Surgical Knife Second Bevel Tip Geometry
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Solution Overview
Problem
Surgical knives, particularly those used in ophthalmic surgery, face challenges with thin blades that become less sturdy and prone to bending under pressure, compromising their sharpness and effectiveness.
Innovation Solution
The introduction of a second bevel near the tip of the blade adds strength while maintaining thinness, incorporating additional cutting surfaces that enhance sharpness and rigidity, characterized by a concave polygon cross-sectional shape with non-identical angles and intersecting planes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the blade is made thin to maintain sharpness, then the cutting sharpness is improved, but the blade becomes less sturdy and prone to bending under pressure
Solution Approach 1:
The patent applies a second bevel at a different angle dimension near the tip of the blade, creating a concave polygon cross-section. This dimensional change in the blade geometry adds structural strength in the tip region without increasing the overall blade thickness, thereby maintaining sharpness while improving sturdiness.
Solution Approach 2:
The second bevel is applied locally only near the tip region of the blade rather than along the entire blade length. This localized modification strengthens the critical tip area where cutting force is concentrated, while keeping the rest of the blade thin for maintaining sharpness and flexibility.
2Ease of operation
If the blade is made thin to reduce resistance during cutting, then the ease of operation is improved, but the blade becomes prone to bending and loses effectiveness
Solution Approach 1:
By introducing a second bevel at a different angular dimension near the tip, the blade achieves enhanced rigidity where needed without compromising the thin profile that enables easy cutting operation. The concave polygon cross-section provides structural support while maintaining operational ease.
3Manufacturing precision
If additional cutting surfaces are added to enhance sharpness, then the cutting effectiveness is improved, but the device complexity increases
Solution Approach 1:
The blade surface is segmented into multiple planes, with the second bevel creating additional cutting surfaces in the tip region. This segmentation provides multiple sharp edges for effective cutting while maintaining a relatively simple overall blade structure that is manufacturable using conventional techniques.
Data Source
AI summary
One or more wedges may be introduced into the bevel of a surgical knife near its tip, to thereby increase the bevel surface area of the knife, and thus increase the cutting edges of the knife, and render the knife more effective and/or easier to use in surgical applications such as ophthalmic procedures.