Valved Catheter with Integral Compression Sleeve
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Solution Overview
Problem
Current catheters lack effective valves that prevent air embolism and blood loss, especially during procedures like reverse tunneling and guidewire placement, due to restricted flow paths, dead space issues, and inability to be reused multiple times.
Innovation Solution
A valved catheter design with an integral compression sleeve and bifurcating extension that automatically seals the proximal end when disconnected, allowing unobstructed flow and supporting 'over the guidewire' placement, while minimizing dead space and enabling repeated use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a typical catheter tube is used without a valve, then the catheter can be easily inserted and accessed, but air embolism and blood loss occur when the proximal end is open during disconnection
Solution Approach 1:
The catheter incorporates a self-actuating valve mechanism that automatically closes when the proximal end is disconnected from an attachable unit, eliminating the need for external clamps or additional sealing devices. The valve responds autonomously to pressure changes and disconnection events, providing reliable protection against air embolism and blood loss without requiring complex external control systems.
Solution Approach 2:
The catheter is divided into functional segments: a proximal end with an integrated valve mechanism, a distal end for vascular insertion, and an attachable unit interface. This segmentation allows the valve to be positioned specifically at the proximal end where it can effectively seal off the catheter when disconnected, while maintaining easy access and insertion capabilities at other locations.
2Reliability
If a valve is added to the catheter to prevent air embolism, then safety is improved, but dead space accumulates in the valve area
Solution Approach 1:
The valve mechanism is extracted from the main catheter lumen and positioned at the proximal end interface. This allows the valve to seal off the proximal end independently without significantly interfering with the distal lumen flow path. The valve is designed to minimize dead space by creating a tight seal at the interface where the attachable unit connects, rather than blocking the entire catheter lumen.
3Reliability
If the proximal end of the catheter is clamped during reverse tunneling, then air embolism is prevented, but the catheter cannot be reverse tunneled as described
Solution Approach 1:
The self-actuating valve automatically opens during reverse tunneling when the catheter is being pulled through the subcutaneous channel, allowing fluid flow and guidewire passage without requiring manual clamping. The valve responds to pressure changes and mechanical stress during the tunneling process, providing protection against air embolism while maintaining ease of operation.
Solution Approach 2:
The valve transitions from a static closed position during normal catheter use to a dynamic open position during reverse tunneling. The valve mechanism is designed to respond to mechanical stress and pressure changes, automatically opening to allow guidewire and fluid passage during the tunneling process, then closing automatically when the catheter is in place and disconnected from the attachable unit.
4Reliability
If a valved cap is used to prevent fluid loss and air entry, then safety is improved, but the cap cannot be reused multiple times
Solution Approach 1:
The valve is merged with the catheter structure itself rather than being a separate replaceable cap. The valve is integrated into the proximal end of the catheter tube, allowing it to remain in place for the life of the catheter. This integration enables multiple uses and repeated access without requiring removal or replacement of the valve component.
Solution Approach 2:
The integrated valve serves multiple functions: it prevents air embolism and blood loss when disconnected, allows guidewire passage during placement, enables fluid infusion and aspiration, and facilitates reverse tunneling. The valve is designed to withstand repeated use and multiple access events throughout the catheter's service life, providing universal protection and functionality.
Data Source
AI summary
A valved catheter that allows placement and withdrawal of an accessing device or attachable unit without the risk of air embolism or blood loss. In one variation, the valved catheter includes a catheter tube having a necked portion in its proximal end that forms an integral valve, the necked portion being surrounded by a compression sleeve that biases the valve in a closed position. In another variation, the valved catheter is a dual lumen catheter with a corresponding bifurcating extension for engaging the valves in the catheter in order to establish fluid communication through the catheter.