Irrigated Ablation Catheter Valve Preventing Blood Backflow
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Solution Overview
Problem
Conventional ablation catheters face challenges with backflow of blood into the catheter during irrigation, leading to potential clotting and catheter malfunction, and require continuous low saline flow to prevent backflow, which can cause fluid overload and hemodilution in patients.
Innovation Solution
An irrigated ablation catheter equipped with a self-actuated valve element that prevents backflow by expanding to cover through holes when pressure exceeds a certain threshold, allowing saline flow during use and blocking it when pressure drops, thereby reducing saline delivery and preventing blood from entering the catheter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous low saline flow is used to prevent backflow, then backflow prevention is improved, but fluid overload and hemodilution occur
Solution Approach 1:
The valve element automatically responds to pressure changes within the catheter system. When irrigation flow stops or reverses, the pressure differential causes the valve element to shift position and block the through-holes, preventing backflow without requiring external control mechanisms or continuous saline flow
Solution Approach 2:
The patent replaces the mechanical system of continuous saline flow with a pressure-responsive valve mechanism. The valve element uses the inherent pressure differentials during irrigation to automatically open or close, eliminating the need for continuous fluid delivery to maintain backflow prevention
2Quantity of substance
If irrigation flow is stopped to reduce saline delivery, then fluid overload is reduced, but backflow of blood into the catheter occurs
Solution Approach 1:
The valve element automatically detects the cessation of irrigation flow through pressure changes and self-actuates to the closed position, blocking the through-holes and preventing backflow. This eliminates the need to maintain continuous saline flow to prevent backflow
Solution Approach 2:
The valve mechanism utilizes hydraulic pressure differentials created during irrigation to control valve element position. When irrigation pressure is present, the valve remains open; when pressure drops or reverses, the valve automatically closes to prevent backflow
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 valve mechanism effectively prevents backflow and reduces the need for continuous saline irrigation, minimizing fluid overload and blood clotting within the catheter, enhancing the efficiency and safety of ablation procedures.
Implementation Method 1
the valve element being movable between a closed position to block fluid flow through the one or more through holes and an open position to allow fluid flow through the one or more through holes
Data Source
AI summary
The invention relates to an ablation catheter which controls the temperature and reduces the coagulation of biological fluids on an electrode of a catheter, prevents the impedance rise of tissue in contact with the electrode, and maximizes the potential energy transfer to the tissue, thereby allowing an increase in the lesion size produced by the ablation. The electrode includes passages positioned to allow saline flow out of an inner cavity of the electrode. This fluid flow produces the desired cooling effect and is accomplished, for example, by saline irrigation flow with a valve element to block flow of blood into the inner cavity of the electrode.