Split Septum Assembly for Intravenous Injection Sites
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Solution Overview
Problem
Intravenous injection sites face challenges with fluid passageway design, leading to difficulties in inserting cannulas or needles without impinging on the walls, and have a large form factor that is not suitable for neonates or small animals, making it hard to achieve a seal against fluid leakage.
Innovation Solution
A miniaturized intravenous injection site with a split septum assembly that includes a resilient and compressible split septum, a septum holder, and a septum housing, featuring a conically-shaped fluid passageway to allow angled insertion and a compact design suitable for smaller patients, providing a double hermetic seal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the fluid passageway is designed as a generally axially straight configuration, then the structure is simple and easy to manufacture, but the clinician must insert the cannula or needle at a precise center point, and off-axis insertion causes impingement on the fluid passageway walls requiring retraction and reinsertion
Solution Approach 1:
The fluid passageway is configured with a conical shape that angles downward from the septum toward the distal end. This curvature allows the cannula or needle to be inserted at various angles without impinging on the passageway walls, eliminating the need for precise centering and avoiding the need for retraction and reinsertion.
2Volume of moving object
If the form factor of the intravenous device is reduced to suit neonates or small animals, then the device becomes suitable for smaller patients, but it becomes more difficult for the septum to seal against undesired fluid flow and the priming volume is reduced
Solution Approach 1:
The sealing system is segmented into multiple components: an internal seal formed by the conical fluid passageway walls and an external seal formed by a flange with sealing projections. This segmentation allows each seal to work independently, maintaining reliable sealing even in the miniaturized device configuration.
Solution Approach 2:
The conical shape of the fluid passageway creates an internal seal through its angled walls, which prevent fluid leakage without requiring additional sealing components that would increase device size. This geometric sealing solution is particularly effective in miniaturized devices.
3Volume of moving object
If the form factor is reduced, then the device is suitable for neonates and small animals, but the priming volume is reduced
Solution Approach 1:
The conical configuration of the fluid passageway optimizes the volume distribution, allowing the device to maintain adequate priming volume while minimizing overall device dimensions. The tapered shape efficiently utilizes the available space for fluid capacity.
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 allows for easy and secure insertion of cannulas or needles, reduces the risk of introducing bacteria, and provides a compact, effective seal against fluid leakage, making it suitable for use in neonates and small animals.
Implementation Method 1
a resilient and compressible split septum for receiving a blunt cannula or needle through a slit formed in the septum
Implementation Method 2
a conically-shaped fluid passageway that angles downward from the septum toward the distal end
Implementation Method 3
providing a double hermetic seal
Data Source
AI summary
An intravenous injection site having a split septum assembly interfit with the site for the intravenous administration of fluids to a patient. The split septum assembly has a resilient and compressible split septum having an axially-formed slit for receipt of a blunt cannula, needle, or other medical device through said slit, a septum holder for receipt of the split septum, and a septum housing for receipt of the combined septum holder and split septum. The septum includes a body and a flange extending radially from the body. A projection extends from the flange. The septum is mounted within the septum holder, and the septum holder is mounted within the septum housing to provide axial compression of the flange. This axial compression presents a double hermetic seal that significantly minimizes or prevents proximal leakage of fluid through the slit or around the septum holder when the cannula is removed.