Catheter Injection Port Backflow Control Device
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Solution Overview
Problem
Current catheter systems face challenges in preventing backflow of fluids through the injection port, which can lead to malfunction and improper fluid administration in vascular access devices.
Innovation Solution
The catheter assembly incorporates an injection port backflow control device featuring a concentric port, bellow, and duckbill valve configuration that allows fluid entry while preventing backflow, utilizing a compressible bellow and deformable duckbill valve to manage fluid flow effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an injection port is provided on the catheter hub for fluid administration, then ease of operation is improved, but backflow of fluids may occur causing malfunction
Solution Approach 1:
A backflow control device is introduced as an intermediary component within the injection port. This device includes a duckbill valve that acts as a mediator between the injection port and the catheter hub, allowing intentional fluid injection while preventing unintended backflow. The duckbill valve opens to permit fluid entry during injection and closes to prevent backflow, thus resolving the contradiction between ease of operation and reliability.
Solution Approach 2:
The backflow control device employs dynamic elements including a compressible bellow and a deformable duckbill valve. The bellow can be compressed to allow fluid entry and returns to its original shape to block the port. The duckbill valve dynamically opens and closes based on fluid pressure direction, enabling the system to adapt its state (open for injection, closed for backflow prevention) according to operational needs, thus maintaining both ease of operation and reliability.
2Reliability
If a backflow control device is added to prevent fluid backflow, then reliability is improved, but device complexity increases
Solution Approach 1:
The backflow control device merges multiple functions into a single integrated assembly. The duckbill valve, bellow, and spring are combined into one compact unit that fits within the injection port. This merging approach allows the device to provide backflow prevention, fluid injection capability, and sealing functions through a single component assembly, thereby improving reliability while minimizing the increase in device complexity.
Solution Approach 2:
The backflow control device utilizes flexible components including a deformable duckbill valve made from flexible material and a compressible bellow. These flexible elements can deform to allow fluid passage and return to their original shape to create sealing barriers. The use of flexible shells and films enables effective backflow prevention through simple geometric deformation rather than complex mechanical mechanisms, thus improving reliability with minimal added complexity.
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
This configuration ensures reliable fluid administration by allowing fluids to flow into the catheter hub while preventing backflow, enhancing the stability and functionality of vascular access devices.
Implementation Method 1
the bellow may be vertically compressible from the expanded state to a compressed state
Implementation Method 2
the bellow, in the compressed state, may permit fluids to flow into the sidewall opening of the concentric port
Implementation Method 3
the duckbill valve may be configured to expand to permit passage of a fluid into the catheter hub
Data Source
AI summary
A catheter assembly may include a catheter, a catheter hub coupled to the catheter, an injection port on the catheter hub, and an injection port backflow control device. The backflow control device may include a concentric port, a bellow, and a duckbill valve. The injection port backflow control device may include a split septum and a duckbill valve. The injection port backflow control device may include a deformable annular valve disposed around an inner surface of the catheter hub and may block an opening in the catheter hub connected to the injection port. The injection port may receive a needleless syringe for administration of medicine or other fluids. The injection port backflow control device may permit fluids to flow into the catheter hub and may prevent fluids from flowing out of the catheter hub through the injection port.