Compliant Tissue Contact Surfaces for Uniform Compression
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Solution Overview
Problem
Existing surgical stapling devices inflict trauma on tissue due to uneven compression, particularly in tissues with non-uniform density, as the rigid anvil and cartridge surfaces do not adapt to varying tissue thickness and density.
Innovation Solution
Incorporating a compliant material into the tissue engaging surfaces of the anvil and staple cartridge, allowing the device to adapt to the topography of the tissue, ensuring uniform compression along the length of the tool assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rigid materials are used for tissue contact surfaces of the anvil and staple cartridge, then structural strength and stability are improved, but tissue trauma increases due to uneven compression of non-uniform tissue
Solution Approach 1:
The patent applies a compliant coating material specifically to the tissue contact surfaces of the anvil and staple cartridge, while maintaining rigid structural components elsewhere. This local application of compliance allows the contact surfaces to adapt to non-uniform tissue topography and distribute compression forces evenly, reducing tissue trauma without compromising the overall structural strength of the stapling device
Solution Approach 2:
The patent combines rigid structural materials with compliant coating materials to create a composite tissue contact surface. The rigid substrate provides structural support and stability, while the compliant coating layer (such as silicone rubber or other elastomeric materials) conforms to tissue irregularities and ensures uniform compression, thereby resolving the contradiction between structural strength and tissue trauma reduction
2Ease of manufacture
If rigid tissue contact surfaces are used, then manufacturing simplicity is improved, but adaptability to varying tissue topography deteriorates
Solution Approach 1:
The compliant coating is applied only to the specific tissue contact surfaces that require adaptability, while the rest of the device maintains simple rigid construction. This localized approach to compliance allows the device to adapt to tissue topography variations without requiring complex manufacturing processes for the entire device
Solution Approach 2:
The patent employs thin compliant coating layers on the tissue contact surfaces that can conform to varying tissue topography. These thin flexible films are relatively simple to manufacture through conventional coating techniques and provide the necessary adaptability without adding significant manufacturing complexity to the overall device
3Object-affected harmful factors
If uniform compression is achieved through compliant materials, then tissue trauma is reduced, but device complexity increases
Solution Approach 1:
The compliant materials are applied only to the tissue contact surfaces where compression occurs, rather than throughout the entire device. This localized compliance achieves uniform tissue compression and trauma reduction while minimizing the addition of complex components and structures to the overall device design
Solution Approach 2:
The patent changes the physical parameter of the tissue contact surfaces by applying compliant materials with specific elastic properties. This parameter change allows the surfaces to dynamically adapt to tissue variations and provide uniform compression without requiring complex mechanical adjustment mechanisms or active control systems
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 use of compliant materials in the tissue engaging surfaces of the surgical stapling device minimizes tissue trauma by uniformly compressing tissues of varying thickness and density, reducing the risk of injury during the stapling process.
Implementation Method 1
One or both of the tissue engaging surfaces of the anvil and the staple cartridge includes or is formed with a compliant material that allows the tool assembly to adapt to the topography of the tissue being clamped between the tissue engaging surfaces to uniformly compress the tissue along the length of the tool assembly
Data Source
AI summary
A surgical instrument includes a tool assembly having an anvil and a cartridge assembly that are movable in relation to each other between an open position and a clamped position to clamp tissue between the anvil and the cartridge assembly. The staple cartridge and/or the anvil includes a tissue contact surface that is formed of or includes a compliant material to allow the tool assembly to adapt to the topography of the tissue being clamped to uniformly compress the tissue along the length of the tool assembly and minimize trauma inflicted on the tissue.