Multi-modal transducer-waveguide construct coupled to a medical needle.

Area of Science:

• Biomedical Engineering
• Medical Devices
• Acoustic Technology

Background:

• Medical needles are widely used but have limited functionality.
• Current needle applications primarily involve cutting and material transfer.
• Integrating ultrasound offers potential for improved performance and new applications.

Purpose of the Study:

• To develop a waveguide construct for converting ultrasonic waves for medical needle application.
• To maintain high electric-to-acoustic power efficiency in the system.
• To enable enhanced functionalities for medical needles.

Main Methods:

• In silico optimization of the waveguide structure using finite element method.
• Prototyping the developed waveguide construct.
• Experimental characterization of the needle's performance.

Main Results:

• Achieved a 30 kHz flexural needle tip displacement up to 200 μm.
• Demonstrated 73% electric-to-acoustic power efficiency.
• Operated effectively at low power consumption (under 5 W).

Conclusions:

• The developed waveguide enables ultrasonic medical needles with enhanced precision and reduced insertion force.
• The system's high efficiency and low power consumption facilitate portable and safe designs.
• Potential applications include biopsy, drug/gene delivery, and minimally invasive interventions.