EP Catheter Grounding Path for Triboelectric Noise Reduction
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Solution Overview
Problem
Medical catheterization systems face challenges with ECG noise interference due to triboelectric charges generated by peristaltic pumps, which complicate accurate electrocardiographic monitoring during procedures.
Innovation Solution
The system reroutes triboelectric charges to an existing isolated ground before they reach the catheter electrode, eliminating noise by providing an electrical connection between the isolated ground and the conductive fluid upstream of the catheter, thus avoiding disruption to intracardiac signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a peristaltic pump is used to deliver electrically conductive fluid through the catheter, then the ablation site can be cooled effectively, but triboelectric noise is generated that interferes with ECG monitoring
Solution Approach 1:
The patent extracts the harmful triboelectric charge from the conductive fluid by providing a separate electrical connection path from the fluid to ground, allowing the charge to be removed independently from the fluid delivery function. This separates the cooling function from the noise generation problem.
Solution Approach 2:
The patent introduces an intermediary electrical connection (grounding path) between the conductive fluid and ground that acts as a mediator to discharge triboelectric charges. This intermediary path allows charges to be neutralized without affecting the primary function of fluid delivery for cooling.
2Productivity
If the pump is operated at higher speeds to improve fluid delivery rate, then cooling efficiency increases, but triboelectric noise generation increases
Solution Approach 1:
The patent converts the harmful triboelectric effect into a beneficial discharge mechanism by providing a controlled electrical path to ground. The same mechanical action that generates noise (pump compression of tubing) is used to generate charges that are then safely discharged through the grounding connection, turning a harmful byproduct into a controlled electrical phenomenon.
3Object-generated harmful factors
If additional electrical connections are added to remove triboelectric charges, then noise reduction is achieved, but device complexity increases
Solution Approach 1:
The patent merges the electrical grounding function with the existing fluid delivery system by integrating the electrical connection into the catheter structure itself. The grounding path is combined with the fluid lumen infrastructure, eliminating the need for separate external grounding equipment and reducing overall system complexity.
Solution Approach 2:
The catheter system is designed with multi-functionality, where the same catheter structure serves both fluid delivery and electrical grounding functions. The catheter components perform multiple roles: delivering conductive fluid for cooling while simultaneously providing a pathway for triboelectric charge discharge, reducing the need for additional specialized components.
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 approach significantly reduces or eliminates ECG noise spikes, improving the clarity of intracardiac recordings without adding lengthy cables or compromising patient safety.
Implementation Method 1
the pump may be another source of electrical noise, created by a triboelectric effect, whereby an induced charge is created on the surface of flexible tubing used in the pump and on the surface of the rotor surfaces used to compress the tubing
Implementation Method 2
providing an electrical connection between the isolated ground and the conductive fluid upstream of the catheter, thus avoiding disruption to intracardiac signals
Data Source
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AI summary
A catheterization system that includes an electrophysiologic (EP) catheter which has a lumen receiving an electrically conductive fluid delivered by a hydraulic line that is acted upon by a peristaltic pump advantageously avoids noise in intracardiac ECG signal recordings by using an electrical connection to short triboelectrical charge carried by the conductive fluid in the hydraulic line to an existing analog ground in the system. In one embodiment, the electrical connection includes an electrically conductive wire housed in the control handle and configured to provide electrical connection between the fluid and a pin on a printed circuit board housed in the control handle that is electrically connected to the analog ground. In another embodiment, the electrical connection shorts the electrically conductive fluid proximal of the control handle of the catheter.