Medical Puncture Needle Blade Geometry for Lower Piercing Resistance
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Solution Overview
Problem
Conventional medical puncture needles with multi-sided blade surfaces struggle to reduce the blade tip angle, leading to increased piercing resistance and discomfort during vessel puncture, especially when the blade surface length is short, making it difficult to smoothly penetrate vessel walls without causing damage.
Innovation Solution
A medical puncture needle design featuring a blade surface with a first and second blade surface portion forming a needle tip by intersecting ridge lines, where at least one of these portions extends closer to the proximal end than the intermediate position, and a connecting blade surface portion, which reduces the blade tip angle by minimizing the formation of large steps and enhancing smooth penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a puncture needle has a short blade surface length in the central axis direction, then the entire blade surface can easily enter the vessel, but the blade tip angle becomes relatively large, increasing piercing resistance
Solution Approach 1:
The patent transitions from a conventional single-plane blade surface to a multi-dimensional stepped blade surface structure. By introducing multiple blade surface portions (first, second, third portions) at different heights and angles, the design reduces the blade tip angle in the lateral dimension while maintaining an appropriate blade surface length in the axial dimension. This dimensional transformation allows the blade tip to be sharper without requiring a longer overall blade surface.
Solution Approach 2:
The blade surface is segmented into multiple distinct portions (first blade surface portion, second blade surface portion, third blade surface portion) separated by ridge lines. Each segment serves a specific function: the first and second portions form the cutting edge at different heights, while the third portion provides additional support and control. This segmentation enables independent optimization of each portion's geometry to achieve the desired blade tip angle.
2Device complexity
If a puncture needle has a large blade tip angle, then the structure is simpler, but the piercing resistance increases and it is difficult to smoothly pierce the vessel wall
Solution Approach 1:
The patent introduces a stepped configuration with blade surface portions at different heights (first, second, and third portions), creating a multi-level structure that reduces the blade tip angle without significantly increasing overall complexity. The stepped design allows the cutting edge to approach the vessel wall at a more gradual angle, reducing piercing resistance while maintaining structural feasibility.
Solution Approach 2:
Different portions of the blade surface are given different geometric properties: the first and second blade surface portions form the primary cutting edge with specific angles, while the third blade surface portion provides additional support. Each local region is optimized for its specific function, allowing the blade tip to have low piercing resistance while the overall structure remains manageable.
3Object-affected harmful factors
If a puncture needle has multiple surfaces with different angles, then the piercing resistance from ridge lines is reduced, but the blade tip angle remains large when blade surface length is short
Solution Approach 1:
The patent adds a vertical dimension to the blade surface design by creating first, second, and third blade surface portions at different heights along the central axis. This vertical stratification allows the formation of multiple ridge lines at different positions, which work together to reduce both the blade tip angle and the harmful effects of individual ridge lines during puncture.
Solution Approach 2:
The blade surface is divided into multiple segmented portions (first, second, third blade surface portions) separated by ridge lines. Each segment is positioned at a different height and angle, creating a progressive cutting action. The segmentation allows each portion to contribute differently to the piercing process, reducing the overall blade tip angle while distributing the ridge line effects across multiple levels.
Data Source
Figure 1(a)~1(d)
Figure 2(a)~2(b)
Figure 3(a)~3(e)
AI summary
A medical puncture needle according to the present invention is a medical puncture needle in which a blade surface is formed at a distal end portion of a rod-shaped main body portion, wherein the blade surface includes a first blade surface portion and a second blade surface portion which form a blade edge having a needle tip as one end by ridge lines intersecting with each other on a distal end side, and at least one blade surface portion of the first blade surface portion and the second blade surface portion is made up of a plane, and the at least one blade surface portion extends to be closer to a proximal end side of the main body portion than an intermediate position in a central axis direction of the main body portion of a blade surface region in which the blade surface is formed.