Puncture Needle Blade Surface Geometry for Reduced Insertion Resistance
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Solution Overview
Problem
Conventional puncture needles often have cutting edges that are not sharp enough or insufficiently long, leading to increased insertion resistance when penetrating skin or tissue.
Innovation Solution
A puncture needle design featuring a blade surface portion with inclined front-side blade surfaces and parallel or converging back-side blade surfaces that form sharp, extended cutting edges, ensuring a sufficient length for smooth skin and tissue penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional puncture needle designs are used, then the structure is simple and easy to manufacture, but the cutting edge cannot be sharpened sufficiently or the length of the cutting edge is insufficient, leading to increased insertion resistance
Solution Approach 1:
The blade surface is divided into multiple distinct portions: a first blade surface portion, a second blade surface portion, and a third blade surface portion. Each portion serves a specific function in forming the cutting edge, allowing for precise control over the cutting edge geometry and length while maintaining manufacturability through segmented design
Solution Approach 2:
Different portions of the blade surface are given different orientations and functions. The first blade surface portion forms one side of the cutting edge, the second blade surface portion forms the other side, and the third blade surface portion extends the cutting edge length. This local differentiation allows each area to contribute optimally to cutting performance
2Ease of operation
If the cutting edge length is increased to reduce insertion resistance, then the insertion resistance decreases, but the device complexity increases due to additional blade surface portions
Solution Approach 1:
The first, second, and third blade surface portions are merged into a continuous blade surface structure that forms an integrated cutting edge. This merging allows the cutting edge to extend sufficiently long while maintaining a unified structural design that can be manufactured as a single component, reducing overall device complexity
Data Source
AI summary
A puncture needle includes: a rod-shaped main body; a blade surface portion formed at a distal end of the main body, the blade surface portion including a front-side blade surface extending so as to be inclined with respect to an axis of the main body; a planar first back surface portion formed on a back surface side of the front-side blade surface at the distal end of the main body; and a planar second back surface portion formed on the back surface side of the front-side blade surface at the distal end of the main body. The first back surface portion and the second back surface portion are parallel to the axis or come closer to each other toward a needle tip, and do not intersect with each other at the needle tip.