Surgical Stapler End Effector Articulation for Precise Repositioning
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Solution Overview
Problem
Surgical staplers face challenges in efficiently repositioning the end effector during procedures due to the need for manual activation of release mechanisms and limited articulation capabilities, which can lead to suboptimal tissue stapling and cutting.
Innovation Solution
The development of a surgical instrument with a detachable drive mount and articulation joint system that allows for multiple degrees of freedom, enabling precise positioning of the end effector through rotary motions and articulation, and a control system with a joystick and thumbwheel interface for intuitive motor control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a release mechanism is used to pivot the anvil into an open position for repositioning, then the end effector can be repositioned, but the surgeon must manually activate the release mechanism which increases operation time and reduces efficiency
Solution Approach 1:
The anvil is designed with a spring-loaded release mechanism that automatically pivots the anvil into the open position when the surgeon applies pressure to the distal end of the elongate channel. This self-service mechanism eliminates the need for manual activation of a separate release mechanism, allowing the end effector to reposition itself automatically and reducing operation time.
Solution Approach 2:
A spring mechanism acts as an intermediary between the surgeon's input (pressure on the distal end) and the anvil's movement. The spring stores and releases energy to automatically pivot the anvil open, serving as a mediator that converts the surgeon's simple pressure input into the complex motion of opening and repositioning the end effector.
2Device complexity
If the end effector is designed with limited articulation capabilities to simplify the structure, then the device complexity is reduced, but the precision and dexterity in positioning the end effector during surgery is compromised
Solution Approach 1:
The articulation system is designed with a rotary joint that allows the end effector to rotate dynamically about an articulation axis. This dynamic capability enables the end effector to achieve multiple orientations and positions during surgery, improving positioning precision without requiring an overly complex static structure. The rotary mechanism provides controlled movement while maintaining structural simplicity.
3Manufacturing precision
If a motorized articulation system with multiple degrees of freedom is implemented to improve positioning precision, then the end effector can be precisely positioned, but the device complexity and control system requirements increase significantly
Solution Approach 1:
The articulation system is segmented into distinct functional components: a rotary joint for rotation about the articulation axis, and a pivot mechanism for opening and closing the end effector. This segmentation allows each component to perform a specific function with simple mechanics, avoiding the need for a complex multi-axial motorized system while still achieving precise positioning through coordinated movement of the segmented components.
Data Source
AI summary
A surgical system comprising an elongate shaft and an end effector is disclosed herein. The end effector comprises a first jaw, a second jaw, and a staple cartridge comprising staples removably stored therein, wherein the first jaw is movable relative to the second jaw. The surgical system further comprises a first rotatable drive system configured to close the first jaw and a second rotatable drive system. The second rotatable drive system comprises a drive screw, a drive member movable between a proximal position and a distal position during a staple firing stroke, and a sled configured to eject the staples from the staple cartridge during the staple firing stroke. The sled is not pulled proximally by the drive member when the drive member is retracted. The end effector, the drive screw, and the sled comprise a replaceable assembly.