Cryoablation Balloon Temperature Control Under Safe Pressure Limits
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Solution Overview
Problem
Traditional cryoablation systems face challenges in maintaining a desired temperature for an extended period, leading to prolonged procedure times and increased surgical risks due to constant flow rate control, which results in unsatisfactory pulmonary vein isolation (PVI) effects and tissue damage.
Innovation Solution
A method and system for cryoablation temperature control that dynamically collaborates flow rate and temperature control using proportional-derivative (PD) or proportional-integral-derivative (PID) algorithms to maintain the balloon's interior temperature and pressure within safe thresholds, allowing seamless switching between control modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If constant flow rate control is used during settlement phase, then operation simplicity is maintained, but temperature stability deteriorates and procedure time increases
Solution Approach 1:
The system dynamically switches between constant flow rate control and temperature control modes based on the ablation phase. During the settlement phase, constant flow rate control is used for simplicity. During the maintenance phase, temperature control is activated to maintain stable low temperature, resolving the contradiction between operational simplicity and temperature stability.
Solution Approach 2:
The control system operates in periodic phases: first a settlement phase with constant flow rate control, then a maintenance phase with temperature control. This periodic switching allows the system to benefit from both control strategies at appropriate times, achieving both operational simplicity and temperature stability.
2Device complexity
If constant flow rate control is used, then device complexity is reduced, but procedure time is prolonged due to multiple temperature recovery cycles
Solution Approach 1:
The system implements periodic control phases where the maintenance phase with temperature control eliminates the need for multiple temperature recovery cycles. This reduces overall procedure time while keeping the control system relatively simple through phase-based switching.
Solution Approach 2:
The temperature control mode uses real-time temperature feedback to adjust the flow rate and maintain the desired low temperature. This feedback mechanism prevents temperature fluctuations that would otherwise require procedure interruptions and recovery cycles, thereby reducing total procedure time.
3Device complexity
If constant flow rate control is used, then control system simplicity is maintained, but pulmonary vein isolation effectiveness deteriorates
Solution Approach 1:
The system dynamically transitions from simple constant flow rate control to active temperature control during the maintenance phase. This ensures the balloon maintains stable low temperature for sufficient duration, improving PVI effectiveness while keeping the overall system relatively simple through phase-based operation.
Solution Approach 2:
Real-time temperature monitoring and feedback control during the maintenance phase ensure the balloon maintains the required low temperature for effective pulmonary vein isolation. This feedback mechanism guarantees PVI effectiveness without requiring complex continuous control throughout the entire procedure.
4Ease of operation
If constant flow rate control is used, then operational complexity is reduced, but tissue damage risk increases due to temperature fluctuations
Solution Approach 1:
The system dynamically switches to temperature control mode during the maintenance phase to prevent temperature fluctuations that could cause tissue damage. This maintains operational simplicity during the settlement phase while protecting tissue during the critical maintenance phase through active temperature regulation.
Solution Approach 2:
The system proactively switches to temperature control before temperature fluctuations can occur during the maintenance phase. This preventive approach ensures temperature stability and protects against tissue damage before harmful temperature variations can affect the tissue.
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 reduces operational complexity, procedure time, and surgical risk while ensuring stable balloon operation, improving PVI effects and reducing tissue damage.
Implementation Method 1
a temperature sensor for capturing a real-time temperature value of an interior of the balloon
Implementation Method 2
a first pressure sensor disposed in a gas outlet channel for the balloon and configured to capture a real-time gas pressure value on a gas outlet side of the balloon
Implementation Method 3
applying to the site a cryogenic liquid, which absorbs by evaporation and takes away heat from tissue at the site and thereby lowers its temperature
Data Source
Figure 1
Figure 2~4
Figure 5~8
AI summary
A cryoablation temperature control method, system and computer-readable storage medium. The method is used to control a temperature of the interior of a cryoablation balloon and includes: generating, based on an acquired real-time temperature value and a preset target temperature value of the interior of the balloon and/or a real-time gas flow rate value and a target gas flow rate value of a gas recovery passage in a gas outlet channel for the balloon, a first target liquid inlet pressure control signal for controlling a liquid supply flow rate of a high-pressure proportional valve in a liquid supply channel for the balloon; generating, based on an acquired real-time gas pressure value on, and a preset target gas pressure value for, a gas outlet side of the balloon, a first target gas outlet pressure control signal for controlling a gas outlet flow rate of a low-pressure proportional valve in the gas outlet channel for the balloon and for coordinating with the first target liquid inlet pressure control signal to perform control so that a pressure in the interior of the balloon is within a predefined safe pressure threshold value range and the temperature of the interior of the balloon is brought to and/or maintained at the target temperature value. This application allows accurate temperature control within a wide range and a short procedure time.