Dissimilar Metal Staple Cartridge Voltage Gradient
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Solution Overview
Problem
Surgical stapling devices face challenges in minimizing the healing time of stapled tissue, as existing staple rows fail to prevent natural degradation and maintain tissue integrity due to slow wound healing.
Innovation Solution
A staple cartridge design featuring rows of staples made from dissimilar metals with different anodic indices, creating a voltaic cell to drive an electrical potential within the tissue, enhancing cell migration and wound healing by forming a voltage gradient.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional single-metal staple rows are used, then the device structure is simple and manufacturing is easy, but the wound healing time is prolonged and tissue integrity is compromised due to natural degradation
Solution Approach 1:
The staple cartridge employs rows of staples made from dissimilar metals with different anodic indices (e.g., inner row: magnesium with anodic index of -1.75V; outer row: titanium with anodic index of -0.30V). This composite material approach creates a voltaic cell effect that generates electrical potential to accelerate cell migration and wound healing, directly addressing the healing time issue while maintaining structural functionality.
Solution Approach 2:
Different rows of staples are assigned different metal compositions based on their specific functional requirements. The inner row staples use one metal composition optimized for certain properties, while outer row staples use another metal composition optimized for different properties. This local differentiation allows each row to perform its specific function optimally while collectively achieving accelerated healing.
2Reliability
If dissimilar metal staples are used to create voltaic cell, then cell migration and wound healing are accelerated, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The staple cartridge divides staples into multiple rows with distinct metal compositions (e.g., inner row with first metal, outer row with second metal). Each row is independently configured during manufacturing, allowing for modular assembly processes. The cartridge body includes multiple staple pockets arranged in rows, each pocket designed to receive staples of specific metal types, simplifying the assembly of dissimilar metals.
Solution Approach 2:
The invention changes the material parameter (metal composition) of staples across different rows while maintaining consistent geometric and structural parameters. All staples share the same basic shape, size, and formation mechanism, but differ in metal composition (anodic index). This approach allows manufacturing to focus on consistent geometric formation while varying only the material parameter to achieve the voltaic cell effect.
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 dissimilar metal staples in the staple cartridge accelerates cell migration and wound healing by generating a voltage gradient, improving tissue integrity and reducing healing time.
Implementation Method 1
Each of the plurality of staples received in the inner rows of staple pockets is formed of a first metal having a first anodic index and each of the plurality of staples received in the outer rows of staple pockets is formed of a second metal having a second anodic index that is different from the first anodic index
Implementation Method 2
The first and second anodic indexes are selected to create a voltaic cell to drive a voltage within tissue to which the plurality of staples are applied
Data Source
AI summary
A staple cartridge is adapted to enhance cell migration towards a wound site when staples are placed in tissue. In order to enhance cell migration, the staples in the staple cartridge are adapted to create an electrical potential within the tissue in the area of a wound or cut line. More specifically, the staples are arranged in spaced rings, wherein the staples in the spaced rings are formed of dissimilar metals having different anodic indexes to create a voltage gradient in the tissue to enhance cell migration toward the cut line.