Injection Needle Stabilizer for Precise Skin Layer Positioning
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Solution Overview
Problem
Existing injection devices struggle to securely position the needle tip and blade face in the upper layer of skin, leading to inconsistent drug administration, particularly in varying skin thicknesses and ages, and lack clear feedback on pressing force, making it difficult to administer vaccines effectively.
Innovation Solution
An injection needle assembly with a stabilizer and guide portion that forms a raised skin portion and recognizes the press-in distance, ensuring consistent insertion depth and providing tactile feedback on pressing force, thereby securely positioning the needle tip in the upper skin layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the needle tube is inserted into the skin without a stabilizer and guide portion, then the operation is simple, but the needle tip cannot be securely positioned in the upper layer of skin
Solution Approach 1:
The stabilizer serves as an intermediary component between the needle tube and the skin. It has a skin-contacting surface that presses against the skin to form a raised portion, and a tube hole through which the needle tube passes. This intermediary structure enables precise positioning of the needle tip in the upper layer of skin while maintaining relatively simple device construction.
2Manufacturing precision
If the stabilizer closely contacts the needle tube, then the structure is compact, but the skin cannot be properly raised for consistent insertion depth
Solution Approach 1:
The stabilizer is divided into distinct functional segments: a skin-contacting surface for pressing against the skin, a tube hole for accommodating the needle tube, and a guide portion for providing tactile feedback. This segmentation allows the stabilizer to perform multiple functions simultaneously - raising the skin for consistent insertion depth while maintaining a compact overall structure.
3Loss of information
If no guide portion is provided, then the device is simpler, but the user lacks feedback on pressing force applied to the skin
Solution Approach 1:
The guide portion protrudes from the stabilizer and provides tactile feedback to the user during the injection process. When the stabilizer presses against the skin to form a raised portion, the guide portion allows the user to sense the pressing force being applied. This feedback mechanism helps the user apply appropriate force without requiring complex electronic sensors or indicators.
4Manufacturing precision
If the needle protrudes too far from the stabilizer, then insertion is easier, but the needle tip may reach subcutaneous tissue instead of upper layer skin
Solution Approach 1:
The stabilizer performs preliminary action by pressing against the skin to form a raised portion before the needle tube is fully inserted. This pre-raising of the skin ensures that when the needle is inserted through the tube hole, the needle tip reaches the correct depth in the upper layer of skin. The guide portion also provides preliminary guidance to ensure proper alignment and depth control during insertion.
Data Source
AI summary
To securely position a needle tip and a blade face of a needle tube inserted into the skin in a predetermined site of a living body, such as the upper layer of skin, an injection needle assembly includes a needle tube having a needle tip capable of puncturing a living body, a hub holding the needle tube, a stabilizer, and a guide portion. The stabilizer is formed in a tubular shape surrounding the circumference of the needle tube, and an end face is pressed against the skin, and thereby a raised portion of the skin is formed in a tube hole. The guide portion is arranged on the stabilizer, and is adapted to recognize a press-in distance y of the stabilizer to the skin.