Ultrasonic Therapy System Microbubble Delivery Control
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Solution Overview
Problem
Current ultrasonic therapeutic systems face challenges in effectively delivering pharmacological and therapeutic compounds to specific regions of the body, with limitations in controlling ultrasound intensity and microbubble concentration, leading to suboptimal drug delivery and treatment efficacy.
Innovation Solution
An ultrasonic therapy system that combines controlled ultrasound delivery with microbubbles, using metrics such as ultrasound intensity, periodicity, and microbubble concentration to optimize drug uptake, featuring adjustable parameters and imaging capabilities for precise targeting and real-time feedback control, ensuring effective therapy by maintaining optimal therapeutic indices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ultrasound intensity is increased to enhance drug delivery effectiveness, then therapeutic outcome is improved, but premature microbubble destruction in non-target regions occurs
Solution Approach 1:
The system applies different ultrasound intensity levels to different spatial regions: high intensity is focused on the target region to ensure microbubble destruction and drug delivery, while low intensity is applied to non-target regions to prevent premature destruction. This spatial differentiation of ultrasound intensity resolves the contradiction between achieving therapeutic effectiveness and avoiding premature microbubble destruction.
Solution Approach 2:
The ultrasound delivery system employs periodic pulsing with specific duty cycles, delivering ultrasound in controlled bursts rather than continuous exposure. This periodic action allows microbubbles to be destroyed at the target site during high-intensity pulses while providing recovery periods that prevent cumulative damage in non-target regions, thereby maintaining therapeutic effectiveness without premature destruction.
2Reliability
If microbubble concentration is increased to improve drug delivery, then therapeutic effectiveness is enhanced, but system complexity and control difficulty increase
Solution Approach 1:
The system incorporates real-time monitoring of microbubble concentration through ultrasound imaging and implements feedback control mechanisms. The control system automatically adjusts ultrasound delivery parameters based on detected microbubble concentration levels, maintaining optimal therapeutic effectiveness without requiring manual intervention or complex external control systems.
Solution Approach 2:
The system utilizes the intrinsic properties of microbubbles to provide self-monitoring capability. Microbubbles naturally produce strong ultrasound echoes and harmonic signals that enable the system to automatically detect and quantify their concentration without requiring separate sensing devices or complex external monitoring equipment.
3Productivity
If ultrasound frequency is optimized for microbubble destruction, then drug delivery effectiveness improves, but selectivity for target region decreases
Solution Approach 1:
The ultrasound delivery is segmented into multiple focused beams or scan lines, each independently controlled to destroy microbubbles only in specific target regions. By dividing the ultrasound field into discrete focal zones, the system achieves high-frequency optimization for destruction in target areas while preserving microbubbles in non-target regions, thereby maintaining both effectiveness and selectivity.
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
Enhances the effectiveness of drug delivery by precisely controlling ultrasound and microbubble concentration, improving the therapeutic outcome by ensuring adequate microbubble destruction at the target site while minimizing premature destruction in other areas, thus optimizing the delivery of therapeutic compounds.
Implementation Method 1
sonoporation, which uses ultrasound to cavitate microbubbles and thereby disrupt the cell plasma membrane
Implementation Method 2
Recently the same principles have been applied at similar energy levels but different pulse lengths to mechanically destroy pathological tissue, a procedure known as histotripsy
Implementation Method 3
HIFU (high intensity focused ultrasound) is in clinical use today to ablate tissue by ultrasonic heating
Implementation Method 4
Sometimes this is done in conjunction with drug therapy, as with tPa in the treatment of stroke. It is also known to be mediated with an application of microbubbles. The microbubbles are agitated or destroyed to physically break up a thrombus
Data Source
AI summary
An ultrasonic therapy system delivers ultrasonic therapy energy to a therapy site in the body which is infused with microbubbles. A system without an image guidance capability has an array transducer which delivers therapy energy, a therapy transducer driver which causes the array transducer to deliver therapeutic energy, a control for controlling the intensity of the therapeutic energy, and a display of the sonotherapy signal strength of the energy and the concentration of microbubbles at the therapy site. A system with ultrasonic imaging capability will display an ultrasound image for therapeutic guidance and a measure of the microbubble concentration. The method of the present invention is performed as an adjunct to a standard drug therapy or other treatment regimen, following such treatment with an infusion of ultrasound and delivery of ultrasound therapy energy.