Diffusion-Hardened Endoscopic Instrument Contact Surfaces
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Solution Overview
Problem
Medical instruments, particularly those interacting with hard tissues or materials, face challenges in achieving a balance between surface hardness and biocompatibility, often leading to issues like wear, tear, and potential detachment of hard metal parts due to differing thermal expansion coefficients, which complicates manufacturing and increases costs.
Innovation Solution
Integrally manufacturing surgical or endoscopic instruments from austenitic stainless steel using a low-temperature carbon diffusion hardening process to enhance surface hardness without coatings, creating a near-surface diffusion zone that maintains ductility and biocompatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional surgical instruments with smooth surfaces are used, then manufacturing is simple, but bacteria and pathogens can adhere to and colonize the surface during surgery
Solution Approach 1:
The surgical instrument surface is equipped with a porous coating layer that has a specific pore size and distribution. This porous structure prevents bacterial adhesion and colonization while maintaining ease of manufacturing through conventional coating techniques. The porous material allows for controlled interaction with biological tissues while repelling pathogens.
Solution Approach 2:
The instrument combines a base material with a functional porous coating layer to create a composite structure. The base material provides mechanical strength and durability, while the porous coating layer provides infection-resistant properties. This composite approach allows each layer to optimize its function without compromising manufacturing simplicity.
2Reliability
If the surgical instrument surface is made rough or porous to prevent infection, then pathogen adhesion is reduced, but the surface area increases which may affect cleaning and sterilization
Solution Approach 1:
The porous structure is applied locally to specific regions of the instrument where pathogen adhesion is most problematic, rather than covering the entire surface uniformly. This localized approach maintains pathogen resistance where needed while minimizing the overall surface area complexity and facilitating easier cleaning and sterilization of other instrument portions.
Solution Approach 2:
The porous coating is designed with controlled pore size, density, and depth parameters that prevent pathogen adhesion while maintaining a relatively simple overall surface geometry. The porous structure is optimized to allow penetration of sterilization agents while blocking pathogen attachment sites.
3Reliability
If a porous coating is applied to the instrument surface, then bacterial adhesion is prevented, but the coating process becomes more complex
Solution Approach 1:
The mechanical coating process is replaced with a chemical or physical field-based process such as plasma treatment, electrostatic deposition, or sol-gel processing. These alternative methods create porous coatings with controlled structures without requiring complex multi-step mechanical application procedures, thereby maintaining sterility while simplifying the overall coating process.
Solution Approach 2:
The coating process parameters such as temperature, pressure, concentration, and deposition time are optimized to achieve the desired porous structure in a single step or minimal steps. By controlling key parameters like pore size, porosity percentage, and coating thickness, the process complexity is reduced while maintaining effective pathogen prevention.
Data Source
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AI summary
The invention relates to a surgical or endoscopic instrument comprising at least one elongated element (28, 30; 128; 228, 230; 328) with a length between a first end and a second end and comprising a support piece (50, 52; 150, 152; 250, 252; 350, 352; 410; 412; 414; 416) which has at least one structured contact section (60, 62; 160, 162; 260, 262; 360, 362; 420; 422; 424; 426) that is provided with a toothing or corrugation in particular, wherein the at least one structured contact section (60, 62; 160, 162; 260, 262; 360, 362; 420; 422; 424; 426) is integrated into the support piece (50, 52; 150, 152; 250, 252; 350, 352; 410; 412; 414; 416), the support piece (50, 52; 150, 152; 250, 252; 350, 352; 410; 412; 414; 416) and the at least one structured contact section (60, 62; 160, 162; 260, 262; 360, 362; 420; 422; 424; 426) consist of a corrosion-resistant steel material, in particular stainless steel, and the at least one structured contact section (60, 62; 160, 162; 260, 262; 360, 362; 420; 422; 424; 426) is diffusion hardened at a low temperature in the vicinity of the surface. The invention additionally relates to a method for producing a surgical or endoscopic instrument.