Irrigated Ablation System Temperature Control
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Solution Overview
Problem
During cardiac ablation procedures, there is a challenge in controlling the temperature of myocardial tissue to prevent overheating, which can lead to charring and tissue damage, as existing methods struggle to maintain a stable temperature within a safe range.
Innovation Solution
An irrigated ablation system with a medical probe equipped with a temperature sensor, an ablation electrode, and a pump that adjusts the irrigation fluid flow rate based on temperature feedback to maintain the myocardial tissue temperature within ±2.5°C of a specified target temperature up to 55°C, using ablation energy such as radio-frequency energy, while delivering a constant level of energy to the electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a temperature sensor and irrigation system are used to control tissue temperature, then the risk of overheating and charring is reduced, but the system complexity increases
Solution Approach 1:
The system employs a temperature sensor that continuously monitors myocardial tissue temperature and feeds this information back to a control system. The control system adjusts the irrigation fluid flow rate in real-time based on the temperature feedback, creating a closed-loop control mechanism that maintains temperature within the safe range of 42-55°C while preventing charring and overheating.
Solution Approach 2:
Irrigation fluid serves as an intermediary substance between the ablation electrode and the myocardial tissue. The fluid is delivered through a channel in the catheter and applied to the tissue surface to absorb excess heat generated during ablation, thereby cooling the tissue and preventing thermal damage while allowing controlled energy delivery.
2Reliability
If irrigation fluid flow rate is increased to prevent charring, then tissue temperature control improves, but energy loss increases
Solution Approach 1:
The irrigation fluid flow rate is made dynamic rather than static. The system continuously adjusts the flow rate based on real-time temperature measurements from the sensor. When tissue temperature approaches the upper limit of the target range, the flow rate increases to enhance cooling; when temperature is within the optimal range, the flow rate is reduced to minimize energy loss and fluid consumption.
Solution Approach 2:
The system changes the flow rate parameter of irrigation fluid dynamically during the ablation procedure. By modulating this parameter in response to temperature feedback, the system optimizes the balance between cooling effectiveness and energy efficiency, ensuring temperature stability while minimizing unnecessary fluid delivery and associated energy loss.
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 system effectively reduces the risk of heat-related complications by maintaining the myocardial tissue temperature within a narrow range, minimizing the risk of steam-pops and ensuring successful ablation while preventing tissue damage.
Implementation Method 1
an ablation electrode disposed at the distal end and configured to convey ablation energy to a region of myocardial tissue
Implementation Method 2
a temperature sensor disposed at the distal end and configured to output a temperature signal indicative of a temperature of the region of myocardial tissue
Implementation Method 3
the region being ablated may be irrigated with an irrigation fluid, typically saline, in order to prevent charring
Data Source
AI summary
A system including a medical probe having a tube with a distal end for insertion into a cardiac chamber, an electrode at the distal end that conveys energy to myocardial tissue, a temperature sensor at the distal end that outputs a signal indicating a temperature of the tissue, a channel contained within the tube that delivers fluid to the distal end, and a fluid port at the distal end and coupled to the channel. The system also includes a generator that applies a specified level of the energy to the electrode, a pump that forces the fluid into the channel at a controllable rate, and a processor that controls the rate responsively to the signal so that a difference between a specified temperature, which is no greater than 55° C., and the indicated temperature is no greater than ±2.5° C. while the generator applies a constant level of the energy.