Ultrasound nucleolysis: an in vitro study

Area of Science:

• Biomedical Engineering
• Medical Physics
• Orthopedics

Background:

• Chronic low back pain is a prevalent condition often treated with invasive procedures.
• Thermal intradiscal therapy using catheters is an emerging treatment option.
• Investigating noninvasive heating methods for the intervertebral disc is crucial for advancing treatment options.

Purpose of the Study:

• To explore the feasibility of using high-intensity focused ultrasound (HIFU) to heat the nucleus pulposus of the intervertebral disc.
• To evaluate both invasive and noninvasive HIFU transducer approaches for thermal disc treatment.
• To determine optimal HIFU parameters for targeted thermal therapy.

Main Methods:

• Theoretical simulations were conducted to optimize ultrasound (US) transducer parameters.
• Experimental studies utilized custom-made transducers based on simulation results.
• Temperature distribution was analyzed using both single and dual orthogonal transducer configurations.

Main Results:

• Experiments confirmed that HIFU can successfully heat intervertebral discs.
• Using two orthogonal transducers yielded a more uniform and effective temperature distribution compared to a single transducer.
• Noninvasive HIFU demonstrated the potential for targeted thermal treatment of the nucleus pulposus.

Conclusions:

• High-intensity focused ultrasound is a feasible method for thermal treatment of the nucleus pulposus.
• Noninvasive HIFU offers a promising alternative for treating chronic low back pain.
• Dual orthogonal transducer arrangements enhance the efficacy of HIFU thermal therapy for intervertebral discs.