Intravenous Catheter Needle Guard and Pressure Valve
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Solution Overview
Problem
Existing intravenous catheter apparatuses are complex to manufacture and lack effective safety features, such as reliable needle guards and pressure-activated valves, which can lead to accidental needle pricking and intraluminal thrombosis, requiring frequent catheter replacements and posing risks of infection.
Innovation Solution
An intravenous catheter apparatus with a needle guard that automatically covers the needle tip and a pressure-activated valve that controls fluid flow based on pressure differentials, featuring a needle guard with a disc-like retaining protrusion and a valve with an elastomeric member that deflects to allow fluid flow, reducing the risk of accidental needle exposure and thrombosis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flow valve is added to prevent blood reflux and intraluminal thrombosis, then patient safety and reliability are improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The valve element is designed to automatically respond to pressure differentials between proximal and distal spaces, opening or closing based on physiological conditions without requiring external control mechanisms. The elastic element self-regulates fluid flow based on pressure changes, eliminating the need for complex mechanical actuation systems.
Solution Approach 2:
The patent replaces complex mechanically activated valve components with a simpler elastic element that responds directly to pressure differentials. This substitution of mechanical actuation with elastic deformation simplifies the overall valve structure while maintaining reliable function in preventing blood reflux.
2Reliability
If a needle guard with retaining mechanism is added to prevent accidental needle pricking, then safety is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The needle guard automatically engages with the catheter hub through a simple retaining protrusion-depression mechanism that activates based on the natural insertion and removal movements of the needle. No additional actuators or complex locking mechanisms are required - the system self-regulates needle guard positioning based on operational state.
Solution Approach 2:
The needle guard is designed as a separate, modular component that can be independently manufactured and assembled. The retaining protrusion and depression features are segmented into discrete elements that simplify manufacturing while ensuring reliable engagement with the catheter hub.
3Ease of operation
If existing flow valves are implemented to control fluid flow, then fluid management capability is improved, but manufacturing cost and assembly difficulty increase
Solution Approach 1:
The valve element, elastic element, and housing features are designed to be integrated into a single compact assembly that can be manufactured as one piece or pre-assembled unit. The retaining protrusions and depressions are incorporated directly into the housing structure, eliminating separate retaining components and simplifying assembly.
Solution Approach 2:
The valve assembly is designed with simple, inexpensive materials and structures that can be manufactured cost-effectively for single-use applications. The elastic element and valve housing are configured to provide reliable function without requiring expensive materials or complex manufacturing processes.
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 provides enhanced safety by preventing accidental needle pricking and reducing the risk of intraluminal thrombosis, while being cost-effective and easy to manufacture, ensuring reliable fluid control and reduced risk of infection.
Implementation Method 1
the first arm is deflected radially outwards by the needle against a restoring force
Implementation Method 2
the valve opens based on a pressure differential between the pressure prevailing in the distal space and the pressure prevailing in the proximal space
Data Source
AI summary
The invention relates to an intravenous catheter apparatus comprising: a catheter hub arranged at a proximal end of a catheter tube, the catheter hub having an inner surface defining a chamber; a needle defining an axial direction and having a needle tip, the needle extending through the chamber and the catheter tube when in a ready position; a needle guard slidably arranged on the needle and at least partially received in the chamber when the needle is in the ready position, the needle guard including a base portion and first and second arms extending from the base portion, wherein the first arm is deflected radially outwards by the needle against a restoring force when the needle is in the ready position whereby the needle guard is brought into retaining contact with the catheter hub; and wherein the catheter apparatus includes a valve which separates a distal space arranged in distal direction from the valve from a proximal space arranged on proximal direction from the valve. The invention further provides that the valve opens based on a pressure differential between the pressure prevailing in the distal space and the pressure prevailing in the proximal space.