Histotripsy Cavitation Targeting for Precise Tissue Ablation
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Solution Overview
Problem
Existing medical procedures often require invasive surgical interventions, which involve trauma, scarring, and risks of infection, while non-invasive and minimally invasive methods lack precision and safety for treating various diseases.
Innovation Solution
Histotripsy systems utilize short, intense bursts of acoustic energy to induce controlled cavitation, mechanically homogenizing tissue without thermal energy, allowing precise and controlled tissue destruction visible on ultrasound imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If invasive surgical interventions are used, then treatment efficacy is improved, but patient trauma and risk of infection increase
Solution Approach 1:
The patent replaces mechanical surgical instruments with acoustic energy (ultrasound waves) to achieve tissue ablation. The histotripsy system uses focused acoustic pulses to generate cavitation bubbles that mechanically disrupt tissue at the focal point, eliminating the need for physical incisions and surgical tools while maintaining treatment efficacy.
Solution Approach 2:
The patent utilizes the phase transition of water in tissue from liquid to vapor through acoustic cavitation. The intense acoustic pressure causes water molecules to form and collapse vapor bubbles, generating mechanical forces that fragment tissue. This phase transition mechanism enables non-contact tissue destruction without thermal damage or physical incisions.
2Object-affected harmful factors
If non-invasive procedures are used, then patient trauma is reduced, but treatment precision and safety decrease
Solution Approach 1:
The patent segments the treatment process into distinct phases: imaging/planning, test pulsing for threshold determination, and treatment delivery. The system divides the tissue target into discrete treatment zones that can be addressed sequentially with precise acoustic focusing, enabling non-invasive treatment with high spatial precision.
Solution Approach 2:
The patent implements feedback control by using ultrasound imaging to monitor tissue response in real-time and by conducting test pulses to determine cavitation thresholds before treatment. The system adjusts acoustic parameters based on observed tissue effects, ensuring precise energy delivery and preventing damage to surrounding healthy tissue.
3Reliability
If thermal energy is used for tissue ablation, then treatment efficacy is improved, but thermal damage to surrounding tissue occurs
Solution Approach 1:
The patent replaces thermal energy with acoustic-mechanical energy for tissue ablation. The histotripsy system uses focused ultrasound waves to generate cavitation bubbles whose collapse produces mechanical shear forces that fragment tissue. This mechanical mechanism achieves effective tissue destruction without the thermal diffusion that causes damage to surrounding healthy tissue.
Solution Approach 2:
The patent employs periodic acoustic pulsing with specific duty cycles to deliver treatment energy. The system uses short bursts of acoustic energy followed by intervals, allowing the tissue to respond and preventing cumulative thermal effects while maintaining effective mechanical cavitation for tissue ablation.
4Reliability
If high amplitude acoustic pulses are used, then cavitation effectiveness is improved, but risk of uncontrolled tissue damage increases
Solution Approach 1:
The patent performs preliminary test pulsing to determine the cavitation threshold for the specific tissue target before delivering full treatment. The system conducts low-amplitude test pulses to identify the minimum acoustic pressure required to generate cavitation, then uses this information to set appropriate treatment amplitudes that are effective yet controlled.
Solution Approach 2:
The patent dynamically adjusts acoustic parameters including amplitude, pulse duration, and repetition frequency based on real-time tissue response. The system modifies delivery parameters during treatment to optimize cavitation effectiveness while preventing damage to surrounding healthy tissue, adapting to variations in tissue properties and treatment progress.
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
Provides non-invasive and minimally invasive tissue treatment with precise lesion creation, avoiding thermal damage and enabling real-time imaging confirmation of treatment efficacy.
Implementation Method 1
Histotripsy, or pulsed ultrasound cavitation therapy, is a technology where extremely short, intense bursts of acoustic energy induce controlled cavitation (microbubble formation) within the focal volume
Implementation Method 2
The vigorous expansion and collapse of these microbubbles mechanically homogenizes cells and tissue structures within the focal volume
Data Source
AI summary
A histotripsy therapy system configured for the treatment of tissue is provided, which may include any number of features. Provided herein are systems and methods that provide efficacious non-invasive and minimally invasive therapeutic, diagnostic and research procedures. In particular, provided herein are optimized systems and methods that provide targeted, efficacious histotripsy in a variety of different regions and under a variety of different conditions without causing undesired tissue damage to intervening/non-target tissues or structures.