Helical Ablation Antenna Fluid Cooling to Prevent Overheating
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Solution Overview
Problem
Minimally invasive ablation systems face challenges in effectively delivering energy to target tissues while preventing excessive heating that can cause tissue damage, requiring innovative solutions for precise energy delivery and cooling mechanisms.
Innovation Solution
The energy delivery system comprises a flexible antenna with a helical dipole design, a coaxial transmission member, and a fluid cooling system, where a barrier layer and jacket form a fluid channel to cool the antenna, preventing fluid migration and maintaining mechanical rigidity, allowing for efficient microwave energy transmission and tissue ablation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a fluid cooling system is added to the antenna, then temperature control is improved, but device complexity increases
Solution Approach 1:
The fluid cooling system is nested within the antenna structure by forming a fluid channel between the barrier layer and the jacket, with the transmission member positioned centrally. This nested arrangement allows the cooling system to be integrated into the existing antenna geometry without requiring separate external cooling components, thereby improving temperature control while minimizing the increase in device complexity.
Solution Approach 2:
A fluid cooling system is implemented by introducing a fluid channel between the barrier layer and the jacket through which cooling fluid can circulate. This hydraulic approach directly addresses the temperature control challenge by using fluid flow to dissipate heat generated during microwave energy transmission, maintaining safe operating temperatures without requiring complex mechanical cooling mechanisms.
2Reliability
If a barrier layer and jacket are added to prevent fluid migration, then reliability is improved, but device complexity increases
Solution Approach 1:
The barrier layer is positioned between the transmission member and the fluid channel, while the jacket surrounds the barrier layer, creating a nested multi-layer structure. This nested arrangement ensures that each layer serves a specific function (transmission, containment, structural support) while maintaining a compact integrated design, thereby improving reliability through proper fluid containment without excessive structural complexity.
Solution Approach 2:
The barrier layer and jacket are implemented as flexible concentric layers that can be collapsed or expanded. This flexible shell approach provides effective fluid containment and migration prevention while allowing the structure to adapt to different operational conditions, maintaining reliability without requiring rigid complex structural supports.
3Strength
If the jacket is made rigid to maintain mechanical stability, then strength is improved, but flexibility decreases
Solution Approach 1:
The jacket is designed as a flexible shell that can be collapsed or expanded, providing mechanical stability when needed while allowing flexibility for navigation through body passages. This flexible shell structure maintains sufficient strength to prevent fluid leakage and support the antenna components, yet can be compressed to a small profile for delivery and expanded at the target site to provide structural support during operation.
Solution Approach 2:
The jacket transitions between different mechanical states - collapsed during delivery to maintain flexibility and navigate body passages, and expanded during operation to provide mechanical rigidity and structural stability. This dynamic state change allows the same structure to satisfy both flexibility requirements during insertion and strength requirements during energy delivery, resolving the contradiction between rigidity and adaptability.
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 enables precise and controlled tissue ablation with reduced risk of overheating, enhancing the effectiveness and safety of minimally invasive procedures by maintaining temperature control through fluid cooling, thus minimizing tissue damage.
Implementation Method 1
a fluid cooling system, where a barrier layer and jacket form a fluid channel to cool the antenna
Implementation Method 2
Ablation instruments transmit energy in the form of electromagnetic waves to a targeted area of tissue
Data Source
AI summary
An energy delivery system includes a transmission member, an antenna at a distal end of the transmission member, a jacket surrounding the transmission member and the antenna, a fluid channel between the transmission member and the jacket, and a plug disposed at the distal end of the transmission member and a proximal end of the antenna. The plug is configured to prevent migration of a cooling fluid from the fluid channel to a cavity between the antenna and the jacket.