Intradermal Pen Adapter for Precise Cannula Placement
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Solution Overview
Problem
Intradermal injections are challenging due to the need for precise placement of the cannula, requiring skilled professionals and often resulting in failed injections, medicament wastage, and discomfort, especially when administered by unskilled personnel.
Innovation Solution
An intradermal injection adapter with a cannula channel and a distal protrusion that allows for parallel alignment with the skin, providing visual confirmation of cannula placement and ensuring the tip is positioned in the dermal layer, reducing the risk of incorrect insertion and medicament wastage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a standard cannula is used for intradermal injection, then the injection can be administered, but the placement precision is difficult to achieve and requires skilled professionals
Solution Approach 1:
The patent introduces an adapter as an intermediary component between the syringe and the patient's skin. The adapter includes a flange that contacts the skin surface and a cannula holder that positions the cannula at a precise angle (10-15 degrees) relative to the skin. This intermediary device eliminates the need for the administrator to manually control the injection angle and depth, thereby improving placement precision while reducing operational difficulty.
Solution Approach 2:
The adapter is pre-configured with the cannula held at the correct injection angle and depth before the injection procedure begins. The flange is positioned to contact the skin surface at the desired location, and the cannula is pre-positioned at the optimal angle (10-15 degrees) relative to the skin surface. This preliminary setup ensures that when the injection is administered, the cannula is already in the correct position, eliminating the need for real-time angle adjustment by the administrator.
2Reliability
If the cannula is inserted at incorrect angle or depth, then the injection may fail or deliver compound to wrong layer, but achieving correct placement is difficult without specialized training
Solution Approach 1:
The adapter serves as a mechanical intermediary that enforces the correct injection geometry. The flange contacts the skin surface and the cannula holder maintains the cannula at a fixed angle (10-15 degrees) relative to the skin. This mechanical constraint ensures that the cannula cannot be inserted at incorrect angles or depths, thereby improving reliability without requiring the administrator to master complex techniques.
Solution Approach 2:
The adapter is designed to be self-aligning and self-positioning. The flange naturally contacts the skin surface at the desired location, and the cannula holder automatically maintains the correct angle. The device performs the positioning function for itself without requiring the administrator to have specialized training or to perform complex manual adjustments, thereby improving reliability while reducing technique complexity.
3Loss of substance
If intradermal injection is performed without proper positioning aids, then the procedure can be attempted, but medicament wastage occurs due to incorrect placement
Solution Approach 1:
The adapter acts as a positioning intermediary that ensures the cannula is correctly placed in the dermal layer before medicament injection. The flange contacts the skin surface and the cannula holder maintains the optimal angle and depth, ensuring that the medicament is delivered to the correct tissue layer. This prevents wastage due to incorrect placement while maintaining procedural simplicity.
4Adaptability or versatility
If the injection is administered by unskilled personnel, then accessibility is improved, but placement accuracy deteriorates
Solution Approach 1:
The adapter serves as a mechanical intermediary that compensates for the lack of skill in the administrator. The device includes a flange that contacts the skin surface and a cannula holder that maintains the cannula at a precise angle (10-15 degrees) relative to the skin. This mechanical guidance system allows unskilled personnel to achieve accurate placement that would otherwise require specialized training, thereby improving adaptability without sacrificing precision.
Solution Approach 2:
The adapter performs the positioning function automatically without requiring the administrator to have specialized skills. The flange naturally contacts the skin surface at the desired location, and the cannula holder automatically maintains the correct angle and depth. This self-positioning capability allows any administrator, regardless of skill level, to achieve consistent and accurate placement, thereby improving versatility while maintaining precision.
Data Source
Figure 1
Figure 2~2A
Figure 3
AI summary
An intradermal injection adapter (10) includes a body (16) having a longitudinal axis and a central portion (24) located distally relative to the body along the longitudinal axis (18). The central portion has a cannula channel therethrough extending generally parallel to the longitudinal axis. A cannula (14) within the cannula channel (26) has a sharpened tip (14a) for injection into a patient and a sharpened opposite proximal end for injection into a pen injector. A distal protrusion (30) has a first skin contacting surface (34) extending generally parallel to the longitudinal axis. The first skin contacting surface is spaced from the cannula such that a distal portion of the cannula extends generally parallel to the first skin contacting surface.