Microwave Ablation Cannula Cooling to Prevent Skin Burns
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Solution Overview
Problem
Microwave ablation procedures face the risk of skin burns due to localized heating near the entry point of the ablation device, leading to patient discomfort and potential medical interventions.
Innovation Solution
A temperature control system with a secondary cooling mechanism, including a temperature regulator and flexible channel, is integrated into the energy delivery device to monitor and regulate skin temperature, using coolant fluid to prevent skin burns during microwave ablation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If microwave energy is delivered to tissue for ablation, then deeper penetration and larger thermal lesions are achieved, but skin burn risk increases at the entry point
Solution Approach 1:
A temperature regulator is introduced as an intermediary component between the microwave antenna and the skin surface. This regulator acts as a thermal mediator that absorbs excess heat through coolant circulation, preventing direct thermal damage to the skin while allowing the microwave energy to effectively heat the target tissue deeper in the body.
Solution Approach 2:
The cooling system applies localized thermal management specifically at the skin entry point rather than uniformly throughout the entire ablation zone. The temperature regulator is positioned only where skin contact occurs, providing targeted cooling to protect the skin while leaving the deeper tissue heating unaffected, thus maintaining ablation effectiveness.
2Reliability
If temperature monitoring and cooling systems are added to prevent skin burns, then patient safety is improved, but device complexity increases
Solution Approach 1:
The temperature regulator serves multiple functions simultaneously: it provides thermal protection to the skin, structurally supports the antenna positioning, and can be integrated with the existing microwave delivery system. This multi-functionality reduces the need for separate dedicated cooling components, thereby limiting the increase in overall device complexity.
Solution Approach 2:
The cooling system utilizes hydraulic principles by circulating coolant fluid through channels in the temperature regulator. This approach replaces more complex mechanical cooling mechanisms (such as moving parts or phase-change systems) with a simple fluid circulation system, maintaining reliability while minimizing structural complexity.
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 prevents or reduces skin burns by providing real-time temperature monitoring and adjustable cooling, ensuring safe and controlled ablation procedures.
Implementation Method 1
The temperature regulator is to receive coolant fluid from a coolant supply to control a temperature of the skin
Implementation Method 2
an antenna extending from the cannula and operable to deliver energy to tissue of the patient
Implementation Method 3
Microwave energy is an effective energy source for heating biological tissues
Data Source
AI summary
An energy delivery device is disclosed including a cannula extendable through skin of a patient, an antenna extending from the cannula and operable to deliver energy to tissue of the patient, and a temperature regulator movable along a length of the cannula and operable to control a temperature of the skin as the antenna provides energy to the tissue.