Medical Needle Flat Puncture Tip Reduces Insertion Pain
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Solution Overview
Problem
Conventional medical needles face significant puncture resistance when penetrating a living body, leading to increased pain during the puncturing process.
Innovation Solution
A medical needle with a flat puncturing part featuring side-surface inclined parts and a front-surface inclined part, forming a tapered shape with a depression that partially indents these features, reducing puncture resistance and pain by facilitating easier insertion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional medical needle with ascending and descending regions is used, then frictional force is reduced and pain is lessened, but puncture resistance remains large during initial penetration
Solution Approach 1:
The needle tip geometry is changed from conventional circular cross-section to a flat puncturing part with specific inclined surfaces. The flat puncturing part has a first inclined surface, second inclined surface, and third inclined surface with specific angles, creating a planar cutting edge that reduces puncture resistance while minimizing pain through controlled tissue separation
Solution Approach 2:
The needle tip is designed with inclined surfaces that create a tapered geometry, transitioning from a flat base to a sharp edge. This curved/tapered structure allows gradual tissue displacement and reduction of puncture resistance, while the flat puncturing part provides a clean cutting action that reduces pain
2Strength
If the ascending region penetrates the living body, then frictional force increases, but the descending region reduces this friction and prevents cell damage
Solution Approach 1:
The needle maintains a substantially constant cross-sectional area along its length, eliminating the ascending and descending region geometry. The flat puncturing part with inclined surfaces provides consistent penetration capability throughout the needle shaft, reducing cell damage through a cleaner cutting action rather than progressive friction
Solution Approach 2:
The needle is divided into distinct functional regions: the flat puncturing part with inclined surfaces for initial penetration and cutting, and the substantially constant cross-sectional body for stable advancement. This segmentation allows each region to perform its specific function optimally without the drawbacks of conventional ascending/descending designs
Data Source
AI summary
A medical needle comprising a flat puncturing part having front and back surfaces that are parallel to each other, wherein the puncturing part comprises a pair of side-surface inclined parts and provided at tips of respective side surfaces and a front-surface inclined part provided at a tip of the front surface, the pair of side-surface inclined parts and the front-surface inclined part each extend in an inclined manner relative to a puncturing direction so as to be tapered, and the tip of the front-surface inclined part adjoins a blade edge part formed by adjoining the tips of the pair of side-surface inclined parts and a depression is formed in the front surface of the puncturing part so as to partially indent the pair of side-surface inclined parts and the front-surface inclined part.