Curved Blade Surface Medical Puncture Needle Reducing Penetration Resistance
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Solution Overview
Problem
Conventional medical puncture needles with back-cut type blade surfaces face challenges in achieving sufficient blade edge length, leading to increased penetration resistance and patient discomfort due to the thinness of the planar back-cut surface, which limits the cutting edge's effectiveness.
Innovation Solution
A medical puncture needle design featuring a distal end with a blade surface comprising a first inclined blade surface portion, a second curved blade surface portion, and a third curved blade surface portion, where these portions intersect to form a ridgeline and provide a longer blade edge, reducing penetration resistance and enhancing comfort by distributing the cutting action more effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the thickness of the puncture needle is reduced, then the needle becomes thinner and less invasive, but the planar back-cut surface area decreases, making it difficult to provide a cutting edge with sufficient length to incise the skin effectively
Solution Approach 1:
The patent applies curvature to the blade surface by forming the back-cut surface as a curved surface rather than a flat plane. This curved configuration allows the blade edge to extend longer along the curved path while maintaining a thin needle profile, effectively increasing the cutting edge length without increasing the overall needle thickness. The curved blade surface creates a longer ridgeline that provides sufficient cutting edge for effective skin incision.
2Weight of moving object
If the planar back-cut surface is made smaller to maintain thin needle profile, then the needle remains thin, but the cutting edge length becomes insufficient, causing the outer surface of the needle to forcibly push the incision apart and cause patient pain
Solution Approach 1:
The curved blade surface extends the cutting edge length while maintaining thin needle profile, ensuring the cutting edge is sufficient to incise the skin without requiring the outer surface to forcibly push the incision apart. This eliminates the harmful effect of patient pain caused by inadequate cutting edge.
3Ease of manufacture
If a flat-cut surface and planar back-cut surface are used to form a linear cutting edge, then the blade edge is simple to manufacture, but the blade edge length is insufficient when the needle thickness is reduced
Solution Approach 1:
The patent forms the back-cut surface as a curved surface that can be manufactured using conventional grinding or polishing processes. The curvature is achieved by rotating the needle blank during the grinding process, allowing the formation of the curved blade surface with standard manufacturing equipment. This maintains ease of manufacture while significantly increasing the blade edge length compared to a flat planar surface.
Data Source
AI summary
A medical puncture needle includes: a distal end portion including a needle point; and a rod-like main body portion continuous with the distal end portion. The distal end portion includes a blade surface. The blade surface includes: a first blade surface portion on a front side of the distal end portion, the first blade surface portion being inclined with respect to a center axis of the main body portion and extending to the needle point, and a second blade surface portion on a back side of the distal end portion. When a virtual plane including the center axis of the main body portion is established, the second blade surface portion comprises a curved surface in which an angle with respect to the virtual plane in a cross section orthogonal to the center axis direction gradually increases toward the needle point side in the center axis direction.