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Related Experiment Videos

A bone tissue integrated single fibre laser Doppler flowmeter probe.

E G Salerud1, S Hellem

  • 1Department of Biomedical Engineering, University Hospital, Linköping University, Sweden.

EXS
|January 1, 1992
PubMed
Summary

Laser Doppler Flowmetry (LDF) measures superficial blood flow but shows variability. Single fiber LDF with titanium probes offers new ways to study deep tissue perfusion and healing.

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Assessment of pigmented skin lesions in terms of blood perfusion estimates.

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Area of Science:

  • Biomedical Engineering
  • Physiology
  • Microcirculation Research

Background:

  • Laser Doppler Flowmetry (LDF) is primarily used for superficial tissue blood flow measurement.
  • Existing LDF methods exhibit significant variability in superficial tissues and are limited for deep tissue analysis.
  • Vasomotion, a previously microscopic observation, has not been extensively studied with LDF.

Purpose of the Study:

  • To evaluate the capabilities of Laser Doppler Flowmetry (LDF) for both superficial and deep tissue blood flow measurement.
  • To investigate the potential of single fiber LDF (SFLDF) with implantable probes for long-term studies.
  • To assess the impact of implantable probes on tissue perfusion and healing, particularly in bone.

Main Methods:

  • Evaluation of LDF for superficial skin blood flow, noting variability.

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  • Development and testing of an in vivo model for quantitative LDF calibration.
  • Utilizing single fiber LDF (SFLDF) with implantable, biocompatible titanium probes in bone tissue.

    • Main Results:

    • LDF showed high variation coefficients in superficial skin perfusion.
    • A linear relationship between LDF signal and blood flow (0-300 ml min-1 100 g-1) was established, though tissue-specific.
    • SFLDF with titanium probes demonstrated minimal initial trauma in cortical bone and enhanced perfusion during healing, suggesting angiogenesis.

    Conclusions:

    • SFLDF with tissue-integrated titanium probes is promising for deep tissue physiology and trauma studies.
    • The healing process around probes can influence perfusion measurements, favoring minimally invasive designs.
    • Further modifications could adapt the integrated probe technique for various tissue types beyond bone.