Surgical Stapler Sliding-Surface Coatings for Galling Wear Resistance
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Solution Overview
Problem
Surgical staplers face challenges with complex mechanisms leading to increased manufacturing burdens and potential device failure, as well as user confusion, and sliding components experience wear degradation over multiple firing cycles.
Innovation Solution
The surgical stapling instrument features a metallic substrate with a dry film surface coating and a bone wax layer on the sliding components, such as the jaws and firing member, to enhance durability and reduce frictional wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex mechanisms with multiple triggers and handles are used to ensure proper tissue positioning and stapling, then stapling reliability is improved, but device complexity and manufacturing burden increase
Solution Approach 1:
The patent extracts the essential function of tissue positioning and stapling from complex multi-component mechanisms and implements it through a simplified single-jaw design with integrated firing member and reload cartridge system, eliminating unnecessary triggers and handles while maintaining stapling reliability
Solution Approach 2:
The single jaw assembly serves multiple functions including tissue clamping, positioning, and stapling through its integrated design with the firing member and reload cartridge, replacing what would traditionally require multiple separate mechanisms
2Strength
If metallic components are used in sliding contact for the firing mechanism, then structural strength is improved, but wear degradation occurs over multiple firing cycles
Solution Approach 1:
The patent applies a composite structure combining a metallic substrate with a dry film coating layer, where the metal provides structural strength and the dry film coating provides wear resistance and low friction, creating a multi-layer composite material system that addresses both requirements
Solution Approach 2:
The patent changes the surface properties of the metallic component by applying a dry film coating that modifies friction and wear characteristics while maintaining the underlying metal's structural integrity, effectively changing the surface parameter without altering the bulk material
3Ease of operation
If sliding components are used in the firing mechanism, then ease of operation is improved, but frictional wear increases over time
Solution Approach 1:
The dry film coating acts as an intermediary layer between the sliding metallic surfaces, reducing direct metal-to-metal contact and friction, thereby improving ease of operation while minimizing frictional wear and energy loss
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 minimizes performance degradation and galling wear, allowing the stapler to be reused with multiple reload cartridges without significant frictional force increases, ensuring reliable operation and patient safety.
Implementation Method 1
a dry film surface coating disposed on the metallic substrate
Implementation Method 2
a bone wax layer disposed on the dry film surface
Implementation Method 3
a case hardened metallic substrate
Data Source
AI summary
Surface preparation for sliding surfaces can enhance wear performance for surgical instruments such as surgical staplers which include reusable mechanisms that are used multiple times with single use reload cartridges. To reduce the potential for galling wear in a metal-to-metal sliding engagement, a combination of surface hardening, surface finish, and surface coatings can be applied to metallic components of a surgical instrument. Surface hardening techniques can allow further manufacturing operations such as welding without compromising the strength of the underlying metal substrate. With stainless steel metal substrates, as surface or case hardening techniques can reduce corrosion resistance, a surface coating can be applied to inhibit surface oxidation as well as provide a barrier to metal-to-metal contact. A further lubricious coating layer such as a bone wax coating layer can enhance galling resistance.