Variable Gap Staple Cartridge for Tissue Compression Control
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Solution Overview
Problem
Conventional surgical fastening apparatuses face challenges in achieving optimal hemostasis and tissue healing by applying uniform pressure, which can lead to necrosis and prolonged recovery due to excessive compression, and struggle to accommodate varying tissue thicknesses during surgical procedures.
Innovation Solution
The surgical stapling instrument features a variable gap between the anvil and staple cartridge, allowing for a pressure gradient and adjustable tissue compression, using different-sized surgical fasteners and removable tissue contacting sections to accommodate different tissue thicknesses, thereby optimizing anastomotic strength and hemostasis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uniform pressure is applied to compress tissue for hemostasis, then bleeding is stopped, but tissue necrosis and prolonged recovery occur due to excessive compression
Solution Approach 1:
The cartridge employs varying gap heights across different sections to create localized pressure differences. Specifically, the cartridge includes a first section with a first gap height and a second section with a second gap height that is less than the first gap height, enabling different compression levels in different tissue regions to achieve hemostasis while preventing necrosis.
Solution Approach 2:
The invention changes the physical parameter of gap height to control compression pressure. By varying the gap height between the cartridge and anvil across different sections, the system adjusts the compression force applied to tissue, allowing optimization between hemostasis and tissue viability.
2Reliability
If increased pressure is applied to stop bleeding, then hemostasis is achieved, but blood flow to surrounding tissue is reduced causing slower healing
Solution Approach 1:
The cartridge applies different compression levels to different regions: higher pressure in areas requiring hemostasis and lower pressure in areas needing blood flow for healing. The varying gap heights enable this differentiated approach, stopping bleeding where necessary while maintaining perfusion in surrounding tissue.
3Strength
If conventional fastening apparatus is used, then tissue can be joined, but varying tissue thicknesses cannot be accommodated
Solution Approach 1:
The cartridge is divided into multiple sections with different gap heights, allowing each section to accommodate different tissue thicknesses. This segmentation enables the same cartridge to handle varying tissue depths across the surgical field.
Solution Approach 2:
The system transitions from a static, uniform gap design to a dynamic, variable gap design that adapts to different tissue thicknesses. The varying gap heights allow the apparatus to adjust its compression profile to match the actual tissue geometry.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration improves hemostasis and tissue healing by providing a balanced pressure gradient, minimizing tissue trauma while maintaining high anastomotic strength, and accommodating varying tissue thicknesses through adjustable staple sizes and deployment.
Implementation Method 1
The gap defined between the anvil and the cartridge has at least two different sizes between a first and a second end of the length of the operative tool... the anvil and the cartridge are adapted to grasp tissue therebetween such that a pressure corresponding to the size of the gap between the anvil and the cartridge is applied to the tissue
Data Source
AI summary
A surgical stapling apparatus includes a staple cartridge and an anvil member. The staple cartridge includes a plurality of surgical fasteners disposed in rows of retention slots. The staple cartridge may have an annular or linear configuration of retention slots. The tissue contacting surface of the staple cartridge may be tapered or stepped. The anvil member has a tissue contacting surface that includes a number of pockets arranged for substantially aligning with the retention slots. In addition, the tissue contacting surface of the anvil member may complement the tissue contacting surface of the staple cartridge.