Non-Tangential Staple Pattern for Radial Expansion in Circular Surgical Staplers
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Solution Overview
Problem
Current circular surgical staplers face challenges in efficiently forming anastomoses between tubular anatomical structures, particularly in accommodating the expansion and contraction of digestive tract portions during peristalsis, as existing staple patterns can restrict radial expansion and lead to tissue obstruction.
Innovation Solution
The design incorporates a stapling head assembly and anvil configuration that allows for the formation of non-tangential staple patterns, with staple openings and drivers oriented to facilitate radial expansion, and a cutting mechanism that minimizes the radial extent of severed edges within the anatomical structures, enhancing the structural integrity and functionality of the anastomosis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional tangential staple patterns are used, then the stapling process is simple and efficient, but the radial expansion of the digestive tract is restricted and tissue obstruction occurs
Solution Approach 1:
The staple openings are arranged in an asymmetric non-tangential pattern relative to the circular deck, with staples positioned at varying angular orientations rather than uniform tangential alignment. This asymmetric arrangement creates gaps that accommodate radial expansion while maintaining structural integrity.
Solution Approach 2:
The staple pattern transitions from a traditional two-dimensional tangential arrangement to a three-dimensional non-tangential configuration, where staples are oriented at multiple angles relative to the circular deck perimeter. This dimensional change allows the staple pattern to flex and accommodate radial movements of the digestive tract.
2Adaptability or versatility
If non-tangential staple patterns are formed, then radial expansion is accommodated, but the staple opening orientation and driver alignment become more complex
Solution Approach 1:
The circular deck serves multiple functions: it provides the structural base for staple formation, defines the anastomosis circumference, and its geometric properties inherently guide the non-tangential staple orientation. The single circular deck design integrates several functions that would otherwise require separate components.
Solution Approach 2:
The staple openings are positioned at specific angular parameters relative to the circular deck, with non-tangential orientations defined by precise geometric relationships. By changing the angular parameters of staple placement from traditional tangential to non-tangential positions, the system accommodates radial expansion while maintaining制造 feasibility.
3Productivity
If the cutting mechanism severes tissue extensively, then the anastomosis is complete, but the radial extent of severed edges causes tissue obstruction
Solution Approach 1:
The cutting mechanism is designed to sever tissue only at the specific location where the circular deck contacts the tissue, rather than extending cuts radially inward. This localized cutting approach completes the anastomosis while minimizing the radial extent of severed edges, preventing tissue obstruction in the lumen.
Data Source
AI summary
A surgical stapling instrument includes an anvil and a stapling head assembly. The anvil defines staple forming pockets. The stapling head assembly includes a body, a coupling member, a firing assembly, and a staple deck. The coupling member is configured to actuate relative to the body to thereby acuate the anvil relative to the body. The firing assembly is configured to drive staples against the staple forming pockets of the anvil. The staple deck is defined by an outer arched perimeter and an inner arched perimeter fixed to the body. The staple deck defines staple openings. At least one non-tangential staple opening in the of staple openings extends along a longitudinal axis in a non-tangential relationship with a closest tangent line of the inner arched perimeter or the outer arched perimeter.