Fluid-Cooled Antenna Assembly Thermal Feedback Control
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Solution Overview
Problem
Existing electrosurgical devices face challenges in maintaining precise temperature control during tissue ablation, as the small temperature difference between malignant and healthy cells requires careful heating patterns to avoid damaging surrounding tissue, and inadequate cooling can lead to device failure and adverse tissue effects.
Innovation Solution
An electrosurgical system with a fluid-cooled antenna assembly and a feedback control system that uses temperature sensors to regulate the flow of coolant fluid, ensuring a thermal-feedback-controlled rate of fluid flow to maintain optimal cooling and prevent tissue damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electromagnetic energy is applied to heat tissue for ablation, then malignant cells are destroyed, but healthy cells may be damaged due to temperature control difficulties
Solution Approach 1:
The patent implements a feedback control system that continuously monitors temperature at the antenna assembly and adjusts coolant flow rate accordingly. Temperature sensors provide real-time data to a controller that modulates the coolant flow to maintain the antenna temperature within a safe operating range, preventing both overheating of tissue and damage to healthy cells while ensuring effective tumor cell destruction
Solution Approach 2:
The system dynamically changes the coolant flow rate parameter based on measured temperature conditions. By adjusting this parameter in real-time, the system optimizes the balance between delivering sufficient energy to destroy malignant cells and preventing excessive heating that would damage healthy surrounding tissue
2Reliability
If coolant flow rate is increased to prevent device overheating, then device reliability improves, but energy delivery to tissue may be compromised
Solution Approach 1:
The patent employs dynamic control of coolant flow rate rather than a fixed flow rate. The system continuously adapts the coolant flow to match the actual thermal conditions and energy delivery requirements. This dynamic adjustment ensures the antenna assembly remains within safe operating temperatures while maintaining optimal energy delivery to tissue for effective ablation
3Object-affected harmful factors
If temperature control is made more precise to protect healthy tissue, then safety improves, but system complexity increases
Solution Approach 1:
The patent utilizes a feedback control architecture where temperature sensors continuously monitor the antenna assembly temperature and provide signals to a controller. The controller processes this feedback and automatically adjusts the coolant flow rate to maintain precise temperature control. This feedback mechanism achieves accurate temperature management while keeping the control logic relatively simple and automated
Solution Approach 2:
The system incorporates self-regulating thermal management where the feedback control automatically adjusts coolant flow based on measured temperature conditions without requiring manual intervention. This self-service capability maintains precise temperature control for protecting healthy tissue while minimizing the operational complexity for the user
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 effectively maintains precise temperature control, reducing tissue damage and preventing device failure by dynamically adjusting coolant flow based on real-time temperature data, thereby enhancing the predictability of ablation procedures and ensuring safer treatment outcomes.
Implementation Method 1
fluid-cooled antenna assembly
Implementation Method 2
temperature sensors to regulate the flow of coolant fluid
Implementation Method 3
electromagnetic energy is passed through the probes into surrounding tissue
Data Source
AI summary
A method of directing energy to tissue using a fluid-cooled antenna assembly includes the initial step of providing an energy applicator. The energy applicator includes an antenna assembly and a hub providing at least one coolant connection to the energy applicator. The method also includes the steps of providing a coolant supply system including a fluid-flow path fluidly-coupled to the hub for providing fluid flow to the energy applicator, positioning the energy applicator in tissue for the delivery of energy to tissue when the antenna assembly is energized, and providing a thermal-feedback-controlled rate of fluid flow to the antenna assembly when energized using a feedback control system operably-coupled to a flow-control device disposed in fluid communication with the fluid-flow path.