Staple Cartridge Cover Geometry for Reliable Staple Release
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Solution Overview
Problem
In existing surgical staplers, the upper plate of the cartridge cover is high, causing staples to fail to be completely separated from the cartridge cover, affecting surgical efficacy.
Innovation Solution
The cartridge assembly features a cartridge cover with bending portions having staple holes where the first hole wall is higher than the second hole wall, allowing staples to be easily separated and providing more tissue accommodation for better puncture and formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the upper plate of the cartridge cover is made high to accommodate staples, then the staple holes can be positioned to guide staple formation, but the staples fail to be completely separated from the cartridge cover after closure
Solution Approach 1:
The staple holes are designed with asymmetric height dimensions, where the first hole wall extends higher than the second hole wall in the axial direction. This dimensional asymmetry creates a tapered passage that guides staple formation while providing clearance for complete staple separation after closure, resolving the contradiction between precise staple formation and easy separation.
Solution Approach 2:
The staple hole is segmented into two distinct walls (first hole wall and second hole wall) with different heights. This segmentation allows the hole structure to perform dual functions: the higher first hole wall guides staple formation during closure, while the lower second hole wall provides clearance for staple separation, eliminating the need for a uniformly high upper plate.
2Reliability
If the staple holes are positioned deeper in the cartridge cover to improve staple formation, then tissue accommodation is improved, but the staples become harder to separate from the cartridge cover
Solution Approach 1:
The staple hole incorporates asymmetric depth dimensions with the first hole wall extending deeper than the second hole wall. This dimensional variation allows the hole to provide sufficient depth for reliable tissue accommodation and staple formation, while the shallower second hole wall ensures that staples can be completely separated from the cartridge cover after closure.
Solution Approach 2:
Different regions of the staple hole are given different depths (local qualities), with the first hole wall being deeper to accommodate tissue and guide staple formation, and the second hole wall being shallower to facilitate staple separation. This local differentiation resolves the contradiction between deep tissue accommodation and easy staple separation.
Data Source
AI summary
A cartridge assembly, a head assembly and a surgical stapler are provided. The cartridge assembly includes: a staple strip including at least one staple strip body and staples, wherein each staple is rotatably connected to the staple strip body via a connecting portion; and a cartridge cover jacketed on the staple strip body, wherein the cartridge cover includes at least one bending portion extending in an axial direction of the stapler, the bending portion is provided with a plurality of staple holes, each staple hole includes a first hole wall and a second hole wall extending in the axial direction, and the first hole wall is higher than the second hole wall. The present disclosure makes the staplers easier to be separated from the cartridge cover after being closed.