Microwave Antenna Array for Ablation Needle Guidance
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Solution Overview
Problem
Current medical imaging and ablation techniques face challenges in precisely guiding ablation probes to targets within the body, particularly in achieving localized heating with minimal destruction of surrounding healthy tissue, as they rely on imperfect electrical and dielectric conductivity, leading to inefficiencies in tumor treatment.
Innovation Solution
A medical imaging system comprising a microwave antenna array and an ablation probe, where the antenna array processes scattered microwave signals to identify and guide the ablation needle to the target, allowing for precise positioning and monitoring of the ablation procedure, including temperature control through permittivity and conductivity measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If needle ablation techniques (RFA/MWA) are used to treat tumors, then minimally invasive treatment is achieved, but precise localization and guidance of the ablation needle to the target is difficult
Solution Approach 1:
The system continuously monitors the position of the ablation needle using microwave imaging and provides real-time feedback to guide the needle to the target. The processor generates images showing the needle location relative to the tumor, allowing operators to adjust positioning dynamically during the procedure.
Solution Approach 2:
Microwave imaging acts as an intermediary between the ablation needle and the target tissue. The imaging system provides indirect visualization of the needle position and tumor location, enabling precise guidance without direct visual contact with the deep tissue structures.
2Temperature
If RF current is delivered through tissue to achieve ablation, then localized heating occurs near the electrode, but a large portion of the ablation zone is created by thermal conduction which may damage surrounding healthy tissue
Solution Approach 1:
The system monitors temperature distribution in real-time during ablation using microwave imaging and permittivity measurements. This feedback allows operators to adjust ablation parameters to maintain the ablation zone boundaries and protect surrounding healthy tissue from excessive thermal damage.
Solution Approach 2:
The system uses permittivity and conductivity measurements to characterize tissue properties and adjust ablation parameters accordingly. By changing operational parameters based on real-time tissue characterization, the system optimizes heating distribution to maximize tumor destruction while minimizing damage to adjacent healthy structures.
3Temperature
If microwave energy is delivered to achieve ablation, then dielectric heating of tissue occurs, but heating efficiency varies significantly based on water content in different tissue types
Solution Approach 1:
The system measures permittivity and conductivity of different tissue types using microwave imaging and adjusts ablation parameters accordingly. By adapting power levels, frequency, and exposure time based on real-time tissue characterization, the system compensates for variations in water content and achieves consistent heating efficiency across different tissue types.
Solution Approach 2:
The system applies different ablation parameters to different tissue regions based on their specific dielectric properties. By characterizing each tissue type locally through permittivity measurements and tailoring the heating parameters to match local tissue properties, the system achieves uniform heating efficiency across heterogeneous tissue environments.
4Measurement precision
If traditional imaging methods are used to identify targets, then tumor localization is achieved, but guidance of the ablation needle to the target during the procedure is insufficient
Solution Approach 1:
The microwave imaging system serves multiple functions: it identifies the target tumor, tracks the ablation needle position, monitors temperature distribution, and guides the procedure in real-time. This multi-functional capability eliminates the need for separate imaging and guidance systems, providing comprehensive support throughout the entire ablation process.
Solution Approach 2:
The system provides continuous real-time feedback during needle insertion and positioning by generating updated images showing needle location relative to the target. This feedback loop enables operators to make immediate adjustments to achieve precise needle placement and maintain accurate positioning throughout the ablation procedure.
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 minimally invasive ablation procedures by accurately guiding the ablation needle to the target, ensuring localized heating and reducing damage to surrounding tissue, thus improving treatment efficacy and reducing the risk of seeding malignant cells.
Implementation Method 1
a microwave antenna array comprising a transmitting antenna and a plurality of receiving antennae, wherein the transmitting antenna is configured to transmit microwave signals so as to illuminate a body part of a patient
Implementation Method 2
the receiving antennae are further configured to receive microwave signals scattered or emitted by the ablation needle and the processor is further configured to monitor a position of the ablation needle as it is guided to the target within the body part
Implementation Method 3
The ablation needle may be configured to emit microwave signals which are received by the receiving antennae
Implementation Method 4
MWA occurs as a result of dielectric heating of tissue. Dielectric heating occurs when an alternating EM field is applied to an imperfect dielectric material. In tissue, heating occurs because the EM field forces water molecules in the tissue to oscillate. The bound water molecules tend to oscillate out of phase with the applied fields, so some of the EM energy is absorbed and converted to heat.
Implementation Method 5
a processor configured to process the scattered microwave signals and generate an output indicative of the internal structure of the body part to identify a target within the body part
Data Source
AI summary
A medical imaging system comprising: a microwave antenna array comprising a transmitting antenna and a plurality of receiving antennae, wherein the transmitting antenna is configured to transmit microwave signals so as to illuminate a body part of a patient and the receiving antennae are configured to receive the microwave signals following scattering within the body part; a processor configured to process the scattered microwave signals and generate an output indicative of the internal structure of the body part to identify a target within the body part; and an ablation probe comprising an ablation needle movable relative to the microwave antenna array; wherein the receiving antennae are further configured to receive microwave signals scattered or emitted by the ablation needle and the processor is further configured to monitor a position of the ablation needle and to guide the ablation needle to the identified target within the body part which it can be used to perform an ablation procedure.