Coupler Device for Medical Infusion Valve Assembly
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Solution Overview
Problem
Prior pressure-activated infusion devices face challenges with fluid reflux due to misalignment and shifting of flexible check valves, which complicates the coupling process and leads to improper operation.
Innovation Solution
A coupler device is designed to securely align and connect a flow-control valve to a pressure-activated infusion device, utilizing a luer lock fitting and a swage configuration for a permanent connection, preventing fluid reflux by regulating infusion and aspiration pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flexible check valve is used to prevent fluid reflux, then fluid reflux is reduced, but coupling alignment becomes difficult and the valve may shift or squirm within the housing
Solution Approach 1:
The patent introduces a coupler as an intermediary component between the infusion device and the flexible check valve. This coupler includes a valve housing with a valve seat that precisely positions the check valve, acting as a mediator that ensures accurate alignment while allowing the valve to perform its reflux-prevention function. The coupler's internal passage is precisely formed to align with the valve housing, eliminating the alignment difficulties associated with direct coupling.
Solution Approach 2:
The patent divides the coupling system into separate functional components: the infusion device, the coupler (which includes the valve housing), and the check valve. This segmentation allows each component to be optimized independently - the coupler provides precise alignment and positioning, while the check valve focuses on fluid control. The modular design enables the valve to be seated securely within the coupler's valve seat, preventing shifting or squirming during operation.
2Device complexity
If the check valve is directly coupled to the infusion device, then the device structure is simplified, but the valve misalignment and improper operation occur
Solution Approach 1:
The coupler serves as a necessary intermediary that ensures reliable valve operation. While it adds a component to the system, it provides the precise alignment and secure positioning that direct coupling cannot achieve. The coupler's valve seat receives and secures the check valve, preventing misalignment and improper operation that would otherwise occur with direct coupling to the infusion device.
3Strength
If the valve is seated in the housing, then the connection is secure, but the valve shifts or squirms causing misalignment
Solution Approach 1:
The coupler's valve seat is designed with specific local geometric features that match the check valve's shape. This localized precision fitting ensures that when the valve is seated, it is held securely in the correct alignment position. The valve seat's geometry is specifically tailored to prevent shifting or squirming, providing both secure connection and precise alignment simultaneously through its specialized local structure.
Data Source
AI summary
A coupler of a valve assembly for coupling a flow control valve to an infusion device. The coupler includes a proximal portion and a distal portion. The proximal portion comprises a plurality of recessed segments configured for receiving the infusion device. The distal portion comprises a valve flange that defines a central cavity for receiving the flow control valve. The valve flange comprises a swage extending radially inward to the central cavity for mechanically engaging a luer lock fitting of the valve assembly.