Stripping Knife Guide Face Prevents Over-Cutting
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Solution Overview
Problem
Surgical knives used for stripping tissues, such as the golf knife, often require blunting to prevent cutting too deeply, leading to rough surfaces and the need for excessive force, especially when handling delicate tissues like the sclera or blood vessel walls.
Innovation Solution
A stripping knife with a plate-shaped blade featuring a cutting edge at the periphery and a guide face between the cutting edge and the blade surface, which inclines relative to the shank axis, allowing for precise manipulation and preventing over-cutting by maintaining the cutting edge above a line defined by the guide face, ensuring a smooth surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the cutting edge is made sharp, then cutting precision is improved, but the risk of cutting too deeply increases
Solution Approach 1:
The guide face acts as an intermediary element between the cutting edge and the tissue. It provides a reference surface that limits the maximum depth of cutting by preventing the cutting edge from penetrating beyond a certain point, thus mediating between the sharp cutting edge and the tissue to prevent over-cutting
Solution Approach 2:
The guide face enables the knife to self-regulate its cutting depth through geometric constraint. As the guide face contacts the tissue surface, it automatically prevents further depth penetration, allowing the knife to control its own cutting depth without requiring external intervention or complex depth adjustment mechanisms
2Object-affected harmful factors
If the knife edge is blunted to prevent over-cutting, then cutting depth control is improved, but the cutting edge becomes less sharp
Solution Approach 1:
The knife blade is segmented into two distinct functional zones: the cutting edge for sharp incision and the guide face for depth control. This segmentation allows each zone to optimize its specific function - the cutting edge remains sharp for precise cutting while the guide face provides geometric depth limitation, eliminating the need to compromise overall sharpness
3Object-affected harmful factors
If a golf knife with blunted edge is used for stripping sclera, then over-cutting is prevented, but excessive force is required and surface roughness increases
Solution Approach 1:
The guide face serves as a mediator that provides geometric constraint and depth limitation. By contacting the tissue surface, it guides the cutting action and prevents excessive force application, thereby mediating between the user's manipulation and the tissue to maintain both safety and operational ease
Solution Approach 2:
The invention changes the geometric parameters of the blade by introducing the guide face with specific inclination angles. This parameter change creates a mechanical constraint system that naturally limits cutting depth and distributes force more evenly, transforming the manipulation characteristics from requiring excessive force to providing controlled, smooth stripping action
Data Source
Figure 1
Figure 2
Figure 3(a)~3(b)
AI summary
[Problems] To ensure the sharpness of a stripping knife whereby a part of a living tissue is incised and stripped while preventing a cut along the thickness direction. [Means for Solving Problems] A stripping knife (A) having a plate-shaped blade (3) having an edge (1) around the periphery, a shank (5) connected to the blade (3), and a handle (7) holding the shank (5) in the integrated state, wherein the blade (3) is composed of the edge (1) formed at the front end and a guide face (2) which is formed between the edge (1) and the front face (3b) of the connected plate constituting the blade (3) and brought into contact with the surface (13) of the remaining tissue.