Cryoablation Pressure Feedback Control for Stable Temperature and Flow
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Solution Overview
Problem
Existing cryoablation and cryo-mapping systems face challenges in maintaining precise control over fluid flow rate and temperature fluctuations, which can affect the accuracy and consistency of tissue treatment during cardiac procedures.
Innovation Solution
A feedback control system utilizing proportional integral derivative (PID) controllers with parallel branches to regulate injection pressure and valve control, ensuring accurate maintenance of set temperatures and flow rates through a closed-loop system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional cryoablation systems are used without feedback control, then the device complexity is reduced, but the temperature and flow rate control precision deteriorates
Solution Approach 1:
The patent implements a feedback control system where temperature sensors continuously monitor the cryocatheter temperature and flow rate sensors monitor the fluid flow rate. These measurements are fed back to PID controllers that automatically adjust the fluid injection pressure and valve control to maintain the desired temperature and flow rate setpoints, thereby achieving precise temperature and flow rate control through closed-loop feedback
Solution Approach 2:
The patent introduces PID controllers as intermediary components between the desired setpoints and the actual fluid delivery system. The PID controllers process the error signals (difference between setpoint and measured value) and generate appropriate control outputs to adjust the injection pressure and valve position, serving as mediators that translate control objectives into actionable commands for the fluid delivery system
2Stability of the object's composition
If conventional cryoablation systems are used without feedback control, then the device complexity is reduced, but the stability of temperature and flow rate deteriorates
Solution Approach 1:
The feedback control system continuously monitors temperature and flow rate and automatically adjusts the fluid injection pressure through PID controllers to maintain stable operating conditions. The closed-loop feedback mechanism detects deviations from the desired setpoints and implements corrective actions in real-time, ensuring stable temperature and flow rate during the ablation procedure
Solution Approach 2:
The control system operates autonomously by continuously measuring the actual temperature and flow rate, comparing them to the desired setpoints, and automatically adjusting the fluid delivery parameters without requiring manual intervention. The PID controllers self-regulate the injection pressure and valve control based on the measured deviations, enabling the system to maintain stable operation independently
3Manufacturing precision
If manual control of fluid injection pressure is used, then the device complexity is reduced, but the manufacturing precision of temperature and flow rate control deteriorates
Solution Approach 1:
The patent employs flow rate sensors to continuously measure the actual fluid flow rate and feeds this information back to the PID controllers. The controllers automatically adjust the injection pressure and valve control to maintain the desired flow rate setpoint, achieving precise flow rate control through closed-loop feedback without requiring manual adjustment
Solution Approach 2:
The patent replaces manual mechanical control of fluid injection pressure with an automated electronic control system. The PID controllers use electronic signals to regulate the injection pressure and valve position based on real-time feedback from flow rate sensors, substituting manual mechanical adjustment with automated electronic control to achieve higher precision
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 system enhances the precision and stability of cryoablation and cryo-mapping procedures by consistently maintaining desired temperature and flow rates, improving the effectiveness and reliability of tissue treatment.
Implementation Method 1
A feedback control system utilizing proportional integral derivative (PID) controllers with parallel branches to regulate injection pressure and valve control
Implementation Method 2
An ablation procedure may involve creating one or more lesions to electrically isolate tissue believed to be the source of an arrhythmia. One type of ablation is cryoablation, which entails creating cold temperatures at specific regions of the body or contacting tissue with cold treatment devices to transfer heat from the targeted tissue to the cryogenic element, thus cooling and/or ablating the tissue.
Data Source
AI summary
A method and system for feedback control for cryo-mapping and cryoablation are disclosed. According to one aspect, a cryo-mapping and cryoablation control system includes a first control device configured to receive a target parameter value and a measured output parameter and to output an injection pressure target signal based on a first difference between the target parameter value and the measured output parameter. The system also includes a second control device configured to receive the injection pressure target signal and to output a valve control signal, the valve control signal being used to set a position of an injection pressure valve. The first control device is configured to determine a value of the injection pressure target signal to drive the first difference toward zero.