Surgical Stapler Shifting Assembly for Safe Firing Control
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Solution Overview
Problem
Existing surgical stapling and cutting instruments face challenges in efficiently and reliably stapling and cutting tissue, particularly in ensuring precise control over the stapling and cutting processes, and in preventing unintended firing or stapling during improper operation.
Innovation Solution
The development of a surgical stapling instrument with a shifting assembly that allows for selective control over the closure and firing drives, incorporating a shifting mechanism to ensure precise tissue stapling and cutting, and includes safety features to prevent unintended firing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a surgical stapling instrument is designed with both closure and firing drives, then the instrument can perform stapling and cutting functions, but the risk of unintended firing increases
Solution Approach 1:
The drive system is segmented into separate closure drive and firing drive mechanisms, each with independent control. The closure drive controls jaw closure while the firing drive controls staple deployment, allowing precise control over when each function activates and reducing the risk of unintended firing.
Solution Approach 2:
A shifting assembly acts as an intermediary mechanism between the user input and the drive systems. This shifting mechanism selectively engages either the closure drive or the firing drive based on the selected mode, ensuring that only the intended function is activated and preventing cross-contamination of functions.
2Ease of operation
If a shifting assembly is added to control drive selection, then precise control over stapling and cutting is achieved, but device complexity increases
Solution Approach 1:
The shifting assembly merges the selection and actuation functions into a single integrated mechanism. By combining the mode selection (closure/firing) with the drive engagement in one assembly, the design reduces overall complexity compared to having separate selection switches and engagement mechanisms.
Solution Approach 2:
The shifting assembly uses dynamic engagement where the selected mode automatically activates the corresponding drive mechanism. This dynamic coupling eliminates the need for additional static switches or separate engagement mechanisms, simplifying the overall system while maintaining precise control.
3Reliability
If safety features are implemented to prevent unintended firing, then reliability is improved, but the device complexity increases
Solution Approach 1:
The shifting assembly prevents unintended firing by preliminarily blocking the firing drive unless the correct mode is selected. This preliminary prevention mechanism ensures that the firing function cannot be accidentally activated, as the shifting mechanism must be deliberately positioned to the firing mode before the firing drive becomes active.
Data Source
AI summary
A surgical stapling attachment configured to clamp, staple, and cut tissue is disclosed. The surgical stapling attachment comprises an attachment portion, a shaft assembly, an articulation joint, and an end effector assembly. The end effector assembly comprises a firing system configured to cut tissue only after the tissue has been stapled.