Syringe Adaptor Septum Housing for Needle Containment and Sealing
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Solution Overview
Problem
Exposure of the distal end of a needle during fluid transfer poses a hazard due to potential leakage of fluid and the need for safe containment of the needle during withdrawal.
Innovation Solution
A syringe adaptor with a body lumen of variable radius and a septum housing with radially-flexible legs that lock onto circumferential ridges of a fluid-port adaptor, ensuring the needle remains contained and sealed throughout the transfer process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the needle is exposed during fluid transfer, then fluid can be transferred freely, but fluid leakage and safety hazards increase
Solution Approach 1:
The elastomeric septum acts as an intermediary between the needle and the external environment, allowing fluid to pass through while blocking leakage. The septum is positioned at the interface where the needle enters the adaptor body, creating a sealed pathway that enables fluid transfer without exposing the needle to the outside.
Solution Approach 2:
The elastomeric septum is a flexible thin film that deforms to accommodate the needle passage while maintaining its sealing function. Its elastic properties allow it to flex around the needle during insertion and withdrawal, ensuring continuous containment of the fluid and preventing leakage throughout the operation.
2Device complexity
If the needle is exposed during withdrawal, then the adaptor structure is simpler, but needle safety and containment are compromised
Solution Approach 1:
The septum is pre-positioned within the adaptor body at the expected needle entry location before the needle is inserted. This preliminary positioning ensures that when the needle is withdrawn, the septum is already in place to immediately contain and seal around the needle, maintaining safety without requiring additional active mechanisms.
3Reliability
If an airtight seal is maintained around the needle, then fluid leakage is prevented, but the adaptor structure becomes more complex
Solution Approach 1:
The elastomeric septum is a self-sealing component that automatically forms an airtight seal around the needle through its elastic deformation. As the needle penetrates the septum, the material naturally conforms to the needle's shape and size, creating a customized seal without requiring additional sealing mechanisms, adjustables, or complex structural elements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively inhibits leakage of fluid and maintains an airtight seal around the needle, ensuring safe and secure fluid transfer without exposing the needle end.
Implementation Method 1
a septum, mounted inside the septum housing. The septum housing is configured to slide proximally within the body lumen such that a distal end of the needle contained in the cavity passes through the distal face of the septum
Data Source
AI summary
A syringe adaptor includes a body, shaped to define a body lumen, a syringe fitting at a proximal end of the body, configured to connect to a distal end of a syringe, a needle extending distally from the syringe fitting into the body lumen, a septum housing, and an elastomeric septum mounted inside the septum housing. The septum includes a proximal face, shaped to define an aperture having an aperture diameter, and a distal face. The septum is shaped to define a cavity, joined to the aperture, having a cavity diameter that is larger than the aperture diameter. The septum housing is configured to slide proximally within the body lumen such that a distal end of the needle contained in the cavity passes through the distal face of the septum. Other embodiments are also described.