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Ultrasonography01:17

Ultrasonography

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Ultrasonography is an imaging technique that uses high-frequency sound waves to visualize the body's internal structures. It is a non-invasive and safe procedure that does not involve the use of ionizing radiation, making it widely used in various medical fields. Ultrasonography is used to study heart function, blood flow in the neck or extremities, certain conditions such as gallbladder disease, and fetal growth and development.
During an ultrasonography procedure, a handheld device called...
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Related Experiment Video

Updated: Jul 10, 2025

Three-Dimensional Ultrasonic Needle Tip Tracking with a Fiber-Optic Ultrasound Receiver
04:33

Three-Dimensional Ultrasonic Needle Tip Tracking with a Fiber-Optic Ultrasound Receiver

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

Yohann Le Bourlout1, Gösta Ehnholm1, Heikki J Nieminen1

  • 1Medical Ultrasonics Laboratory (MEDUSA), Department of Neuroscience and Biomedical Engineering, Aalto University, Rakentajanaukio 2, Espoo, 02150, Finland.

The Journal of the Acoustical Society of America
|November 22, 2023
PubMed
Summary

Researchers developed an ultrasonic medical needle using a novel waveguide. This innovation enhances precision and reduces force for procedures like biopsies and drug delivery.

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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.