Medical Knife Surface Design for Microscopic Surgery
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Solution Overview
Problem
Medical knives used in microscopic operations face challenges in reducing light reflection, which hinders the surgeon's view, and in maintaining cutting quality due to the formation of concavities and convexities on the surface, leading to increased friction and loss of sharpness.
Innovation Solution
A medical knife design featuring a cutting edge along the outer edge with a non-reflecting upper surface and a thinner, reflecting lower surface, where the cutting edge is formed along the outer edge of the blade portion, reducing friction resistance and light reflection by allowing the knife to advance from the upper to the lower portion when piercing tissue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the entire surface of the knife is composed of a non-reflecting surface to reduce light reflection, then the doctor can easily observe the affected area, but friction is increased between the concavities and convexities and the living body tissue, and the cutting quality is deteriorated
Solution Approach 1:
The knife surface is divided into two distinct regions: a non-reflecting surface region (with concavities and convexities) for reducing light reflection, and a smooth surface region for maintaining cutting quality. This local differentiation allows each surface area to optimize its function without compromising the other.
Solution Approach 2:
The knife blade surface is segmented into functionally distinct zones: the non-reflecting surface portion and the smooth surface portion. This segmentation enables independent optimization of light reflection properties and cutting performance in different areas of the same knife.
2Object-affected harmful factors
If only the slanting surface constituting the cutting edge is composed of a reflecting surface to reduce light reflection, then the amount of reflected light is reduced, but the cutting quality cannot be fully optimized
Solution Approach 1:
Different surface treatments are applied to different portions of the knife: the non-reflecting surface portion uses a textured finish for light diffusion, while the smooth surface portion maintains a polished finish for optimal cutting. This localized quality assignment resolves the contradiction between light reflection reduction and cutting quality.
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 design enhances cutting quality by minimizing friction resistance and light reflection, enabling precise incisions with self-closing properties, suitable for ophthalmic and other microscopic operations.
Implementation Method 1
The non-reflecting surface is composed of a surface on which fine concavities and convexities are formed so that the light, which is directly reflected to the eyes of the doctor, can be suppressed by diffusely reflecting the light.
Implementation Method 2
a cutting edge formed along an outer edge of a blade portion
Data Source
AI summary
A medical knife has a cutting edge formed along the outer edge of a blade portion, and the thickness of the lower portion located under a boundary acting as a surface including the cutting edge is made thinner than that of an upper portion located on the boundary, or a lower surface is composed of the surface including the cutting edge. The surface of the upper portion on the above surface including the cutting edge is composed of a first slanting surface constituting the cutting edge, a second reflecting surface, and a flat surface composed of a non-reflecting surface as well as the lower portion has a lower slanting surface 10 and a lower flat surface 11 each composed of a reflecting surface. With the above arrangement, the medical knife can reduce the amount of reflected light when an operation such as an ophthalmic operation is executed under a microscope.