of an anvil in relation to a cartridge between unclamped and clamped positions.