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Methods for Tattooing Xenopus laevis with a Rotary Tattoo Machine
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Ultrasound internal tattooing.

Olivier Couture1, Magalie Faivre, Nicolas Pannacci

  • 1ESPCI, Paris 75005, France. olivier.couture@espci.fr

Medical Physics
|April 2, 2011
PubMed
Summary

Researchers developed ultrasound-inducible droplets for precise, noninvasive internal tattooing of tissues. This method allows surgeons to remotely deposit fluorescent markers for improved surgical target identification.

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Area of Science:

  • Biomedical Engineering
  • Medical Imaging
  • Nanotechnology

Background:

  • Accurate preoperative identification of surgical targets is crucial for effective resection.
  • Current methods for tissue marking can be invasive or lack precise control.
  • Novel image-guided techniques are needed for noninvasive internal tattooing.

Purpose of the Study:

  • To develop and demonstrate a method for selective, noninvasive, and image-guided deposition of markers for internal tattooing.
  • To create ultrasound-inducible droplets capable of carrying substantial fluorescent marker payloads.
  • To achieve remote and controlled deposition of these markers using focused ultrasound.

Main Methods:

  • Monodispersed multiple emulsion droplets (fluorescein in perfluorocarbon in water) were produced using microfluidics.
  • Droplets were designed to be remotely triggered by focused ultrasound (5 MHz imaging pulses).
  • In vitro and in vivo experiments were conducted using chicken eggs and embryos to validate marker deposition.

Main Results:

  • Droplets vaporized at 1.4 MPa peak-negative pressure, ejecting their fluorescent contents.
  • A stable, brightly fluorescent spot (0.5 mm diameter) was observed at the ultrasound focus.
  • The deposited markers were easily visible to the naked eye in vivo.

Conclusions:

  • Ultrasound-inducible multiple emulsions offer a promising platform for in vivo marker delivery.
  • This technology enables precise, remote internal tattooing under ultrasound guidance.
  • Potential applications include delivery of contrast agents, chemotherapy, and genetic materials using conventional ultrasound scanners.