RF Hyperthermia Feedback Modulation for Selective Tissue Heating
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current hyperthermia devices face challenges in achieving selective tissue heating, often damaging healthy tissues due to non-specific absorption of electromagnetic waves, and require high temperatures to induce necrosis, which can lead to unwanted side effects.
Innovation Solution
A radiofrequency hyperthermia device using capacitive coupling with conductive electrodes and a modulation feedback circuit that selectively heats target tissues by exploiting conductivity differences between healthy and diseased tissues, inducing apoptosis at lower temperatures through amplitude modulation and pink noise modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional hyperthermia devices are used to heat target tissue, then temperature increase is achieved, but healthy tissue is damaged due to lack of selectivity
Solution Approach 1:
The patent implements a feedback mechanism where a sensor detects the electrical properties of the target tissue and feeds this information back to the modulation signal generator. This closed-loop system allows real-time adjustment of the RF signal parameters based on actual tissue conditions, enabling selective heating of target tissue while monitoring and protecting surrounding healthy tissue from excessive temperature increase.
Solution Approach 2:
The patent modulates the RF signal parameters (frequency, amplitude, phase) based on feedback from tissue electrical property measurements. By dynamically changing these parameters, the system optimizes energy delivery to target tissue with different electrical characteristics compared to healthy tissue, achieving selective heating without uniformly heating surrounding areas.
2Productivity
If high temperatures are applied to induce necrosis, then tumor cell destruction is achieved, but healthy tissue deterioration increases
Solution Approach 1:
The feedback mechanism continuously monitors tissue electrical properties and adjusts RF power delivery in real-time. This prevents temperature from rising to levels that would cause necrosis in healthy tissue, while maintaining sufficient temperature in target tissue to induce apoptosis through controlled, sustained heating rather than extreme temperature spikes.
Solution Approach 2:
By modulating RF signal parameters based on tissue feedback, the system maintains temperature within a therapeutic window that promotes apoptosis in tumor cells (typically 40-45°C) without reaching necrotic temperatures (>60°C) that would damage healthy tissue.
3Device complexity
If RF signal is applied without modulation, then energy delivery is simple, but selectivity for target tissue is insufficient
Solution Approach 1:
The sensor measures electrical properties (such as impedance, conductivity, or permittivity) of the target tissue and feeds this information back to the modulation signal generator. This feedback loop enables the system to distinguish target tissue from healthy tissue based on their different electrical characteristics and adjust the RF signal accordingly to achieve selective heating.
Solution Approach 2:
The modulation signal generator changes RF signal parameters (frequency, amplitude, phase) based on measured tissue electrical properties. This dynamic parameter adjustment creates a selective heating effect by matching the RF signal characteristics to the electrical properties of target tissue, thereby improving targeting accuracy despite increased system 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 device achieves selective heating of target tissues, minimizing damage to healthy tissues and inducing apoptosis, thereby improving treatment efficacy for cancer and pain management while reducing side effects.
Implementation Method 1
the target tissue is heated by Joule heat (Q=I2R) generated by conversion of the current flow through the target tissue into heat
Implementation Method 2
The target tissue such as a malignant tumor tissue has a higher complex or overall conductivity (admittance) than healthy tissue and consequently has a higher absorption rate of the current going through it
Implementation Method 3
the feedback signal (5) modulates the source signal (8) to generate a target modified modulated signal (4)
Data Source
AI summary
The present invention relates to a radiofrequency (RF) hyperthermia device for capacitive coupling comprising a radiofrequency source, an amplifier, a sensor, a feedback amplifier and a modulation signal generator, wherein the radiofrequency source produces a source signal which is modulated by the modulation signal generator, amplified by the amplifier and directed to a target, the sensor receives a feed back signal from the target that is directed to the feed back amplifier, wherein the feedback signal is amplified by the feedback amplifier and modulates the source signal to generate a target modified signal. This radiofrequency (RF) hyperthermia device is designed for increasing the selectivity of the hyperthermia treatment.