Hypodermic Needle Hub with Expanded Contact Surface
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Solution Overview
Problem
Conventional hypodermic injection needles cause increased pain during self-injection due to their small surface area, leading to deeper penetration into tissue than necessary, resulting in discomfort for patients.
Innovation Solution
Designing the needle hub with a larger contact surface area (≥10 mm²) to distribute pressure evenly, limiting penetration depth and reducing nerve stimulation, while maintaining the ability to be securely attached to a syringe or injection device for sterile packaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the needle hub has a small surface area (conventional design), then the device structure remains compact and simple, but the needle penetrates deeper into tissue causing increased pain sensation
Solution Approach 1:
The patent changes the geometric parameter of the needle hub by increasing its surface area to at least 6 mm² (preferably at least 10 mm²). This parameter change distributes the pressing force over a larger area, reducing pressure intensity at any single point, thereby limiting penetration depth and reducing pain sensation during injection.
2Object-affected harmful factors
If the needle hub surface area is increased to reduce pain, then pressure distribution improves and penetration depth is limited, but the device dimensions increase
Solution Approach 1:
The patent specifies that while the surface area should be at least 6 mm² (preferably at least 10 mm²), the diameter should remain at most 12 mm. This controlled parameter change achieves the dual goal of increasing surface area for better pressure distribution while constraining the overall dimension to maintain device compactness and usability.
Data Source
Figure 1a~5b
Figure 6a~9
AI summary
The invention relates to a subcutaneous injection needle comprising a hollow needle that is fixed in a needle hub on both sides, wherein one end with the needle hub projects from the end wall of a sleeve that can be screwed or pushed onto a connecting piece of a tip and that at least partially surrounds the other end of the hollow needle, and wherein, when the sleeve is fixed to the connecting piece, the end located in the sleeve pierces a rubber membrane of the syringe that forms at least part of the end surface of the connecting piece, wherein, when the subcutaneous injection needle is used, the end surface is the contact surface of the needle hub and rests against the skin. The contact surface of the needle hub that rests against the skin is at least 6 mm² in size.