Concave Blade Puncture Needle for Lower Insertion Resistance
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Solution Overview
Problem
Existing puncture needles with blade surfaces formed by multiple angled surfaces face increased puncture resistance at the blade tip, making it difficult to alleviate pain during insertion and smooth vessel puncture, especially when the blade surface length is shorter.
Innovation Solution
A puncture needle design featuring a concave-shaped first blade surface portion that inclines relative to the central axis, with a second blade surface portion forming a blade edge, reducing the blade tip angle and incorporating a concave or flat surface configuration to minimize puncture resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the blade surface length is shortened to allow easy insertion into vessels, then the blade surface can be easily inserted into the vessel, but the blade tip angle becomes relatively large increasing puncture resistance
Solution Approach 1:
The first blade surface portion is configured as a concave surface that is concave in a side view of the main body, creating a curved geometry that reduces the blade tip angle. This curvature allows the blade tip to have a smaller angle even when the overall blade surface length is short, thereby reducing puncture resistance while maintaining easy insertion capability.
2Object-affected harmful factors
If multiple surfaces with different angles are used to reduce pain during puncture, then pain during puncture can be alleviated, but the blade tip angle becomes relatively large making it difficult to puncture vessels smoothly
Solution Approach 1:
The concave surface configuration of the first blade surface portion creates a progressive angle reduction from the proximal to distal end, allowing multiple effective cutting angles along the blade surface while maintaining a small blade tip angle. This curved geometry enables the blade to cut through tissue with reduced pain while still achieving smooth vessel puncture with low resistance.
Data Source
Figure 1(a)~1(d)
Figure 2(a)~2(b)
Figure 3
AI summary
The puncture needle according to the present disclosure is a medial puncture needle having a blade surface formed on a distal end portion of a rod-shaped main body, wherein the blade surface has a first blade surface portion that extends so as to incline with respect to a central axis of the main body, and a second blade surface portion that is formed on the back side of the first blade surface portion and that forms a blade edge having a needle tip as one end by a ridge line where the second blade surface portion meets the first blade surface portion. The first blade surface portion is constituted by a concave surface that is concave in a side view of the main body in which the first blade surface portion appears linear.