Puncture Needle Blade Tip Angle Reduction via Segmented Surface
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Solution Overview
Problem
Conventional puncture needles with blade surfaces formed by connecting surfaces of different angles struggle to reduce blade tip angle regardless of blade surface length, leading to increased puncture resistance and difficulty in smoothly piercing vessel walls.
Innovation Solution
A puncture needle design featuring a blade surface with a first and second blade surface portion forming a needle tip by a ridge line, and a third blade surface portion that is contiguous with these portions and constituted by a single flat surface inclined with respect to the central axis, allowing the line extending along the third blade surface to intersect with one of the blade surface portions, thereby reducing the blade tip angle.
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 cannot be reduced and tends to be relatively large, increasing puncture resistance
Solution Approach 1:
The blade surface is divided into three distinct portions (first, second, and third blade surface portions) with different inclination angles. The first and second portions form the blade edge with a relatively small inclination angle, while the third portion has a larger inclination angle. This segmentation allows the blade tip angle to be reduced while maintaining a short overall blade surface length, as each portion contributes differently to the overall geometry.
Solution Approach 2:
Different portions of the blade surface are given different local qualities in terms of inclination angles. The first and second blade surface portions have smaller inclination angles to reduce the blade tip angle and puncture resistance, while the third portion has a larger inclination angle to provide structural support. This local differentiation resolves the contradiction between short blade length and small blade tip angle.
2Object-affected harmful factors
If multiple surfaces with different angles are connected to reduce puncture resistance at ridge lines, then pain during puncture is alleviated, but the blade tip angle remains relatively large when blade surface length is short
Solution Approach 1:
The blade surface is segmented into three portions with progressively different inclination angles. The first and second portions have smaller angles that reduce puncture resistance at their junction, while the third portion has a larger angle. This segmentation strategy simultaneously addresses both the reduction of ridge line puncture resistance and the control of blade tip angle.
Solution Approach 2:
The inclination angles of different blade surface portions are carefully controlled within specific ranges. The first and second portions have inclination angles of 10° to 30° relative to the central axis, creating a smaller blade tip angle. The third portion has a larger inclination angle, and the specific parameter control allows optimization of both puncture resistance and blade tip geometry.
3Shape
If the blade tip angle is reduced to lower puncture resistance, then easier insertion is achieved, but the blade surface length increases making insertion more difficult
Solution Approach 1:
By segmenting the blade surface into three portions with different inclination angles, the design achieves a reduced blade tip angle through the first and second portions while the third portion compensates by having a larger inclination angle. This segmentation allows the overall blade surface length to remain short while the blade tip angle is reduced, resolving the contradiction between these two parameters.
Solution Approach 2:
The local quality of inclination angle is optimized at different portions of the blade surface. The first and second portions have smaller inclination angles to reduce the blade tip angle, while the third portion has a larger inclination angle to maintain structural integrity. This local quality differentiation enables short blade surface length with reduced blade tip angle.
Data Source
AI summary
A puncture needle includes: a rod-shaped main body; and a blade surface located at a distal end portion of the main body, which includes: first, second, and third blade surface portions. The first blade surface portion and the second blade surface portion form a blade edge at a ridge line where the first blade surface portion and the second blade surface portion meet, wherein a needle tip is located at a distal end of the blade edge. The third blade surface portion is contiguous with a proximal side of at least the first blade surface portion, and the third blade surface portion is a single flat surface that is inclined with respect to a central axis of the main body. In a side view of the main body, a line extending along the third blade surface portion intersects with the first blade surface portion.