Injection Needle Assembly Stabilizing Section Skin Contact
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Solution Overview
Problem
Existing injection devices with short needle projection lengths face difficulties in puncturing the skin with consistent force and accuracy, especially when administered by users with varying skill levels, leading to unreliable drug delivery in the upper layer of skin.
Innovation Solution
The injection needle assembly and drug injection device incorporate a needle tube with a stabilizing section and a puncture speed securing member that ensures the needle tip is punctured swiftly and accurately in the upper layer of skin by regulating the depressing force and speed, using a hub with an adjustment section and a stabilizing section that contacts the skin, and a puncture speed securing member that moves axially to assist in the puncture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the needle projection length is reduced to minimize skin damage and ensure upper layer penetration, then the needle can reliably reach the upper layer of skin, but the puncturing force and speed become insufficient for reliable skin penetration
Solution Approach 1:
The stabilizing section is pressed against the skin surface before the needle tip reaches it, creating a preliminary action that stabilizes the needle position and prepares the skin for puncture. This preliminary stabilization allows the needle to deliver controlled puncturing force even with short projection length
Solution Approach 2:
The stabilizing section acts as an intermediary element between the needle tip and the skin. It provides a stable contact point that mediates the force transmission from the needle to the skin, ensuring reliable puncture despite the short needle projection length
2Object-affected harmful factors
If the needle projection length is reduced to minimize skin damage, then the needle can be inserted with less force, but the user cannot recognize the depressing force at which the needle is punctured
Solution Approach 1:
The stabilizing section provides tactile feedback to the user by contacting the skin first during insertion. This feedback mechanism allows the user to感知 (perceive) the depressing force at which the needle is punctured, even when the needle projection length is short and minimizes skin damage
3Measurement precision
If the needle projection length is reduced to ensure precise upper layer targeting, then the needle reaches the target more accurately, but the puncturing speed becomes insufficient
Solution Approach 1:
The stabilizing section performs a preliminary action by contacting and stabilizing the skin before the needle tip reaches the target. This preliminary stabilization enables the needle to achieve precise targeting while maintaining sufficient puncturing speed through the stabilized force transmission path
4Ease of manufacture
If a single needle method is used to administer vaccine in upper layer skin, then the production cost and administration simplicity are improved, but the administration difficulty increases due to skill requirements
Solution Approach 1:
The stabilizing section enables the needle assembly to self-stabilize on the skin surface through its own weight and geometric configuration. This self-stabilization reduces the skill requirement for administration while maintaining the simplicity and cost-effectiveness of the single needle method
Solution Approach 2:
The invention changes the geometric parameters of the needle assembly by adding a stabilizing section with specific dimensional characteristics. This parameter change enables the needle to automatically stabilize on the skin, reducing administration difficulty while maintaining manufacturing simplicity
Data Source
AI summary
Objects are to ensure a required depressing force and puncture speed when a needle tube is punctured in the skin, and to be able to reliably situate a needle tip of a needle tube in the upper layer of skin. A needle injection assembly 2 includes a needle tube 5 having a needle tip 8 that can be punctured in a living body, a hub 6 that holds the needle tube 5, an adjustment section 12, a stabilizing section 13, and a puncture speed securing member 7. The adjustment section 12 is provided around the periphery of the needle tube 5 and has a needle projection surface 12a, from which the needle tip 8 of the needle tube 5 projects. The stabilizing section 13 extends from the hub 6, is disposed to surround the needle tube 5 and has an end face 13a that comes in contact with the skin when the needle tube 5 is punctured in the living body. The puncture speed securing member is provided at the adjustment section 12 or stabilizing section 13 such that the puncture speed securing member moves along the axial direction of the needle tube 5. The puncture speed securing member 7 is brought into contact with the skin ahead of the needle tip 8 of the needle tube 5 when the needle tube 5 is punctured in the living body and ensures the speed and depressing force as desired when the needle tube 5 is punctured in the living body.