Surgical Stapler Surface Coatings for Sliding Wear Resistance
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Solution Overview
Problem
Surgical staplers face challenges with complex mechanisms that lead 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 multiple triggers and handles with complex mechanisms are used to ensure proper tissue positioning and stapling, then the stapling function is improved, but the device complexity and manufacturing burden increase
Solution Approach 1:
The patent extracts and eliminates unnecessary complex mechanisms (multiple triggers and handles) from the surgical stapler, retaining only the essential firing mechanism while maintaining reliable stapling function through simplified design
Solution Approach 2:
The patent replaces complex mechanical mechanisms with a simplified mechanical system that uses a single trigger and handle assembly, reducing device complexity while preserving the core stapling functionality
2Strength
If metallic components in sliding contact are used in clamping and firing mechanisms, then the mechanical strength is improved, but wear degradation occurs over multiple firing cycles
Solution Approach 1:
The patent applies composite material construction by combining metallic substrate with ceramic coating layers, creating a composite surface that provides both mechanical strength from the metal and wear resistance from the ceramic coating
Solution Approach 2:
The patent changes the surface properties of metallic components by applying ceramic coatings, transforming the surface parameters to achieve enhanced wear resistance while maintaining the bulk mechanical properties of the metal
3Ease of operation
If sliding components are used in the firing mechanism, then the ease of operation is improved, but frictional wear increases over multiple firing cycles
Solution Approach 1:
The patent uses composite material construction with ceramic coatings on sliding surfaces to reduce frictional wear while maintaining smooth operation of the firing mechanism
Solution Approach 2:
The patent introduces ceramic coating layers as intermediary surfaces between sliding metallic components, reducing direct metal-to-metal contact and thereby minimizing frictional wear while preserving operational smoothness
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
sliding components experience wear degradation over multiple firing cycles
Implementation Method 2
a dry film surface coating disposed on the metallic substrate, and 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.