Knitted Tissue Scaffolds for Consistent Surgical Sealing
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Solution Overview
Problem
Surgical staplers face challenges in achieving consistent sealing due to varying tissue thickness, leading to potential leakage and tissue tearing, as existing staples lack the natural flexibility and adaptability to intra-tissue pressures.
Innovation Solution
The development of knitted tissue scaffolds with multiple layers of bioabsorbable fibers, including multifilament and monofilament fibers with different degradation rates and glass transition temperatures, which are integrated into surgical staple cartridges to provide a deformable and compressible interface that adapts to tissue thickness and applies consistent stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional staples are used, then the stapling procedure is simple, but the seal consistency deteriorates due to varying tissue thickness
Solution Approach 1:
The scaffold is designed to be compressible and deformable, allowing it to dynamically adapt its shape and density to match the varying thickness of tissue at different staple sites. This dynamic property enables consistent sealing performance across non-uniform tissue surfaces without requiring multiple staple heights.
Solution Approach 2:
The scaffold combines multiple materials with different properties: a first material providing structural support and a second material enhancing flexibility and tissue conformity. This composite structure allows the scaffold to simultaneously maintain its shape for consistent stress application while adapting to tissue thickness variations.
2Strength
If rigid implant materials are used, then structural strength is improved, but tissue flexibility and pressure resistance deteriorate
Solution Approach 1:
The scaffold employs flexible polymer materials that can deform under intra-tissue pressure while maintaining structural integrity. This flexibility allows the scaffold to withstand physiological pressure variations without causing tissue tearing or leakage, unlike rigid traditional staples.
Solution Approach 2:
The scaffold materials are selected with specific mechanical parameters including elastic modulus and yield strength that match tissue properties. This parameter matching enables the scaffold to transition between rigid and flexible states as needed, providing both structural support and pressure adaptability.
3Ease of manufacture
If single-layer scaffold is used, then manufacturing is simpler, but functional performance deteriorates
Solution Approach 1:
The scaffold is divided into multiple functional layers, each performing a specific role: one layer provides structural support while another enhances sealing and tissue conformity. This segmentation allows each layer to be optimized for its specific function while maintaining overall manufacturing feasibility through established multi-layer fabrication techniques.
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
The knitted scaffolds ensure a consistent seal across varying tissue thicknesses, reduce tissue tearing, and promote tissue ingrowth, maintaining effective stress application for extended periods, thereby enhancing surgical outcomes.
Implementation Method 1
The method can also include annealing the first and second knitted layers interknitted with the spacer fibers
Data Source
AI summary
Staple cartridge assemblies for use with surgical stapling instruments and methods for manufacturing the same are provided. Scaffolds for use with a surgical staple cartridge and methods for manufacturing the same are also provided.