Microbubble Spectral Safety Marker for Ultrasound Cavitation Control
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Solution Overview
Problem
Current methods for delivering therapeutic molecules to specific biological tissues, such as the brain, face challenges in ensuring safe and effective delivery due to the blood-brain barrier, with existing cavitation markers lacking sensitivity and reliability, and the risk of inertial cavitation causing tissue damage.
Innovation Solution
A method and system for spectral analysis that measures subharmonic and ultra-harmonic frequencies of microbubbles during ultrasound therapy to determine a safety marker, using a passive cavitation detector and a command and control device to adjust ultrasonic parameters in real time, preventing destabilization of microbubbles and ensuring safe treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional safety markers are used to monitor cavitation dose, then the treatment can proceed, but the sensitivity and robustness are insufficient leading to potential tissue damage
Solution Approach 1:
The patent replaces conventional mechanical/physical safety monitoring with acoustic emission spectroscopy. By listening to the acoustic fingerprints emitted by microbubbles during cavitation, the system substitutes direct physical measurement with acoustic signal analysis, enabling more sensitive and reliable detection of cavitation regimes to prevent tissue damage.
Solution Approach 2:
The patent introduces acoustic emissions as an intermediary indicator between the cavitation process and tissue damage. Instead of directly measuring tissue state, the system uses acoustic signals from microbubbles as a mediator to infer cavitation dose and predict potential harm, enabling earlier and more reliable safety assessment.
2Productivity
If high acoustic pressure is applied to ensure effective cavitation dose, then treatment effectiveness improves, but inertial cavitation increases causing tissue deterioration
Solution Approach 1:
The patent implements real-time feedback control by continuously monitoring acoustic emissions during ultrasound treatment. The spectral analysis of acoustic signals provides immediate feedback on cavitation regime, allowing dynamic adjustment of acoustic pressure to maintain stable cavitation effectiveness while preventing transition to harmful inertial cavitation that causes tissue deterioration.
Solution Approach 2:
The patent transforms static safety monitoring into a dynamic control system. By analyzing temporal variations in acoustic emission spectra throughout the treatment, the system adapts to changing cavitation conditions in real-time, enabling effective treatment delivery while dynamically preventing tissue damage through continuous regime assessment.
3Area of stationary object
If skull thickness varies in non-uniform structures, then treatment coverage is improved, but ultrasound beam attenuation varies causing non-uniform cavitation dose
Solution Approach 1:
The patent enables the system to self-correct for skull thickness variations through acoustic emission monitoring. The acoustic fingerprints provide real-time information about actual cavitation dose received by microbubbles in different regions, allowing the system to automatically compensate for non-uniform beam attenuation caused by variable skull thickness without external intervention.
Solution Approach 2:
The patent uses spectral parameter analysis of acoustic emissions to detect and compensate for dose non-uniformity. By monitoring changes in acoustic frequency spectra and temporal patterns, the system identifies regions receiving insufficient or excessive dose due to skull variations and adjusts treatment parameters to achieve uniform cavitation effect across the entire treatment area.
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 method provides a more sensitive and reliable safety marker for controlling cavitation, reducing the risk of tissue damage by dynamically adjusting ultrasound parameters, ensuring effective and safe delivery of therapeutic molecules.
Implementation Method 1
the mechanical forces (i.e., micro-flows and oscillations) resulting from the bubble-ultrasound interactions (cavitation) weaken the barrier
Implementation Method 2
The acoustic pressure within the treated tissue must be sufficient to cause a controlled oscillation of the microbubbles (stable cavitation regime)
Implementation Method 3
subjected to excessively high acoustic pressures, the microbubbles then enter into an inertial cavitation regime involving locally violent physical effects
Implementation Method 4
the attenuation of the ultrasound beam is correspondingly modified. The amplitude of the ultrasonic wave may easily vary by a factor of 2 from one point to another in humans
Data Source
AI summary
A method for performing spectral analysis and determining a safety marker includes an assembly via which: regularly, during shot Bb, at a series of times ta, the variation as a function of time in the spectral lines corresponding to the subharmonic and ultra-harmonic frequencies of a received acoustic-response signal of the microbubbles is measured, and the variation as a function of time, over the times ta, in a safety marker is determined and quantified, the safety marker being defined, at each time ta, by a number MDDa equal to the ratio of the sum of the areas of the spectral lines, measured at the time ta and corresponding to the subharmonic and/or ultra-harmonic frequencies of the received acoustic-response signal of the microbubbles, to the sum of the areas of the spectral lines, measured at the first time t1 and corresponding to the subharmonic and/or ultra-harmonic frequencies of the acoustic-response signal of the microbubbles. A system for performing spectral analysis and determining a safety marker implements said method.