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BioImplantable Bone Stress Sensor.

J Fernando Alfaro1, Lee Weiss, Phil Campbell

  • 1The Robotics Institute, Duquesne University. Pittsburgh, Pennsylvania 15282.

Conference Proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference
|February 7, 2007
PubMed
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This study introduces a novel MicroElectroMechanical System (MEMS) sensor for directly measuring bone strength in situ. This technology offers a safe and precise method for assessing bone quality at a micro-level scale.

Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Orthopedics

Background:

  • Clinical management of skeletal issues relies on radiographic imaging, which has limitations in accurately assessing bone strength.
  • Current methods for evaluating bone quality in situ are insufficient, necessitating safer and more convenient alternatives.

Purpose of the Study:

  • To present a new MicroElectroMechanical System (MEMS) based technique for direct, in situ measurement of bone strength at a micro-level.
  • To develop a sensor capable of detecting normal and shear stress at the bone-sensor interface.

Main Methods:

  • Development of a MEMS stress sensor with an array of piezoresistive sensor pixels.
  • Integration of the sensor onto a textured surface designed for bone integration and cell growth.

Related Experiment Videos

  • Utilizing finite element analysis for sensor design optimization to detect normal and shear stresses.

    • Main Results:

    • The MEMS sensor achieves stress detection resolution down to 100 Pa with 1-second averaging.
    • Surface topography with 30-60 μm features was identified as optimal for cell growth and sensor integration.
    • The sensor design effectively addresses both normal and shear stress detection.

    Conclusions:

    • The developed MEMS sensor provides a direct and precise method for measuring bone strength in situ.
    • This technology has the potential to improve the clinical management of skeletal trauma and disease by offering a more accurate assessment of bone quality.
    • The sensor's design considers bone integration and biocompatibility, paving the way for future in vivo applications.