Disposable Contrast Fluid Set with One-Way Valve and Releasable Connection
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Solution Overview
Problem
Existing contrast medium dispensing systems do not allow verification of correct insertion of the dosing device into a patient's vein, leading to potential contamination risks due to backflow of blood from the vein into the reservoir and bulk source.
Innovation Solution
A disposable set with a dual-tubing system featuring a one-way valve that permits fluid flow from the dispensing unit to the dosing device while preventing backflow, and a releasable connection for blood reflux control, allowing verification of correct insertion by aspirating blood backflow before re-establishing connection to prevent contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a disposable set with a tube connecting the dispensing unit to the dosing device is used, then the system can be simplified and made disposable, but the ability to verify correct insertion of the dosing device into the vein is lost
Solution Approach 1:
The tube is divided into a first tube part and a second tube part that can be disconnected from each other. The first tube part connects to the dispensing unit and contains a one-way valve, while the second tube part connects to the dosing device. This segmentation allows the system to maintain simplicity as a disposable set while enabling verification of correct insertion by allowing disconnection to aspirate blood backflow from the vein.
2Device complexity
If the tube is made as a single continuous piece, then the structure is simpler, but backflow of blood from the vein into the reservoir and bulk source cannot be prevented
Solution Approach 1:
A one-way valve is introduced as an intermediary component in the first tube part, between the dispensing unit and the releasable connection. This one-way valve acts as a mediator that permits fluid flow from the dispensing unit to the dosing device while preventing backflow of blood from the vein into the reservoir and bulk source, thus preventing contamination without requiring a complex multi-piece tube structure.
3Stability of the object's composition
If the tube remains connected during blood backflow verification, then the system maintains continuity, but the ability to aspirate blood for verification is prevented
Solution Approach 1:
The releasable connection between the first and second tube parts transforms the static continuous tube into a dynamic system that can be connected or disconnected. During normal operation, the connection is made to maintain system continuity. During verification, the connection is released to allow blood backflow aspiration, and then reconnected to restore continuity. This dynamic capability enables both verification and continuity without compromise.
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
Ensures correct insertion of the dosing device into the vein, minimizing the risk of fluid flow into surrounding tissue and contamination of the manifold or reservoir, thereby reducing the risk of necrosis and maintaining system sterility.
Implementation Method 1
the first tubing part (1) comprises a one-way valve (3) which is provided to permit a fluid flow from the dispensing unit (17, 18) towards the dosing device (8) and to prevent a backward fluid flow from the dosing device (8) towards the reservoir (17, 18)
Implementation Method 2
the first end part (4) of the first tubing part (1) and the second end part (9) of the second tubing part (10) are in fluid connection with each other in a liquid tight manner by means of a releasable connection device (11, 12)
Data Source
Figure 1~2
Figure 3
AI summary
The present invention relates to a disposable set (5) for establishing a fluid connection between a fluid dispensing unit (17) and a dosing device adapted to dispense the fluid into a patients' vein. The disposable set comprises a length of a tubing (15) for establishing a fluid connection from the dispensing unit towards and into the dosing device, wherein the tubing (15) comprises a first (1) and a second (10) tubing part. The first tubing part (1) is provided to establish a connection to the second tubing part (10) and to the fluid dispensing unit. The second tubing part (10) is provided to establish a connection towards the dosing device and the patient and to the first tubing part (1). The first tubing part (1) comprises a one-way valve (3) which permits a fluid flow from the dispensing unit (17, 18) towards the dosing device and the patient and to prevent a backward fluid flow from the dosing device towards the dispensing unit. The first and second tubing part are in fluid connection with each other in a liquid tight manner by means of a releasable connection device (11, 12), which is adapted to permit a back flow from the patient in the direction of the releasable connection device in the released position of the releasable connection and to prevent a back flow from the patient in the direction of the releasable connection device (11, 12) in the closed position of the releasable connection.