Medical Hollow Needle Blade Surface Design for Pain Reduction
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Solution Overview
Problem
Conventional medical hollow needles with blade surfaces featuring first to fifth inclined surfaces still experience increased puncture resistance from the tip to the base, leading to significant pain during needle insertion, as the resistance peaks at the intermediate portion.
Innovation Solution
A medical hollow needle with a blade surface design that includes a first inclined surface, second and third inclined surfaces with equal rotational angles in opposite directions, and fourth inclined surfaces with the same rotational angle as the first surface but larger inclination angles, which are placed between the first and second, and first and third surfaces to equalize puncture resistance along the needle length, reducing peak resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional blade surface design with first to fifth inclined surfaces is used, then the needle can penetrate tissue, but puncture resistance increases from tip to base causing significant pain during insertion
Solution Approach 1:
The blade surface is segmented into multiple inclined surfaces (first, second, third, fourth, and fifth inclined surfaces) with different inclination angles. Each segment handles a specific portion of the penetration process, distributing the puncture resistance across multiple zones rather than concentrating it in one area, thereby reducing peak resistance and pain perception.
Solution Approach 2:
Different regions of the blade surface are given different inclination angles tailored to their specific functions: the first inclined surface (10-15°) provides gradual initial penetration, the second and third inclined surfaces (20-30°) handle intermediate penetration, and the fourth and fifth inclined surfaces (15-25°) manage base portion penetration. This localized optimization of surface geometry minimizes pain at each stage of insertion.
2Ease of operation
If the blade surface has a simple structure with fewer inclined surfaces, then manufacturing is easier, but puncture resistance is not adequately reduced causing patient discomfort
Solution Approach 1:
The blade surface is divided into multiple inclined surfaces (first, second, third, fourth, and fifth) with specific inclination angles. This segmentation allows each surface to address a specific portion of the penetration process, optimizing pain reduction while maintaining a systematic manufacturing approach through defined geometric parameters.
Solution Approach 2:
The invention specifies precise inclination angle ranges for each surface (first: 10-15°, second/third: 20-30°, fourth/fifth: 15-25°) to optimize the balance between puncture comfort and manufacturing feasibility. These parameter definitions provide clear manufacturing targets while achieving the desired clinical outcome of reduced puncture pain.
Data Source
AI summary
A medical hollow needle structured in accordance with the present invention, wherein the puncture resistance of a blade surface over the entire length in the puncture direction can be made substantially equal, and the patient's pain during needle puncture can be relieved due to a reduction in the peak level of puncture pain with the duration of sensory awareness of the puncture pain shortened by the use of the blade surface in a novel shape employing, in combination with each other, first to fourth inclined surfaces having specific inclination directions. Accordingly, the present invention provides a medical hollow needle with a blade surface in a novel shape whereby the puncture pain can be further reduced compared to needles with a conventional structure, and to provide a preferred method of producing such a medical hollow needle.