Injection Syringe Adapter for Consistent Needle Penetration Depth
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Solution Overview
Problem
Existing syringe devices lack effective mechanisms to consistently control the depth of needle penetration into the skin for precise drug delivery, particularly for subcutaneous injections, and often result in inconsistent injection depths due to variations in user technique.
Innovation Solution
A syringe assembly with a distal end configuration that includes a convex or concave profile and an adapter with a radially extending flange or post to control the depth of needle penetration by shaping the skin deformation, ensuring consistent and controlled insertion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the needle length is increased to ensure penetration through the septum, then the reliability of injection is improved, but the risk of needle bending increases
Solution Approach 1:
The device is divided into distinct functional segments: a support structure with a broad base for stable placement on the skin, a needle holder section, and the needle itself. This segmentation allows the support structure to provide stability while the needle performs its penetration function, reducing the risk of needle bending during injection.
Solution Approach 2:
The support structure is designed to be placed on the patient's skin before needle insertion. This preliminary positioning establishes a stable base that guides the needle along a predetermined path, ensuring consistent penetration depth and angle while preventing needle deviation or bending during the injection process.
2Manufacturing precision
If the hub distal face is made large to contact the skin, then the control of penetration depth is improved, but the complexity of the device structure increases
Solution Approach 1:
The hub is designed with locally differentiated features: a broad distal face for skin contact and penetration depth control, a narrower midsection for structural efficiency, and a specific interface for needle attachment. This local variation in dimensions allows the device to achieve precise depth control without requiring complex mechanisms throughout the entire structure.
Solution Approach 2:
The distal face of the hub incorporates a curved or contoured surface that contacts the skin. This curvature allows the hub to conform to the skin surface, providing stable contact and consistent penetration depth control while maintaining a relatively simple overall hub structure that is easy to manufacture.
3Ease of operation
If the needle is inserted at an angle to the skin surface, then the ease of insertion is improved, but the precision of target depth delivery is reduced
Solution Approach 1:
The support structure features an asymmetric design with a broad base that contacts the skin at a specific angle. This asymmetric geometry guides the needle to insert at the optimal angle for both ease of insertion and precise target depth delivery, eliminating the need for the user to manually adjust the insertion angle while maintaining high precision.
Solution Approach 2:
The support structure acts as an intermediary between the user's hand and the needle. It provides a stable platform that translates the user's insertion force into a controlled, angled motion, making insertion easier while ensuring the needle reaches the precise target depth without deviation.
Data Source
AI summary
A syringe assembly includes a syringe barrel having a proximal end and a distal end, a needle hub supporting the needle and coupled to the distal end of the syringe barrel. An adapter is coupled to the hub where the needle extends from the adapter to define a length of the needle for injection as substance into the patient. The adapter has a diameter greater than a diameter of the syringe and has a distal face with a shape and dimension configured for controlling the depth of penetration of the needle into the patient and a proximal face forming a finger grip.