Adjustable Needle Housing for Intradermal Injection Depth Control
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Solution Overview
Problem
Standard syringes with long needles are not suitable for intradermal injections, as they cannot easily access multi-use vials and require precise control, making them difficult to use for intradermal medication delivery, and existing solutions do not allow for a needle length suited for both vial filling and intradermal injection.
Innovation Solution
A needle adjusting member that can be fitted to a standard syringe, allowing it to be adapted for intradermal injections by shortening the needle length, enabling filling from multi-use vials and delivering medications to the intradermal region of the skin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a standard syringe with a long needle is used, then the syringe can aspirate drug from a vial, but it cannot easily deliver the drug to the intradermal region of the skin
Solution Approach 1:
The needle adjusting member is designed to be movable along the syringe body, allowing dynamic adjustment of the effective needle length. The member can be positioned at different locations to change the distance from the needle tip to the adjusting member, thereby adjusting the effective needle length from approximately 12mm to approximately 3mm to suit different injection depths
Solution Approach 2:
The invention changes the effective needle length parameter by introducing an adjustable component. The needle adjusting member can be moved to different positions along the syringe body, directly changing the effective length parameter of the needle assembly to adapt to different injection requirements (intradermal vs. subcutaneous)
2Ease of operation
If a needle with length suited for intradermal injection (0.5-3mm) is used, then intradermal delivery is facilitated, but standard vials cannot be used because the septum thickness is thicker than the needle length
Solution Approach 1:
The invention segments the needle system into two functional parts: the actual needle (for vial penetration) and the needle adjusting member (for depth control). The needle retains its full length to access multi-use vials, while the adjustable member creates the appropriate effective length for intradermal injection by positioning itself between the needle tip and the injection site
Solution Approach 2:
The needle adjusting member acts as an intermediary element between the needle and the skin. It mediates the conflict between needle length requirements for vial access versus injection depth control by providing an adjustable interface that can be positioned to create the appropriate effective needle length while allowing the full-length needle to reach the vial septum
3Adaptability or versatility
If a standard syringe is used for intradermal injection, then the syringe can be filled from multi-use vials, but precise control of penetration depth is difficult and the procedure is complicated
Solution Approach 1:
The adjustable member provides dynamic control over penetration depth. By moving the adjusting member to different positions along the syringe body, the user can precisely control the effective needle length and thus the penetration depth, transforming a static system into a dynamically adjustable one
Solution Approach 2:
The invention replaces the reliance on provider skill and manual depth estimation with a mechanical adjustment system. The needle adjusting member provides a physical, measurable means of controlling penetration depth, substituting mechanical precision for human skill variability
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A syringe (21 1) includes a syringe body (217) for receiving and administering a medicament. A needle (215) is received by the syringe body (217). A needle adjusting member (221) is movably disposed on the syringe body (217) between first and second positions. When the needle adjusting member (221) is in the first position, the needle (215) has a first length adapted to draw medicament into the syringe body (217). When the needie adjusting member (221) is in the second position, the needle (215) has a second length for injecting the medicament.